NORSPEC-287 Make alpha sRGB correction curves match OpenGL spec.

1 files changed, 12 insertions, 1 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
index 6f2cfae6d2..a3610bfffa 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/postDeferredGammaCorrect.glsl
@@ -38,9 +38,20 @@ VARYING vec2 vary_fragcoord;
 
 uniform float texture_gamma;
 
+vec3 linear_to_srgb(vec3 cl)
+{
+	    /*{  0.0,                          0         <= cl
+            {  12.92 * c,                    0         <  cl < 0.0031308
+    cs = {  1.055 * cl^0.41666 - 0.055,   0.0031308 <= cl < 1
+            {  1.0,                                       cl >= 1*/
+
+	return 1.055 * pow(cl, vec3(0.41666)) - 0.055;
+}
+
 void main() 
 {
 	vec4 diff = texture2DRect(diffuseRect, vary_fragcoord);
-	frag_color = pow(diff, vec4(texture_gamma, texture_gamma, texture_gamma, 1.0f));
+	diff.rgb = linear_to_srgb(diff.rgb);
+	frag_color = diff;
 }