1 files changed, 51 insertions, 0 deletions
diff --git a/materialsystem/stdshaders/luminance_compare_ps2x.fxc b/materialsystem/stdshaders/luminance_compare_ps2x.fxc
new file mode 100644
index 0000000..20b3bc6
--- /dev/null
+++ b/materialsystem/stdshaders/luminance_compare_ps2x.fxc
@@ -0,0 +1,51 @@
+// STATIC: "CONVERT_TO_SRGB" "0..1"	[ps20b][= g_pHardwareConfig->NeedsShaderSRGBConversion()] [PC]
+// STATIC: "CONVERT_TO_SRGB" "0..0"	[= 0] [XBOX]
+
+#define HDRTYPE HDR_TYPE_NONE
+#include "common_ps_fxc.h"
+
+// This pixel shader compares the luminance against a constant value and retruns all 1's when greater
+
+sampler TexSampler	: register( s0 );
+
+struct PS_INPUT
+{
+	float2 uv0						: TEXCOORD0;
+
+#if defined( _X360 ) //matching pixel shader inputs to vertex shader outputs to avoid shader patches	
+	float2 ZeroTexCoord				: TEXCOORD1;
+	float2 bloomTexCoord			: TEXCOORD2;
+#endif
+};
+
+float3 g_vComparisonMinMaxScale : register( c0 );
+#define g_flComparisonMin   g_vComparisonMinMaxScale.x
+#define g_flComparisonMax   g_vComparisonMinMaxScale.y
+#define g_flComparisonScale g_vComparisonMinMaxScale.z
+
+struct PS_OUTPUT
+{
+    float4 color : COLOR0;
+    float  depth : DEPTH;
+};
+
+PS_OUTPUT main( PS_INPUT i )
+{
+	float3 color = tex2D( TexSampler, i.uv0 ) * g_flComparisonScale;
+
+	// Formula for calculating luminance based on NTSC standard
+	float3 tmpv = { 0.2125f, 0.7154f, 0.0721f };
+	float flLuminance = dot( color.rgb, tmpv.rgb );
+
+	// Alternate formula for calculating luminance for linear RGB space (Widely used in color hue and saturation computations)
+	//float3 tmpv = { 0.3086f, 0.6094f, 0.0820f };
+	//float flLuminance = dot( color.rgb, tmpv.rgb );
+
+	// Simple average
+	//float flLuminance = ( color.r + color.g + color.b ) * 0.33333f;
+
+	PS_OUTPUT o;
+	o.color.rgba = step( g_flComparisonMin, flLuminance ) * step( flLuminance, g_flComparisonMax );
+	o.depth = 0.0f;
+	return o;
+}