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-rw-r--r--indra/newview/app_settings/shaders/class1/deferred/materialF.glsl13
1 files changed, 6 insertions, 7 deletions
diff --git a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
index b26194f278..b30d7655db 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/materialF.glsl
@@ -202,7 +202,7 @@ VARYING vec2 vary_texcoord2;
uniform float env_intensity;
uniform vec4 specular_color; // specular color RGB and specular exponent (glossiness) in alpha
-#ifdef HAS_ALPHA_MASK
+#if (DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_MASK)
uniform float minimum_alpha;
#endif
@@ -227,12 +227,11 @@ void main()
vec4 diffcol = texture2D(diffuseMap, vary_texcoord0.xy);
diffcol.rgb *= vertex_color.rgb;
-#ifdef HAS_ALPHA_MASK
-#if DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_BLEND
- if (diffcol.a*vertex_color.a < minimum_alpha)
-#else
- if (diffcol.a < minimum_alpha)
-#endif
+#if (DIFFUSE_ALPHA_MODE == DIFFUSE_ALPHA_MODE_MASK)
+
+ // Comparing floats cast from 8-bit values, produces acne right at the 8-bit transition points
+ float bias = 0.001953125; // 1/512, or half an 8-bit quantization (SL-18637)
+ if (diffcol.a < minimum_alpha-bias)
{
discard;
}