From d6ee569963d3e1ab005e6852f44e4175fd518b8e Mon Sep 17 00:00:00 2001
From: Geenz <geenz@geenzo.com>
Date: Mon, 25 Apr 2016 23:52:33 -0400
Subject: [PATCH] Add sRGB conversions to shaders.

---
 libraries/gpu/src/gpu/Color.slh | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libraries/gpu/src/gpu/Color.slh b/libraries/gpu/src/gpu/Color.slh
index d4d9ba7b81..4330b34b90 100644
--- a/libraries/gpu/src/gpu/Color.slh
+++ b/libraries/gpu/src/gpu/Color.slh
@@ -11,9 +11,14 @@
 <@if not GPU_COLOR_SLH@>
 <@def GPU_COLOR_SLH@>
 
+float sRGBFloatToLinear(float value) {
+    const float SRGB_ELBOW = 0.04045;
+    
+    return (value <= SRGB_ELBOW) ? value / 12.92 : pow((value + 0.055) / 1.055, 2.4);
+}
+
 vec3 colorToLinearRGB(vec3 srgb) {
-    const float GAMMA_22 = 2.2;
-    return pow(srgb, vec3(GAMMA_22));
+    return vec3(sRGBFloatToLinear(srgb.r), sRGBFloatToLinear(srgb.g), sRGBFloatToLinear(srgb.b));
 }
 
 vec4 colorToLinearRGBA(vec4 srgba) {