X-Git-Url: https://gitweb.ps.run/subsurface_scattering/blobdiff_plain/451e872ddbe6db8bd8d6aa54ca0bf744dc5405e5..refs/heads/main:/shaders/fbo_frag.glsl

diff --git a/shaders/fbo_frag.glsl b/shaders/fbo_frag.glsl
index f6f12cd..8ffc0ce 100644
--- a/shaders/fbo_frag.glsl
+++ b/shaders/fbo_frag.glsl
@@ -3,31 +3,26 @@ out vec4 FragColor;
   
 in vec2 TexCoords;
 
-uniform sampler2D screenTexture;
-uniform int applySSSSS;
-uniform int N;
+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()
 {
-    if (applySSSSS == 1) {
-        float x = 1.0/1600.0;
-        float y = 1.0/900.0;
-
-        float maxDist = N*N + N*N;
-
-        vec4 color = vec4(0, 0, 0, 1);
-        for (int i = -N; i <= N; i++) {
-            for (int j = -N; j <= N; j++) {
-                float dist = i*i + j*j;
-                vec4 newC = texture(screenTexture, TexCoords + vec2(i*x, j*y)) / (2*N*N);
-                float factor = 1 - (dist / maxDist);
-                factor = pow(factor, 2);
-                color += newC * factor;
-            }
-        }
-        FragColor = color;
-    }
-    else {
-        FragColor = texture(screenTexture, TexCoords);
+    // 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;
 }