README.md

@@ -13,23 +13,32 @@ You can find the latest releases [here](https://github.com/ChaoticByte/Fragmente
 
 ## 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.
+The repo includes examples. You can use them as a starting-point to write your own filters.  
+Just load an image using `//!load`, edit the shader code and hit `F5` to see the changes.
 
-### Load additional images using the `//!load` directive
+### Load TEXTURE using the `//!load` directive
+
+```glsl
+//!load <filepath>
+```
+
+The image file will be read and available as the `TEXTURE` variable.
+
+#### 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 `mix.gdshader` example:
 
 ```glsl
 shader_type canvas_item;
 
-//!load img2 ./icon.png
+//!load ./example1.png
+
+//!load+ img2 ./example2.jpg
 uniform sampler2D img2: repeat_enable, filter_nearest;
 
 void fragment() {

examples/CREDITS.md

@@ -0,0 +1,5 @@
+
+# Example Images
+
+- swamp.jpg by [clfr21](https://pixabay.com/de/users/clfr21-6530007/)
+- overlay.jpg by [Humusak](https://pixabay.com/de/users/humusak-137455/)

examples/channel_offset.gdshader

@@ -1,5 +1,7 @@
 shader_type canvas_item;
 
+//!load ./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/greyscale.gdshader

@@ -1,10 +1,10 @@
 shader_type canvas_item;
 
+//!load ./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/lowpass.gdshader

@@ -1,5 +1,7 @@
 shader_type canvas_item;
 
+//!load ./swamp.jpg
+
 // Settings
 const float threshold = 0.5;
 //

examples/mix.gdshader

@@ -1,8 +1,10 @@
 shader_type canvas_item;
 
-//!load img2 ./icon.png
+//!load ./swamp.jpg
+
+//!load+ img2 ./overlay.jpg
 uniform sampler2D img2: repeat_enable, filter_nearest;
 
 void fragment() {
-	COLOR = mix(COLOR, texture(img2, UV), .5);
+	COLOR = mix(COLOR, texture(img2, UV), .2);
 }

examples/overlay.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://8101nnc8cx4o"
+path="res://.godot/imported/overlay.jpg-b6d13e0def59877969c9eda02fa4244e.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://examples/overlay.jpg"
+dest_files=["res://.godot/imported/overlay.jpg-b6d13e0def59877969c9eda02fa4244e.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/rgb_uv_distort.gdshader

@@ -1,5 +1,7 @@
 shader_type canvas_item;
 
+//!load ./swamp.jpg
+
 const float strength = 0.1;
 
 void fragment() {

examples/swamp.jpg.import

@@ -0,0 +1,34 @@
+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://ckjb0agn5btv7"
+path="res://.godot/imported/swamp.jpg-8e3eac7e7aacce65638e712310cdb35c.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://examples/swamp.jpg"
+dest_files=["res://.godot/imported/swamp.jpg-8e3eac7e7aacce65638e712310cdb35c.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

project.godot

@@ -27,6 +27,7 @@ window/size/viewport_width=1280
 window/size/viewport_height=720
 window/size/mode=2
 window/energy_saving/keep_screen_on=false
+window/vsync/vsync_mode=0
 
 [editor_plugins]
 
@@ -69,4 +70,5 @@ save_shader={
 renderer/rendering_method="mobile"
 textures/vram_compression/import_etc2_astc=true
 textures/lossless_compression/force_png=true
+shader_compiler/shader_cache/enabled=false
 environment/defaults/default_clear_color=Color(0, 0, 0, 1)

scenes/main.tscn

@@ -2,7 +2,7 @@
 
 [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="Script" path="res://src/ImageViewportDisplay.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"]
@@ -18,6 +18,7 @@ shader = ExtResource("4_ty3qx")
 script = ExtResource("1_2625y")
 
 [node name="ImageViewport" type="SubViewport" parent="."]
+unique_name_in_owner = true
 disable_3d = true
 transparent_bg = true
 canvas_item_default_texture_filter = 0
@@ -25,8 +26,10 @@ render_target_update_mode = 4
 script = ExtResource("2_hvo65")
 
 [node name="ImageSprite" type="Sprite2D" parent="ImageViewport"]
+unique_name_in_owner = true
 
 [node name="ImageViewportDisplay" type="Sprite2D" parent="."]
+unique_name_in_owner = true
 texture = SubResource("ViewportTexture_lct1c")
 script = ExtResource("3_n4itb")
 
@@ -42,6 +45,7 @@ grow_vertical = 2
 focus_mode = 2
 
 [node name="UserInterfaceContainer" type="Control" parent="UI_Layer"]
+unique_name_in_owner = true
 layout_mode = 3
 anchor_right = 0.225
 anchor_bottom = 1.0
@@ -82,60 +86,6 @@ 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
@@ -150,8 +100,9 @@ grow_vertical = 2
 script = ExtResource("7_g8bap")
 
 [node name="OpenShaderDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer/Editor"]
+unique_name_in_owner = true
 title = "Load Shader"
-size = Vector2i(521, 159)
+size = Vector2i(521, 175)
 ok_button_text = "Open"
 mode_overrides_title = false
 file_mode = 0
@@ -160,28 +111,27 @@ filters = PackedStringArray("*.gdshader")
 use_native_dialog = true
 
 [node name="SaveShaderDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer/Editor"]
+unique_name_in_owner = true
 title = "Save Shader"
-size = Vector2i(661, 159)
+size = Vector2i(661, 175)
 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="SaveImageDialog" type="FileDialog" parent="UI_Layer/UserInterfaceContainer/Editor"]
+unique_name_in_owner = true
+title = "Export Image"
+size = Vector2i(661, 175)
+ok_button_text = "Save"
+mode_overrides_title = false
+access = 2
+filters = PackedStringArray("*.png")
+use_native_dialog = true
 
 [node name="CodeEdit" type="CodeEdit" parent="UI_Layer/UserInterfaceContainer/Editor"]
+unique_name_in_owner = true
 layout_mode = 1
 anchors_preset = 15
 anchor_right = 1.0
@@ -207,48 +157,55 @@ 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_right = 56.0
 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_left = 64.0
+offset_right = 120.0
 offset_bottom = 32.0
-grow_horizontal = 0
 text = "Save"
 
 [node name="ApplyShaderButton" type="Button" parent="UI_Layer/UserInterfaceContainer/Editor"]
 layout_mode = 1
+offset_left = 128.0
+offset_right = 216.0
+offset_bottom = 32.0
+text = "Apply (F5)"
+
+[node name="SaveImageButton" 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_left = -120.0
 offset_bottom = 32.0
 grow_horizontal = 0
-text = "Apply (F5)"
+text = "Export Image"
+
+[node name="FitImageButton" 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 = -128.0
+offset_bottom = 32.0
+grow_horizontal = 0
+text = "Fit Image"
 
 [node name="Camera" type="Camera2D" parent="."]
+unique_name_in_owner = true
 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="file_selected" from="UI_Layer/UserInterfaceContainer/Editor/SaveImageDialog" to="." method="_on_save_image_dialog_file_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"]
+[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/Editor/SaveImageButton" to="." method="_on_save_image_button_pressed"]
+[connection signal="pressed" from="UI_Layer/UserInterfaceContainer/Editor/FitImageButton" to="Camera" method="_on_fit_image_button_pressed"]

src/Camera.gd

@@ -2,8 +2,9 @@ extends Camera2D
 
 var drag = false
 
-@onready var user_interface_container = get_parent().get_node("UI_Layer/UserInterfaceContainer")
-@onready var image_viewport = get_parent().get_node("ImageViewport")
+@onready var user_interface_container = %UserInterfaceContainer
+@onready var image_viewport = %ImageViewport
+@onready var image_viewport_display = %ImageViewportDisplay
 
 func _input(event):
 	if event.is_action_pressed("zoom_out") && !Globals.camera_freeze:
@@ -32,11 +33,13 @@ func zoom_in():
 	var old_mouse_pos = get_global_mouse_position()
 	zoom *= 1.2
 	global_position += old_mouse_pos - get_global_mouse_position()
+	image_viewport_display.update_zoom_texture_filter(zoom)
 
 func zoom_out():
 	var old_mouse_pos = get_global_mouse_position()
 	zoom *= 1/1.2
 	global_position += old_mouse_pos - get_global_mouse_position()
+	image_viewport_display.update_zoom_texture_filter(zoom)
 
 func _on_fit_image_button_pressed():
 	fit_image()

src/Editor.gd

@@ -1,11 +1,8 @@
 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 = ""
+@onready var code_editor = %CodeEdit
+@onready var open_shader_dialog = %OpenShaderDialog
+@onready var save_shader_dialog = %SaveShaderDialog
 
 # # # # # # # # # # #
 # GDShader keywords #
@@ -189,35 +186,17 @@ func _input(event):
 		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"
+	if Globals.last_shader_savepath == "":
+		save_shader_dialog.current_file = "shader.gdshader"
 	else:
-		save_shader_dialog.current_path = last_save_filepath
+		save_shader_dialog.current_path = Globals.last_shader_savepath
 	save_shader_dialog.show()
 
 func _on_open_shader_dialog_file_selected(path: String):
@@ -231,7 +210,7 @@ func _on_open_shader_dialog_file_selected(path: String):
 		Globals.cwd = path.substr(0, path.rfind("/"))
 	Globals.target_viewport.update()
 	update()
-	last_save_filepath = path
+	Globals.last_shader_savepath = path
 
 func _on_save_shader_dialog_file_selected(path):
 	print("Save ", path)
@@ -240,7 +219,7 @@ func _on_save_shader_dialog_file_selected(path):
 	file.store_string(content)
 	if "/" in path: # update current working directory
 		Globals.cwd = path.substr(0, path.rfind("/"))
-	last_save_filepath = path
+	Globals.last_shader_savepath = path
 
 func _on_apply_shader_button_pressed():
 	var shader = Shader.new()

src/Globals.gd

@@ -1,6 +1,8 @@
 extends Node
 
 var camera_freeze = false
-@onready var shader: Shader = ShaderPresets.presets[ShaderPresets.default_preset]
+@onready var shader: Shader = load("res://src/shaders/empty.gdshader")
 var target_viewport: SubViewport
 var cwd = "."
+var last_image_savepath = ""
+var last_shader_savepath = ""

src/ImageViewport.gd

@@ -1,46 +1,71 @@
 extends SubViewport
 
-@onready var image_sprite = $ImageSprite
+@onready var camera = %Camera
+@onready var image_sprite = %ImageSprite
 
 var image_original_tex: ImageTexture
 var image_result: Image
-var load_uniform_regex: RegEx
+var load_regex: RegEx
+var load_additional_regex: RegEx
+var last_tex_path = ""
 
 func _ready():
-	load_uniform_regex = RegEx.new()
-	load_uniform_regex.compile(r'\/\/!load\s(\w*)\s(.*)')
+	load_regex = RegEx.new()
+	load_additional_regex = RegEx.new()
+	load_regex.compile(r'\/\/!load\s(.*)')
+	load_additional_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 load_texture(path):
+	print("Load ", path)
+	var img = Image.new()
+	var err = img.load(path)
+	if err == OK:
+		image_original_tex = ImageTexture.create_from_image(img)
+		image_sprite.texture = image_original_tex
+		image_sprite.offset = image_original_tex.get_size() / 2
+		size = image_original_tex.get_size()
+	else:
+		print("An error occured!")
+
+func get_absolute_path(p: String) -> String:
+	if !p.begins_with("/"):
+		return Globals.cwd + "/" + p.lstrip("./")
+	return p
 
 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):
-			# this only works for Linux!
-			var img_path = m.strings[2]
-			if !img_path.begins_with("/"):
-				img_path = Globals.cwd + "/" + img_path.lstrip("./")
-			#
-			print("Load ", img_path)
-			var u_image = Image.load_from_file(img_path)
-			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)
+	# load images from //!load directive -> TEXTURE
+	var regex_match = load_regex.search(Globals.shader.code)
+	if regex_match == null: # Error!
+		print("Didn't find any load directives!")
+		return
+	var tex_path = get_absolute_path(regex_match.strings[1])
+	load_texture(tex_path) # load every time
+	if tex_path != last_tex_path:
+		camera.fit_image()
+		last_tex_path = tex_path
+	if Globals.last_image_savepath == "":
+		Globals.last_image_savepath = tex_path
+	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_additional_regex.search_all(Globals.shader.code):
+		# this only works for Linux!
+		var img_path = get_absolute_path(m.strings[2])
+		#
+		print("Load ", img_path)
+		var u_image = Image.load_from_file(img_path)
+		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 +1,7 @@
 extends Sprite2D
 
-@onready var camera = get_parent().get_node("Camera")
-
-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/Main.gd

@@ -1,33 +1,15 @@
 extends Node2D
 
-@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 = ""
+@onready var image_viewport = %ImageViewport
+@onready var ui_control_filesave = %SaveImageDialog
+
 
 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):
-	print("Load ", 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
-	else:
-		print("An error occured!")
-
 func _on_save_image_button_pressed():
 	if image_viewport.get_result() != null:
-		ui_control_filesave.current_path = last_save_filepath
+		ui_control_filesave.current_path = Globals.last_image_savepath
 		ui_control_filesave.show()
 
 func _on_save_image_dialog_file_selected(path):
@@ -36,4 +18,4 @@ func _on_save_image_dialog_file_selected(path):
 	if err != OK:
 		print("An error occured!")
 	else:
-		last_save_filepath = path
+		Globals.last_image_savepath = path

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/shaders/empty.gdshader

@@ -1,5 +1,7 @@
 shader_type canvas_item;
 
+//!load /path/to/your/image
+
 void fragment() {
 	// Called for every pixel the material is visible on.
 }