SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/degraded_ibl.frag

@@ -0,0 +1,26 @@
+uniform sampler2D ntex;
+uniform sampler2D ssao;
+
+#ifdef GL_ES
+layout (location = 0) out vec4 Diff;
+layout (location = 1) out vec4 Spec;
+#else
+out vec4 Diff;
+out vec4 Spec;
+#endif
+
+#stk_include "utils/decodeNormal.frag"
+#stk_include "utils/getPosFromUVDepth.frag"
+#stk_include "utils/DiffuseIBL.frag"
+#stk_include "utils/SpecularIBL.frag"
+
+void main(void)
+{
+    vec2 uv = gl_FragCoord.xy / u_screen;
+    vec3 normal = DecodeNormal(texture(ntex, uv).xy);
+    vec3 spec_color = vec3(0.031, 0.106, 0.173);
+    float ao = texture(ssao, uv).x;
+
+    Diff = vec4(0.25 * DiffuseIBL(normal) * ao, 1.);
+    Spec = vec4(spec_color * ao, 1.);
+}