327 lines
9.6 KiB
C
327 lines
9.6 KiB
C
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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#ifndef COMMON_FXC_H_
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#define COMMON_FXC_H_
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#include "common_pragmas.h"
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#include "common_hlsl_cpp_consts.h"
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#ifdef NV3X
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# define HALF half
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# define HALF2 half2
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# define HALF3 half3
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# define HALF4 half4
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# define HALF3x3 half3x3
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# define HALF3x4 half3x4
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# define HALF4x3 half4x3
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# define HALF_CONSTANT( _constant ) ((HALF)_constant)
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#else
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# define HALF float
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# define HALF2 float2
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# define HALF3 float3
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# define HALF4 float4
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# define HALF3x3 float3x3
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# define HALF3x4 float3x4
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# define HALF4x3 float4x3
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# define HALF_CONSTANT( _constant ) _constant
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#endif
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// This is where all common code for both vertex and pixel shaders.
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#define OO_SQRT_3 0.57735025882720947f
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static const HALF3 bumpBasis[3] = {
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HALF3( 0.81649661064147949f, 0.0f, OO_SQRT_3 ),
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HALF3( -0.40824833512306213f, 0.70710676908493042f, OO_SQRT_3 ),
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HALF3( -0.40824821591377258f, -0.7071068286895752f, OO_SQRT_3 )
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};
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static const HALF3 bumpBasisTranspose[3] = {
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HALF3( 0.81649661064147949f, -0.40824833512306213f, -0.40824833512306213f ),
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HALF3( 0.0f, 0.70710676908493042f, -0.7071068286895752f ),
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HALF3( OO_SQRT_3, OO_SQRT_3, OO_SQRT_3 )
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};
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#if defined( _X360 )
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#define REVERSE_DEPTH_ON_X360 //uncomment to use D3DFMT_D24FS8 with an inverted depth viewport for better performance. Keep this in sync with the same named #define in public/shaderapi/shareddefs.h
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//Note that the reversal happens in the viewport. So ONLY reading back from a depth texture should be affected. Projected math is unaffected.
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#endif
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HALF3 CalcReflectionVectorNormalized( HALF3 normal, HALF3 eyeVector )
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{
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// FIXME: might be better of normalizing with a normalizing cube map and
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// get rid of the dot( normal, normal )
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// compute reflection vector r = 2 * ((n dot v)/(n dot n)) n - v
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return 2.0 * ( dot( normal, eyeVector ) / dot( normal, normal ) ) * normal - eyeVector;
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}
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HALF3 CalcReflectionVectorUnnormalized( HALF3 normal, HALF3 eyeVector )
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{
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// FIXME: might be better of normalizing with a normalizing cube map and
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// get rid of the dot( normal, normal )
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// compute reflection vector r = 2 * ((n dot v)/(n dot n)) n - v
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// multiply all values through by N.N. uniformly scaling reflection vector won't affect result
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// since it is used in a cubemap lookup
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return (2.0*(dot( normal, eyeVector ))*normal) - (dot( normal, normal )*eyeVector);
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}
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float3 HuePreservingColorClamp( float3 c )
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{
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// Get the max of all of the color components and a specified maximum amount
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float maximum = max( max( c.x, c.y ), max( c.z, 1.0f ) );
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return (c / maximum);
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}
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HALF3 HuePreservingColorClamp( HALF3 c, HALF maxVal )
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{
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// Get the max of all of the color components and a specified maximum amount
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float maximum = max( max( c.x, c.y ), max( c.z, maxVal ) );
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return (c * ( maxVal / maximum ) );
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}
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#if (AA_CLAMP==1)
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HALF2 ComputeLightmapCoordinates( HALF4 Lightmap1and2Coord, HALF2 Lightmap3Coord )
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{
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HALF2 result = saturate(Lightmap1and2Coord.xy) * Lightmap1and2Coord.wz * 0.99;
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result += Lightmap3Coord;
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return result;
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}
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void ComputeBumpedLightmapCoordinates( HALF4 Lightmap1and2Coord, HALF2 Lightmap3Coord,
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out HALF2 bumpCoord1,
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out HALF2 bumpCoord2,
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out HALF2 bumpCoord3 )
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{
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HALF2 result = saturate(Lightmap1and2Coord.xy) * Lightmap1and2Coord.wz * 0.99;
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result += Lightmap3Coord;
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bumpCoord1 = result + HALF2(Lightmap1and2Coord.z, 0);
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bumpCoord2 = result + 2*HALF2(Lightmap1and2Coord.z, 0);
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bumpCoord3 = result + 3*HALF2(Lightmap1and2Coord.z, 0);
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}
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#else
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HALF2 ComputeLightmapCoordinates( HALF4 Lightmap1and2Coord, HALF2 Lightmap3Coord )
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{
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return Lightmap1and2Coord.xy;
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}
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void ComputeBumpedLightmapCoordinates( HALF4 Lightmap1and2Coord, HALF2 Lightmap3Coord,
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out HALF2 bumpCoord1,
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out HALF2 bumpCoord2,
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out HALF2 bumpCoord3 )
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{
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bumpCoord1 = Lightmap1and2Coord.xy;
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bumpCoord2 = Lightmap1and2Coord.wz; // reversed order!!!
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bumpCoord3 = Lightmap3Coord.xy;
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}
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#endif
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// Versions of matrix multiply functions which force HLSL compiler to explictly use DOTs,
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// not giving it the option of using MAD expansion. In a perfect world, the compiler would
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// always pick the best strategy, and these shouldn't be needed.. but.. well.. umm..
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//
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// lorenmcq
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float3 mul3x3(float3 v, float3x3 m)
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{
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#if !defined( _X360 )
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return float3(dot(v, transpose(m)[0]), dot(v, transpose(m)[1]), dot(v, transpose(m)[2]));
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#else
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// xbox360 fxc.exe (new back end) borks with transposes, generates bad code
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return mul( v, m );
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#endif
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}
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float3 mul4x3(float4 v, float4x3 m)
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{
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#if !defined( _X360 )
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return float3(dot(v, transpose(m)[0]), dot(v, transpose(m)[1]), dot(v, transpose(m)[2]));
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#else
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// xbox360 fxc.exe (new back end) borks with transposes, generates bad code
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return mul( v, m );
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#endif
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}
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float3 DecompressHDR( float4 input )
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{
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return input.rgb * input.a * MAX_HDR_OVERBRIGHT;
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}
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float4 CompressHDR( float3 input )
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{
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// FIXME: want to use min so that we clamp to white, but what happens if we
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// have an albedo component that's less than 1/MAX_HDR_OVERBRIGHT?
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// float fMax = max( max( color.r, color.g ), color.b );
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float4 output;
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float fMax = min( min( input.r, input.g ), input.b );
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if( fMax > 1.0f )
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{
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float oofMax = 1.0f / fMax;
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output.rgb = oofMax * input.rgb;
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output.a = min( fMax / MAX_HDR_OVERBRIGHT, 1.0f );
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}
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else
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{
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output.rgb = input.rgb;
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output.a = 0.0f;
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}
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return output;
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}
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float3 LinearToGamma( const float3 f3linear )
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{
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return pow( f3linear, 1.0f / 2.2f );
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}
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float4 LinearToGamma( const float4 f4linear )
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{
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return float4( pow( f4linear.xyz, 1.0f / 2.2f ), f4linear.w );
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}
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float LinearToGamma( const float f1linear )
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{
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return pow( f1linear, 1.0f / 2.2f );
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}
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float3 GammaToLinear( const float3 gamma )
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{
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return pow( gamma, 2.2f );
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}
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float4 GammaToLinear( const float4 gamma )
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{
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return float4( pow( gamma.xyz, 2.2f ), gamma.w );
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}
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float GammaToLinear( const float gamma )
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{
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return pow( gamma, 2.2f );
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}
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// These two functions use the actual sRGB math
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float SrgbGammaToLinear( float flSrgbGammaValue )
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{
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float x = saturate( flSrgbGammaValue );
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return ( x <= 0.04045f ) ? ( x / 12.92f ) : ( pow( ( x + 0.055f ) / 1.055f, 2.4f ) );
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}
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float SrgbLinearToGamma( float flLinearValue )
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{
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float x = saturate( flLinearValue );
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return ( x <= 0.0031308f ) ? ( x * 12.92f ) : ( 1.055f * pow( x, ( 1.0f / 2.4f ) ) ) - 0.055f;
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}
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// These twofunctions use the XBox 360's exact piecewise linear algorithm
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float X360GammaToLinear( float fl360GammaValue )
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{
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float flLinearValue;
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fl360GammaValue = saturate( fl360GammaValue );
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if ( fl360GammaValue < ( 96.0f / 255.0f ) )
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{
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if ( fl360GammaValue < ( 64.0f / 255.0f ) )
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{
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flLinearValue = fl360GammaValue * 255.0f;
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}
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else
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{
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flLinearValue = fl360GammaValue * ( 255.0f * 2.0f ) - 64.0f;
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flLinearValue += floor( flLinearValue * ( 1.0f / 512.0f ) );
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}
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}
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else
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{
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if( fl360GammaValue < ( 192.0f / 255.0f ) )
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{
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flLinearValue = fl360GammaValue * ( 255.0f * 4.0f ) - 256.0f;
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flLinearValue += floor( flLinearValue * ( 1.0f / 256.0f ) );
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}
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else
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{
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flLinearValue = fl360GammaValue * ( 255.0f * 8.0f ) - 1024.0f;
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flLinearValue += floor( flLinearValue * ( 1.0f / 128.0f ) );
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}
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}
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flLinearValue *= 1.0f / 1023.0f;
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flLinearValue = saturate( flLinearValue );
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return flLinearValue;
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}
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float X360LinearToGamma( float flLinearValue )
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{
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float fl360GammaValue;
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flLinearValue = saturate( flLinearValue );
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if ( flLinearValue < ( 128.0f / 1023.0f ) )
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{
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if ( flLinearValue < ( 64.0f / 1023.0f ) )
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{
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fl360GammaValue = flLinearValue * ( 1023.0f * ( 1.0f / 255.0f ) );
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}
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else
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{
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fl360GammaValue = flLinearValue * ( ( 1023.0f / 2.0f ) * ( 1.0f / 255.0f ) ) + ( 32.0f / 255.0f );
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}
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}
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else
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{
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if ( flLinearValue < ( 512.0f / 1023.0f ) )
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{
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fl360GammaValue = flLinearValue * ( ( 1023.0f / 4.0f ) * ( 1.0f / 255.0f ) ) + ( 64.0f / 255.0f );
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}
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else
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{
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fl360GammaValue = flLinearValue * ( ( 1023.0f /8.0f ) * ( 1.0f / 255.0f ) ) + ( 128.0f /255.0f ); // 1.0 -> 1.0034313725490196078431372549016
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if ( fl360GammaValue > 1.0f )
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{
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fl360GammaValue = 1.0f;
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}
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}
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}
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fl360GammaValue = saturate( fl360GammaValue );
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return fl360GammaValue;
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}
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float SrgbGammaTo360Gamma( float flSrgbGammaValue )
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{
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float flLinearValue = SrgbGammaToLinear( flSrgbGammaValue );
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float fl360GammaValue = X360LinearToGamma( flLinearValue );
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return fl360GammaValue;
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}
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float3 Vec3WorldToTangent( float3 iWorldVector, float3 iWorldNormal, float3 iWorldTangent, float3 iWorldBinormal )
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{
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float3 vTangentVector;
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vTangentVector.x = dot( iWorldVector.xyz, iWorldTangent.xyz );
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vTangentVector.y = dot( iWorldVector.xyz, iWorldBinormal.xyz );
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vTangentVector.z = dot( iWorldVector.xyz, iWorldNormal.xyz );
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return vTangentVector.xyz; // Return without normalizing
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}
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float3 Vec3WorldToTangentNormalized( float3 iWorldVector, float3 iWorldNormal, float3 iWorldTangent, float3 iWorldBinormal )
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{
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return normalize( Vec3WorldToTangent( iWorldVector, iWorldNormal, iWorldTangent, iWorldBinormal ) );
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}
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float3 Vec3TangentToWorld( float3 iTangentVector, float3 iWorldNormal, float3 iWorldTangent, float3 iWorldBinormal )
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{
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float3 vWorldVector;
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vWorldVector.xyz = iTangentVector.x * iWorldTangent.xyz;
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vWorldVector.xyz += iTangentVector.y * iWorldBinormal.xyz;
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vWorldVector.xyz += iTangentVector.z * iWorldNormal.xyz;
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return vWorldVector.xyz; // Return without normalizing
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}
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float3 Vec3TangentToWorldNormalized( float3 iTangentVector, float3 iWorldNormal, float3 iWorldTangent, float3 iWorldBinormal )
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{
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return normalize( Vec3TangentToWorld( iTangentVector, iWorldNormal, iWorldTangent, iWorldBinormal ) );
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}
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#endif //#ifndef COMMON_FXC_H_
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