SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/bilateralV.frag

@@ -0,0 +1,39 @@
+// From http://http.developer.nvidia.com/GPUGems3/gpugems3_ch40.html
+
+uniform sampler2D tex;
+uniform sampler2D depth;
+uniform vec2 pixel;
+
+out vec4 FragColor;
+
+void main()
+{
+    float sigma = 2.;
+
+    vec2 uv = gl_FragCoord.xy * pixel;
+    float X = uv.x;
+    float Y = uv.y;
+
+    float g0, g1, g2;
+    g0 = 1.0 / (sqrt(2.0 * 3.14) * sigma);
+    g1 = exp(-0.5 / (sigma * sigma));
+    g2 = g1 * g1;
+    vec4 sum = texture(tex, vec2(X, Y)) * g0;
+    float pixel_depth = texture(depth, vec2(X, Y)).x;
+    g0 *= g1;
+    g1 *= g2;
+    float tmp_weight, total_weight = g0;
+    for (int i = 1; i < 5; i++) {
+        tmp_weight = max(0.0, 1.0 - .001 * abs(texture(depth, vec2(X, Y - float(i) * pixel.y)).x - pixel_depth));
+        sum += texture(tex, vec2(X, Y - float(i) * pixel.y)) * g0 * tmp_weight;
+        total_weight += g0 * tmp_weight;
+        tmp_weight = max(0.0, 1.0 - .001 * abs(texture(depth, vec2(X, Y + float(i) * pixel.y)).x - pixel_depth));
+        sum += texture(tex, vec2(X, Y + float(i) * pixel.y)) * g0 * tmp_weight;
+        total_weight += g0 * tmp_weight;
+        g0 *= g1;
+        g1 *= g2;
+    }
+
+    FragColor = sum / total_weight;
+}
+