Restructured shaderlib by moving functions and renaming files

README.md

@@ -80,12 +80,15 @@ Here is an example:
 ```glsl
 shader_type canvas_item;
 
-#include "res://shaderlib/hsv.gdshaderinc"
+#include "res://shaderlib/oklab.gdshaderinc"
 
-//!load ./examples/images/swamp.jpg
+//!load ./images/swamp.jpg
 
 void fragment() {
-	COLOR = hsv_offset(COLOR, 0.32, 0.2, 0.0);
+	vec4 oklab = rgb2oklab(COLOR);
+	vec4 oklch = oklab2oklch(oklab);
+	oklch.z -= 2.0;
+	COLOR = oklab2rgb(oklch2oklab(oklch));
 }
 ```
 

examples/color_and_pixelate.gdshader

@@ -1,7 +1,7 @@
 shader_type canvas_item;
 
-#include "res://shaderlib/colorspaces.gdshaderinc"
-#include "res://shaderlib/effects.gdshaderinc"
+#include "res://shaderlib/hsv.gdshaderinc"
+#include "res://shaderlib/pixelate.gdshaderinc"
 
 //!load ./images/swamp.jpg
 

examples/oklab.gdshader

@@ -1,6 +1,6 @@
 shader_type canvas_item;
 
-#include "res://shaderlib/colorspaces.gdshaderinc"
+#include "res://shaderlib/oklab.gdshaderinc"
 
 //!load ./images/swamp.jpg
 

examples/place_texture.gdshader

@@ -1,7 +1,7 @@
 shader_type canvas_item;
 
-#include "res://shaderlib/transform.gdshaderinc"
-#include "res://shaderlib/transparency.gdshaderinc"
+#include "res://shaderlib/place_texture.gdshaderinc"
+#include "res://shaderlib/common.gdshaderinc"
 
 //!load ./images/swamp.jpg
 //!load+ img2 ./images/grass.png

shaderlib/common.gdshaderinc

@@ -3,3 +3,13 @@
 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);
+}

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/oklab.gdshaderinc

@@ -1,42 +1,16 @@
 
-/*
-	Color space conversion functions always work with vec4.
-	The fourth value is always alpha.
-*/
-
-#include "res://shaderlib/common.gdshaderinc"
-
-/*
-	rgb2hsv and hsv2rgb functions adapted
-	from https://godotshaders.com/shader/hsv-adjustment/
-	original code by https://godotshaders.com/author/al1-ce/
-*/
-
-// 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);
-}
-
 /*
 	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 "res://shaderlib/common.gdshaderinc"
+
 vec4 rgb2oklab(vec4 c) {
 	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;

shaderlib/transparency.gdshaderinc

@@ -1,10 +0,0 @@
-
-/*
-	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);
-}