Removed presets, load all images via load directives (implements #9), removed obsolete code, added some improvements

examples/CREDITS.md

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+
+# 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

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+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);
+
+void fragment() {
+	COLOR.r = texture(TEXTURE , UV + offset_r).r;
+	COLOR.g = texture(TEXTURE , UV + offset_g).g;
+	COLOR.b = texture(TEXTURE , UV + offset_b).b;
+	COLOR.a = COLOR.a;
+}

examples/greyscale.gdshader

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+shader_type canvas_item;
+
+//!load ./swamp.jpg
+
+void fragment() {
+	float b = (COLOR.r + COLOR.g + COLOR.b) / 3.0;
+	COLOR.r = b;
+	COLOR.g = b;
+	COLOR.b = b;
+}

examples/lowpass.gdshader

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+shader_type canvas_item;
+
+//!load ./swamp.jpg
+
+// 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;
+}

examples/mix.gdshader

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+shader_type canvas_item;
+
+//!load ./swamp.jpg
+
+//!load+ img2 ./overlay.jpg
+uniform sampler2D img2: repeat_enable, filter_nearest;
+
+void fragment() {
+	COLOR = mix(COLOR, texture(img2, UV), .2);
+}

examples/overlay.jpg.import

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+[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

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+shader_type canvas_item;
+
+//!load ./swamp.jpg
+
+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);
+}

examples/swamp.jpg.import

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+[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