SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/bloom.frag

@@ -0,0 +1,19 @@
+uniform sampler2D tex;
+uniform float scale;
+
+out vec4 FragColor;
+
+#stk_include "utils/getCIEXYZ.frag"
+#stk_include "utils/getRGBfromCIEXxy.frag"
+
+void main()
+{
+    vec2 uv = gl_FragCoord.xy / (512. * scale);
+    vec3 col = texture(tex, uv).xyz;
+    vec3 Yxy = getCIEYxy(col);
+    vec3 WhiteYxy = getCIEYxy(vec3(1.));
+
+    Yxy.x = smoothstep(WhiteYxy.x, WhiteYxy.x * 4., Yxy.x);
+
+    FragColor = vec4(max(vec3(0.), getRGBFromCIEXxy(Yxy)), 1.0);
+}