X-Git-Url: https://gitweb.ps.run/subsurface_scattering/blobdiff_plain/9d10826ccb5d1f8a3821d4d2f4242c401146d12d..refs/heads/main:/shaders/fbo_frag.glsl

diff --git a/shaders/fbo_frag.glsl b/shaders/fbo_frag.glsl
index cf1fafa..8ffc0ce 100644
--- a/shaders/fbo_frag.glsl
+++ b/shaders/fbo_frag.glsl
@@ -3,11 +3,26 @@ out vec4 FragColor;
   
 in vec2 TexCoords;
 
-uniform sampler2D screenTexture;
+uniform sampler2D shadowmapTexture;
+uniform sampler2D irradianceTexture;
+uniform int screenWidth;
+uniform int screenHeight;
+uniform int renderState;
+uniform vec2 samplePositions[13];
+uniform vec3 sampleWeights[13];
 
 void main()
-{ 
-    FragColor = vec4(
-        texture(screenTexture, TexCoords).rgb,
-        1.0);
+{
+    // sample calculated irradiance
+    // using Gaussian kernel to approximate light spread
+    vec4 result = vec4(0, 0, 0, 1);
+    for (int i = 0; i < 13; i++) {
+        vec2 sampleCoords = TexCoords + samplePositions[i] * vec2(1.0/screenWidth, 1.0/screenHeight);
+        //vec4 sample = texture(irradianceTexture, sampleCoords)
+        //            * texture(shadowmapTexture, sampleCoords);
+        vec4 sample = texture(irradianceTexture, sampleCoords);
+        vec4 weight = vec4(sampleWeights[i], 1);
+        result += sample * weight;
+    }
+    FragColor = result;
 }