SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/blurshadowH.comp

@@ -0,0 +1,33 @@
+uniform sampler2D source;
+layout(r32f) restrict writeonly uniform image2D dest;
+uniform vec2 pixel;
+uniform float weights[7];
+
+// Gaussian separated blur with radius 6.
+
+layout (local_size_x = 8, local_size_y = 8) in;
+
+shared float local_src[8 + 2 * 6][8];
+
+void main()
+{
+    int x = int(gl_LocalInvocationID.x), y = int(gl_LocalInvocationID.y);
+    ivec2 iuv = ivec2(gl_GlobalInvocationID.x, gl_GlobalInvocationID.y);
+    vec2 uv_m = (iuv - ivec2(6, 0)) * pixel;
+    vec2 uv = iuv * pixel;
+    vec2 uv_p = (iuv + ivec2(6, 0)) * pixel;
+
+    local_src[x][y] = texture(source, uv_m).x;
+    local_src[x + 6][y] = texture(source, uv).x;
+    local_src[x + 12][y] = texture(source, uv_p).x;
+
+    barrier();
+
+    float sum = local_src[x + 6][y] * weights[0];
+    for (int i = 1; i < 6; i++) {
+        sum += local_src[6 + x - i][y] * weights[i];
+        sum += local_src[6 + x + i][y] * weights[i];
+    }
+
+    imageStore(dest, iuv, vec4(sum));
+}