Eevee: SSR Clamp color when blurring buffers.

This effectivly reduce firefly bleeding all over the place.
We still need the clamp in the resolve pass because the level 0 has not been clamped.
NOTE: I did not clamped each sample individually for performance BUT I did not profile it to know how much it cost.

1 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/lightprobe_planar_downsample_frag.glsl b/source/blender/draw/engines/eevee/shaders/lightprobe_planar_downsample_frag.glsl
index 44e0c176010..3b3abdef00c 100644
--- a/source/blender/draw/engines/eevee/shaders/lightprobe_planar_downsample_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/lightprobe_planar_downsample_frag.glsl
@@ -3,13 +3,18 @@
  **/
 
 uniform sampler2DArray source;
-uniform vec2 texelSize;
+uniform float fireflyFactor;
 
 in vec2 uvs;
 flat in float layer;
 
 out vec4 FragColor;
 
+float brightness(vec3 c)
+{
+	return max(max(c.r, c.g), c.b);
+}
+
 void main()
 {
 #if 0
@@ -27,5 +32,9 @@ void main()
 	FragColor += textureLod(source, vec3(uvs + ofs.zy, layer), 0.0);
 	FragColor += textureLod(source, vec3(uvs + ofs.zw, layer), 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
 }
\ No newline at end of file