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"// CoarseInsctr.fx:\n"
"// Renders coarse unshadowed inscattering for EVERY epipolar sample and computes extinction.\n"
"// Coarse inscattering is used to refine sampling, while extinction is then transformed to \n"
"// screen space, if extinction evaluation mode is EXTINCTION_EVAL_MODE_EPIPOLAR\n"
"\n"
"#include \"BasicStructures.fxh\"\n"
"#include \"AtmosphereShadersCommon.fxh\"\n"
"\n"
"cbuffer cbParticipatingMediaScatteringParams\n"
"{\n"
" AirScatteringAttribs g_MediaParams;\n"
"}\n"
"\n"
"cbuffer cbCameraAttribs\n"
"{\n"
" CameraAttribs g_CameraAttribs;\n"
"}\n"
"\n"
"cbuffer cbLightParams\n"
"{\n"
" LightAttribs g_LightAttribs;\n"
"}\n"
"\n"
"cbuffer cbPostProcessingAttribs\n"
"{\n"
" EpipolarLightScatteringAttribs g_PPAttribs;\n"
"};\n"
"\n"
"Texture2D<float2> g_tex2DOccludedNetDensityToAtmTop;\n"
"SamplerState g_tex2DOccludedNetDensityToAtmTop_sampler;\n"
"\n"
"Texture2D<float> g_tex2DEpipolarCamSpaceZ;\n"
"\n"
"Texture2D<float2> g_tex2DCoordinates;\n"
"\n"
"Texture3D<float3> g_tex3DSingleSctrLUT;\n"
"SamplerState g_tex3DSingleSctrLUT_sampler;\n"
"\n"
"Texture3D<float3> g_tex3DHighOrderSctrLUT;\n"
"SamplerState g_tex3DHighOrderSctrLUT_sampler;\n"
"\n"
"Texture3D<float3> g_tex3DMultipleSctrLUT;\n"
"SamplerState g_tex3DMultipleSctrLUT_sampler;\n"
"\n"
"#include \"LookUpTables.fxh\"\n"
"#include \"ScatteringIntegrals.fxh\"\n"
"#include \"Extinction.fxh\"\n"
"#include \"UnshadowedScattering.fxh\"\n"
"\n"
"void ShaderFunctionInternal(in float4 f4Pos,\n"
" out float3 f3Inscattering, \n"
" out float3 f3Extinction)\n"
"{\n"
" // Compute unshadowed inscattering from the camera to the ray end point using few steps\n"
" float fCamSpaceZ = g_tex2DEpipolarCamSpaceZ.Load( uint3(f4Pos.xy, 0) );\n"
" float2 f2SampleLocation = g_tex2DCoordinates.Load( uint3(f4Pos.xy, 0) );\n"
"\n"
" ComputeUnshadowedInscattering(f2SampleLocation, fCamSpaceZ, \n"
" 7u, // Use hard-coded constant here so that compiler can optimize the code\n"
" // more efficiently\n"
" g_PPAttribs.f4EarthCenter.xyz,\n"
" f3Inscattering, f3Extinction);\n"
" f3Inscattering *= g_LightAttribs.f4Intensity.rgb;\n"
"}\n"
"\n"
"// Render inscattering only\n"
"void RenderCoarseUnshadowedInsctrPS(FullScreenTriangleVSOutput VSOut, \n"
" // IMPORTANT: non-system generated pixel shader input\n"
" // arguments must have the exact same name as vertex shader \n"
" // outputs and must go in the same order.\n"
" // Moreover, even if the shader is not using the argument,\n"
" // it still must be declared.\n"
"\n"
" out float4 f4Inscattering : SV_Target0) \n"
"{\n"
" float3 f3Extinction = float3(1.0, 1.0, 1.0);\n"
" ShaderFunctionInternal(VSOut.f4PixelPos, f4Inscattering.rgb, f3Extinction );\n"
" f4Inscattering.a = 1.0;\n"
"}\n"
"\n"
"// Render inscattering and extinction\n"
"void RenderCoarseUnshadowedInsctrAndExtinctionPS(FullScreenTriangleVSOutput VSOut,\n"
" out float4 f4Inscattering : SV_Target0,\n"
" out float4 f4Extinction : SV_Target1) \n"
"{\n"
" ShaderFunctionInternal(VSOut.f4PixelPos, f4Inscattering.rgb, f4Extinction.rgb );\n"
" f4Inscattering.a = 0.0;\n"
" f4Extinction.a = 0.0;\n"
"}\n"
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