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/*
Define the shader permutations for code generation
%% MUX_BEGIN %%

- SAMPLEMODE:
    - SAMPLEMODE_SINGLE
    - SAMPLEMODE_MSAA

%% MUX_END %%
*/

#include "ShaderCommon.h"

#if (SAMPLEMODE == SAMPLEMODE_SINGLE)
Texture2D<float> tDepthMap : register(t0);
#elif (SAMPLEMODE == SAMPLEMODE_MSAA)
Texture2DMS<float> tDepthMap : register(t0);
#endif

uint Unused(uint input)
{
	return input;
}

float main(
	VS_QUAD_OUTPUT input
	, uint sampleID : SV_SAMPLEINDEX 
	) : SV_DEPTH
{
	float2 jitter = float2(0.0f, 0.0f);
	uint2 pixelIdx = uint2(input.vPos.xy);
	if ( (pixelIdx.x+pixelIdx.y)%2 )
	{
		jitter.xy = g_vJitterOffset.xy;
	}
	else
	{
		jitter.xy = g_vJitterOffset.yx;
	}

#if defined(__PSSL__)
	Unused(sampleID);//Fix a compiler warning with pssl.
	float2 tc = (floor(input.vTex.xy*g_vOutputViewportSize) + GetViVjLinearSample() + jitter)*g_vOutputSize_Inv;
#else
	float2 tc = (EvaluateAttributeAtSample(input.vTex.xy, sampleID)*g_vOutputViewportSize + jitter)*g_vOutputSize_Inv;
#endif

#if (SAMPLEMODE == SAMPLEMODE_SINGLE)
	return tDepthMap.SampleLevel(sPoint, tc, 0).x;
#elif (SAMPLEMODE == SAMPLEMODE_MSAA)
	int2 load_tc = int2(tc*g_vOutputSize);
	return tDepthMap.Load(load_tc, 0).x;
#endif
}