SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/linearizedepth.frag

@@ -0,0 +1,13 @@
+uniform sampler2D tex;
+uniform float zn;
+uniform float zf;
+
+out float Depth;
+
+void main()
+{
+    vec2 uv = gl_FragCoord.xy / u_screen;
+    float d = texture(tex, uv).x;
+    float c0 = zn * zf, c1 = zn - zf, c2 = zf;
+    Depth = c0 / (d * c1 + c2);
+}