SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/lensblend.frag

@@ -0,0 +1,26 @@
+/*
+Lens flare blend
+based on bloomblend.frag
+author: samuncle
+*/
+uniform sampler2D tex_128;
+uniform sampler2D tex_256;
+uniform sampler2D tex_512;
+
+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);
+    
+    // Blue color for lens flare
+    /*col *= 0.5;
+    float final = max(col.r,max(col.g,col.b));
+    final = final * 2;
+    vec3 blue = vec3(final * 0.1, final * 0.2, final);*/
+    
+    FragColor = vec4(col.rgb, 1.);
+}