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shaderlib: Remove hsv_multiply and hsv_offset, rename hsv.gdshaderinc to colorspaces.gdshaderinc, update autocomplete and example accordingly; implements #36

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ChaoticByte 2025-01-10 21:58:23 +01:00
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shaderlib/hsv.gdshaderinc
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@ -1,50 +0,0 @@
// 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);
}
// Offset the hue, saturation and brightness of a RGB color
vec4 hsv_offset(
vec4 rgba,
float offset_hue,
float offset_saturation,
float offset_brightness
) {
vec4 c = rgb2hsv(rgba);
c.x += offset_hue;
c.y += offset_saturation;
c.z += offset_brightness;
return hsv2rgb(c);
}
// Multiply the hue, saturation and brightness of a RGB color
vec4 hsv_multiply(
vec4 rgba,
float mult_hue,
float mult_saturation,
float mult_brightness
) {
vec4 c = rgb2hsv(rgba);
c.x *= mult_hue;
c.y *= mult_saturation;
c.z *= mult_brightness;
return hsv2rgb(c);
}