在C++ class 中使用CUDA(包含texutre 2d的使用)

一直想写一下global内存访问的文章,但是最近的事情太多,哎昨天。。。,今天的一篇paper也被拒了~~哎--
不过收到一个朋友( from this AVerMedia TECHNOLOGIES(Suzhou), Inc. )求助邮,看得出来项目比较棘手,应该是对CUDA的使用有些不清楚;
晚上熬夜写了一个简单的C++ class 封装CUDA的demo,里面涉及到了texture的使用,希望对他的CUDA学习有帮助:
下面是三部分的代码
1. 调用class的sample.cu 文件这里没多少好解释的,就是直接生产一个cuda的class实例,然后调用各个方法
  1. /********************************************************************
  2. * sample.cu
  3. *ThisisaexampleoftheCUDAprogram.
  4. *author:zhao.kaiyong(at)gmail.com
  5. *http://www.comp.hkbu.edu.hk/~kyzhao/
  6. *********************************************************************/
  7. #include<stdio.h>
  8. #include<stdlib.h>
  9. #include<cuda_runtime.h>
  10. #include<cutil.h>
  11. #include"cuda_class.h"
  12. /************************************************************************/
  13. /*HelloCUDA*/
  14. /************************************************************************/
  15. intmain(intargc,char*argv[])
  16. {
  17. cuda_classcudaA;
  18. if(!cudaA.InitCUDA()){
  19. return0;
  20. }
  21. floathost_data[22]={0};
  22. floathost_result[11]={0};
  23. for(inti=0;i<22;i++)
  24. {
  25. host_data[i]=i;
  26. }
  27. cudaA.InitTexture(host_data,11,2);
  28. cudaA.MallocMemA(11);
  29. unsignedinttimer=0;
  30. CUT_SAFE_CALL(cutCreateTimer(&timer));
  31. CUT_SAFE_CALL(cutStartTimer(timer));
  32. cudaA.DoWork();
  33. CUDA_SAFE_CALL(cudaThreadSynchronize());
  34. CUT_SAFE_CALL(cutStopTimer(timer));
  35. printf("Processingtime:%f(ms)/n",cutGetTimerValue(timer));
  36. CUT_SAFE_CALL(cutDeleteTimer(timer));
  37. cudaA.TranslateResult(host_result);
  38. cudaA.ReleaseMem();
  39. for(inti=0;i<11;i++)
  40. {
  41. printf("%f/n",host_result[i]);
  42. }
  43. CUT_EXIT(argc,argv);
  44. return0;
  45. }

2. 两个class 文件
  1. /********************************************************************
  2. *cuda_class.h
  3. *ThisisaexampleoftheCUDAprogram.
  4. *author:zhao.kaiyong(at)gmail.com
  5. *http://www.comp.hkbu.edu.hk/~kyzhao/
  6. *********************************************************************/
  7. #ifndef__CUDA_CLASS_H__
  8. #define__CUDA_CLASS_H__
  9. #include<cutil.h>
  10. classcuda_class
  11. {
  12. public:
  13. cuda_class(void);
  14. ~cuda_class(void);
  15. intInitCUDA();
  16. intMallocMemA(intlen);
  17. intInitTexture(float*init_data,intw,inth);
  18. intDoWork();
  19. intTranslateResult(float*out_data);
  20. intReleaseMem();
  21. intReleaseTex();
  22. private:
  23. float*device_result;
  24. cudaArray*device_tex;
  25. intm_ret_len;
  26. };
  27. #endif//__CUDA_CLASS_H__
  1. /********************************************************************
  2. *cuda_class.cu
  3. *ThisisaexampleoftheCUDAprogram.
  4. *author:zhao.kaiyong(at)gmail.com
  5. *http://www.comp.hkbu.edu.hk/~kyzhao/
  6. *********************************************************************/
  7. #include"cuda_class.h"
  8. #include<stdio.h>
  9. #include<stdlib.h>
  10. #include<cuda_runtime.h>
  11. #include<cutil.h>
  12. texture<float,2,cudaReadModeElementType>tex;
  13. /************************************************************************/
  14. /*Example*/
  15. /************************************************************************/
  16. __global__staticvoidHelloCUDA(float*result,intnum)
  17. {
  18. inti=0;
  19. for(i=0;i<num;i++){
  20. result[i]=tex2D(tex,(float)i,0)+tex2D(tex,(float)i,1);
  21. }
  22. }
  23. cuda_class::cuda_class(void)
  24. {
  25. }
  26. cuda_class::~cuda_class(void)
  27. {
  28. }
  29. intcuda_class::InitCUDA()
  30. {
  31. /************************************************************************/
  32. /*InitCUDA*/
  33. /************************************************************************/
  34. #if__DEVICE_EMULATION__
  35. returntrue;
  36. #else
  37. intcount=0;
  38. inti=0;
  39. cudaGetDeviceCount(&count);
  40. if(count==0){
  41. fprintf(stderr,"Thereisnodevice./n");
  42. returnfalse;
  43. }
  44. for(i=0;i<count;i++){
  45. cudaDevicePropprop;
  46. if(cudaGetDeviceProperties(∝,i)==cudaSuccess){
  47. if(prop.major>=1){
  48. break;
  49. }
  50. }
  51. }
  52. if(i==count){
  53. fprintf(stderr,"ThereisnodevicesupportingCUDA./n");
  54. returnfalse;
  55. }
  56. cudaSetDevice(i);
  57. printf("CUDAinitialized./n");
  58. returntrue;
  59. #endif
  60. }
  61. intcuda_class::MallocMemA(intlen)
  62. {
  63. m_ret_len=len;
  64. CUDA_SAFE_CALL(cudaMalloc((void**)&device_result,sizeof(float)*m_ret_len));
  65. return1;
  66. }
  67. intcuda_class::DoWork()
  68. {
  69. HelloCUDA<<<1,1,0>>>(device_result,m_ret_len);
  70. CUT_CHECK_ERROR("Kernelexecutionfailed/n");
  71. return1;
  72. }
  73. intcuda_class::TranslateResult(float*out_data)
  74. {
  75. CUDA_SAFE_CALL(cudaMemcpy(out_data,device_result,sizeof(float)*m_ret_len,cudaMemcpyDeviceToHost));
  76. return1;
  77. }
  78. intcuda_class::ReleaseMem()
  79. {
  80. CUDA_SAFE_CALL(cudaFree(device_result));
  81. CUDA_SAFE_CALL(cudaFreeArray(device_tex));
  82. CUDA_SAFE_CALL(cudaUnbindTexture(tex));
  83. return1;
  84. }
  85. intcuda_class::InitTexture(float*init_data,intw,inth)
  86. {
  87. cudaChannelFormatDescchannelDesc=cudaCreateChannelDesc<float>();
  88. CUDA_SAFE_CALL(cudaMallocArray(&device_tex,&channelDesc,w,h));
  89. CUDA_SAFE_CALL(cudaMemcpyToArray(device_tex,0,0,init_data,sizeof(float)*w*h,cudaMemcpyHostToDevice));
  90. CUDA_SAFE_CALL(cudaBindTextureToArray(tex,device_tex,channelDesc));
  91. return1;
  92. }
这里需要做个解释,现在CUDA的cu文件是可以直接按照c++方式编译的,这个得在nvcc的编译选项里面可以设定为--host-compilation C++,在默认的情况下,以前2.0版本以前都是按照C格式编译文件,现在都是会按照C++方式编译文件,所以这里可以直接用cu文件来写Class。

在编译的时候,需要加上/MTd(debug), /MT(Release)版本,这里是告诉xcompiler选项,支持C++的runtime库,不然会有一些lib 访问冲突。

下面是下载整个工程的下载连接:不过release版本编译选项没设置,这就留给大家自己熟悉环境吧~~不要问我怎么设置……
http://download.csdn.net/user/OpenHero
cuda_cpp_class_texture_demo.rar

应该对C++和texture比较迷茫的朋友有一些帮忙.


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