1

materialsystem/stdshaders/sample4x4log_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"
+
+
+sampler TexSampler	: register( s0 );
+
+struct PS_INPUT
+{
+	float2 coordTap0				: TEXCOORD0;
+	float2 coordTap1				: TEXCOORD1;
+	float2 coordTap2				: TEXCOORD2;
+	float2 coordTap3				: TEXCOORD3;
+};
+
+float AlphaConst : register( c0 );
+
+#define LOG_EPSILON 0.000001
+
+float luminance(float3 color) : FLOAT
+{
+	return 0.2125*color.x+0.7154*color.y+0.0721*color.z;
+}
+
+float logluminance(float3 color) : FLOAT
+{
+	return log(0.2125*color.x+0.7154*color.y+0.0721*color.z+LOG_EPSILON);
+}
+
+float4 main( PS_INPUT i ) : COLOR
+{
+	float3 s0, s1, s2, s3;
+
+	// Sample 4 taps. We use the trick of sampling four taps with bilinear in order
+	// to average 16 texels.
+	s0 = tex2D( TexSampler, i.coordTap0);
+	s1 = tex2D( TexSampler, i.coordTap1);
+	s2 = tex2D( TexSampler, i.coordTap2);
+	s3 = tex2D( TexSampler, i.coordTap3);
+	float maxlum=max(max(luminance(s0),luminance(s1)),max(luminance(s2),luminance(s3)));
+	float loglum0=logluminance(s0);
+	float loglum1=logluminance(s1);
+	float loglum2=logluminance(s2);
+	float loglum3=logluminance(s3);
+
+//	return float4(0.25*(loglum0+loglum1+loglum2+loglum3),maxlum,0,1);
+	return FinalOutput( float4(0.25*(loglum0+loglum1+loglum2+loglum3),0,.5,AlphaConst), 0, PIXEL_FOG_TYPE_NONE, TONEMAP_SCALE_NONE );
+}
+