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// This code contains NVIDIA Confidential Information and is disclosed
// under the Mutual Non-Disclosure Agreement.
//
// Notice
// ALL NVIDIA DESIGN SPECIFICATIONS AND CODE ("MATERIALS") ARE PROVIDED "AS IS" NVIDIA MAKES
// NO REPRESENTATIONS, WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ANY IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE.
//
// NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. No third party distribution is allowed unless
// expressly authorized by NVIDIA. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// Copyright � 2008- 2013 NVIDIA Corporation. All rights reserved.
//
// NVIDIA Corporation and its licensors retain all intellectual property and proprietary
// rights in and to this software and related documentation and any modifications thereto.
// Any use, reproduction, disclosure or distribution of this software and related
// documentation without an express license agreement from NVIDIA Corporation is
// strictly prohibited.
//
#include "ocean_shader_common.h"
//------------------------------------------------------------------------------------
// Global variables
//------------------------------------------------------------------------------------
Texture3D g_PSMMap;
RWTexture3D<uint> g_PSMPropagationMapUAV;
//------------------------------------------------------------------------------------
// Constants
//------------------------------------------------------------------------------------
static const float2 kQuadCornerUVs[] = {
float2(0.f,0.f),
float2(0.f,1.f),
float2(1.f,0.f),
float2(1.f,1.f)
};
//-----------------------------------------------------------------------------------
// Texture & Samplers
//-----------------------------------------------------------------------------------
SamplerState g_SamplerPSMUI
{
Filter = MIN_MAG_MIP_POINT;
AddressU = Clamp;
AddressV = Clamp;
AddressW = Clamp;
};
//--------------------------------------------------------------------------------------
// DepthStates
//--------------------------------------------------------------------------------------
DepthStencilState NoDepthStencil
{
DepthEnable = FALSE;
StencilEnable = FALSE;
};
//--------------------------------------------------------------------------------------
// RasterStates
//--------------------------------------------------------------------------------------
RasterizerState SolidNoCull
{
FillMode = SOLID;
CullMode = NONE;
MultisampleEnable = True;
};
//--------------------------------------------------------------------------------------
// BlendStates
//--------------------------------------------------------------------------------------
BlendState Opaque
{
BlendEnable[0] = FALSE;
RenderTargetWriteMask[0] = 0xF;
};
//--------------------------------------------------------------------------------------
// Structs
//--------------------------------------------------------------------------------------
struct VS_UI_OUT
{
float4 position : SV_Position;
float2 uv : TEXCOORD;
};
//--------------------------------------------------------------------------------------
// Functions
//--------------------------------------------------------------------------------------
VS_UI_OUT QuadToUIVS(uint vID : SV_VertexID) {
VS_UI_OUT o;
o.uv = kQuadCornerUVs[vID % 4];
o.position.xy = 0.5 * o.uv - 1.f;
o.position.z = 0.5f;
o.position.w = 1.f;
return o;
}
float4 PSMToUIPS(VS_UI_OUT i) : SV_Target
{
int PSMMapW, PSMMapH, PSMMapD;
g_PSMMap.GetDimensions(PSMMapW, PSMMapH, PSMMapD);
float tile_wh = ceil(sqrt(float(PSMMapD)));
float2 tile_coord = i.uv * tile_wh;
float2 tile_xy = floor(tile_coord);
float2 within_tile_xy = frac(tile_coord);
float slice = (tile_xy.y * tile_wh + tile_xy.x);
return g_PSMMap.Sample(g_SamplerPSMUI,float3(within_tile_xy,slice/float(PSMMapD)));
}
[numthreads(PSMPropagationCSBlockSize,PSMPropagationCSBlockSize,1)]
void PSMPropagationCS( uint3 Gid : SV_GroupID, uint3 DTid : SV_DispatchThreadID, uint3 GTid : SV_GroupThreadID, uint GI : SV_GroupIndex )
{
uint PSMMapW, PSMMapH, PSMMapD;
g_PSMPropagationMapUAV.GetDimensions(PSMMapW, PSMMapH, PSMMapD);
// TBD: Would it be worth doing away with this by insisting on multiple-of-block-size dims?
if(DTid.x >= PSMMapW || DTid.y >= PSMMapH)
return;
float AccumulatedOpacity = 1.f;
uint2 PixelCoords = DTid.xy;
/*
// Early-out if there is no coverage on this coverage slice
float Coverage = g_PSMCoverageTexture[int2(PixelCoords/PSM_COVERAGE_MULTIPLIER)].r;
if(Coverage == 0.f)
return;
*/
// Skip layer 0, which is reserved for coverage
for(uint layer = 1; layer < PSMMapD; ++layer)
{
uint ReadVal = g_PSMPropagationMapUAV[int3(PixelCoords,layer)];
uint RReadVal = ReadVal & 0x0000FFFF;
uint GReadVal = ReadVal >> 16;
float LocalOpacity1 = float(RReadVal) * 1.f/65535.f;
float LocalOpacity2 = float(GReadVal) * 1.f/65535.f;
float AccumulatedOpacityTemp = AccumulatedOpacity * LocalOpacity1;
AccumulatedOpacity = AccumulatedOpacityTemp * LocalOpacity2;
if(AccumulatedOpacity < 1.f)
{
uint RWriteVal = 65535.f * AccumulatedOpacityTemp;
uint GWriteVal = 65535.f * AccumulatedOpacity;
uint WriteVal = RWriteVal + (GWriteVal << 16);
g_PSMPropagationMapUAV[int3(PixelCoords,layer)] = WriteVal;
}
}
}
//--------------------------------------------------------------------------------------
// Techniques
//--------------------------------------------------------------------------------------
technique11 PropagatePSMTech
{
pass
{
SetVertexShader( NULL );
SetGeometryShader( NULL );
SetHullShader( NULL );
SetDomainShader( NULL );
SetPixelShader( NULL );
SetComputeShader( CompileShader( cs_5_0, PSMPropagationCS() ) );
}
}
technique11 RenderPSMToUITech
{
pass
{
SetVertexShader( CompileShader( vs_4_0, QuadToUIVS() ) );
SetGeometryShader( NULL );
SetHullShader( NULL );
SetDomainShader( NULL );
SetPixelShader( CompileShader( ps_4_0, PSMToUIPS() ) );
SetDepthStencilState( NoDepthStencil, 0 );
SetRasterizerState( SolidNoCull );
SetBlendState( Opaque, float4( 0.0f, 0.0f, 0.0f, 0.0f ), 0xFFFFFFFF );
}
}
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