1 files changed, 15 insertions, 15 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl b/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
index a4637b9df91..d1cb25af82f 100644
--- a/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
@@ -1,5 +1,9 @@
+
+#pragma BLENDER_REQUIRE(common_math_lib.glsl)
+
 /**
- * Simple down-sample shader. Takes the average of the 4 texels of lower mip.
+ * Simple down-sample shader.
+ * Do a gaussian filter using 4 bilinear texture samples.
  */
 
 uniform sampler2D source;
@@ -7,31 +11,27 @@ uniform float fireflyFactor;
 
 out vec4 FragColor;
 
-float brightness(vec3 c)
-{
-  return max(max(c.r, c.g), c.b);
-}
-
 void main()
 {
-#if 0
-  /* Reconstructing Target uvs like this avoid missing pixels if NPO2 */
-  vec2 uvs = gl_FragCoord.xy * 2.0 / vec2(textureSize(source, 0));
+  vec2 texel_size = 1.0 / vec2(textureSize(source, 0));
+  vec2 uvs = gl_FragCoord.xy * texel_size;
 
+#ifdef COPY_SRC
   FragColor = textureLod(source, uvs, 0.0);
+  FragColor = safe_color(FragColor);
+
+  /* Clamped brightness. */
+  float luma = max(1e-8, max_v3(FragColor.rgb));
+  FragColor *= 1.0 - max(0.0, luma - fireflyFactor) / luma;
+
 #else
-  vec2 texel_size = 1.0 / vec2(textureSize(source, 0));
-  vec2 uvs = gl_FragCoord.xy * 2.0 * texel_size;
   vec4 ofs = texel_size.xyxy * vec4(0.75, 0.75, -0.75, -0.75);
+  uvs *= 2.0;
 
   FragColor = textureLod(source, uvs + ofs.xy, 0.0);
   FragColor += textureLod(source, uvs + ofs.xw, 0.0);
   FragColor += textureLod(source, uvs + ofs.zy, 0.0);
   FragColor += textureLod(source, uvs + ofs.zw, 0.0);
   FragColor *= 0.25;
-
-  /* Clamped brightness. */
-  float luma = max(1e-8, brightness(FragColor.rgb));
-  FragColor *= 1.0 - max(0.0, luma - fireflyFactor) / luma;
 #endif
 }