SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/transparent.frag

@@ -0,0 +1,13 @@
+uniform sampler2D tex;
+
+in vec2 uv;
+in vec4 color;
+out vec4 FragColor;
+
+void main()
+{
+    vec4 Color = texture(tex, uv);
+    Color *= color;
+    // Premultiply alpha
+    FragColor = vec4(Color.rgb * Color.a, Color.a);
+}