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////////////////////////////////////////////////////////////////////////////
// File: GLTexImage.h
// Author: Changchang Wu
// Description : interface for the GLTexImage class.
// GLTexImage: naive texture class.
// sevral different quad drawing functions are provied
// GLTexPacked: packed version (four value packed as four channels of a pixel)
// GLTexInput: GLTexImage + some input information
//
// Copyright (c) 2007 University of North Carolina at Chapel Hill
// All Rights Reserved
//
// Permission to use, copy, modify and distribute this software and its
// documentation for educational, research and non-profit purposes, without
// fee, and without a written agreement is hereby granted, provided that the
// above copyright notice and the following paragraph appear in all copies.
//
// The University of North Carolina at Chapel Hill make no representations
// about the suitability of this software for any purpose. It is provided
// 'as is' without express or implied warranty.
//
// Please send BUG REPORTS to ccwu@cs.unc.edu
//
////////////////////////////////////////////////////////////////////////////
#ifndef GL_TEX_IMAGE_H
#define GL_TEX_IMAGE_H
class GlobalUtil;
class GLTexImage :public GlobalUtil
{
protected:
GLuint _texID;
int _imgWidth;
int _imgHeight;
int _texWidth;
int _texHeight;
int _drawWidth;
int _drawHeight;
public:
static void DetachFBO(int i);
static void UnbindTex();
static void UnbindMultiTex(int n);
static void DrawQuad(float x1, float x2, float y1, float y2);
public:
virtual void DrawQuadUS(int scale);
virtual void DrawQuadDS(int scale);
virtual void DrawImage();
virtual void TexConvertRGB();
virtual void ZeroHistoMargin();
virtual void SetImageSize(int width, int height);
virtual void InitTexture(int width, int height, int clamp_to_edge =1 );
void InitTexture(int width, int height, int clamp_to_edge, GLuint format);
virtual void FillMargin(int marginx, int marginy);
public:
void DrawScaledQuad(float scale);
int CopyToPBO(GLuint pbo, int width, int height, GLenum format = GL_RGBA);
void CopyFromPBO(GLuint pbo, int width, int height, GLenum format = GL_RGBA);
void FitRealTexViewPort();
void DrawQuadMT8();
void DrawQuadMT4();
void DrawQuadReduction();
void DrawQuadReduction(int w, int h);
void DrawMargin(int right, int bottom);
void DrawQuad();
void FitTexViewPort();
void ZeroHistoMargin(int hw, int hh);
int CheckTexture();
void SaveToASCII(const char* path);
public:
void AttachToFBO(int i );
void BindTex();
operator GLuint (){return _texID;}
GLuint GetTexID(){return _texID;}
int GetImgPixelCount(){return _imgWidth*_imgHeight;}
int GetTexPixelCount(){return _texWidth*_texHeight;}
int GetImgWidth(){return _imgWidth;}
int GetImgHeight(){return _imgHeight;}
int GetTexWidth(){return _texWidth;}
int GetTexHeight(){return _texHeight;}
int GetDrawWidth(){return _drawWidth;}
int GetDrawHeight(){return _drawHeight;}
//int IsTexTight(){return _texWidth == _drawWidth && _texHeight == _drawHeight;}
int IsTexPacked(){return _drawWidth != _imgWidth;}
GLTexImage();
virtual ~GLTexImage();
friend class SiftGPU;
};
//class for handle data input, to support all openGL-supported data format,
//data are first uploaded to an openGL texture then converted, and optionally
//when the datatype is simple, we downsample/convert on cpu
class GLTexInput:public GLTexImage
{
public:
int _down_sampled;
int _rgb_converted;
int _data_modified;
//////////////////////////
float * _converted_data;
const void* _pixel_data;
public:
static int IsSimpleGlFormat(unsigned int gl_format, unsigned int gl_type)
{
//the formats there is a cpu code to conver rgb and downsample
return (gl_format ==GL_LUMINANCE ||gl_format == GL_LUMINANCE_ALPHA||
gl_format == GL_RGB|| gl_format == GL_RGBA||
gl_format == GL_BGR || gl_format == GL_BGRA) &&
(gl_type == GL_UNSIGNED_BYTE || gl_type == GL_FLOAT || gl_type == GL_UNSIGNED_SHORT);
}
//in vc6, template member function doesn't work
#if !defined(_MSC_VER) || _MSC_VER > 1200
template <class Uint>
static int DownSamplePixelDataI(unsigned int gl_format, int width, int height,
int ds, const Uint * pin, Uint * pout);
template <class Uint>
static int DownSamplePixelDataI2F(unsigned int gl_format, int width, int height,
int ds, const Uint * pin, float * pout, int skip = 0);
#endif
static int DownSamplePixelDataF(unsigned int gl_format, int width, int height,
int ds, const float * pin, float * pout, int skip = 0);
static int TruncateWidthCU(int w) {return w & 0xfffffffc; }
public:
GLTexInput() : _down_sampled(0), _rgb_converted(0), _data_modified(0),
_converted_data(0), _pixel_data(0){}
int SetImageData(int width, int height, const void * data,
unsigned int gl_format, unsigned int gl_type);
int LoadImageFile(char * imagepath, int & w, int &h);
void VerifyTexture();
virtual ~GLTexInput();
};
//GLTexPacked doesn't have any data
//so that we can use the GLTexImage* pointer to index a GLTexPacked Vector
class GLTexPacked:public GLTexImage
{
public:
virtual void DrawImage();
virtual void DrawQuadUS(int scale);
virtual void DrawQuadDS(int scale);
virtual void FillMargin(int marginx, int marginy);
virtual void InitTexture(int width, int height, int clamp_to_edge =1);
virtual void TexConvertRGB();
virtual void SetImageSize(int width, int height);
virtual void ZeroHistoMargin();
//virtual void GetHistWH(int& w, int& h){return w = (3 + sz)>>1;}
public:
void DrawMargin(int right, int bottom, int mx, int my);
GLTexPacked():GLTexImage(){}
};
#endif // !defined(GL_TEX_IMAGE_H)
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