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materialsystem/stdshaders/depthwrite_ps2x.fxc

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+//  STATIC: "COLOR_DEPTH"					"0..1"
+
+//	DYNAMIC: "ALPHACLIP"					"0..1"
+
+const float g_AlphaThreshold : register( c0 );
+
+const float2 g_vNearFarPlanes	: register( c1 );
+	#define g_flNearPlane			g_vNearFarPlanes.x
+	#define g_flFarPlane			g_vNearFarPlanes.y
+
+struct PS_INPUT
+{
+#if ALPHACLIP
+	float2 texCoord0	:	TEXCOORD0;
+#endif
+
+#if COLOR_DEPTH
+	float4 vWorldPos_projPosZ	: TEXCOORD1;
+#endif
+};
+
+sampler BaseTextureSampler	: register( s0 );
+
+float4 main( PS_INPUT i ) : COLOR
+{
+	float4 color = float4( 1, 0, 0, 1 );	// opaque alpha....the color doesn't matter for this shader
+
+#if ALPHACLIP
+	color = tex2D( BaseTextureSampler, i.texCoord0 );
+
+	clip( color.a - g_AlphaThreshold );
+
+#endif
+
+#if ( COLOR_DEPTH == 1 )
+
+	return float4( i.vWorldPos_projPosZ.w / g_flFarPlane, 0.0, 0.0, 1.0 );
+
+#else
+
+	return color;
+
+#endif
+}