SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/godfade.frag

@@ -0,0 +1,20 @@
+uniform sampler2D tex;
+uniform vec3 col;
+
+out vec4 FragColor;
+
+void main()
+{
+	// Use quarter resolution
+	vec2 uv = 4. * gl_FragCoord.xy / u_screen;
+	vec4 res = texture(tex, uv);
+
+	// Keep the sun fully bright, but fade the sky
+	float mul = distance(res.xyz, col);
+	mul = step(mul, 0.02);
+	mul *= 0.97;
+
+	res = res * vec4(mul);
+
+	FragColor = res;
+}