shaderlib: Add smart_denoise function, add example, move example images into separate folder; implements #29

README.md

@@ -68,7 +68,7 @@ shader_type canvas_item;
 
 #include "res://shaderlib/hsv.gdshaderinc"
 
-//!load ./swamp.jpg
+//!load ./examples/images/swamp.jpg
 
 void fragment() {
 	COLOR = hsv_offset(COLOR, 0.32, 0.2, 0.0);

examples/channel_offset.gdshader

@@ -1,6 +1,6 @@
 shader_type canvas_item;
 
-//!load ./swamp.jpg
+//!load ./images/swamp.jpg
 
 const vec2 offset_r = vec2(-0.002, -0.002);
 const vec2 offset_g = vec2(0., 0.);

examples/color_and_pixelate.gdshader

@@ -3,7 +3,7 @@ shader_type canvas_item;
 #include "res://shaderlib/hsv.gdshaderinc"
 #include "res://shaderlib/effects.gdshaderinc"
 
-//!load ./swamp.jpg
+//!load ./images/swamp.jpg
 
 void fragment() {
 	COLOR = pixelate(TEXTURE, UV, 200.0);

examples/denoise.gdshader

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

examples/greyscale.gdshader

@@ -1,6 +1,6 @@
 shader_type canvas_item;
 
-//!load ./swamp.jpg
+//!load ./images/swamp.jpg
 
 void fragment() {
 	float b = (COLOR.r + COLOR.g + COLOR.b) / 3.0;

examples/images/grass.png.import

@@ -3,15 +3,15 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://c1mh1d2f3u4ju"
-path="res://.godot/imported/grass.png-30af7213ed2d70b810b4ae788314a9e9.ctex"
+path="res://.godot/imported/grass.png-61a458998da568ce60ccb8a0c7caaf6d.ctex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://examples/grass.png"
-dest_files=["res://.godot/imported/grass.png-30af7213ed2d70b810b4ae788314a9e9.ctex"]
+source_file="res://examples/images/grass.png"
+dest_files=["res://.godot/imported/grass.png-61a458998da568ce60ccb8a0c7caaf6d.ctex"]
 
 [params]
 

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

@@ -3,15 +3,15 @@
 importer="texture"
 type="CompressedTexture2D"
 uid="uid://ckjb0agn5btv7"
-path="res://.godot/imported/swamp.jpg-8e3eac7e7aacce65638e712310cdb35c.ctex"
+path="res://.godot/imported/swamp.jpg-1dfdcd52a5ef03d42a82a7f06acefa98.ctex"
 metadata={
 "vram_texture": false
 }
 
 [deps]
 
-source_file="res://examples/swamp.jpg"
-dest_files=["res://.godot/imported/swamp.jpg-8e3eac7e7aacce65638e712310cdb35c.ctex"]
+source_file="res://examples/images/swamp.jpg"
+dest_files=["res://.godot/imported/swamp.jpg-1dfdcd52a5ef03d42a82a7f06acefa98.ctex"]
 
 [params]
 

examples/lowpass.gdshader

@@ -1,6 +1,6 @@
 shader_type canvas_item;
 
-//!load ./swamp.jpg
+//!load ./images/swamp.jpg
 
 // Settings
 const float threshold = 0.6;

examples/multistep_distort.gdshader

@@ -1,7 +1,7 @@
 shader_type canvas_item;
 
 //!steps 9
-//!load ./swamp.jpg
+//!load ./images/swamp.jpg
 
 const float strength = 0.01;
 

examples/place_texture.gdshader

@@ -3,8 +3,8 @@ shader_type canvas_item;
 #include "res://shaderlib/transform.gdshaderinc"
 #include "res://shaderlib/transparency.gdshaderinc"
 
-//!load ./swamp.jpg
-//!load+ img2 ./grass.png
+//!load ./images/swamp.jpg
+//!load+ img2 ./images/grass.png
 
 uniform sampler2D img2: repeat_disable, filter_nearest;
 

shaderlib/denoise.gdshaderinc

@@ -0,0 +1,66 @@
+
+/* 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;
+}

src/Editor.gd

@@ -132,13 +132,15 @@ var shaderlib_regex = {
 	"hsv": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/hsv\.gdshaderinc\"'),
 	"transform": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/transform\.gdshaderinc\"'),
 	"transparency": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/transparency\.gdshaderinc\"'),
-	"effects": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/effects\.gdshaderinc\"')
+	"effects": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/effects\.gdshaderinc\"'),
+	"denoise": RegEx.create_from_string(r'\s*\#include\s+\"res\:\/\/shaderlib\/denoise\.gdshaderinc\"')
 }
 const shaderlib_functions = {
 	"hsv": ["rgb2hsv", "hsv2rgb", "hsv_offset", "hsv_multiply"],
 	"transform": ["place_texture"],
 	"transparency": ["alpha_blend"],
-	"effects": ["pixelate"]
+	"effects": ["pixelate"],
+	"denoise": ["smart_denoise"]
 }
 #
 # configure Highlighter