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/xbox/ps_coloured.ps.cg

@@ -0,0 +1,10 @@
+struct vOut {
+	float4 color : COLOR;
+};
+
+float4 main(
+		vOut input
+	) : COLOR
+{
+	return input.color;
+}