CuTexImage.cpp

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//      File:           CuTexImage.cpp
//      Author:         Changchang Wu
//      Description : implementation of the CuTexImage class.
//
//      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
//

#if defined(CUDA_SIFTGPU_ENABLED)

#include "GL/glew.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <stdlib.h>
#include <math.h>
using namespace std;

#include <cuda.h>
#include <cuda_runtime_api.h>
#include <cuda_gl_interop.h>

#include "GlobalUtil.h"
#include "GLTexImage.h"
#include "CuTexImage.h" 
#include "ProgramCU.h"

#if CUDA_VERSION <= 2010 && defined(SIFTGPU_ENABLE_LINEAR_TEX2D) 
#error "Require CUDA 2.2 or higher"
#endif


CuTexImage::CuTexImage()
{
        _cuData = NULL;
        _cuData2D = NULL;
        _fromPBO = 0;
        _numChannel = _numBytes = 0;
        _imgWidth = _imgHeight = _texWidth = _texHeight = 0;
}

CuTexImage::CuTexImage(int width, int height, int nchannel, GLuint pbo)
{
        _cuData = NULL;

        //check size of pbo
        GLint bsize, esize = width * height * nchannel * sizeof(float);
        glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo);
        glGetBufferParameteriv(GL_PIXEL_PACK_BUFFER_ARB, GL_BUFFER_SIZE, &bsize);
        if(bsize < esize)
        {
                glBufferData(GL_PIXEL_PACK_BUFFER_ARB, esize,   NULL, GL_STATIC_DRAW_ARB);
                glGetBufferParameteriv(GL_PIXEL_PACK_BUFFER_ARB, GL_BUFFER_SIZE, &bsize);
        }
        glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 0);
        if(bsize >=esize)
        {

                cudaGLRegisterBufferObject(pbo);
                cudaGLMapBufferObject(&_cuData, pbo);
                ProgramCU::CheckErrorCUDA("cudaGLMapBufferObject");
                _fromPBO = pbo;
        }else
        {
                _cuData = NULL;
                _fromPBO = 0;
        }
        if(_cuData)
        {
                _numBytes = bsize;
                _imgWidth = width;
                _imgHeight = height;
                _numChannel = nchannel;
        }else
        {
                _numBytes = 0;
                _imgWidth = 0;
                _imgHeight = 0;
                _numChannel = 0;
        }

        _texWidth = _texHeight =0;

        _cuData2D = NULL;
}

CuTexImage::~CuTexImage()
{
        

        if(_fromPBO)
        {
                cudaGLUnmapBufferObject(_fromPBO);
                cudaGLUnregisterBufferObject(_fromPBO);
        }else if(_cuData) 
        {
                cudaFree(_cuData);
        }
        if(_cuData2D)  cudaFreeArray(_cuData2D);
}

void CuTexImage::SetImageSize(int width, int height)
{
        _imgWidth = width;
        _imgHeight = height;
}

void CuTexImage::InitTexture(int width, int height, int nchannel)
{
        int size; 
        _imgWidth = width;
        _imgHeight = height;
        _numChannel = min(max(nchannel, 1), 4);

        size = width * height * _numChannel * sizeof(float);

        if(size <= _numBytes) return;
        
        if(_cuData) cudaFree(_cuData);
        
        //allocate the array data
        cudaMalloc(&_cuData, _numBytes = size);

#ifdef _DEBUG
        ProgramCU::CheckErrorCUDA("CuTexImage::InitTexture");
#endif
}

void CuTexImage::CopyFromHost(const void * buf)
{
        if(_cuData == NULL) return;
        cudaMemcpy( _cuData, buf, _imgWidth * _imgHeight * _numChannel * sizeof(float), cudaMemcpyHostToDevice);
}

void CuTexImage::CopyToHost(void * buf)
{
        if(_cuData == NULL) return;
        cudaMemcpy(buf, _cuData, _imgWidth * _imgHeight * _numChannel * sizeof(float), cudaMemcpyDeviceToHost);
}

void CuTexImage::CopyToHost(void * buf, int stream)
{
        if(_cuData == NULL) return;
        cudaMemcpyAsync(buf, _cuData, _imgWidth * _imgHeight * _numChannel * sizeof(float), cudaMemcpyDeviceToHost, (cudaStream_t)stream);
}

void CuTexImage::InitTexture2D()
{
#if !defined(SIFTGPU_ENABLE_LINEAR_TEX2D) 
        if(_cuData2D && (_texWidth < _imgWidth || _texHeight < _imgHeight))
        {
                cudaFreeArray(_cuData2D); 
                _cuData2D = NULL;
        }

        if(_cuData2D == NULL)
        {
                _texWidth = max(_texWidth, _imgWidth);
                _texHeight = max(_texHeight, _imgHeight);
                cudaChannelFormatDesc desc;
                desc.f = cudaChannelFormatKindFloat;
                desc.x = sizeof(float) * 8;
                desc.y = _numChannel >=2 ? sizeof(float) * 8 : 0;
                desc.z = _numChannel >=3 ? sizeof(float) * 8 : 0;
                desc.w = _numChannel >=4 ? sizeof(float) * 8 : 0;
                cudaMallocArray(&_cuData2D, &desc, _texWidth, _texHeight); 
                ProgramCU::CheckErrorCUDA("cudaMallocArray");
        }
#endif
}

void CuTexImage::CopyToTexture2D()
{
#if !defined(SIFTGPU_ENABLE_LINEAR_TEX2D) 
        InitTexture2D();

        if(_cuData2D)
        {
                cudaMemcpy2DToArray(_cuData2D, 0, 0, _cuData, _imgWidth* _numChannel* sizeof(float) , 
                _imgWidth * _numChannel*sizeof(float), _imgHeight,      cudaMemcpyDeviceToDevice); 
                ProgramCU::CheckErrorCUDA("cudaMemcpy2DToArray");
        }
#endif

}

int CuTexImage::DebugCopyToTexture2D()
{

/*      CuTexImage tex;
        float data1[2][3] = {{1, 2, 5}, {3, 4, 5}}, data2[2][5];
        tex.InitTexture(3, 2, 1);
        cudaMemcpy(tex._cuData, data1[0], 6 * sizeof(float), cudaMemcpyHostToDevice);
        cudaMemcpy(data1, tex._cuData, 4 * sizeof(float) , cudaMemcpyDeviceToHost);
        tex._texWidth =5;  tex._texHeight = 2;
        tex.CopyToTexture2D();
        cudaMemcpyFromArray(data2[0], tex._cuData2D, 0, 0, 10 * sizeof(float), cudaMemcpyDeviceToHost);*/
        
        return 1;
}



void CuTexImage::CopyFromPBO(int width, int height, GLuint pbo)
{
        void* pbuf =NULL;
        GLint esize = width * height * sizeof(float);
        cudaGLRegisterBufferObject(pbo);
        cudaGLMapBufferObject(&pbuf, pbo);

        cudaMemcpy(_cuData, pbuf, esize, cudaMemcpyDeviceToDevice);

        cudaGLUnmapBufferObject(pbo);
        cudaGLUnregisterBufferObject(pbo);
}

int CuTexImage::CopyToPBO(GLuint pbo)
{
        void* pbuf =NULL;
        GLint bsize, esize = _imgWidth * _imgHeight * sizeof(float) * _numChannel;
        glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, pbo);
        glGetBufferParameteriv(GL_PIXEL_PACK_BUFFER_ARB, GL_BUFFER_SIZE, &bsize);
        if(bsize < esize) 
        {
                glBufferData(GL_PIXEL_PACK_BUFFER_ARB, esize*3/2,       NULL, GL_STATIC_DRAW_ARB);
                glGetBufferParameteriv(GL_PIXEL_PACK_BUFFER_ARB, GL_BUFFER_SIZE, &bsize);
        }
        glBindBuffer(GL_PIXEL_PACK_BUFFER_ARB, 0);

        if(bsize >= esize)
        {
                cudaGLRegisterBufferObject(pbo);
                cudaGLMapBufferObject(&pbuf, pbo);
                cudaMemcpy(pbuf, _cuData, esize, cudaMemcpyDeviceToDevice);
                cudaGLUnmapBufferObject(pbo);
                cudaGLUnregisterBufferObject(pbo);
                return 1;
        }else
        {
                return 0;
        }
}

#endif