Eevee: SSR: Add mipmap filtering and bias to reduce noise.

Also fix the roughness factors.

1 files changed, 15 insertions, 0 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
new file mode 100644
index 00000000000..4a79fa908b1
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/effect_downsample_frag.glsl
@@ -0,0 +1,15 @@
+/**
+ * Simple downsample shader. Takes the average of the 4 texels of lower mip.
+ **/
+
+uniform sampler2D source;
+
+out vec4 FragColor;
+
+void main()
+{
+	/* Reconstructing Target uvs like this avoid missing pixels if NPO2 */
+	vec2 uvs = gl_FragCoord.xy * 2.0 / vec2(textureSize(source, 0));
+
+	FragColor = texture(source, uvs);
+}
\ No newline at end of file