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////////////////////////////////////////////////////////////////////////////
// File: ShaderMan.h
// Author: Changchang Wu
// Description : interface for the ShaderMan class.
// This is a class that manages all the shaders for SIFT
//
//
// 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 _SIFT_SHADER_MAN_H
#define _SIFT_SHADER_MAN_H
#include "ProgramGPU.h"
#include "ProgramGLSL.h"
///////////////////////////////////////////////////////////////////
//class ShaderMan
//description: pure static class
// wrapper of shaders from different GPU languages
///////////////////////////////////////////////////////////////////
class SiftParam;
class FilterGLSL;
class ShaderMan
{
public:
static ShaderBag* s_bag;
public:
static void SelectInitialSmoothingFilter(int octave_min, SiftParam¶m);
static void UseShaderMarginCopy(int xmax, int ymax);
static void UseShaderOrientation(int gtex, int width, int height, float sigma, int auxtex, float step, int keypoint_list);
static void UseShaderDescriptor(int gtex, int otex, int dwidth, int fwidth, int width, int height, float sigma);
static void UseShaderSimpleOrientation(int oTex, float sigma, float sigma_step);
static void UseShaderCopyKeypoint();
static void UseShaderGenVBO( float width, float fwidth, float size);
static void UseShaderDebug();
static void UseShaderZeroPass();
static void UseShaderGenListStart(float fw, int tex0);
static void UseShaderGenListStep(int tex, int tex0);
static void UseShaderGenListEnd(int ktex);
static void UseShaderGenListHisto();
static void UseShaderGenListInit(int w, int h, int tight = 1);
static void UseShaderKeypoint(int texU, int texD);
static void UseShaderGradientPass(int texP = 0);
static void UseShaderDisplayKeypoints();
static void UseShaderDisplayGrad();
static void UseShaderRGB2Gray();
static void UseShaderDisplayDOG();
static void UseShaderDisplayGaussian();
///////////////////////////////////////////
static void FilterInitialImage(GLTexImage* tex, GLTexImage* buf);
static void FilterSampledImage(GLTexImage* tex, GLTexImage* buf);
static void FilterImage(FilterProgram* filter, GLTexImage *dst, GLTexImage *src, GLTexImage*tmp);
static void TextureCopy(GLTexImage*dst, GLTexImage*src);
static void TextureDownSample(GLTexImage* dst, GLTexImage*src, int scale = 2);
static void TextureUpSample(GLTexImage* dst, GLTexImage*src, int scale);
///////////////////////////////////////////////
static void InitShaderMan(SiftParam¶m);
static void DestroyShaders();
static int HaveShaderMan(){return s_bag != NULL;}
static void UnloadProgram();
};
#endif
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