Latest compatible version of Classicube from the original GitHub repository (https://github.com/ClassiCube/ClassiCube) that can be compiled on Classicube for PowerMac PPC running Mac OS X 10.4.

misc/vita/textured_alpha_f.cg

@@ -0,0 +1,12 @@
+float4 main
+(
+	uniform sampler2D tex,
+	float4 out_color    : COLOR,
+	float2 out_texcoord : TEXCOORD0
+) : COLOR
+{
+	float4 color = tex2D(tex, out_texcoord) * out_color;
+	
+	if (color.a < 0.5) discard;
+	return color;
+}