NORSPEC-327 modify 'select' ops in srgb shader code to mollify the doddering mac GLSL compiler

1 files changed, 24 insertions, 0 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/srgb.glsl b/indra/newview/app_settings/shaders/class1/deferred/srgb.glsl
index 177f6c25f8..d532835bf1 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/srgb.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/srgb.glsl
@@ -23,6 +23,8 @@
  * $/LicenseInfo$
  */
 
+// OLD_SELECT work-around missing mix(vec3,vec,bvec3) in older GLSL versions (*cough* MAC *cough*)
+
 vec3 srgb_to_linear(vec3 cs)
 {
 	
@@ -32,7 +34,17 @@ vec3 srgb_to_linear(vec3 cs)
 
 	vec3 low_range = cs / vec3(12.92);
 	vec3 high_range = pow((cs+vec3(0.055))/vec3(1.055), vec3(2.4));
+
+	bvec3 lte = lessThanEqual(cs,vec3(0.04045));
+#ifdef OLD_SELECT
+	vec3 result;
+	result.r = lte.r ? low_range.r : high_range.r;
+	result.g = lte.g ? low_range.g : high_range.g;
+	result.b = lte.b ? low_range.b : high_range.b;
+    return result;
+#else
 	return mix(high_range, low_range, lessThanEqual(cs,vec3(0.04045)));
+#endif
 }
 
 vec3 linear_to_srgb(vec3 cl)
@@ -45,5 +57,17 @@ vec3 linear_to_srgb(vec3 cl)
 	cl = clamp(cl, vec3(0), vec3(1));
 	vec3 low_range  = cl * 12.92;
 	vec3 high_range = 1.055 * pow(cl, vec3(0.41666)) - 0.055;
+
+	bvec3 lt = lessThan(cl,vec3(0.0031308));
+
+#ifdef OLD_SELECT
+	vec3 result;
+	result.r = lt.r ? low_range.r : high_range.r;
+	result.g = lt.g ? low_range.g : high_range.g;
+	result.b = lt.b ? low_range.b : high_range.b;
+    return result;
+#else
 	return mix(high_range, low_range, lessThan(cl,vec3(0.0031308)));
+#endif
 }
+