SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/tonemap.frag

@@ -0,0 +1,21 @@
+uniform sampler2D tex;
+uniform float vignette_weight;
+
+out vec4 FragColor;
+
+#stk_include "utils/getCIEXYZ.frag"
+#stk_include "utils/getRGBfromCIEXxy.frag"
+
+void main()
+{
+    vec2 uv = gl_FragCoord.xy / u_screen;
+    vec4 col = texture(tex, uv);
+
+    // Uncharted2 tonemap with Auria's custom coefficients
+    vec4 perChannel = (col * (6.9 * col + .5)) / (col * (5.2 * col + 1.7) + 0.06);
+    vec2 inside = uv - 0.5;
+    float vignette = 1. - dot(inside, inside) * vignette_weight;
+    vignette = clamp(pow(vignette, 0.8), 0., 1.);
+
+    FragColor = vec4(perChannel.xyz * vignette, col.a);
+}