SuperTuxKart 1.5 upstream source (from official release tarball)

data/shaders/sp_shadow_alpha_test.frag

@@ -0,0 +1,14 @@
+#stk_include "utils/sp_texture_sampling.frag"
+
+in vec2 uv;
+out vec4 o_frag_color;
+
+void main(void)
+{
+    vec4 col = sampleTextureLayer0(uv);
+    if (col.a < 0.5)
+    {
+        discard;
+    }
+    o_frag_color = vec4(1.0);
+}