mirror of
https://github.com/nillerusr/source-engine.git
synced 2024-12-22 22:27:05 +00:00
364 lines
9.9 KiB
C
364 lines
9.9 KiB
C
|
//========= 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
|