SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/bloomblend.frag

@@ -0,0 +1,24 @@
+uniform sampler2D tex_128;
+uniform sampler2D tex_256;
+uniform sampler2D tex_512;
+
+uniform sampler2D tex_dust;
+
+out vec4 FragColor;
+
+void main()
+{
+    vec2 uv = gl_FragCoord.xy / u_screen;
+    vec4 col = .125 * texture(tex_128, uv);
+    col += .25 * texture(tex_256, uv);
+    col += .5 * texture(tex_512, uv);
+
+    /* Lens dust effect ---- */
+    vec4 col2 = texture(tex_128, uv);
+    col2 += col2;
+    col2 += col2;
+    //float dustMask = max(col2.r,max(col2.g,col2.b));
+    col += texture(tex_dust, uv) * col2;
+
+    FragColor = vec4(col.xyz, 1.);
+}