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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 "GFSDK_WaveWorks_Common.fxh"
#ifdef GFSDK_WAVEWORKS_GL
#define DECLARE_ATTR_CONSTANT(Type,Label,Regoff) uniform Type Label
#define DECLARE_ATTR_SAMPLER(Label,TextureLabel,Regoff) \
uniform sampler2D TextureLabel
#else
#define DECLARE_ATTR_CONSTANT(Type,Label,Regoff) Type Label : register(c##Regoff)
#define DECLARE_ATTR_SAMPLER(Label,TextureLabel,Regoff) \
Texture2D Label : register(t##Regoff); \
SamplerState TextureLabel : register(s##Regoff)
#endif
//------------------------------------------------------------------------------------
// Global variables
//------------------------------------------------------------------------------------
BEGIN_CBUFFER(globals,0)
DECLARE_ATTR_CONSTANT(float4,g_Scales, 0); // was: float g_ChoppyScale, g_GradMap2TexelWSScale
DECLARE_ATTR_CONSTANT(float4,g_OneTexel_Left, 1);
DECLARE_ATTR_CONSTANT(float4,g_OneTexel_Right,2);
DECLARE_ATTR_CONSTANT(float4,g_OneTexel_Back, 3);
DECLARE_ATTR_CONSTANT(float4,g_OneTexel_Front,4);
END_CBUFFER
DECLARE_ATTR_SAMPLER(g_textureDisplacementMap,g_samplerDisplacementMap,0);
#ifdef GFSDK_WAVEWORKS_GL
varying float2 vInterpTexCoord;
#endif
#ifndef GFSDK_WAVEWORKS_OMIT_VS
#ifdef GFSDK_WAVEWORKS_GL
attribute float4 vInPos;
attribute float2 vInTexCoord;
#define vOutPos gl_Position
void main()
#else
void vs(
float4 vInPos SEMANTIC(POSITION),
float2 vInTexCoord SEMANTIC(TEXCOORD0),
out float2 vInterpTexCoord SEMANTIC(TEXCOORD0),
out float4 vOutPos SEMANTIC(SV_Position)
)
#endif
{
// No need to do matrix transform.
vOutPos = vInPos;
// Pass through general texture coordinate.
vInterpTexCoord = vInTexCoord;
}
#endif // !GFSDK_WAVEWORKS_OMIT_VS
#ifndef GFSDK_WAVEWORKS_OMIT_PS
#ifdef GFSDK_WAVEWORKS_GL
#define Output gl_FragColor
void main()
#else
void ps(
float2 vInterpTexCoord SEMANTIC(TEXCOORD0),
out float4 Output SEMANTIC(SV_Target)
)
#endif
{
// Sample neighbour texels
float3 displace_left = SampleTex2D(g_textureDisplacementMap, g_samplerDisplacementMap, vInterpTexCoord.xy + g_OneTexel_Left.xy).rgb;
float3 displace_right = SampleTex2D(g_textureDisplacementMap, g_samplerDisplacementMap, vInterpTexCoord.xy + g_OneTexel_Right.xy).rgb;
float3 displace_back = SampleTex2D(g_textureDisplacementMap, g_samplerDisplacementMap, vInterpTexCoord.xy + g_OneTexel_Back.xy).rgb;
float3 displace_front = SampleTex2D(g_textureDisplacementMap, g_samplerDisplacementMap, vInterpTexCoord.xy + g_OneTexel_Front.xy).rgb;
// -------- Do not store the actual normal value, instead, it preserves two differential values.
float2 gradient = float2(-(displace_right.z - displace_left.z) / max(0.01,1.0 + g_Scales.y*(displace_right.x - displace_left.x)), -(displace_front.z - displace_back.z) / max(0.01,1.0+g_Scales.y*(displace_front.y - displace_back.y)));
//float2 gradient = {-(displace_right.z - displace_left.z), -(displace_front.z - displace_back.z) };
// Calculate Jacobian corelation from the partial differential of displacement field
float2 Dx = (displace_right.xy - displace_left.xy) * g_Scales.x;
float2 Dy = (displace_front.xy - displace_back.xy) * g_Scales.x;
float J = (1.0f + Dx.x) * (1.0f + Dy.y) - Dx.y * Dy.x;
// Output
Output = float4(gradient, J, 0);
}
#endif // !GFSDK_WAVEWORKS_OMIT_PS
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