1 files changed, 58 insertions, 0 deletions
diff --git a/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl b/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl
index 35e22ef3a2..35ccc65a8e 100644
--- a/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl
+++ b/indra/newview/app_settings/shaders/class2/deferred/pbralphaF.glsl
@@ -25,6 +25,8 @@
 
 /*[EXTRA_CODE_HERE]*/
 
+#ifndef IS_HUD
+
 uniform sampler2D diffuseMap;  //always in sRGB space
 uniform sampler2D bumpMap;
 uniform sampler2D emissiveMap;
@@ -249,3 +251,59 @@ void main()
     a += f;
     frag_color = vec4(color.rgb,a);
 }
+
+#else
+
+uniform sampler2D diffuseMap;  //always in sRGB space
+uniform sampler2D emissiveMap;
+
+uniform vec3 emissiveColor;
+
+out vec4 frag_color;
+
+in vec3 vary_position;
+
+in vec2 basecolor_texcoord;
+in vec2 emissive_texcoord;
+
+in vec4 vertex_color;
+
+#ifdef HAS_ALPHA_MASK
+uniform float minimum_alpha; // PBR alphaMode: MASK, See: mAlphaCutoff, setAlphaCutoff()
+#endif
+
+vec3 srgb_to_linear(vec3 c);
+vec3 linear_to_srgb(vec3 c);
+
+
+void main()
+{
+    vec3 color = vec3(0,0,0);
+
+    vec3  pos         = vary_position;
+
+    vec4 basecolor = texture(diffuseMap, basecolor_texcoord.xy).rgba;
+    basecolor.rgb = srgb_to_linear(basecolor.rgb);
+#ifdef HAS_ALPHA_MASK
+    if (basecolor.a < minimum_alpha)
+    {
+        discard;
+    }
+#endif
+
+    color = vertex_color.rgb * basecolor.rgb;
+
+    // emissiveColor is the emissive color factor from GLTF and is already in linear space
+    vec3 colorEmissive = emissiveColor;
+    // emissiveMap here is a vanilla RGB texture encoded as sRGB, manually convert to linear
+    colorEmissive *= srgb_to_linear(texture2D(emissiveMap, emissive_texcoord.xy).rgb);
+
+    
+    float a = basecolor.a*vertex_color.a;
+    a = 1.0;
+    color += colorEmissive;
+    color = linear_to_srgb(color);
+    frag_color = vec4(color.rgb,a);
+}
+
+#endif