From 8c1518f25902a8874efc62afdede194358051a02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Tue, 17 Feb 2015 16:26:10 -0800
Subject: [PATCH] Added toLinear/GammaAccurate shader functions.

---
 examples/common/shaderlib.sh | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/examples/common/shaderlib.sh b/examples/common/shaderlib.sh
index 8f1d30eb..b8915d16 100644
--- a/examples/common/shaderlib.sh
+++ b/examples/common/shaderlib.sh
@@ -183,6 +183,19 @@ vec4 toLinear(vec4 _rgba)
 	return vec4(toLinear(_rgba.xyz), _rgba.w);
 }
 
+vec3 toLinearAccurate(vec3 _rgb)
+{
+	vec3 lo = _rgb / 12.92;
+	vec3 hi = pow( (_rgb + 0.055) / 1.055, vec3_splat(2.4) );
+	vec3 rgb = mix(hi, lo, vec3(lessThanEqual(_rgb, vec3_splat(0.04045) ) ) );
+	return rgb;
+}
+
+vec4 toLinearAccurate(vec4 _rgba)
+{
+	return vec4(toLinearAccurate(_rgba.xyz), _rgba.w);
+}
+
 float toGamma(float _r)
 {
 	return pow(abs(_r), 1.0/2.2);
@@ -198,6 +211,19 @@ vec4 toGamma(vec4 _rgba)
 	return vec4(toGamma(_rgba.xyz), _rgba.w);
 }
 
+vec3 toGammaAccurate(vec3 _rgb)
+{
+	vec3 lo  = _rgb * 12.92;
+	vec3 hi  = pow(abs(_rgb), vec3_splat(1.0/2.4) ) * 1.055 - 0.055;
+	vec3 rgb = mix(hi, lo, vec3(lessThanEqual(_rgb, vec3_splat(0.0031308) ) ) );
+	return rgb;
+}
+
+vec4 toGammaAccurate(vec4 _rgba)
+{
+	return vec4(toGammaAccurate(_rgba.xyz), _rgba.w);
+}
+
 vec3 toReinhard(vec3 _rgb)
 {
 	return toGamma(_rgb/(_rgb+vec3_splat(1.0) ) );