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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 (c) 2003 - 2016 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.
//
/*
Define the shader permutations for code generation
%% MUX_BEGIN %%
- LIGHTMODE:
- LIGHTMODE_DIRECTIONAL
- LIGHTMODE_SPOTLIGHT
- LIGHTMODE_OMNI
%% MUX_END %%
*/
////////////////////////////////////////////////////////////////////////////////
// Resources
SamplerComparisonState sampShadowmap : register(s0);
#if (LIGHTMODE == LIGHTMODE_DIRECTIONAL || LIGHTMODE == LIGHTMODE_SPOTLIGHT)
Texture2D<float> tShadowmap : register(t0);
#elif (LIGHTMODE == LIGHTMODE_OMNI)
Texture2DArray <float1> tShadowmapArray : register(t0);
#endif
////////////////////////////////////////////////////////////////////////////////
// Constant Buffers
cbuffer CameraCB : register( b0 )
{
column_major float4x4 c_mViewProj : packoffset(c0);
float3 c_vEyePos : packoffset(c4);
float c_fZNear : packoffset(c5);
float c_fZFar : packoffset(c5.y);
};
cbuffer ObjectCB : register( b1 )
{
column_major float4x4 c_mObject : packoffset(c0);
float3 c_vObjectColor : packoffset(c4);
};
cbuffer LightCB : register( b2 )
{
column_major float4x4 c_mLightViewProj : packoffset(c0);
float3 c_vLightDirection : packoffset(c4);
float c_fLightFalloffCosTheta : packoffset(c4.w);
float3 c_vLightPos : packoffset(c5);
float c_fLightFalloffPower : packoffset(c5.w);
float3 c_vLightColor : packoffset(c6);
float4 c_vLightAttenuationFactors : packoffset(c7);
float c_fLightZNear : packoffset(c8);
float c_fLightZFar : packoffset(c8.y);
float3 c_vSigmaExtinction : packoffset(c9);
};
////////////////////////////////////////////////////////////////////////////////
// IO Structures
struct VS_OUTPUT
{
float4 ScreenP : SV_POSITION;
float4 P : TEXCOORD0;
float3 N : NORMAL0;
};
////////////////////////////////////////////////////////////////////////////////
// Pixel Shader
float3 ParaboloidProject(float3 P, float zNear, float zFar)
{
float3 outP;
float lenP = length(P.xyz);
outP.xyz = P.xyz/lenP;
outP.x = outP.x / (outP.z + 1);
outP.y = outP.y / (outP.z + 1);
outP.z = (lenP - zNear) / (zFar - zNear);
return outP;
}
float4 main(VS_OUTPUT input) : SV_Target0
{
float3 P = input.P.xyz / input.P.w;
float3 N = normalize(input.N);
float3 Kd = c_vObjectColor;
//return float4(0.5*(N+1), 1);
const float SHADOW_BIAS = -0.001f;
float4 shadow_clip = mul(c_mLightViewProj, float4(P,1));
shadow_clip = shadow_clip / shadow_clip.w;
uint hemisphereID = (shadow_clip.z > 0) ? 0 : 1;
if (LIGHTMODE == LIGHTMODE_OMNI)
{
shadow_clip.z = abs(shadow_clip.z);
shadow_clip.xyz = ParaboloidProject(shadow_clip.xyz, c_fLightZNear, c_fLightZFar);
}
float2 shadow_tc = float2(0.5f, -0.5f)*shadow_clip.xy + 0.5f;
float receiver_depth = shadow_clip.z+SHADOW_BIAS;
float total_light = 0;
const int SHADOW_KERNEL = 2;
[unroll]
for (int ox=-SHADOW_KERNEL; ox<=SHADOW_KERNEL; ++ox)
{
[unroll]
for (int oy=-SHADOW_KERNEL; oy<=SHADOW_KERNEL; ++oy)
{
#if (LIGHTMODE == LIGHTMODE_OMNI)
total_light += tShadowmapArray.SampleCmpLevelZero(sampShadowmap, float3(shadow_tc, hemisphereID), receiver_depth, int2(ox, oy)).x;
#else
total_light += tShadowmap.SampleCmpLevelZero(sampShadowmap, shadow_tc, receiver_depth, int2(ox, oy)).x;
#endif
}
}
float shadow_term = total_light / ((2*SHADOW_KERNEL+1) * (2*SHADOW_KERNEL+1));
float3 output = float3(0,0,0);
float3 L = -c_vLightDirection;
if (LIGHTMODE == LIGHTMODE_DIRECTIONAL)
{
float3 attenuation = shadow_term*dot(N, L);
float3 ambient = 0.001f*saturate(0.5f*(dot(N, L)+1.0f));
output += c_vLightColor*max(attenuation, ambient);
}
else if (LIGHTMODE == LIGHTMODE_SPOTLIGHT)
{
float light_to_world = length(P - c_vLightPos);
float3 W = (c_vLightPos - P)/light_to_world;
float distance_attenuation = 1.0f/(c_vLightAttenuationFactors.x + c_vLightAttenuationFactors.y*light_to_world + c_vLightAttenuationFactors.z*light_to_world*light_to_world) + c_vLightAttenuationFactors.w;
const float ANGLE_EPSILON = 0.00001f;
float angle_factor = saturate((dot(N, L)-c_fLightFalloffCosTheta)/(1-c_fLightFalloffCosTheta));
float spot_attenuation = (angle_factor > ANGLE_EPSILON) ? pow(angle_factor, c_fLightFalloffPower) : 0.0f;
float3 attenuation = distance_attenuation*spot_attenuation*shadow_term*dot(N, W);
float3 ambient = 0.00001f*saturate(0.5f*(dot(N, L)+1.0f));
output += c_vLightColor*max(attenuation, ambient)*exp(-c_vSigmaExtinction*light_to_world);
}
else if (LIGHTMODE == LIGHTMODE_OMNI)
{
float light_to_world = length(P - c_vLightPos);
float3 W = (c_vLightPos - P)/light_to_world;
float distance_attenuation = 1.0f/(c_vLightAttenuationFactors.x + c_vLightAttenuationFactors.y*light_to_world + c_vLightAttenuationFactors.z*light_to_world*light_to_world) + c_vLightAttenuationFactors.w;
float3 attenuation = distance_attenuation*shadow_term*dot(N, W);
float3 ambient = 0.00001f*saturate(0.5f*(dot(N, L)+1.0f));
output += c_vLightColor*max(attenuation, ambient)*exp(-c_vSigmaExtinction*light_to_world);
}
return float4(output, 1);
}
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