Fix large performance drop when enabling AA on macOS/lower end GPU hardware

1 files changed, 14 insertions, 2 deletions

diff --git a/indra/newview/app_settings/shaders/class1/deferred/SMAA.glsl b/indra/newview/app_settings/shaders/class1/deferred/SMAA.glsl
index fdb77cce6e..5837308965 100644
--- a/indra/newview/app_settings/shaders/class1/deferred/SMAA.glsl
+++ b/indra/newview/app_settings/shaders/class1/deferred/SMAA.glsl
@@ -1351,6 +1351,10 @@ float4 SMAABlendingWeightCalculationPS(float2 texcoord,
 //-----------------------------------------------------------------------------
 // Neighborhood Blending Pixel Shader (Third Pass)
 
+vec3 srgb_to_linear(vec3 cs);
+vec4 srgb_to_linear4(vec4 cs);
+vec3 linear_to_srgb(vec3 cl);
+
 float4 SMAANeighborhoodBlendingPS(float2 texcoord,
                                   float4 offset,
                                   SMAATexture2D(colorTex),
@@ -1369,6 +1373,7 @@ float4 SMAANeighborhoodBlendingPS(float2 texcoord,
     SMAA_BRANCH
     if (dot(a, float4(1.0, 1.0, 1.0, 1.0)) < 1e-5) {
         float4 color = SMAASampleLevelZero(colorTex, texcoord);
+        color.rgb = srgb_to_linear(color.rgb);
 
         #if SMAA_REPROJECTION
         float2 velocity = SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, texcoord));
@@ -1377,6 +1382,7 @@ float4 SMAANeighborhoodBlendingPS(float2 texcoord,
         color.a = sqrt(5.0 * length(velocity));
         #endif
 
+        color.rgb = linear_to_srgb(color.rgb);
         return color;
     } else {
         bool h = max(a.x, a.z) > max(a.y, a.w); // max(horizontal) > max(vertical)
@@ -1393,8 +1399,13 @@ float4 SMAANeighborhoodBlendingPS(float2 texcoord,
 
         // We exploit bilinear filtering to mix current pixel with the chosen
         // neighbor:
-        float4 color = blendingWeight.x * SMAASampleLevelZero(colorTex, blendingCoord.xy);
-        color += blendingWeight.y * SMAASampleLevelZero(colorTex, blendingCoord.zw);
+        float4 color = SMAASampleLevelZero(colorTex, blendingCoord.xy);
+        color.rgb = srgb_to_linear(color.rgb);
+        color = blendingWeight.x * color;
+
+        float4 color2 = SMAASampleLevelZero(colorTex, blendingCoord.zw);
+        color2.rgb = srgb_to_linear(color2.rgb);
+        color += blendingWeight.y * color2;
 
         #if SMAA_REPROJECTION
         // Antialias velocity for proper reprojection in a later stage:
@@ -1405,6 +1416,7 @@ float4 SMAANeighborhoodBlendingPS(float2 texcoord,
         color.a = sqrt(5.0 * length(velocity));
         #endif
 
+        color.rgb = linear_to_srgb(color.rgb);
         return color;
     }
 }