SDK sync.

materialsystem/stdshaders/shadowmodel_ps20.fxc

@@ -0,0 +1,20 @@
+
+struct PS_INPUT
+{
+	float4 T0				: TEXCOORD0;
+	float3 T1				: TEXCOORD1;
+	float3 T2				: TEXCOORD2;
+	float  T3				: TEXCOORD3;
+	float3 vColor			: COLOR0;
+};
+
+float4 main( PS_INPUT i ) : COLOR
+{
+	// Kill pixel against various fields computed in vertex shader
+	clip ( i.T1 );
+	clip ( i.T2 );
+	clip ( i.T3 ); // Backface cull
+
+	// i.T0.a is uninitialized by the vs, but this is how the original asm shader was written????
+	return float4( lerp( float3(1,1,1), i.vColor.xyz, i.T0.a ), 1 );
+}