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shaderlib: Fixed pack/unpack float to rgba.

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This commit is contained in:
Daniele Bartolini
2025-12-23 01:25:45 +01:00
committed by Branimir Karadžić
parent 56eb016280
commit 3d08ee19fc
1 changed files with 9 additions and 6 deletions
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15
examples/common/shaderlib.sh
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@@ -336,8 +336,11 @@ vec3 adjustHue(vec3 _rgb, float _hue)
vec4 packFloatToRgba(float _value) vec4 packFloatToRgba(float _value)
{ {
const vec4 shift = vec4(256 * 256 * 256, 256 * 256, 256, 1.0); // Reference(s):
const vec4 mask = vec4(0, 1.0 / 256.0, 1.0 / 256.0, 1.0 / 256.0); // - Encoding floats to RGBA - the final?
// https://web.archive.org/web/20250914131649/https://aras-p.info/blog/2009/07/30/encoding-floats-to-rgba-the-final/
const vec4 shift = vec4(255 * 255 * 255, 255 * 255, 255, 1.0);
const vec4 mask = vec4(0, 1.0 / 255.0, 1.0 / 255.0, 1.0 / 255.0);
vec4 comp = fract(_value * shift); vec4 comp = fract(_value * shift);
comp -= comp.xxyz * mask; comp -= comp.xxyz * mask;
return comp; return comp;
@@ -345,14 +348,14 @@ vec4 packFloatToRgba(float _value)
float unpackRgbaToFloat(vec4 _rgba) float unpackRgbaToFloat(vec4 _rgba)
{ {
const vec4 shift = vec4(1.0 / (256.0 * 256.0 * 256.0), 1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0); const vec4 shift = vec4(1.0 / (255.0 * 255.0 * 255.0), 1.0 / (255.0 * 255.0), 1.0 / 255.0, 1.0);
return dot(_rgba, shift); return dot(_rgba, shift);
} }
vec2 packHalfFloat(float _value) vec2 packHalfFloat(float _value)
{ {
const vec2 shift = vec2(256, 1.0); const vec2 shift = vec2(255, 1.0);
const vec2 mask = vec2(0, 1.0 / 256.0); const vec2 mask = vec2(0, 1.0 / 255.0);
vec2 comp = fract(_value * shift); vec2 comp = fract(_value * shift);
comp -= comp.xx * mask; comp -= comp.xx * mask;
return comp; return comp;
@@ -360,7 +363,7 @@ vec2 packHalfFloat(float _value)
float unpackHalfFloat(vec2 _rg) float unpackHalfFloat(vec2 _rg)
{ {
const vec2 shift = vec2(1.0 / 256.0, 1.0); const vec2 shift = vec2(1.0 / 255.0, 1.0);
return dot(_rg, shift); return dot(_rg, shift);
} }