Bump version to v10.2

Release/v9.0

.gitignore

@@ -13,8 +13,9 @@ data_*/
 mono_crash.*.json
 
 # Builds
+*.x86_64
+godot.*.template_release.*
 dist/*
-!dist/.gitkeep
 
 screenshot.png.import
 

LICENSE

@@ -1,21 +1,28 @@
-MIT License
+BSD 3-Clause License
 
-Copyright (c) 2024 Julian Müller (ChaoticByte)
+Copyright (c) 2025, Julian Müller (ChaoticByte)
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

@@ -1,39 +1,156 @@
 
-<h1 align=center>GlitchApp</h1>
+<h1 align=center>Fragmented</h1>
 
 ![screenshot](./screenshot.png)
 
-<p align=center>Create image filters by writing shaders.</p>
+<p align=center>An image editing/compositing software for graphics programmers.</p>
+
+## Table of Contents
+
+- [Supported Platforms](#supported-platforms)
+- [Usage](#usage)
+- [Shaderlib](#shaderlib)
+- [Commandline interface](#commandline-interface)
+- [Known Issues](#known-issues)
 
 ## Supported Platforms
 
-- Linux [tested]
-- Windows
+- Linux
 
-You can find the latest releases [here](https://github.com/ChaoticByte/GlitchApp/releases/latest).
+You can find the latest releases [here](https://github.com/ChaoticByte/Fragmented/releases/latest).
 
 ## Usage
 
-The application includes presets. You can use them as a starting-point to write your own filters.  
-Just load an image, apply a preset, edit the code and hit `F5` to see the changes.
+With Fragemented, you are processing images with GDShaders. This brings almost endless opportunities to create unique art.  
+If you want to learn GDShader, take a look at the [Godot docs](https://docs.godotengine.org/en/stable/tutorials/shaders/).
 
-### Load additional images using the `//!load` directive
+**The builtin editor got removed** from Fragmented with version **v9.0**. I advise you to write your shaders directly in the Godot Editor.
+
+**To get started, use the project template (see the Releases section of this repo) and open it in Godot.**
+
+The template includes many examples. You can use them as a starting-point to write your own stuff.
+
+Besides the regular GDShader stuff, Fragmented has so-called directives. Those allow to further control the behaviour of the application. **The most important directive is `//!load` to load an image.**
+
+### Load TEXTURE using the `//!load` directive
 
 ```glsl
-//!load <name> <filepath>
+//!load <filepath>
+```
+
+The main image file will be read and available as the sampler2D `TEXTURE`.
+
+#### Load additional images
+
+```glsl
+//!load+ <name> <filepath>
+
 uniform sampler2D <name>;
 ```
 
-With this you can load additional images into your shader.  
-Have a look at the `Mix` preset:
+Have a look at the `place_texture.gdshader` example.
+
+### Have multiple steps with `//!steps n`
+
+You can apply your shaderfile multiple times. At every additional step, `TEXTURE` is the result of the previous step. This can be used to chain effects that cannot be easily chained otherwise.
+
+To query the current step index, a `STEP` uniform is automatically injected. If `steps` is set to `0`, your shader won't be applied at all.
+
+Example:
+
+```glsl
+//!load ...
+//!steps 5
+
+uniform int STEP;
+uniform int STEPS;
+
+void fragment() {
+  if (STEP == 0) {
+	  ...
+  } else if (STEP == 1) {
+	  ...
+  } else if (STEP == STEPS-1) {
+    ...
+  }
+}
+```
+
+## Shaderlib
+
+This repo comes with a (still small) shader library including pre-written functions and more.  
+Have a look at the `shaderlib` folder.
+
+Here is an example:
 
 ```glsl
 shader_type canvas_item;
 
-//!load img2 ./icon.png
-uniform sampler2D img2: repeat_enable, filter_nearest;
+#include "./shaderlib/oklab.gdshaderinc"
+
+//!load ./images/swamp.jpg
 
 void fragment() {
-	COLOR = mix(COLOR, texture(img2, UV), .5);
+	vec4 oklab = rgb2oklab(COLOR);
+	vec4 oklch = oklab2oklch(oklab);
+	oklch.z -= 2.0;
+	COLOR = oklab2rgb(oklch2oklab(oklch));
 }
 ```
+
+## Commandline interface
+
+You can run Fragmented from the commandline or scripts.
+
+> Note: Headless mode is not supported. Using the commandline interface still opens a window.
+
+### Usage
+
+```
+~ Fragmented CLI ~
+-================-
+
+Usage:
+
+./Fragmented <command> <args...>
+
+Commands:
+
+ help
+
+  | Shows this help text.
+
+ apply --shader PATH [--load-image PATH]
+
+  | Applies a shader file.
+
+    --shader PATH      The path to the shader
+    --output PATH      Where to write the resulting image to.
+                       In batch mode, this must be a folder.
+    --load-image PATH  The path to the image. This will overwrite the
+                       load directive of the shader file.
+                       Passing a folder activates batch mode.
+                       (optional)
+
+```
+
+### Batch Mode
+
+Since version v8.0, you can pass a directory to `--load-image` and `--output`. This will process all images in the input directory and write the output to the output directory.
+
+> Note: You *can* use this feature for video frames, but it will take a loooong time.
+
+#### Examples
+
+```
+./Fragmented apply --shader ./examples/oklab.gdshader --output ./output.png
+```
+
+```
+./Fragmented apply --shader ./examples/oklab.gdshader --load-image ~/Pictures/test.png --output ./output.png
+```
+
+## Known Issues
+
+- screen scaling is unsupported; Using screen scaling could lead to an either blurry UI, or no scaling at all -> see #45
+- commandline interface: `--headless` is not supported

build-template/Containerfile

@@ -0,0 +1,20 @@
+
+MAINTAINER ChaoticByte
+
+# Using Ubuntu 20.04
+FROM docker.io/ubuntu:focal AS os-base
+
+# https://docs.godotengine.org/en/stable/contributing/development/compiling/compiling_for_linuxbsd.html
+
+RUN apt-get update
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq python3-pip git build-essential pkg-config libx11-dev libxcursor-dev libxinerama-dev libgl1-mesa-dev libglu1-mesa-dev libasound2-dev libpulse-dev libudev-dev libxi-dev libxrandr-dev libwayland-dev
+RUN pip3 install --system scons
+
+FROM os-base AS clone-src
+
+RUN git clone https://github.com/godotengine/godot.git -b 4.4-stable /godot-src
+
+FROM clone-src
+
+WORKDIR /godot-src
+ENTRYPOINT scons platform=linuxbsd target=template_release lto=full optimize=size disable_3d=yes module_text_server_adv_enabled=no module_text_server_fb_enabled=yes module_basis_universal_enabled=no module_csg_enabled=no module_enet_enabled=no module_gridmap_enabled=no module_jsonrpc_enabled=no module_mbedtls_enabled=no module_meshoptimizer_enabled=no module_minimp3_enabled=no module_mobile_vr_enabled=no module_msdfgen_enabled=no module_multiplayer_enabled=no module_navigation_enabled=no module_ogg_enabled=no module_openxr_enabled=no module_raycast_enabled=no module_squish_enabled=no module_theora_enabled=no module_upnp_enabled=no module_vhacd_enabled=no module_vorbis_enabled=no module_webrtc_enabled=no module_websocket_enabled=no module_webxr_enabled=no arch=x86_64 && strip bin/godot.linuxbsd.template_release.x86_64

build-template/build.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -e
+
+function log {
+    echo -e "\033[1;36m***** $@ *****\033[0m"
+}
+
+log "                                         "
+log "Fragmented - Godot Build Template Builder"
+log "                                         "
+
+cd $(dirname $0)
+log Switched to $(pwd)
+
+tmpsuffix=$(date +%s%N)
+image_name=fragmented-godot-template-builder
+container_name=${image_name}-${tmpsuffix}
+output_file=godot.linuxbsd.template_release.x86_64
+
+log Building image ${image_name} ...
+buildah build -t ${image_name}
+log Building godot build template with container ${container_name} ...
+podman run --name ${container_name} localhost/${image_name}:latest
+log Copying ${output_file} from container to $(realpath ./${output_file})
+podman cp ${container_name}:/godot-src/bin/${output_file} ./${output_file}
+log Removing container ${container_name}
+podman container rm ${container_name}
+log Done :D

dist.sh

@@ -0,0 +1,30 @@
+set -e
+
+function log {
+    echo -e "\033[1;36m***** $@ *****\033[0m"
+}
+
+mkdir -p dist
+
+log Building application
+
+VERSION="$(godot --headless --no-header -s tools/get_version.gd)"
+
+godot --headless --export-release "Linux/X11" "dist/Fragmented-${VERSION}.x86_64"
+
+log Packing shaderlib
+
+ZIP_PATH_SHADERLIB=$(realpath "dist/Fragmented-${VERSION}_shaderlib.zip")
+
+zip -r "${ZIP_PATH_SHADERLIB}" shaderlib/
+
+log Packing project template
+
+ZIP_PATH_PROJECT_TEMPLATE=$(realpath "dist/Fragmented-${VERSION}_project_template.zip")
+
+rm -f "${ZIP_PATH_PROJECT_TEMPLATE}"
+(
+    cd examples/
+    mv project.godot_ project.godot && trap "mv project.godot project.godot_" EXIT
+    zip -r "${ZIP_PATH_PROJECT_TEMPLATE}" *
+)

examples/0_empty.tscn

@@ -0,0 +1,3 @@
+[gd_scene format=3 uid="uid://db2rhq8rwv5wo"]
+
+[node name="Node" type="Node"]

examples/blur.gdshader

@@ -0,0 +1,8 @@
+shader_type canvas_item;
+
+//!load ./images/swamp.jpg
+#include "./shaderlib/blur.gdshaderinc"
+
+void fragment() {
+	COLOR = gaussian_blur(TEXTURE, UV, 48, 24.0);
+}

examples/blur.gdshader.uid

@@ -0,0 +1 @@
+uid://cny8dtukv54wt

examples/channel_offset.gdshader

@@ -1,5 +1,7 @@
 shader_type canvas_item;
 
+//!load ./images/swamp.jpg
+
 const vec2 offset_r = vec2(-0.002, -0.002);
 const vec2 offset_g = vec2(0., 0.);
 const vec2 offset_b = vec2(0.002, 0.002);

examples/channel_offset.gdshader.uid

@@ -0,0 +1 @@
+uid://0efk4fornlg6

examples/color_and_pixelate.gdshader

@@ -0,0 +1,14 @@
+shader_type canvas_item;
+
+#include "./shaderlib/hsv.gdshaderinc"
+#include "./shaderlib/pixelate.gdshaderinc"
+
+//!load ./images/swamp.jpg
+
+void fragment() {
+	COLOR = pixelate(TEXTURE, UV, 200.0);
+	vec4 hsv = rgb2hsv(COLOR);
+	hsv.xyz += vec3(0.65, .42-(hsv.y*.3), -.125);
+	hsv.xyz *= vec3(1.0, 1.0, 1.25);
+	COLOR = hsv2rgb(hsv);
+}

examples/color_and_pixelate.gdshader.uid

@@ -0,0 +1 @@
+uid://gd23hu7ro148

examples/denoise.gdshader

@@ -0,0 +1,9 @@
+shader_type canvas_item;
+
+//!load ./images/noisy.png
+
+#include "./shaderlib/denoise.gdshaderinc"
+
+void fragment() {
+	COLOR = smart_denoise(TEXTURE, UV, 12.0, 1.0, .12);
+}

examples/denoise.gdshader.uid

@@ -0,0 +1 @@
+uid://cbwyneu03fki6

examples/greyscale.gdshader

@@ -1,10 +1,10 @@
 shader_type canvas_item;
 
+//!load ./images/swamp.jpg
+
 void fragment() {
-	vec4 tex = texture(TEXTURE , UV);
 	float b = (COLOR.r + COLOR.g + COLOR.b) / 3.0;
 	COLOR.r = b;
 	COLOR.g = b;
 	COLOR.b = b;
-	COLOR.a = tex.a;
 }

examples/greyscale.gdshader.uid

@@ -0,0 +1 @@
+uid://dvarqolt6es27

examples/images/CREDITS.md

@@ -0,0 +1,6 @@
+
+# Example Images
+
+- swamp.jpg by [clfr21 on Pixabay](https://pixabay.com/de/users/clfr21-6530007/)
+- grass.png by [GDJ on Pixabay](https://pixabay.com/users/gdj-1086657/)
+- mountain.jpg by [Phghvvcftyyufj on Pixabay](https://pixabay.com/users/phghvvcftyyufj-12646982)

examples/images/grass.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://c1mh1d2f3u4ju"
+path="res://.godot/imported/grass.png-61a458998da568ce60ccb8a0c7caaf6d.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://examples/images/grass.png"
+dest_files=["res://.godot/imported/grass.png-61a458998da568ce60ccb8a0c7caaf6d.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

examples/images/mountain.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ben72llmopgaj"
+path="res://.godot/imported/mountain.jpg-c1b7de1e6557b826bc6f9324027e11af.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://examples/images/mountain.jpg"
+dest_files=["res://.godot/imported/mountain.jpg-c1b7de1e6557b826bc6f9324027e11af.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

examples/images/noisy.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cfe2d0qes5x87"
+path="res://.godot/imported/noisy.png-1b2e79340785c6c0f50d5bad5ce97356.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://examples/images/noisy.png"
+dest_files=["res://.godot/imported/noisy.png-1b2e79340785c6c0f50d5bad5ce97356.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

examples/images/swamp.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ckjb0agn5btv7"
+path="res://.godot/imported/swamp.jpg-1dfdcd52a5ef03d42a82a7f06acefa98.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://examples/images/swamp.jpg"
+dest_files=["res://.godot/imported/swamp.jpg-1dfdcd52a5ef03d42a82a7f06acefa98.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

examples/kuwahara.gdshader

@@ -0,0 +1,16 @@
+shader_type canvas_item;
+
+//!load ./images/mountain.jpg
+
+#include "./shaderlib/kuwahara.gdshaderinc"
+#include "./shaderlib/hsv.gdshaderinc"
+
+void fragment() {
+	// Kuwahara
+	COLOR.rgb = kuwahara(TEXTURE, UV, 20, 80.0, 18.0, 0.6, .15, 8);
+	// A litte bit of color adjustments
+	vec4 hsv = rgb2hsv(COLOR);
+	hsv.x += .03;
+	hsv.y *= 1.4;
+	COLOR = hsv2rgb(hsv);
+}

examples/kuwahara.gdshader.uid

@@ -0,0 +1 @@
+uid://cdhyuk7u8kxyk

examples/lowpass.gdshader

@@ -0,0 +1,13 @@
+shader_type canvas_item;
+
+//!load ./images/swamp.jpg
+
+// Settings
+const float threshold = 0.6;
+//
+
+void fragment() {
+	vec4 tex = texture(TEXTURE , UV);
+	COLOR.rgb = min(tex.rgb, vec3(threshold));
+	COLOR.a = tex.a;
+}

examples/lowpass.gdshader.uid

@@ -0,0 +1 @@
+uid://dn02xsjm1kok8

examples/multistep_distort.gdshader

@@ -0,0 +1,22 @@
+shader_type canvas_item;
+
+//!steps 9
+//!load ./images/swamp.jpg
+
+uniform int STEP;
+
+const float strength = 0.01;
+
+void fragment() {
+	float v;
+	if (STEP % 3 == 0) {
+		v = COLOR.r; // 3 times
+	} else if (STEP % 3 == 0) {
+		v = COLOR.g; // 3 times
+	} else {
+		v = COLOR.b; // 3 times
+	}
+	vec2 uv = UV;
+	uv.y -= v * strength;
+	COLOR = texture(TEXTURE, uv);
+}

examples/multistep_distort.gdshader.uid

@@ -0,0 +1 @@
+uid://c17u5jx7a7o81

examples/multistep_pixelsort.gdshader

@@ -0,0 +1,20 @@
+shader_type canvas_item;
+
+#include "./shaderlib/pixelsort.gdshaderinc"
+
+//!steps 1500
+uniform int STEP;
+
+//!load ./images/mountain.jpg
+
+void fragment() {
+	// pixel sorting works in multiple steps
+	COLOR = pixelsort_step(
+		TEXTURE, UV,
+		DIRECTION_BOTTOM_TO_TOP,
+		COLOR_MODE_OKLCH,
+		{true, false, false},
+		{-INF, .007, -INF},
+		{INF, INF, INF},
+		STEP);
+}

examples/multistep_pixelsort.gdshader.uid

@@ -0,0 +1 @@
+uid://csk0fg4by651b

examples/oklab.gdshader

@@ -0,0 +1,12 @@
+shader_type canvas_item;
+
+#include "./shaderlib/oklab.gdshaderinc"
+
+//!load ./images/swamp.jpg
+
+void fragment() {
+	vec4 oklab = rgb2oklab(COLOR);
+	vec4 oklch = oklab2oklch(oklab);
+	oklch.z -= 2.0;
+	COLOR = oklab2rgb(oklch2oklab(oklch));
+}

examples/oklab.gdshader.uid

@@ -0,0 +1 @@
+uid://cu37y8lc0x83

examples/place_texture.gdshader

@@ -0,0 +1,15 @@
+shader_type canvas_item;
+
+#include "./shaderlib/place_texture.gdshaderinc"
+#include "./shaderlib/common.gdshaderinc"
+
+//!load ./images/swamp.jpg
+//!load+ img2 ./images/grass.png
+
+uniform sampler2D img2: repeat_disable, filter_nearest;
+
+void fragment() {
+	vec4 grass = place_texture(img2, UV, TEXTURE_PIXEL_SIZE, vec2(0, .47), vec2(1));
+	grass.rgb += (vec3(0.02, 0.07, 0.1) - ((UV.y - .8) * 0.15)); // color correction
+	COLOR = alpha_blend(COLOR, grass);
+}

examples/place_texture.gdshader.uid

@@ -0,0 +1 @@
+uid://dybe4t5rbbkc6

examples/project.godot_

@@ -0,0 +1,15 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Fragmented Project"
+run/main_scene="res://0_empty.tscn"
+config/features=PackedStringArray("4.4", "Forward Plus")

examples/shaderlib

@@ -0,0 +1 @@
+../shaderlib

examples/sobel.gdshader

@@ -0,0 +1,10 @@
+shader_type canvas_item;
+
+//!load ./images/noisy.png
+
+#include "./shaderlib/sobel.gdshaderinc"
+
+void fragment() {
+	// Sobel Filter
+	COLOR = sobel(TEXTURE, UV);
+}

examples/sobel.gdshader.uid

@@ -0,0 +1 @@
+uid://h376mk1fq4ky

export_presets.cfg

@@ -1,29 +1,31 @@
 [preset.0]
 
 name="Linux/X11"
-platform="Linux/X11"
+platform="Linux"
 runnable=true
+advanced_options=false
 dedicated_server=false
 custom_features=""
 export_filter="all_resources"
 include_filter=""
-exclude_filter=""
-export_path="dist/GlitchApp.x86_64"
+exclude_filter="screenshot.png, examples/*, shaderlib/*, tools/*, build-template/*"
+export_path="dist/Fragmented.x86_64"
+patches=PackedStringArray()
 encryption_include_filters=""
 encryption_exclude_filters=""
+seed=0
 encrypt_pck=false
 encrypt_directory=false
+script_export_mode=2
 
 [preset.0.options]
 
 custom_template/debug=""
-custom_template/release=""
+custom_template/release="./build-template/godot.linuxbsd.template_release.x86_64"
 debug/export_console_wrapper=1
 binary_format/embed_pck=true
-texture_format/bptc=true
-texture_format/s3tc=true
-texture_format/etc=false
-texture_format/etc2=false
+texture_format/s3tc_bptc=true
+texture_format/etc2_astc=false
 binary_format/architecture="x86_64"
 ssh_remote_deploy/enabled=false
 ssh_remote_deploy/host="user@host_ip"
@@ -37,66 +39,7 @@ unzip -o -q \"{temp_dir}/{archive_name}\" -d \"{temp_dir}\"
 ssh_remote_deploy/cleanup_script="#!/usr/bin/env bash
 kill $(pgrep -x -f \"{temp_dir}/{exe_name} {cmd_args}\")
 rm -rf \"{temp_dir}\""
-
-[preset.1]
-
-name="Windows Desktop"
-platform="Windows Desktop"
-runnable=true
-dedicated_server=false
-custom_features=""
-export_filter="all_resources"
-include_filter=""
-exclude_filter=""
-export_path="dist/GlitchApp.exe"
-encryption_include_filters=""
-encryption_exclude_filters=""
-encrypt_pck=false
-encrypt_directory=false
-
-[preset.1.options]
-
-custom_template/debug=""
-custom_template/release=""
-debug/export_console_wrapper=1
-binary_format/embed_pck=true
 texture_format/bptc=true
 texture_format/s3tc=true
 texture_format/etc=false
 texture_format/etc2=false
-binary_format/architecture="x86_64"
-codesign/enable=false
-codesign/timestamp=true
-codesign/timestamp_server_url=""
-codesign/digest_algorithm=1
-codesign/description=""
-codesign/custom_options=PackedStringArray()
-application/modify_resources=true
-application/icon=""
-application/console_wrapper_icon=""
-application/icon_interpolation=4
-application/file_version=""
-application/product_version=""
-application/company_name=""
-application/product_name="GlitchApp"
-application/file_description=""
-application/copyright="ChaoticByte"
-application/trademarks=""
-application/export_angle=0
-ssh_remote_deploy/enabled=false
-ssh_remote_deploy/host="user@host_ip"
-ssh_remote_deploy/port="22"
-ssh_remote_deploy/extra_args_ssh=""
-ssh_remote_deploy/extra_args_scp=""
-ssh_remote_deploy/run_script="Expand-Archive -LiteralPath '{temp_dir}\\{archive_name}' -DestinationPath '{temp_dir}'
-$action = New-ScheduledTaskAction -Execute '{temp_dir}\\{exe_name}' -Argument '{cmd_args}'
-$trigger = New-ScheduledTaskTrigger -Once -At 00:00
-$settings = New-ScheduledTaskSettingsSet
-$task = New-ScheduledTask -Action $action -Trigger $trigger -Settings $settings
-Register-ScheduledTask godot_remote_debug -InputObject $task -Force:$true
-Start-ScheduledTask -TaskName godot_remote_debug
-while (Get-ScheduledTask -TaskName godot_remote_debug | ? State -eq running) { Start-Sleep -Milliseconds 100 }
-Unregister-ScheduledTask -TaskName godot_remote_debug -Confirm:$false -ErrorAction:SilentlyContinue"
-ssh_remote_deploy/cleanup_script="Stop-ScheduledTask -TaskName godot_remote_debug -ErrorAction:SilentlyContinue
-Unregister-ScheduledTask -TaskName godot_remote_debug -Confirm:$false -ErrorAction:SilentlyContinue
-Remove-Item -Recurse -Force '{temp_dir}'"

project.godot

@@ -10,24 +10,23 @@ config_version=5
 
 [application]
 
-config/name="Glitch"
-config/version="v3.3"
-run/main_scene="res://scenes/main.tscn"
-config/features=PackedStringArray("4.2", "Mobile")
-run/low_processor_mode=true
-config/icon="res://icon.png"
+config/name="Fragmented"
+config/version="v10.2"
+run/main_scene="res://src/scenes/main.tscn"
+config/features=PackedStringArray("4.4", "Mobile")
+config/icon="res://src/assets/icon.png"
 
 [autoload]
 
-ShaderPresets="*res://src/presets/Presets.gd"
-Globals="*res://src/Globals.gd"
+Filesystem="*res://src/Filesystem.gd"
+ShaderDirectiveParser="*res://src/ShaderDirectiveParser.gd"
 
 [display]
 
-window/size/viewport_width=1280
-window/size/viewport_height=720
-window/size/mode=2
+window/size/viewport_width=640
+window/size/viewport_height=672
 window/energy_saving/keep_screen_on=false
+window/subwindows/embed_subwindows=false
 
 [editor_plugins]
 
@@ -38,15 +37,15 @@ enabled=PackedStringArray()
 zoom_out={
 "deadzone": 0.5,
 "events": [Object(InputEventMouseButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"button_mask":16,"position":Vector2(244, 15),"global_position":Vector2(248, 56),"factor":1.0,"button_index":5,"canceled":false,"pressed":true,"double_click":false,"script":null)
-, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":45,"physical_keycode":0,"key_label":0,"unicode":45,"echo":false,"script":null)
-, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194435,"key_label":0,"unicode":45,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":45,"physical_keycode":0,"key_label":0,"unicode":45,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194435,"key_label":0,"unicode":45,"location":0,"echo":false,"script":null)
 ]
 }
 zoom_in={
 "deadzone": 0.5,
 "events": [Object(InputEventMouseButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"button_mask":8,"position":Vector2(270, 19),"global_position":Vector2(274, 60),"factor":1.0,"button_index":4,"canceled":false,"pressed":true,"double_click":false,"script":null)
-, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":43,"physical_keycode":0,"key_label":0,"unicode":43,"echo":false,"script":null)
-, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194437,"key_label":0,"unicode":43,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":43,"physical_keycode":0,"key_label":0,"unicode":43,"location":0,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":true,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194437,"key_label":0,"unicode":43,"location":0,"echo":false,"script":null)
 ]
 }
 drag={
@@ -56,12 +55,12 @@ drag={
 }
 apply_shader={
 "deadzone": 0.5,
-"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194336,"physical_keycode":0,"key_label":0,"unicode":0,"echo":false,"script":null)
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":4194336,"physical_keycode":0,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
 save_shader={
 "deadzone": 0.5,
-"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":true,"meta_pressed":false,"pressed":false,"keycode":83,"physical_keycode":0,"key_label":0,"unicode":115,"echo":false,"script":null)
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":true,"meta_pressed":false,"pressed":false,"keycode":83,"physical_keycode":0,"key_label":0,"unicode":115,"location":0,"echo":false,"script":null)
 ]
 }
 
@@ -70,4 +69,5 @@ save_shader={
 renderer/rendering_method="mobile"
 textures/vram_compression/import_etc2_astc=true
 textures/lossless_compression/force_png=true
-environment/defaults/default_clear_color=Color(0, 0, 0, 1)
+shader_compiler/shader_cache/enabled=false
+environment/defaults/default_clear_color=Color(0.501961, 0.501961, 0.501961, 1)

scenes/main.tscn

@@ -1,254 +0,0 @@
-[gd_scene load_steps=10 format=3 uid="uid://bjah7k4bxo044"]
-
-[ext_resource type="Script" path="res://src/Main.gd" id="1_2625y"]
-[ext_resource type="Script" path="res://src/ImageViewport.gd" id="2_hvo65"]
-[ext_resource type="Script" path="res://src/ImageViewportDisplays.gd" id="3_n4itb"]
-[ext_resource type="Shader" path="res://src/ui_background.gdshader" id="4_ty3qx"]
-[ext_resource type="Script" path="res://src/UIAppVersion.gd" id="5_o1ggv"]
-[ext_resource type="Script" path="res://src/Editor.gd" id="7_g8bap"]
-[ext_resource type="Script" path="res://src/Camera.gd" id="8_mls06"]
-
-[sub_resource type="ViewportTexture" id="ViewportTexture_lct1c"]
-viewport_path = NodePath("ImageViewport")
-
-[sub_resource type="ShaderMaterial" id="ShaderMaterial_onhxk"]
-shader = ExtResource("4_ty3qx")
-
-[node name="Main" type="Node2D"]
-script = ExtResource("1_2625y")
-
-[node name="ImageViewport" type="SubViewport" parent="."]
-disable_3d = true
-canvas_item_default_texture_filter = 0
-render_target_update_mode = 4
-script = ExtResource("2_hvo65")
-
-[node name="ImageSprite" type="Sprite2D" parent="ImageViewport"]
-
-[node name="ImageViewportDisplay" type="Sprite2D" parent="."]
-texture = SubResource("ViewportTexture_lct1c")
-script = ExtResource("3_n4itb")
-
-[node name="UI_Layer" type="CanvasLayer" parent="."]
-
-[node name="FokusStealer" type="Control" parent="UI_Layer"]
-layout_mode = 3
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-focus_mode = 2
-
-[node name="UserInterfaceContainer" type="Control" parent="UI_Layer"]
-layout_mode = 3
-anchor_right = 0.225
-anchor_bottom = 1.0
-offset_right = 288.0
-grow_horizontal = 2
-grow_vertical = 2
-
-[node name="Background" type="ColorRect" parent="UI_Layer/UserInterfaceContainer"]
-material = SubResource("ShaderMaterial_onhxk")
-layout_mode = 1
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-focus_mode = 2
-color = Color(1, 1, 1, 0)
-
-[node name="AppName" type="Label" parent="UI_Layer/UserInterfaceContainer"]
-layout_mode = 0
-offset_left = 24.0
-offset_top = 24.0
-offset_right = 208.0
-offset_bottom = 56.0
-theme_override_font_sizes/font_size = 20
-text = "GlitchApp
-"
-vertical_alignment = 2
-
-[node name="AppVersion" type="Label" parent="UI_Layer/UserInterfaceContainer"]
-layout_mode = 0
-offset_left = 128.0
-offset_top = 24.0
-offset_right = 208.0
-offset_bottom = 56.0
-theme_override_font_sizes/font_size = 14
-text = "v0
-"
-vertical_alignment = 2
-script = ExtResource("5_o1ggv")
-
-[node name="OpenImageDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer"]
-title = "Load Image"
-size = Vector2i(521, 159)
-ok_button_text = "Open"
-mode_overrides_title = false
-file_mode = 0
-access = 2
-use_native_dialog = true
-
-[node name="SaveImageDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer"]
-title = "Export Image"
-size = Vector2i(661, 159)
-ok_button_text = "Save"
-mode_overrides_title = false
-access = 2
-filters = PackedStringArray("*.png")
-use_native_dialog = true
-
-[node name="OpenImageButton" type="Button" parent="UI_Layer/UserInterfaceContainer"]
-layout_mode = 1
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -360.0
-offset_top = 24.0
-offset_right = -248.0
-offset_bottom = 56.0
-grow_horizontal = 0
-text = "Load Image"
-
-[node name="SaveImageButton" type="Button" parent="UI_Layer/UserInterfaceContainer"]
-layout_mode = 1
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -240.0
-offset_top = 23.0
-offset_right = -120.0
-offset_bottom = 55.0
-grow_horizontal = 0
-text = "Export Image"
-
-[node name="FitImageButton" type="Button" parent="UI_Layer/UserInterfaceContainer"]
-layout_mode = 1
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -112.0
-offset_top = 24.0
-offset_right = -24.0
-offset_bottom = 56.0
-grow_horizontal = 0
-text = "Fit Image"
-
-[node name="Editor" type="Control" parent="UI_Layer/UserInterfaceContainer"]
-layout_mode = 1
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-offset_left = 24.0
-offset_top = 80.0
-offset_right = -24.0
-offset_bottom = -24.0
-grow_horizontal = 2
-grow_vertical = 2
-script = ExtResource("7_g8bap")
-
-[node name="OpenShaderDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer/Editor"]
-title = "Load Shader"
-size = Vector2i(521, 159)
-ok_button_text = "Open"
-mode_overrides_title = false
-file_mode = 0
-access = 2
-filters = PackedStringArray("*.gdshader")
-use_native_dialog = true
-
-[node name="SaveShaderDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer/Editor"]
-title = "Save Shader"
-size = Vector2i(661, 159)
-ok_button_text = "Save"
-mode_overrides_title = false
-access = 2
-filters = PackedStringArray("*.gdshader")
-use_native_dialog = true
-
-[node name="Label" type="Label" parent="UI_Layer/UserInterfaceContainer/Editor"]
-layout_mode = 0
-offset_right = 104.0
-offset_bottom = 32.0
-text = "Load Preset: "
-vertical_alignment = 1
-
-[node name="PresetOptions" type="OptionButton" parent="UI_Layer/UserInterfaceContainer/Editor"]
-layout_mode = 0
-offset_left = 104.0
-offset_right = 240.0
-offset_bottom = 32.0
-
-[node name="CodeEdit" type="CodeEdit" parent="UI_Layer/UserInterfaceContainer/Editor"]
-layout_mode = 1
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-offset_top = 48.0
-grow_horizontal = 2
-grow_vertical = 2
-theme_override_font_sizes/font_size = 14
-placeholder_text = "// Test"
-wrap_mode = 1
-minimap_draw = true
-minimap_width = 40
-caret_blink = true
-draw_control_chars = true
-draw_tabs = true
-draw_spaces = true
-line_length_guidelines = Array[int]([80])
-gutters_draw_line_numbers = true
-code_completion_enabled = true
-indent_automatic = true
-auto_brace_completion_enabled = true
-auto_brace_completion_highlight_matching = true
-
-[node name="OpenShaderButton" type="Button" parent="UI_Layer/UserInterfaceContainer/Editor"]
-layout_mode = 1
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -216.0
-offset_right = -160.0
-offset_bottom = 32.0
-grow_horizontal = 0
-text = "Open"
-
-[node name="SaveShaderButton" type="Button" parent="UI_Layer/UserInterfaceContainer/Editor"]
-layout_mode = 1
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -152.0
-offset_right = -96.0
-offset_bottom = 32.0
-grow_horizontal = 0
-text = "Save"
-
-[node name="ApplyShaderButton" type="Button" parent="UI_Layer/UserInterfaceContainer/Editor"]
-layout_mode = 1
-anchors_preset = 1
-anchor_left = 1.0
-anchor_right = 1.0
-offset_left = -88.0
-offset_bottom = 32.0
-grow_horizontal = 0
-text = "Apply (F5)"
-
-[node name="Camera" type="Camera2D" parent="."]
-script = ExtResource("8_mls06")
-
-[connection signal="file_selected" from="UI_Layer/UserInterfaceContainer/OpenImageDialog" to="." method="_on_open_image_dialog_file_selected"]
-[connection signal="file_selected" from="UI_Layer/UserInterfaceContainer/SaveImageDialog" to="." method="_on_save_image_dialog_file_selected"]
-[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/OpenImageButton" to="." method="_on_open_image_button_pressed"]
-[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/SaveImageButton" to="." method="_on_save_image_button_pressed"]
-[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/FitImageButton" to="Camera" method="_on_fit_image_button_pressed"]
-[connection signal="file_selected" from="UI_Layer/UserInterfaceContainer/Editor/OpenShaderDialog" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_open_shader_dialog_file_selected"]
-[connection signal="file_selected" from="UI_Layer/UserInterfaceContainer/Editor/SaveShaderDialog" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_save_shader_dialog_file_selected"]
-[connection signal="item_selected" from="UI_Layer/UserInterfaceContainer/Editor/PresetOptions" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_preset_options_item_selected"]
-[connection signal="code_completion_requested" from="UI_Layer/UserInterfaceContainer/Editor/CodeEdit" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_code_edit_code_completion_requested"]
-[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/Editor/OpenShaderButton" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_open_shader_button_pressed"]
-[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/Editor/SaveShaderButton" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_save_shader_button_pressed"]
-[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/Editor/ApplyShaderButton" to="UI_Layer/UserInterfaceContainer/Editor" method="_on_apply_shader_button_pressed"]

shaderlib/blur.gdshaderinc

@@ -0,0 +1,32 @@
+
+/*
+	gaussian_blur adapted from https://godotshaders.com/shader/customizable-gausian-blur/
+	original code by https://godotshaders.com/author/djbob-gaming-yt/
+	maximum radius is 64
+*/
+vec4 gaussian_blur(sampler2D texture, vec2 uv, int radius, float sigma) {
+	vec2 resolution = 1.0 / vec2(textureSize(texture, 0));
+	// calculate kernel
+	float kernel[64];
+	float sum = 0.0;
+	for (int i = 0; i <= radius; i++) {
+		kernel[i] = exp(-0.5 * float(i * i) / (sigma * sigma));
+		sum += i == 0 ? kernel[i] : 2.0 * kernel[i];
+	}
+	for (int i = 0; i <= radius; i++) {
+		kernel[i] /= sum;
+	}
+	//
+	vec4 final_color = vec4(0.0);
+	float total_weight = 0.0;
+	for (int x = -radius; x <= radius; x++) {
+		for (int y = -radius; y <= radius; y++) {
+			float weight = kernel[abs(x)] * kernel[abs(y)];
+			vec2 offset = vec2(float(x), float(y)) * resolution;
+			final_color += texture(texture, uv + offset) * weight;
+			total_weight += weight;
+		}
+	}
+	final_color /= total_weight;
+	return final_color;
+}

shaderlib/blur.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://bjtljvcjcu6dr

shaderlib/common.gdshaderinc

@@ -0,0 +1,27 @@
+
+// inefficient cuberoot function
+float cbrt(float x) {
+	return pow(x, 1.0/3.0);
+}
+
+/*
+	Alpha Blending a over b after Bruce A. Wallace
+	source: https://en.wikipedia.org/wiki/Alpha_compositing
+*/
+vec4 alpha_blend(vec4 b, vec4 a) {
+	float alpha = a.a + (b.a * (1.0 - a.a));
+	vec3 col = ((a.rgb*a.a) + ((b.rgb*b.a) * (1.0 - a.a)) / alpha);
+	return vec4(col.r, col.g, col.b, alpha);
+}
+
+/*
+	Rotate UV
+*/
+
+vec2 rotateUV(vec2 uv, float rotation, vec2 center) {
+	float cosRot = cos(rotation);
+	float sinRot = sin(rotation);
+    return vec2(
+		cosRot * (uv.x - center.x) + sinRot * (uv.y - center.y) + center.x,
+        cosRot * (uv.y - center.y) - sinRot * (uv.x - center.x) + center.y);
+}

shaderlib/common.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://764b6ekchgb8

shaderlib/denoise.gdshaderinc

@@ -0,0 +1,68 @@
+
+/*
+	glslSmartDenoise by Michele Morrone, adapted
+	original code: https://github.com/BrutPitt/glslSmartDeNoise
+	license of the original code:
+
+	BSD 2-Clause License
+
+	Copyright (c) 2019-2020 Michele Morrone
+	All rights reserved.
+
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are met:
+
+	1. Redistributions of source code must retain the above copyright notice, this
+	   list of conditions and the following disclaimer.
+
+	2. Redistributions in binary form must reproduce the above copyright notice,
+	   this list of conditions and the following disclaimer in the documentation
+	   and/or other materials provided with the distribution.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+	AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+	DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+	FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+	SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+	CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+	OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#define INV_SQRT_OF_2PI 0.39894228040143267793994605993439  // 1.0/SQRT_OF_2PI
+#define INV_PI 0.31830988618379067153776752674503
+
+vec4 smart_denoise(sampler2D tex, vec2 uv, float sigma, float kSigma, float threshold) {
+	float radius = round(kSigma*sigma);
+	float radQ = radius * radius;
+
+	float invSigmaQx2 = .5 / (sigma * sigma);      // 1.0 / (sigma^2 * 2.0)
+	float invSigmaQx2PI = INV_PI * invSigmaQx2;    // 1/(2 * PI * sigma^2)
+
+	float invThresholdSqx2 = .5 / (threshold * threshold);     // 1.0 / (sigma^2 * 2.0)
+	float invThresholdSqrt2PI = INV_SQRT_OF_2PI / threshold;   // 1.0 / (sqrt(2*PI) * sigma^2)
+
+	vec4 centrPx = texture(tex,uv);
+
+	float zBuff = 0.0;
+	vec4 aBuff = vec4(0.0);
+	vec2 size = vec2(textureSize(tex, 0));
+
+	for (float dx = -radius; dx <= radius; dx++) {
+		float pt = sqrt(radQ - dx * dx);       // pt = yRadius: have circular trend
+		for (float dy = -pt; dy <= pt; dy++) {
+			vec2 d = vec2(dx, dy);
+			float blurFactor = exp( -dot(d, d) * invSigmaQx2 ) * invSigmaQx2PI;
+
+			vec4 walkPx =  texture(tex,uv+d/size);
+			vec4 dC = walkPx-centrPx;
+			float deltaFactor = exp(-dot(dC, dC) * invThresholdSqx2) * invThresholdSqrt2PI * blurFactor;
+
+			zBuff += deltaFactor;
+			aBuff += deltaFactor*walkPx;
+		}
+	}
+	return aBuff/zBuff;
+}

shaderlib/denoise.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://b7ksfifyyfcip

shaderlib/hsv.gdshaderinc

@@ -0,0 +1,27 @@
+
+/*
+	rgb2hsv and hsv2rgb functions adapted
+	from https://godotshaders.com/shader/hsv-adjustment/
+	original code by https://godotshaders.com/author/al1-ce/
+
+	Color space conversion functions always work with vec4.
+	The fourth value is always alpha.
+*/
+
+// Convert RGB to HSV (hue, saturation, brightness)
+vec4 rgb2hsv(vec4 c) {
+	vec4 K = vec4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
+	vec4 p = mix(vec4(c.bg, K.wz), vec4(c.gb, K.xy), step(c.b, c.g));
+	vec4 q = mix(vec4(p.xyw, c.r), vec4(c.r, p.yzx), step(p.x, c.r));
+	float d = q.x - min(q.w, q.y);
+	float e = 1.0e-10;
+	return vec4(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x, c.a);
+}
+
+// Convert HSV back to RGB (red, green, blue)
+vec4 hsv2rgb(vec4 c) {
+	vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
+	vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
+	vec3 rgb =  c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
+	return vec4(rgb.r, rgb.g, rgb.b, c.a);
+}

shaderlib/hsv.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://bbr3tq6mp5qa2

shaderlib/kuwahara.gdshaderinc

@@ -0,0 +1,116 @@
+/*
+	Kuwahara Filter, adapted
+	original code: https://godotshaders.com/shader/generalized-kuwahara/
+	original authors:
+		- https://godotshaders.com/author/firerabbit/
+		- https://github.com/GarrettGunnell (Acerola)
+	license of the original code:
+
+	MIT License
+
+	Copyright (c) 2022 Garrett Gunnell
+	Copyright (c) 2024 Firerabbit
+
+	Permission is hereby granted, free of charge, to any person obtaining a copy of this
+	software and associated documentation files (the "Software"), to deal in the Software
+	without restriction, including without limitation the rights to use, copy, modify, merge,
+	publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+	to whom the Software is furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included in all copies
+	or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+	THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+	IN THE SOFTWARE.
+*/
+
+vec3 kuwahara(
+	sampler2D texture,
+	vec2 uv,
+	int kernel_size,	 // should be > 2 - high values will affect performance
+	float hardness,		 // should be in the range of 1.0 - 100.0
+	float sharpness,	 // should be in the range of 1.0 - 18.0
+	float zero_crossing, // should be in the range of 0.5 - 2.0
+	float zeta,			 // should be in the range of 0.01 - 3.0
+	int n				 // number of iterations, should be 8, must be <= 8
+)  {
+	vec2 texelSize = vec2(1.0 / vec2(textureSize(texture, 0)));
+	vec4 m[8];
+	vec3 s[8];
+
+	int kernel_radius = kernel_size / 2;
+
+	float sin_zero_crossing = sin(zero_crossing);
+	float eta = (zeta + cos(zero_crossing)) / (sin_zero_crossing * sin_zero_crossing);
+
+	for (int k = 0; k < n; ++k) {
+		m[k] = vec4(0.0f);
+		s[k] = vec3(0.0f);
+	}
+
+	for (int y = -kernel_radius; y <= kernel_radius; ++y) {
+		for (int x = -kernel_radius; x <= kernel_radius; ++x) {
+			vec2 v = vec2(float(x), float(y)) / float(kernel_radius);
+			vec3 c = texture(texture, uv + vec2(float(x), float(y)) * texelSize.xy).rgb;
+			c = clamp(c, 0.0f, 1.0f);
+			float sum = 0.0f;
+			float w[8];
+			float z, vxx, vyy;
+
+			/* Calculate Polynomial Weights */
+			vxx = zeta - eta * v.x * v.x;
+			vyy = zeta - eta * v.y * v.y;
+			z = max(0, v.y + vxx);
+			w[0] = z * z;
+			sum += w[0];
+			z = max(0, -v.x + vyy);
+			w[2] = z * z;
+			sum += w[2];
+			z = max(0, -v.y + vxx);
+			w[4] = z * z;
+			sum += w[4];
+			z = max(0, v.x + vyy);
+			w[6] = z * z;
+			sum += w[6];
+			v = sqrt(2.0f) / 2.0f * vec2(v.x - v.y, v.x + v.y);
+			vxx = zeta - eta * v.x * v.x;
+			vyy = zeta - eta * v.y * v.y;
+			z = max(0, v.y + vxx);
+			w[1] = z * z;
+			sum += w[1];
+			z = max(0, -v.x + vyy);
+			w[3] = z * z;
+			sum += w[3];
+			z = max(0, -v.y + vxx);
+			w[5] = z * z;
+			sum += w[5];
+			z = max(0, v.x + vyy);
+			w[7] = z * z;
+			sum += w[7];
+
+			float g = exp(-3.125f * dot(v,v)) / sum;
+
+			for (int k = 0; k < 8; ++k) {
+				float wk = w[k] * g;
+				m[k] += vec4(c * wk, wk);
+				s[k] += c * c * wk;
+			}
+		}
+	}
+
+	vec4 output = vec4(0.0f);
+	for (int k = 0; k < n; ++k) {
+		m[k].rgb /= m[k].w;
+		s[k] = abs(s[k] / m[k].w - m[k].rgb * m[k].rgb);
+		float sigma2 = s[k].r + s[k].g + s[k].b;
+		float w = 1.0f / (1.0f + pow(hardness * 1000.0f * sigma2, 0.5f * sharpness));
+		output += vec4(m[k].rgb * w, w);
+	}
+
+	return clamp(output / output.w, 0.0f, 1.0f).rgb;
+}

shaderlib/kuwahara.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://chqh2cni1qiuu

shaderlib/oklab.gdshaderinc

@@ -0,0 +1,70 @@
+
+/*
+	OkLab and OkLCh
+	For more details on oklab, see
+		- https://bottosson.github.io/posts/oklab/
+		- https://en.wikipedia.org/wiki/Oklab_color_space
+
+	Color space conversion functions always work with vec4.
+	The fourth value is always alpha.
+*/
+
+#include "./common.gdshaderinc"
+
+vec4 rgb2oklab(vec4 c) {
+	// oklab.x and .y (a and b) should range from -0.5 to 0.5
+
+	float l = 0.4122214708f * c.r + 0.5363325363f * c.g + 0.0514459929f * c.b;
+	float m = 0.2119034982f * c.r + 0.6806995451f * c.g + 0.1073969566f * c.b;
+	float s = 0.0883024619f * c.r + 0.2817188376f * c.g + 0.6299787005f * c.b;
+
+	float l_ = cbrt(l);
+	float m_ = cbrt(m);
+	float s_ = cbrt(s);
+
+	return vec4(
+		0.2104542553f*l_ + 0.7936177850f*m_ - 0.0040720468f*s_,
+		1.9779984951f*l_ - 2.4285922050f*m_ + 0.4505937099f*s_,
+		0.0259040371f*l_ + 0.7827717662f*m_ - 0.8086757660f*s_,
+		c.a
+	);
+}
+
+vec4 oklab2rgb(vec4 c) {
+	// oklab.x and .y (a and b) should range from -0.5 to 0.5
+
+	float l_ = c.x + 0.3963377774f * c.y + 0.2158037573f * c.z;
+	float m_ = c.x - 0.1055613458f * c.y - 0.0638541728f * c.z;
+	float s_ = c.x - 0.0894841775f * c.y - 1.2914855480f * c.z;
+
+	float l = l_*l_*l_;
+	float m = m_*m_*m_;
+	float s = s_*s_*s_;
+
+	return vec4(
+		+4.0767416621f * l - 3.3077115913f * m + 0.2309699292f * s,
+		-1.2684380046f * l + 2.6097574011f * m - 0.3413193965f * s,
+		-0.0041960863f * l - 0.7034186147f * m + 1.7076147010f * s,
+		c.a
+	);
+}
+
+vec4 oklab2oklch(vec4 c) {
+	// oklch.z (hue) ranges from -3.6 to 3.6
+	return vec4(
+		c.x,
+		sqrt((c.y * c.y) + (c.z * c.z)),
+		atan(c.z, c.y),
+		c.a
+	);
+}
+
+vec4 oklch2oklab(vec4 c) {
+	// oklch.z (hue) ranges from -3.6 to 3.6
+	return vec4(
+		c.x,
+		c.y * cos(c.z),
+		c.y * sin(c.z),
+		c.a
+	);
+}

shaderlib/oklab.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://ckw4nfslk4m6l

shaderlib/pixelate.gdshaderinc

@@ -0,0 +1,14 @@
+
+// pixelate by lowering uv resolution
+vec4 pixelate(sampler2D tex, vec2 uv, float resolution_x) {
+	vec2 texture_size = vec2(textureSize(tex, 0));
+	vec2 ratio;
+	if (texture_size.x > texture_size.y) {
+		ratio = vec2(texture_size.x / texture_size.y, 1.0);
+	}
+	else {
+		ratio = vec2(1.0, texture_size.y / texture_size.x);
+	}
+	vec2 r = ratio * resolution_x;
+	return texture(tex, trunc(uv * r) / r);
+}

shaderlib/pixelate.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://dpu5nneo5bgnq

shaderlib/pixelsort.gdshaderinc

@@ -0,0 +1,126 @@
+
+/*
+	Pixelsorting using odd-even sort
+
+	I roughly followed https://ciphrd.com/2020/04/08/pixel-sorting-on-shader-using-well-crafted-sorting-filters-glsl/
+	- vector fields aren't implemented, diagonal sorting is not supported!
+*/
+
+#include "./hsv.gdshaderinc"
+#include "./oklab.gdshaderinc"
+
+#define INF (1.0/0.0)
+
+#define DIRECTION_LEFT_TO_RIGHT vec2(1, 0)
+#define DIRECTION_RIGHT_TO_LEFT vec2(-1, 0)
+#define DIRECTION_TOP_TO_BOTTOM vec2(0, 1)
+#define DIRECTION_BOTTOM_TO_TOP vec2(0, -1)
+
+#define COLOR_MODE_RGB 0
+#define COLOR_MODE_OKLAB 1
+#define COLOR_MODE_OKLCH 2
+#define COLOR_MODE_HSV 3
+
+vec4 pixelsort_step(
+	sampler2D tex, vec2 uv,
+	vec2 direction, // e.g. (1, 0) for left-to-right or (0, -1) for bottom-to-top
+	                // see DIRECTION_LEFT_TO_RIGHT, etc.
+	                // note: vertical sorting doesn't work, so using e.g. (1, 1) won't work
+	int color_mode, // 0 = RGB, 1 = OKLAB, 2 = OKLCH, 3 = HSV
+	                // see COLOR_MODE_RGB, etc.
+	bool color_channel_mask[3], // which color channel(s) to take into account
+	float lower_threshold[3],   // lower threshold for pixels to be considered sorted
+	                            // when in doubt, use {-INF, -INF, -INF}
+	float upper_threshold[3],   // upper threshold; {INF, INF, INF}
+	int step_ // from STEP
+) {
+	// sanitize inputs
+	direction = clamp(direction, vec2(-1, -1), vec2(1, 1));
+	color_mode = clamp(color_mode, 0, 3);
+	// get neighbour
+	vec2 texture_size = vec2(textureSize(tex, 0));
+	vec2 a = (mod(floor(uv * texture_size), 2.0) * 2.0 - 1.0) * (mod(float(step_), 2.0) * 2.0 - 1.0);
+	vec2 neighbour_uv = uv + (direction * a / texture_size);
+	//
+	vec4 x = texture(tex, uv);
+	vec4 y = texture(tex, neighbour_uv);
+	if ( // stop at borders
+		neighbour_uv.x > 1.0 ||
+		neighbour_uv.x < 0.0 ||
+		neighbour_uv.y > 1.0 ||
+		neighbour_uv.y < 0.0
+	) {
+		return x;
+	} else {
+		// convert color if necessary
+		// get value to compare
+		float vx = 0.0;
+		float vy = 0.0;
+		vec3 color_x;
+		vec3 color_y;
+		if (color_mode == COLOR_MODE_RGB) {
+			color_x = x.rgb;
+			color_y = y.rgb;
+		} else if (color_mode == COLOR_MODE_OKLAB) {
+			color_x = rgb2oklab(x).rgb;
+			color_y = rgb2oklab(y).rgb;
+		} else if (color_mode == COLOR_MODE_OKLCH) {
+			color_x = oklab2oklch(rgb2oklab(x)).rgb;
+			color_y = oklab2oklch(rgb2oklab(y)).rgb;
+		} else if (color_mode == COLOR_MODE_HSV) {
+			color_x = rgb2hsv(x).rgb;
+			color_y = rgb2hsv(y).rgb;
+		}
+		float divisor = 0.0;
+		if (color_channel_mask[0]) {
+			vx += color_x.r;
+			vy += color_y.r;
+			divisor += 1.0;
+		}
+		if (color_channel_mask[1]) {
+			vx += color_x.g;
+			vy += color_y.g;
+			divisor += 1.0;
+		}
+		if (color_channel_mask[2]) {
+			vx += color_x.b;
+			vy += color_y.b;
+			divisor += 1.0;
+		}
+		divisor = max(divisor, 1.0);
+		vx /= divisor;
+		vy /= divisor;
+		//
+		if (
+			(a.x < .0 && abs(direction).y == .0) ||
+			(a.y < .0 && abs(direction).x == .0)
+		) {
+			if (
+				vy > vx &&
+				// threshold
+				color_x.r < upper_threshold[0] &&
+				color_x.g < upper_threshold[1] &&
+				color_x.b < upper_threshold[2] &&
+				color_x.r > lower_threshold[0] &&
+				color_x.g > lower_threshold[1] &&
+				color_x.b > lower_threshold[2]
+			) { return y; }
+			else { return x; }
+		} else if (
+			(a.x > .0 && abs(direction).y == .0) ||
+			(a.y > .0 && abs(direction).x == .0)
+		) {
+			if (
+				vx >= vy &&
+				// threshold
+				color_y.r < upper_threshold[0] &&
+				color_y.g < upper_threshold[1] &&
+				color_y.b < upper_threshold[2] &&
+				color_y.r > lower_threshold[0] &&
+				color_y.g > lower_threshold[1] &&
+				color_y.b > lower_threshold[2]
+			) { return y; }
+			else { return x; }
+		}
+	}
+}

shaderlib/pixelsort.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://doefnwk3vyr0o

shaderlib/place_texture.gdshaderinc

@@ -0,0 +1,21 @@
+
+/*
+	Load in a texture from a sampler2D with an offset and scale
+	See examples/place_texture.gdshader
+*/
+vec4 place_texture(sampler2D sampler, vec2 uv, vec2 texture_pixel_size, vec2 offset, vec2 scale) {
+	vec2 texture_size = vec2(textureSize(sampler, 0));
+	// position of current pixel; sample color c
+	vec2 pos = (uv - offset) / (texture_size*texture_pixel_size) / scale;
+	vec4 c = texture(sampler, pos);
+	// top-left bounds
+	vec2 a = offset;
+	// bottom-right bounds
+	vec2 b = offset + (texture_size*texture_pixel_size) * scale;
+	// check bounds
+	if (
+		a.x  < uv.x && a.y  < uv.y
+		&& b.x > uv.x && b.y > uv.y
+	) { return c; } // within bounds -> return color
+	return vec4(0); // not within bounds -> return transparency
+}

shaderlib/place_texture.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://51u2hjq62e5i

shaderlib/sobel.gdshaderinc

@@ -0,0 +1,50 @@
+
+/*
+	Edge Detection (Sobel Filter and Gaussian Blur) by FencerDevLog, adapted
+	original code: https://godotshaders.com/shader/edge-detection-sobel-filter-and-gaussian-blur/
+	license of the original code: CC0
+*/
+
+vec3 _convolution(sampler2D tex, vec2 uv, vec2 pixel_size) {
+	vec3 conv = vec3(0.0);
+	// Gaussian blur kernel
+	float gauss[25] = {
+		0.00390625, 0.015625, 0.0234375, 0.015625, 0.00390625,
+		0.015625, 0.0625, 0.09375, 0.0625, 0.015625,
+		0.0234375, 0.09375, 0.140625, 0.09375, 0.0234375,
+		0.015625, 0.0625, 0.09375, 0.0625, 0.015625,
+		0.00390625, 0.015625, 0.0234375, 0.015625, 0.00390625
+	};
+	for (int row = 0; row < 5; row++) {
+		for (int col = 0; col < 5; col++) {
+			conv += texture(tex, uv + vec2(float(col - 2), float(row - 2)) * pixel_size).rgb * gauss[row * 5 + col];
+		}
+	}
+	return conv;
+}
+
+vec4 sobel(sampler2D tex, vec2 uv) {
+	vec2 pixel_size = 1.0/vec2(textureSize(tex, 0));
+	vec3 pixels[9];  // Sobel kernel
+	// [0, 1, 2]
+	// [3, 4, 5]
+	// [6, 7, 8]
+	for (int row = 0; row < 3; row++) {
+		for (int col = 0; col < 3; col++) {
+			vec2 uv_ = uv + vec2(float(col - 1), float(row - 1)) * pixel_size;
+			pixels[row * 3 + col] = _convolution(tex, uv_, pixel_size);
+		}
+	}
+
+	// Sobel operator
+	vec3 gx = (
+		pixels[0] * -1.0 + pixels[3] * -2.0 + pixels[6] * -1.0
+		+ pixels[2] * 1.0 + pixels[5] * 2.0 + pixels[8] * 1.0
+	);
+	vec3 gy = (
+		pixels[0] * -1.0 + pixels[1] * -2.0 + pixels[2] * -1.0
+		+ pixels[6] * 1.0 + pixels[7] * 2.0 + pixels[8] * 1.0
+	);
+	vec3 sobel = sqrt(gx * gx + gy * gy);
+	return vec4(sobel, 1.0);
+}

shaderlib/sobel.gdshaderinc.uid

@@ -0,0 +1 @@
+uid://bqo1fpunnl05f

src/Camera.gd

@@ -1,42 +1,50 @@
 extends Camera2D
 
+@onready var image_viewport_display = %ImageViewportDisplay
+
 var drag = false
 
-@onready var user_interface_container = get_parent().get_node("UI_Layer/UserInterfaceContainer")
-@onready var image_viewport = get_parent().get_node("ImageViewport")
-
 func _input(event):
-	if event.is_action_pressed("zoom_out") && !Globals.camera_freeze:
+	if event.is_action_pressed("zoom_out"):
 		zoom_out()
-	elif event.is_action_pressed("zoom_in") && !Globals.camera_freeze:
+	elif event.is_action_pressed("zoom_in"):
 		zoom_in()
-	if event.is_action_pressed("drag") && !Globals.camera_freeze:
-		drag = true
+	if event.is_action_pressed("drag"):
+		self.drag = true
 	elif event.is_action_released("drag"):
-		drag = false
-	if drag && event is InputEventMouseMotion:
-		global_position -= event.relative / zoom
+		self.drag = false
+	if self.drag && event is InputEventMouseMotion:
+		self.global_position -= event.relative / self.zoom
+
+var old_zoom = self.zoom
+
+func _process(_delta: float) -> void:
+	if self.zoom != old_zoom:
+		image_viewport_display.update_zoom_texture_filter(self.zoom)
+		image_viewport_display.material.set_shader_parameter("zoom_level", self.zoom)
+		old_zoom = self.zoom
 
 func fit_image():
-	if image_viewport.image_original_tex != null:
-		var ui_container_size = user_interface_container.size
-		var image_size = image_viewport.image_original_tex.get_size()
+	if Filesystem.original_image != null:
+		var image_size = Filesystem.original_image.get_size()
 		var viewport_size = get_viewport_rect().size
-		var zoomf = (viewport_size.x - ui_container_size.x) / image_size.x / 1.1
-		if zoomf * image_size.y > viewport_size.y:
-			zoomf = viewport_size.y / image_size.y / 1.1
-		zoom = Vector2(zoomf, zoomf)
-		global_position = Vector2(-((ui_container_size.x) / 2 / zoom.x), 0)
+		var zoomf = 1.0
+		if viewport_size.x / image_size.x * image_size.y > viewport_size.y:
+			zoomf = viewport_size.y / image_size.y / 1.25
+		else:
+			zoomf = viewport_size.x / image_size.x / 1.2 
+		self.zoom = Vector2(zoomf, zoomf)
+		self.global_position = Vector2(0, 0)
 
 func zoom_in():
 	var old_mouse_pos = get_global_mouse_position()
-	zoom *= 1.2
-	global_position += old_mouse_pos - get_global_mouse_position()
+	self.zoom *= 1.2
+	self.global_position += old_mouse_pos - get_global_mouse_position()
 
 func zoom_out():
 	var old_mouse_pos = get_global_mouse_position()
-	zoom *= 1/1.2
-	global_position += old_mouse_pos - get_global_mouse_position()
+	self.zoom *= 1/1.2
+	self.global_position += old_mouse_pos - get_global_mouse_position()
 
 func _on_fit_image_button_pressed():
 	fit_image()

src/Camera.gd.uid

@@ -0,0 +1 @@
+uid://b6r8rigubdctk

src/Editor.gd

@@ -1,243 +0,0 @@
-extends Control
-
-@onready var preset_options = $PresetOptions
-@onready var code_editor = $CodeEdit
-@onready var open_shader_dialog = $OpenShaderDialog
-@onready var save_shader_dialog = $SaveShaderDialog
-var selected_preset_name = ShaderPresets.default_preset
-var last_save_filepath = ""
-
-# # # # # # # # # # #
-# GDShader keywords #
-# https://github.com/godotengine/godot/blob/e96ad5af98547df71b50c4c4695ac348638113e0/servers/rendering/shader_language.cpp
-# https://github.com/godotengine/godot/blob/e96ad5af98547df71b50c4c4695ac348638113e0/servers/rendering/shader_types.cpp
-#
-const gdshader_boolean_values = [
-	"true", "false"
-]
-const gdshader_datatypes = [
-	"void",
-	"bool", "bvec2", "bvec3", "bvec4",
-	"int", "ivec2", "ivec3", "ivec4",
-	"uint", "uvec2", "uvec3", "uvec4",
-	"float", "vec2", "vec3", "vec4",
-	"mat2", "mat3", "mat4",
-	"sampler2D", "isampler2D", "usampler2D",
-	"sampler2DArray", "isampler2DArray", "usampler2DArray",
-]
-const gdshader_precision_modifiers = [
-	"lowp", "mediump", "heighp"
-]
-const gdshader_global_space_keywords = [
-	"uniform", "group_uniforms", "varying", "const",
-	"struct", "shader_type", "render_mode"
-]
-const gdshader_uniform_qualifiers = [
-	"instance", "global"
-]
-const gdshader_block_keywords = [
-	"if", "else",
-	"for", "while", "do",
-	"switch", "case",
-	"default", "break", "continue",
-	"return", "discard"
-]
-const gdshader_function_specifier_keywords = [
-	"in", "out", "inout"
-]
-const gdshader_hints = [
-	"source_color", "hint_range", "instance_index"
-]
-const gdshader_sampler_hints = [
-	"hint_normal",
-	"hint_default_white", "hint_default_black", "hint_default_transparent",
-	"hint_anisotropy",
-	"hint_roughness_r", "hint_roughness_g", "hint_roughness_b", "hint_roughness_a",
-	"hint_roughness_normal", "hint_roughness_gray",
-	"hint_screen_texture", "hint_normal_roughness_texture",
-	"hint_depth_texture",
-	"filter_nearest", "filter_linear",
-	"filter_nearest_mipmap", "filter_linear_mipmap",
-	"filter_nearest_mipmap_anisotropic", "filter_linear_mipmap_anisotropic",
-	"repeat_enable", "repeat_disable"
-]
-const gdshader_builtin_functions = [
-	"radians", "degrees",
-	"sin", "cos", "tan", "asin", "acos", "atan", "sinh", "cosh", "tanh",
-	"asinh", "acosh", "atanh",
-	"pow", "exp", "log", "exp2", "log2", "sqrt", "inversesqrt",
-	"abs", "sign", "floor", "trunc", "round", "roundEven", "ceil", "fract",
-	"mod", "modf", "min", "max", "clamp",
-	"mix", "step", "smoothstep",
-	"isnan", "isinf",
-	"floatBitsToInt", "floatBitsToUint", "intBitsToFloat", "uintBitsToFloat",
-	"length", "distance",
-	"dot", "cross",
-	"normalize", "reflect", "refract", "faceforward",
-	"matrixCompMult", "outerProduct", "transpose",
-	"determinant", "inverse",
-	"lessThan", "greaterThan", "lessThanEqual", "greaterThanEqual",
-	"equal", "notEqual",
-	"any", "all", "not",
-	"textureSize", "texture", "textureProj", "textureLod", "texelFetch",
-	"textureProjLod", "textureGrad", "textureProjGrad", "textureGather",
-	"textureQueryLod", "textureQueryLevels",
-	"dFdx", "dFdxCoarse", "dFdxFine", "dFdy", "dFdyCoarse", "dFdyFine",
-	"fwidth", "fwidthCoarse", "fwidthFine"
-]
-const gdshader_sub_functions = [
-	"length", "fma",
-	"packHalf2x16", "packUnorm2x16", "packSnorm2x16", "packUnorm4x8", "packSnorm4x8",
-	"unpackHalf2x16", "unpackUnorm2x16", "unpackSnorm2x16", "unpackUnorm4x8", "unpackSnorm4x8",
-	"bitfieldExtract", "bitfieldInsert", "bitfieldReverse", "bitCount",
-	"findLSB", "findMSB",
-	"umulExtended", "imulExtended",
-	"uaddCarry", "usubBorrow",
-	"ldexp", "frexp"
-]
-const gdshader_builtins = [
-	"TIME", "PI", "TAU", "E",
-	"VERTEX",
-	"UV",
-	"COLOR",
-	"POINT_SIZE",
-	"MODEL_MATRIX", "CANVAS_MATRIX", "SCREEN_MATRIX",
-	"INSTANCE_CUSTOM", "INSTANCE_ID",
-	"VERTEX_ID",
-	"AT_LIGHT_PASS",
-	"TEXTURE_PIXEL_SIZE",
-	"CUSTOM0", "CUSTOM1",
-	"SHADOW_VERTEX", "LIGHT_VERTEX",
-	"FRAGCOORD",
-	"NORMAL", "NORMAL_MAP", "NORMAL_MAP_DEPTH",
-	"TEXTURE", "NORMAL_TEXTURE",
-	"SCREEN_UV", "SCREEN_PIXEL_SIZE",
-	"POINT_COORD",
-]
-#
-# configure Highlighter
-#
-class ShaderSyntaxHighlighter extends CodeHighlighter:
-	func _init():
-		add_color_region("//", "", Color.WEB_GRAY, true)
-		add_color_region("/*", "*/", Color.WEB_GRAY, false)
-		function_color = Color.INDIAN_RED
-		for k in gdshader_boolean_values:
-			keyword_colors[k] = Color.INDIAN_RED
-		for k in (	gdshader_datatypes
-					+ gdshader_hints
-					+ gdshader_sampler_hints
-					+ gdshader_global_space_keywords
-					+ gdshader_function_specifier_keywords
-					+ gdshader_precision_modifiers
-					+ gdshader_uniform_qualifiers):
-			keyword_colors[k] = Color.ORCHID;
-		for k in gdshader_block_keywords:
-			keyword_colors[k] = Color.CORAL
-		for k in gdshader_builtins:
-			keyword_colors[k] = Color.DARK_TURQUOISE
-		member_variable_color = Color.LIGHT_BLUE
-		number_color = Color.AQUA
-		symbol_color = Color.GRAY
-#
-# and code completion
-#
-func _on_code_edit_code_completion_requested():
-	for k in gdshader_boolean_values:
-		code_editor.code_completion_prefixes.append(k)
-		code_editor.add_code_completion_option(CodeEdit.KIND_PLAIN_TEXT, k, k, Color.INDIAN_RED)
-	for k in (	gdshader_datatypes
-				+ gdshader_hints
-				+ gdshader_sampler_hints
-				+ gdshader_global_space_keywords
-				+ gdshader_function_specifier_keywords
-				+ gdshader_precision_modifiers
-				+ gdshader_uniform_qualifiers):
-		code_editor.code_completion_prefixes.append(k)
-		code_editor.add_code_completion_option(CodeEdit.KIND_CLASS, k, k, Color.ORCHID)
-	for k in gdshader_block_keywords:
-		code_editor.code_completion_prefixes.append(k)
-		code_editor.add_code_completion_option(CodeEdit.KIND_PLAIN_TEXT, k, k, Color.CORAL)
-	for k in gdshader_builtins:
-		code_editor.code_completion_prefixes.append(k)
-		code_editor.add_code_completion_option(CodeEdit.KIND_CONSTANT, k, k, Color.DARK_TURQUOISE)
-	for k in gdshader_builtin_functions + gdshader_sub_functions:
-		code_editor.code_completion_prefixes.append(k)
-		code_editor.add_code_completion_option(CodeEdit.KIND_FUNCTION, k, k+"(", Color.INDIAN_RED)
-	code_editor.update_code_completion_options(true)
-#
-# # # # # # # # # # # #
-
-func _camera_freeze():
-	Globals.camera_freeze = true
-
-func _camera_unfreeze():
-	Globals.camera_freeze = false
-
-func _ready():
-	code_editor.code_completion_enabled = true
-	code_editor.syntax_highlighter = ShaderSyntaxHighlighter.new()
-	for c in get_children():
-		c.connect("mouse_entered", _camera_freeze)
-		c.connect("mouse_exited", _camera_unfreeze)
-	update()
-
-func _input(event):
-	if event.is_action_pressed("apply_shader"):
-		_on_apply_shader_button_pressed()
-	elif event.is_action_pressed("save_shader"):
-		accept_event() # Event is now handled.
-		_on_save_shader_button_pressed()
-
-func _on_preset_options_item_selected(index):
-	selected_preset_name = preset_options.get_item_text(index)
-	Globals.shader = ShaderPresets.presets[selected_preset_name]
-	Globals.target_viewport.update()
-	update()
-	last_save_filepath = ""
-
-func update():
-	preset_options.clear()
-	# the following lines are weird af
-	var presets: Array[String] = []
-	var current_p_idx = 0
-	for p in ShaderPresets.presets:
-		presets.append(p)
-		if p == selected_preset_name:
-			current_p_idx = len(presets) - 1
-		preset_options.add_item(p)
-	preset_options.select(current_p_idx)
-	# weirdness ends here
-	code_editor.text = Globals.shader.code
-
-func _on_open_shader_button_pressed():
-	open_shader_dialog.show()
-
-func _on_save_shader_button_pressed():
-	if last_save_filepath == "":
-		save_shader_dialog.current_file = selected_preset_name + "_custom.gdshader"
-	else:
-		save_shader_dialog.current_path = last_save_filepath
-	save_shader_dialog.show()
-
-func _on_open_shader_dialog_file_selected(path):
-	var file = FileAccess.open(path, FileAccess.READ)
-	var shader_code = file.get_as_text()
-	var shader = Shader.new()
-	shader.code = shader_code
-	Globals.shader = shader
-	Globals.target_viewport.update()
-	update()
-	last_save_filepath = path
-
-func _on_save_shader_dialog_file_selected(path):
-	var file = FileAccess.open(path, FileAccess.WRITE)
-	var content = Globals.shader.code
-	file.store_string(content)
-	last_save_filepath = path
-
-func _on_apply_shader_button_pressed():
-	var shader = Shader.new()
-	shader.code = code_editor.text
-	Globals.shader = shader
-	Globals.target_viewport.update()

src/Filesystem.gd

@@ -0,0 +1,77 @@
+extends Node
+
+var cwd = "."
+
+var shader_path = "":
+	get():
+		return shader_path
+	set(v):
+		var old = shader_path
+		shader_path = v
+		if "/" in v: # update current working directory
+			cwd = v.substr(0, v.rfind("/"))
+		if old != shader_path:
+			store_last_opened_file()
+
+var shader: Shader:
+	get():
+		print("Load ", shader_path)
+		return load(shader_path)
+
+var original_image: ImageTexture
+
+var additional_images: Dictionary
+var result: Image
+
+var last_image_savepath = ""
+var last_original_image_path = ""
+
+func get_absolute_path(p: String) -> String:
+	# this only works on Linux!
+	if !p.begins_with("/"):
+		return self.cwd + "/" + p.lstrip("./")
+	return p
+
+func load_original_image(path: String) -> String: # returns an error message
+	print("Load ", path)
+	var img = Image.new()
+	var err = img.load(path)
+	if err == OK:
+		original_image = ImageTexture.create_from_image(img)
+		if self.last_image_savepath == "" or path != self.last_original_image_path:
+			self.last_image_savepath = path
+		self.last_original_image_path = path
+		return ""
+	return error_string(err) + " " + path
+
+func clear_additional_images():
+	additional_images.clear()
+
+func load_additional_image(key: String, path: String) -> String: # returns Error Message String
+	print("Load ", path)
+	var img = Image.new()
+	var err = img.load(path)
+	if err == OK:
+		additional_images[key] = ImageTexture.create_from_image(img)
+		return ""
+	else:
+		return error_string(err) + " " + path
+
+func save_result(path: String):
+	print("Export ", path)
+	var err = self.result.save_png(path)
+	if err != OK:
+		print("An error occured!")
+	else:
+		self.last_image_savepath = path
+
+func store_last_opened_file():
+	var f = FileAccess.open("user://last_opened", FileAccess.WRITE)
+	if f != null:
+		f.store_pascal_string(shader_path)
+		f.flush()
+
+func remember_last_opened_file():
+	var f = FileAccess.open("user://last_opened", FileAccess.READ)
+	if f != null:
+		shader_path = f.get_pascal_string()

src/Filesystem.gd.uid

@@ -0,0 +1 @@
+uid://rlb041ygdwol

src/Globals.gd

@@ -1,5 +0,0 @@
-extends Node
-
-var camera_freeze = false
-@onready var shader: Shader = ShaderPresets.presets[ShaderPresets.default_preset]
-var target_viewport: SubViewport

src/ImageCompositor.gd

@@ -0,0 +1,123 @@
+class_name ImageCompositor extends SubViewport
+
+var image_sprite: Sprite2D
+
+func _init() -> void:
+	# Overwrite some variables
+	self.render_target_update_mode = SubViewport.UPDATE_ALWAYS
+	self.disable_3d = true
+	self.transparent_bg = true
+	self.canvas_item_default_texture_filter = Viewport.DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_NEAREST
+	self.image_sprite = Sprite2D.new()
+
+@onready var camera = %Camera
+@onready var image_viewport_display = %ImageViewportDisplay
+
+func _ready() -> void:
+	# Add image sprite as child to be rendered
+	self.add_child(image_sprite)
+
+var _fragment_function_regex: RegEx = RegEx.create_from_string(r'\s*void\s+fragment\s*\(\s*\)\s*{\s*')
+
+func validate_shader_compilation(shader: Shader) -> bool:
+	# Inject code to validate shader compilation
+	var shader_code = shader.code;
+	# -> get position of fragment shader
+	var fragment_function_match = _fragment_function_regex.search(shader.code)
+	if fragment_function_match == null:
+		return false
+	# -> inject uniform
+	var uniform_name = "shader_compilation_validate_" + str(randi_range(999999999, 100000000))
+	var uniform_code_line = "\nuniform bool " + uniform_name + ";\n"
+	shader_code = shader_code.insert(fragment_function_match.get_start(), uniform_code_line)
+	# -> inject variable access to prevent that the uniform gets optimized away
+	shader_code = shader_code.insert(fragment_function_match.get_end() + len(uniform_code_line), "\n" + uniform_name + ";\n")
+	# apply shader code
+	shader.code = shader_code
+	# test if uniform list is empty -> if it is empty, the shader compilation failed
+	return len(shader.get_shader_uniform_list()) > 0
+
+func shader_has_uniform(shader: Shader, name: String, type: int) -> bool:
+	for u in shader.get_shader_uniform_list():
+		if u["name"] == name && u["type"] == type:
+			return true
+	return false
+
+func set_vsync(enabled: bool):
+	if enabled:
+		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_ENABLED)
+	else:
+		DisplayServer.window_set_vsync_mode(DisplayServer.VSYNC_DISABLED)
+
+func update(overwrite_image_path: String = "") -> Array: # returns error messages (strings)
+	var shader = Filesystem.shader # read from disk
+	if shader == null:
+		return ["No shader opened!"]
+	# get number of steps & check if code has STEP uniform
+	var steps: int = ShaderDirectiveParser.parse_steps_directive(shader.code)
+	var has_step_uniform: bool = shader_has_uniform(shader, "STEP", 2)
+	var has_steps_uniform: bool = shader_has_uniform(shader, "STEPS", 2)
+	# validate shader
+	if not validate_shader_compilation(shader):
+		return ["Shader compilation failed!"]
+	var errors = []
+	# load texture(s) from //!load directive -> TEXTURE
+	var original_image_path = ""
+	if overwrite_image_path == "":
+		var m = ShaderDirectiveParser.parse_load_directive(shader.code)
+		if len(m) < 1:
+			errors.append("Didn't find a load directive!")
+			return errors
+		original_image_path = Filesystem.get_absolute_path(m[1])
+	else:
+		original_image_path = overwrite_image_path
+	var fit_image = false
+	if original_image_path != Filesystem.last_original_image_path:
+		fit_image = true
+	var err = Filesystem.load_original_image(original_image_path)
+	if err != "":
+		errors.append(err)
+		image_viewport_display.hide()
+		return errors
+	# ... from //!load+ directives
+	Filesystem.clear_additional_images()
+	for n in ShaderDirectiveParser.parse_load_additional_directive(shader.code):
+		err = Filesystem.load_additional_image(n[1], Filesystem.get_absolute_path(n[2]))
+		if err != "":
+			errors.append(err)
+	if len(errors) > 0:
+		return errors
+	# apply textures
+	image_sprite.texture = Filesystem.original_image
+	image_sprite.offset = Filesystem.original_image.get_size() / 2
+	self.size = Filesystem.original_image.get_size()
+	# already show the image viewport & fit the image
+	if fit_image: camera.fit_image()
+	image_viewport_display.show()
+	# create shader material
+	var mat = ShaderMaterial.new()
+	mat.shader = shader
+	# add images as shader parameters
+	for key in Filesystem.additional_images:
+		mat.set_shader_parameter(
+			key, # uniform param name
+			Filesystem.additional_images[key])
+	# assign material
+	image_sprite.material = mat
+	# iterate n times
+	set_vsync(false) # speed up processing
+	if has_steps_uniform:
+		# set STEPS param
+		mat.set_shader_parameter("STEPS", steps)
+	for i in range(steps):
+		if has_step_uniform:
+			# set STEP param
+			mat.set_shader_parameter("STEP", i)
+		# Get viewport texture
+		await RenderingServer.frame_post_draw # wait for next frame to get drawn
+		Filesystem.result = get_texture().get_image()
+		image_sprite.texture = ImageTexture.create_from_image(Filesystem.result)
+	set_vsync(true) # reenable vsync
+	image_sprite.material = null
+	# done
+	return errors

src/ImageCompositor.gd.uid

@@ -0,0 +1 @@
+uid://d106170kuigl3

src/ImageViewport.gd

@@ -1,40 +0,0 @@
-extends SubViewport
-
-@onready var image_sprite = $ImageSprite
-
-var image_original_tex: ImageTexture
-var image_result: Image
-var load_uniform_regex: RegEx
-
-func _ready():
-	load_uniform_regex = RegEx.new()
-	load_uniform_regex.compile(r'\/\/!load\s(\w*)\s(.*)')
-
-func set_original_image(image: Image):
-	image_original_tex = ImageTexture.create_from_image(image)
-	image_sprite.texture = image_original_tex
-	image_sprite.offset = image_original_tex.get_size() / 2
-	size = image_original_tex.get_size()
-
-func update():
-	if image_original_tex != null:
-		image_sprite.texture = image_original_tex
-		var mat = ShaderMaterial.new()
-		mat.shader = Globals.shader
-		# load images from //!load directives and apply them to
-		# the material as shader parameters
-		for m in load_uniform_regex.search_all(Globals.shader.code):
-			var u_image = Image.load_from_file(m.strings[2])
-			mat.set_shader_parameter(
-				m.strings[1], # uniform param name
-				ImageTexture.create_from_image(u_image))
-		# assign material
-		image_sprite.material = mat
-		# Get viewport texture
-		await RenderingServer.frame_post_draw # for good measure
-		image_result = get_texture().get_image()
-		image_sprite.material = null
-		image_sprite.texture = ImageTexture.create_from_image(image_result)
-
-func get_result():
-	return image_result

src/ImageViewportDisplay.gd

@@ -1,9 +1,10 @@
 extends Sprite2D
 
-@onready var camera = get_parent().get_node("Camera")
+func _ready() -> void:
+	hide()
 
-func _process(_delta):
-	if camera.zoom.x >= 1.5:
+func update_zoom_texture_filter(zoom: Vector2):
+	if zoom.x >= 1.5:
 		texture_filter = TEXTURE_FILTER_NEAREST_WITH_MIPMAPS
 	else:
 		texture_filter = TEXTURE_FILTER_LINEAR

src/ImageViewportDisplay.gd.uid

@@ -0,0 +1 @@
+uid://ctc4lhbdsoq7u

src/Main.gd

@@ -1,37 +1,126 @@
-extends Node2D
+extends Node
 
-@onready var camera = $Camera
-@onready var image_viewport = $ImageViewport
-@onready var ui_container = $UI_Layer/UserInterfaceContainer
-@onready var ui_control_fileopen = $UI_Layer/UserInterfaceContainer/OpenImageDialog
-@onready var ui_control_filesave = $UI_Layer/UserInterfaceContainer/SaveImageDialog
-var last_save_filepath = ""
+const BATCH_MODE_SUPPORTED_EXTS = [
+	".bmp", ".dds", ".exr", ".hdr", ".jpeg", ".jpg", ".ktx", ".png", ".svg", ".webp"
+]
+
+@onready var app_name = ProjectSettings.get_setting("application/config/name")
+
+func show_help():
+	print(
+		"Usage:\n\n",
+		"./Fragmented <command> <args...>\n\n",
+		"Commands:\n\n",
+		" help\n\n",
+		"  | Shows this help text.\n\n",
+		" apply --shader PATH [--load-image PATH]\n\n",
+		"  | Applies a shader file.\n\n",
+		"    --shader PATH      The path to the shader\n",
+		"    --output PATH      Where to write the resulting image to.\n",
+		"                       In batch mode, this must be a folder.\n",
+		"    --load-image PATH  The path to the image. This will overwrite the\n",
+		"                       load directive of the shader file.\n",
+		"                       Passing a folder activates batch mode.\n",
+		"                       (optional)\n")
+
+func parse_custom_cmdline(args: PackedStringArray):
+	var kwargs: Dictionary = {"--shader": null, "--output": null, "--load-image": null}
+	var args_len = args.size()
+	var i = 0
+	while i < args_len:
+		var a = args[i]
+		if a in kwargs && args_len > i+1:
+			i += 1
+			kwargs[a] = args[i]
+		i += 1
+	return kwargs
+
+func cli_handle_errors(errors: Array) -> int:
+	# returns number of errors
+	var n_errors = errors.size()
+	if n_errors > 0:
+		print("One or more errors occurred.")
+		for e in errors:
+			printerr(e)
+	return n_errors
+
+func cli(args: PackedStringArray):
+	print(
+		"~ Fragmented CLI ~\n",
+		"-================-\n")
+	if "help" in args:
+		show_help()
+		get_tree().quit(1)
+		return
+	var kwargs: Dictionary = parse_custom_cmdline(args)
+	if kwargs["--shader"] == null or kwargs["--output"] == null:
+		show_help()
+		get_tree().quit(1)
+		return
+	var batch_mode = false
+	var load_image_dir: DirAccess
+	if kwargs["--load-image"] != null:
+		load_image_dir = DirAccess.open(kwargs["--load-image"])
+		if load_image_dir != null:
+			# batch mode
+			if DirAccess.open(kwargs["--output"]) == null:
+				printerr("If --load-image is a directory, --output has to be one too.\n")
+				show_help()
+				get_tree().quit(1)
+				return
+			else:
+				batch_mode = true
+	#
+	Filesystem.shader_path = kwargs["--shader"]
+	#
+	if batch_mode:
+		var in_dir_path = load_image_dir.get_current_dir()
+		var out_dir_path: String = kwargs["--output"].rstrip("/")
+		for f in load_image_dir.get_files():
+			var supported = false
+			for e in BATCH_MODE_SUPPORTED_EXTS:
+				if f.ends_with(e):
+					supported = true
+					break
+			if supported:
+				f = in_dir_path + "/" + f
+				print(f)
+				var errors = await $Compositor.update(f)
+				if cli_handle_errors(errors) == 0:
+					var filename = out_dir_path + "/" + f.substr(f.rfind("/"), -1)
+					Filesystem.save_result(filename)
+				else:
+					get_tree().quit(1)
+					return
+		get_tree().quit(0)
+	else:
+		var errors = []
+		if kwargs["--load-image"] == null:
+			errors = await $Compositor.update()
+		else:
+			errors = await $Compositor.update(kwargs["--load-image"])
+		if cli_handle_errors(errors) == 0:
+			Filesystem.save_result(kwargs["--output"])
+			get_tree().quit(0)
+		else:
+			get_tree().quit(1)
+
+func prepare_gui():
+	update_title()
+	# Load last opened file
+	Filesystem.remember_last_opened_file()
+	%MainUI._on_apply_shader_button_pressed()
 
 func _ready():
-	Globals.target_viewport = image_viewport
-
-func _on_open_image_button_pressed():
-	ui_control_fileopen.show()
-
-func _on_open_image_dialog_file_selected(path):
-	var img = Image.new()
-	var err = img.load(path)
-	if err == OK:
-		image_viewport.set_original_image(img)
-		image_viewport.update()
-		camera.fit_image()
-		last_save_filepath = path
+	var args = OS.get_cmdline_args()
+	if len(args) > 0 and args[0] in ["apply", "help"]:
+		# use the commandline interface
+		cli(args)
 	else:
-		print("An error occured!")
+		prepare_gui()
 
-func _on_save_image_button_pressed():
-	if image_viewport.get_result() != null:
-		ui_control_filesave.current_path = last_save_filepath
-		ui_control_filesave.show()
-
-func _on_save_image_dialog_file_selected(path):
-	var err = image_viewport.get_result().save_png(path)
-	if err != OK:
-		print("An error occured!")
+func update_title(current_file: String = ""):
+	if current_file == "":
+		get_window().title = app_name + " - Viewer"
 	else:
-		last_save_filepath = path
+		get_window().title = current_file + " - " + app_name + " - Viewer"

src/Main.gd.uid

@@ -0,0 +1 @@
+uid://5sbslwysin5a

src/MainUI.gd

@@ -0,0 +1,100 @@
+extends Control
+
+@onready var open_shader_dialog = %OpenShaderDialog
+@onready var save_image_dialog = %SaveImageDialog
+
+@onready var open_shader_button = %OpenShaderButton
+@onready var save_image_button = %SaveImageButton
+@onready var fit_image_button = %FitImageButton
+@onready var apply_shader_button = %ApplyShaderButton
+
+@onready var status_indicator = %StatusIndicator
+@onready var error_msg_dialog = %ErrorMessageDialog
+
+@onready var main = get_tree().root.get_node("Main")
+@onready var compositor = %Compositor
+@onready var camera = %Camera
+
+var status_okay_texture: CompressedTexture2D = preload("uid://m1omb6g45vst")
+var status_error_texture: CompressedTexture2D = preload("uid://04iv1gogpuhu")
+
+enum Status {OKAY, ERROR, UNKNOWN = -1}
+
+#
+
+func _input(event):
+	if event.is_action_pressed("apply_shader"):
+		_on_apply_shader_button_pressed()
+	elif event.is_action_pressed("save_shader"):
+		accept_event() # Event is now handled.
+
+#
+
+func set_buttons_disabled(disabled: bool):
+	for b in [open_shader_button, save_image_button, fit_image_button, apply_shader_button, status_indicator]:
+		b.disabled = disabled
+
+func _on_open_shader_button_pressed():
+	set_buttons_disabled(true)
+	open_shader_dialog.show()
+
+func _on_fit_image_button_pressed():
+	camera.fit_image()
+
+func _on_apply_shader_button_pressed():
+	set_buttons_disabled(true)
+	var errors = await compositor.update()
+	set_buttons_disabled(false)
+	if len(errors) > 0:
+		update_status(Status.ERROR, "\n".join(errors))
+	else:
+		update_status(Status.OKAY)
+		status_indicator.disabled = true
+
+func _on_save_image_button_pressed():
+	if Filesystem.result != null:
+		set_buttons_disabled(true)
+		save_image_dialog.current_path = Filesystem.last_image_savepath
+		save_image_dialog.show()
+
+#
+
+func _on_open_shader_dialog_file_selected(path: String):
+	Filesystem.shader_path = path
+	main.update_title(path.split("/")[-1])
+	self._on_apply_shader_button_pressed()
+
+func _on_open_shader_dialog_canceled() -> void:
+	set_buttons_disabled(false)
+
+func _on_open_shader_dialog_confirmed() -> void:
+	set_buttons_disabled(false)
+
+func _on_save_image_dialog_file_selected(path):
+	Filesystem.save_result(path)
+	set_buttons_disabled(false)
+
+func _on_save_image_dialog_canceled() -> void:
+	set_buttons_disabled(false)
+
+func _on_save_image_dialog_confirmed() -> void:
+	set_buttons_disabled(false)
+
+#
+
+func update_status(status: Status, msg: String = ""):
+	error_msg_dialog.dialog_text = msg
+	error_msg_dialog.reset_size()
+	if status == Status.OKAY:
+		status_indicator.texture_normal = status_okay_texture
+	elif status == Status.ERROR:
+		status_indicator.texture_normal = status_error_texture
+	else:
+		status_indicator.texture_normal = null
+	if msg == "":
+		status_indicator.disabled = true
+	else:
+		status_indicator.disabled = false
+
+func _on_status_indicator_pressed() -> void:
+	error_msg_dialog.show()

src/MainUI.gd.uid

@@ -0,0 +1 @@
+uid://bxgmf2ny7yuc8

src/ShaderDirectiveParser.gd

@@ -0,0 +1,24 @@
+extends Node
+
+var _load_regex: RegEx = RegEx.create_from_string(r'\/\/!load\s(.*)')
+var _load_additional_regex: RegEx = RegEx.create_from_string(r'\/\/!load\+\s(\w*)\s(.*)')
+var _iterate_regex: RegEx = RegEx.create_from_string(r'\/\/!steps\s([0-9]+)\s*')
+
+func parse_load_directive(shader_code: String) -> PackedStringArray:
+	var regex_match = self._load_regex.search(shader_code)
+	if regex_match == null:
+		return []
+	return regex_match.strings
+
+func parse_load_additional_directive(shader_code: String) -> Array[PackedStringArray]:
+	var results : Array[PackedStringArray] = []
+	for m in self._load_additional_regex.search_all(shader_code):
+		results.append(m.strings)
+	return results
+
+func parse_steps_directive(shader_code: String) -> int:
+	var regex_match = self._iterate_regex.search(shader_code)
+	if regex_match == null:
+		return 1
+	else:
+		return max(0, int(regex_match.strings[1]))

src/ShaderDirectiveParser.gd.uid

@@ -0,0 +1 @@
+uid://dw8bep14j4j3w

src/UIAppVersion.gd

@@ -1,4 +0,0 @@
-extends Label
-
-func _ready():
-	text = ProjectSettings.get_setting("application/config/version")

src/VersionLabel.gd

@@ -0,0 +1,8 @@
+extends Label
+
+func _ready():
+	text = ProjectSettings.get_setting("application/config/name") \
+		+ " " \
+		+ ProjectSettings.get_setting("application/config/version") \
+		+ " | Godot " \
+		+ Engine.get_version_info()["string"]

src/VersionLabel.gd.uid

@@ -0,0 +1 @@
+uid://bh0gpu3i2p47f

src/assets/bg.png.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://d2nwchyd6huob"
+path="res://.godot/imported/bg.png-7c8713dd1fab321784216191fa747e53.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://src/assets/bg.png"
+dest_files=["res://.godot/imported/bg.png-7c8713dd1fab321784216191fa747e53.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1

src/assets/error.svg

@@ -0,0 +1,80 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="30"
+   height="30"
+   viewBox="0 0 30 30"
+   version="1.1"
+   id="svg5"
+   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   sodipodi:docname="error.svg"
+   inkscape:export-filename="error.svg"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview7"
+     pagecolor="#505050"
+     bordercolor="#ffffff"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="1"
+     inkscape:deskcolor="#505050"
+     inkscape:document-units="px"
+     showgrid="true"
+     inkscape:zoom="22.627417"
+     inkscape:cx="12.28598"
+     inkscape:cy="16.108776"
+     inkscape:window-width="1854"
+     inkscape:window-height="1011"
+     inkscape:window-x="66"
+     inkscape:window-y="32"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1">
+    <inkscape:grid
+       type="xygrid"
+       id="grid9"
+       originx="0"
+       originy="0" />
+  </sodipodi:namedview>
+  <defs
+     id="defs2">
+    <rect
+       x="-19.109422"
+       y="15.119667"
+       width="23.697131"
+       height="28.949477"
+       id="rect4519" />
+  </defs>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <path
+       style="display:none;opacity:0.75;fill:#ff3815;fill-opacity:1;stroke:#ff3815;stroke-width:6;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1"
+       d="M 4,25 H 26 L 15,6 Z"
+       id="path11345"
+       sodipodi:nodetypes="cccc" />
+    <circle
+       style="opacity:0.75;fill:#ff3815;fill-opacity:1;stroke:none;stroke-width:6;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1;paint-order:normal"
+       id="path15121"
+       cx="15"
+       cy="15"
+       r="13" />
+    <g
+       aria-label="!"
+       transform="matrix(0.80238423,0,0,0.80238423,20.811527,-5.9033718)"
+       id="text4517"
+       style="font-size:24px;white-space:pre;shape-inside:url(#rect4519);display:inline;fill:#ffffff;fill-opacity:1">
+      <path
+         d="m -5.6133052,29.164717 h -3.264 L -9.5630195,16.081288 h 4.6354286 z m -4.0045715,4.580571 q 0,-1.261715 0.6857143,-1.755429 0.6857143,-0.521142 1.6731429,-0.521142 0.96,0 1.6457143,0.521142 0.6857143,0.493714 0.6857143,1.755429 0,1.206857 -0.6857143,1.755429 -0.6857143,0.521142 -1.6457143,0.521142 -0.9874286,0 -1.6731429,-0.521142 -0.6857143,-0.548572 -0.6857143,-1.755429 z"
+         style="font-weight:bold;-inkscape-font-specification:'sans-serif Bold';text-align:center;text-anchor:middle;fill:#ffffff;fill-opacity:1;stroke-width:1.14286"
+         id="path4674" />
+    </g>
+  </g>
+</svg>

src/assets/error.svg.import

@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://04iv1gogpuhu"
+path="res://.godot/imported/error.svg-28fb29635cf59d39cabf7052619f602f.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://src/assets/error.svg"
+dest_files=["res://.godot/imported/error.svg-28fb29635cf59d39cabf7052619f602f.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=2.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

src/assets/icon.png.import

@@ -3,15 +3,15 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://kqwc4avs2xdp"
-path="res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.ctex"
+path="res://.godot/imported/icon.png-d8298ab6eda392a806be6bb7eec65b9c.ctex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://icon.png"
-dest_files=["res://.godot/imported/icon.png-487276ed1e3a0c39cad0279d744ee560.ctex"]
+source_file="res://src/assets/icon.png"
+dest_files=["res://.godot/imported/icon.png-d8298ab6eda392a806be6bb7eec65b9c.ctex"]
 
 [params]
 

src/assets/okay.svg

@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   width="30"
+   height="30"
+   viewBox="0 0 30 30"
+   version="1.1"
+   id="svg5"
+   inkscape:version="1.2.2 (b0a8486541, 2022-12-01)"
+   sodipodi:docname="success.svg"
+   inkscape:export-filename="error.svg"
+   inkscape:export-xdpi="96"
+   inkscape:export-ydpi="96"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <sodipodi:namedview
+     id="namedview7"
+     pagecolor="#505050"
+     bordercolor="#ffffff"
+     borderopacity="1"
+     inkscape:showpageshadow="0"
+     inkscape:pageopacity="0"
+     inkscape:pagecheckerboard="1"
+     inkscape:deskcolor="#505050"
+     inkscape:document-units="px"
+     showgrid="true"
+     inkscape:zoom="22.627417"
+     inkscape:cx="3.314563"
+     inkscape:cy="14.385204"
+     inkscape:window-width="1854"
+     inkscape:window-height="1011"
+     inkscape:window-x="66"
+     inkscape:window-y="32"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="layer1">
+    <inkscape:grid
+       type="xygrid"
+       id="grid9"
+       originx="0"
+       originy="0" />
+  </sodipodi:namedview>
+  <defs
+     id="defs2">
+    <rect
+       x="0"
+       y="0"
+       width="30"
+       height="30"
+       id="rect15390" />
+    <rect
+       x="-19.109422"
+       y="15.119667"
+       width="23.697131"
+       height="28.949477"
+       id="rect4519" />
+  </defs>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <path
+       style="display:none;opacity:0.75;fill:#ff3815;fill-opacity:1;stroke:#ff3815;stroke-width:6;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1"
+       d="M 4,25 H 26 L 15,6 Z"
+       id="path11345"
+       sodipodi:nodetypes="cccc" />
+    <circle
+       style="opacity:0.75;fill:#15ff1e;fill-opacity:1;stroke:none;stroke-width:6;stroke-linejoin:round;stroke-dasharray:none;stroke-opacity:1;paint-order:normal"
+       id="path15121"
+       cx="15"
+       cy="15"
+       r="13" />
+    <path
+       style="opacity:1;fill:none;fill-opacity:1;stroke:#ffffff;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;stroke-dasharray:none;stroke-opacity:1"
+       d="m 8.1284306,14.403599 5.2374004,4.840883 8.39167,-9.6564053"
+       id="path20589"
+       sodipodi:nodetypes="ccc" />
+  </g>
+</svg>

src/assets/okay.svg.import

@@ -0,0 +1,37 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://m1omb6g45vst"
+path="res://.godot/imported/okay.svg-de66a022ef37753b085371b7c60aefd1.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://src/assets/okay.svg"
+dest_files=["res://.godot/imported/okay.svg-de66a022ef37753b085371b7c60aefd1.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=2.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

src/presets/Presets.gd

@@ -1,14 +0,0 @@
-extends Node
-
-const dir = "res://src/presets/shaders/"
-
-@onready var presets = {
-	"Empty": load(dir + "empty.gdshader"),
-	"Greyscale": load(dir + "greyscale.gdshader"),
-	"Lowpass": load(dir + "lowpass.gdshader"),
-	"Channel Offset": load(dir + "channel_offset.gdshader"),
-	"RGB -> UV Distort": load(dir + "rgb_uv_distort.gdshader"),
-	"Mix": load(dir + "mix.gdshader")
-}
-
-var default_preset: String = "Empty"

src/presets/shaders/empty.gdshader

@@ -1,5 +0,0 @@
-shader_type canvas_item;
-
-void fragment() {
-	// Called for every pixel the material is visible on.
-}

src/presets/shaders/lowpass.gdshader

@@ -1,13 +0,0 @@
-shader_type canvas_item;
-
-// Settings
-const float threshold = 0.5;
-//
-
-void fragment() {
-	vec4 tex = texture(TEXTURE , UV);
-	COLOR.r = min(tex.r, threshold);
-	COLOR.g = min(tex.g, threshold);
-	COLOR.b = min(tex.b, threshold);
-	COLOR.a = tex.a;
-}

src/presets/shaders/mix.gdshader

@@ -1,8 +0,0 @@
-shader_type canvas_item;
-
-//!load img2 ./icon.png
-uniform sampler2D img2: repeat_enable, filter_nearest;
-
-void fragment() {
-	COLOR = mix(COLOR, texture(img2, UV), .5);
-}

src/presets/shaders/rgb_uv_distort.gdshader

@@ -1,11 +0,0 @@
-shader_type canvas_item;
-
-const float strength = 0.1;
-
-void fragment() {
-	vec2 uv = UV;
-	float b = (COLOR.r + COLOR.g + COLOR.b) / 3.0;
-	uv.x = mix(uv.x, b, strength);
-	uv.y = mix(uv.y, b, strength);
-	COLOR = texture(TEXTURE, uv);
-}