SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/alphatest_particle.frag

@@ -0,0 +1,15 @@
+uniform sampler2D tex;
+
+in vec2 tc;
+in vec4 pc;
+out vec4 FragColor;
+
+void main(void)
+{
+    vec4 color = texture(tex, tc) * pc;
+    if (color.a < 0.5)
+    {
+        discard;
+    }
+    FragColor = color;
+}