Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $Header: $
// $NoKeywords: $
//=============================================================================//
#ifndef FLOAT_BM_H
#define FLOAT_BM_H
#ifdef _WIN32
#pragma once
#endif
#include <tier0/platform.h>
#include "tier0/dbg.h"
#include <mathlib/mathlib.h>
struct PixRGBAF
{
float Red;
float Green;
float Blue;
float Alpha;
};
struct PixRGBA8
{
unsigned char Red;
unsigned char Green;
unsigned char Blue;
unsigned char Alpha;
};
inline PixRGBAF PixRGBA8_to_F( PixRGBA8 const &x )
{
PixRGBAF f;
f.Red = x.Red / 255.f;
f.Green = x.Green / 255.f;
f.Blue = x.Blue / 255.f;
f.Alpha = x.Alpha / 255.f;
return f;
}
inline PixRGBA8 PixRGBAF_to_8( PixRGBAF const &f )
{
PixRGBA8 x;
x.Red = max( 0.f, min( 255.f,255.f*f.Red ) );
x.Green = max( 0.f, min( 255.f,255.f*f.Green ) );
x.Blue = max( 0.f, min( 255.f,255.f*f.Blue ) );
x.Alpha = max( 0.f, min( 255.f,255.f*f.Alpha ) );
return x;
}
#define SPFLAGS_MAXGRADIENT 1
// bit flag options for ComputeSelfShadowedBumpmapFromHeightInAlphaChannel:
#define SSBUMP_OPTION_NONDIRECTIONAL 1 // generate ambient occlusion only
#define SSBUMP_MOD2X_DETAIL_TEXTURE 2 // scale so that a flat unshadowed
// value is 0.5, and bake rgb luminance
// in.
class FloatBitMap_t
{
public:
int Width, Height; // bitmap dimensions
float *RGBAData; // actual data
FloatBitMap_t(void) // empty one
{
Width=Height=0;
RGBAData=0;
}
FloatBitMap_t(int width, int height); // make one and allocate space
FloatBitMap_t(char const *filename); // read one from a file (tga or pfm)
FloatBitMap_t(FloatBitMap_t const *orig);
// quantize one to 8 bits
bool WriteTGAFile(char const *filename) const;
bool LoadFromPFM(char const *filename); // load from floating point pixmap (.pfm) file
bool WritePFM(char const *filename); // save to floating point pixmap (.pfm) file
void InitializeWithRandomPixelsFromAnotherFloatBM(FloatBitMap_t const &other);
inline float & Pixel(int x, int y, int comp) const
{
Assert((x>=0) && (x<Width));
Assert((y>=0) && (y<Height));
return RGBAData[4*(x+Width*y)+comp];
}
inline float & PixelWrapped(int x, int y, int comp) const
{
// like Pixel except wraps around to other side
if (x < 0)
x+=Width;
else
if (x>= Width)
x -= Width;
if ( y < 0 )
y+=Height;
else
if ( y >= Height )
y -= Height;
return RGBAData[4*(x+Width*y)+comp];
}
inline float & PixelClamped(int x, int y, int comp) const
{
// like Pixel except wraps around to other side
x=clamp(x,0,Width-1);
y=clamp(y,0,Height-1);
return RGBAData[4*(x+Width*y)+comp];
}
inline float & Alpha(int x, int y) const
{
Assert((x>=0) && (x<Width));
Assert((y>=0) && (y<Height));
return RGBAData[3+4*(x+Width*y)];
}
// look up a pixel value with bilinear interpolation
float InterpolatedPixel(float x, float y, int comp) const;
inline PixRGBAF PixelRGBAF(int x, int y) const
{
Assert((x>=0) && (x<Width));
Assert((y>=0) && (y<Height));
PixRGBAF RetPix;
int RGBoffset= 4*(x+Width*y);
RetPix.Red= RGBAData[RGBoffset+0];
RetPix.Green= RGBAData[RGBoffset+1];
RetPix.Blue= RGBAData[RGBoffset+2];
RetPix.Alpha= RGBAData[RGBoffset+3];
return RetPix;
}
inline void WritePixelRGBAF(int x, int y, PixRGBAF value) const
{
Assert((x>=0) && (x<Width));
Assert((y>=0) && (y<Height));
int RGBoffset= 4*(x+Width*y);
RGBAData[RGBoffset+0]= value.Red;
RGBAData[RGBoffset+1]= value.Green;
RGBAData[RGBoffset+2]= value.Blue;
RGBAData[RGBoffset+3]= value.Alpha;
}
inline void WritePixel(int x, int y, int comp, float value)
{
Assert((x>=0) && (x<Width));
Assert((y>=0) && (y<Height));
RGBAData[4*(x+Width*y)+comp]= value;
}
// paste, performing boundary matching. Alpha channel can be used to make
// brush shape irregular
void SmartPaste(FloatBitMap_t const &brush, int xofs, int yofs, uint32 flags);
// force to be tileable using poisson formula
void MakeTileable(void);
void ReSize(int NewXSize, int NewYSize);
// find the bounds of the area that has non-zero alpha.
void GetAlphaBounds(int &minx, int &miny, int &maxx,int &maxy);
// Solve the poisson equation for an image. The alpha channel of the image controls which
// pixels are "modifiable", and can be used to set boundary conditions. Alpha=0 means the pixel
// is locked. deltas are in the order [(x,y)-(x,y-1),(x,y)-(x-1,y),(x,y)-(x+1,y),(x,y)-(x,y+1)
void Poisson(FloatBitMap_t *deltas[4],
int n_iters,
uint32 flags // SPF_xxx
);
FloatBitMap_t *QuarterSize(void) const; // get a new one downsampled
FloatBitMap_t *QuarterSizeBlocky(void) const; // get a new one downsampled
FloatBitMap_t *QuarterSizeWithGaussian(void) const; // downsample 2x using a gaussian
void RaiseToPower(float pow);
void ScaleGradients(void);
void Logize(void); // pix=log(1+pix)
void UnLogize(void); // pix=exp(pix)-1
// compress to 8 bits converts the hdr texture to an 8 bit texture, encoding a scale factor
// in the alpha channel. upon return, the original pixel can be (approximately) recovered
// by the formula rgb*alpha*overbright.
// this function performs special numerical optimization on the texture to minimize the error
// when using bilinear filtering to read the texture.
void CompressTo8Bits(float overbright);
// decompress a bitmap converted by CompressTo8Bits
void Uncompress(float overbright);
Vector AverageColor(void); // average rgb value of all pixels
float BrightestColor(void); // highest vector magnitude
void Clear(float r, float g, float b, float alpha); // set all pixels to speicifed values (0..1 nominal)
void ScaleRGB(float scale_factor); // for all pixels, r,g,b*=scale_factor
// given a bitmap with height stored in the alpha channel, generate vector positions and normals
void ComputeVertexPositionsAndNormals( float flHeightScale, Vector **ppPosOut, Vector **ppNormalOut ) const;
// generate a normal map with height stored in alpha. uses hl2 tangent basis to support baked
// self shadowing. the bump scale maps the height of a pixel relative to the edges of the
// pixel. This function may take a while - many millions of rays may be traced. applications
// using this method need to link w/ raytrace.lib
FloatBitMap_t *ComputeSelfShadowedBumpmapFromHeightInAlphaChannel(
float bump_scale, int nrays_to_trace_per_pixel=100,
uint32 nOptionFlags = 0 // SSBUMP_OPTION_XXX
) const;
// generate a conventional normal map from a source with height stored in alpha.
FloatBitMap_t *ComputeBumpmapFromHeightInAlphaChannel( float bump_scale ) const ;
// bilateral (edge preserving) smoothing filter. edge_threshold_value defines the difference in
// values over which filtering will not occur. Each channel is filtered independently. large
// radii will run slow, since the bilateral filter is neither separable, nor is it a
// convolution that can be done via fft.
void TileableBilateralFilter( int radius_in_pixels, float edge_threshold_value );
~FloatBitMap_t();
void AllocateRGB(int w, int h)
{
if (RGBAData) delete[] RGBAData;
RGBAData=new float[w*h*4];
Width=w;
Height=h;
}
};
// a FloatCubeMap_t holds the floating point bitmaps for 6 faces of a cube map
class FloatCubeMap_t
{
public:
FloatBitMap_t face_maps[6];
FloatCubeMap_t(int xfsize, int yfsize)
{
// make an empty one with face dimensions xfsize x yfsize
for(int f=0;f<6;f++)
face_maps[f].AllocateRGB(xfsize,yfsize);
}
// load basenamebk,pfm, basenamedn.pfm, basenameft.pfm, ...
FloatCubeMap_t(char const *basename);
// save basenamebk,pfm, basenamedn.pfm, basenameft.pfm, ...
void WritePFMs(char const *basename);
Vector AverageColor(void)
{
Vector ret(0,0,0);
int nfaces=0;
for(int f=0;f<6;f++)
{
if (face_maps[f].RGBAData)
{
nfaces++;
ret+=face_maps[f].AverageColor();
}
}
if (nfaces)
ret*=(1.0/nfaces);
return ret;
}
float BrightestColor(void)
{
float ret=0.0;
int nfaces=0;
for(int f=0;f<6;f++)
{
if (face_maps[f].RGBAData)
{
nfaces++;
ret=max(ret,face_maps[f].BrightestColor());
}
}
return ret;
}
// resample a cubemap to one of possibly a lower resolution, using a given phong exponent.
// dot-product weighting will be used for the filtering operation.
void Resample(FloatCubeMap_t &dest, float flPhongExponent);
// returns the normalized direciton vector through a given pixel of a given face
Vector PixelDirection(int face, int x, int y);
// returns the direction vector throught the center of a cubemap face
Vector FaceNormal( int nFaceNumber );
};
static inline float FLerp(float f1, float f2, float t)
{
return f1+(f2-f1)*t;
}
// Image Pyramid class.
#define MAX_IMAGE_PYRAMID_LEVELS 16 // up to 64kx64k
enum ImagePyramidMode_t
{
PYRAMID_MODE_GAUSSIAN,
};
class FloatImagePyramid_t
{
public:
int m_nLevels;
FloatBitMap_t *m_pLevels[MAX_IMAGE_PYRAMID_LEVELS]; // level 0 is highest res
FloatImagePyramid_t(void)
{
m_nLevels=0;
memset(m_pLevels,0,sizeof(m_pLevels));
}
// build one. clones data from src for level 0.
FloatImagePyramid_t(FloatBitMap_t const &src, ImagePyramidMode_t mode);
// read or write a Pixel from a given level. All coordinates are specified in the same domain as the base level.
float &Pixel(int x, int y, int component, int level) const;
FloatBitMap_t *Level(int lvl) const
{
Assert(lvl<m_nLevels);
Assert(lvl<ARRAYSIZE(m_pLevels));
return m_pLevels[lvl];
}
// rebuild all levels above the specified level
void ReconstructLowerResolutionLevels(int starting_level);
~FloatImagePyramid_t(void);
void WriteTGAs(char const *basename) const; // outputs name_00.tga, name_01.tga,...
};
#endif