高通平台下安卓opencl小例子

http://blog.csdn.net/wcj0626/article/details/26272019

先到高通的qdn下载adreno GPU SDK，里面有OpenCL的例子。
https://developer.qualcomm.com/software/adreno-gpu-sdk

例子在以下目录：
AdrenoSDK\Development\Samples\OpenCL

1、从高通官网下载Adreon SDK（需要注册为会员）

2、解压以后，把文件夹Development/Inc/内的CL文件夹拷贝到：Android-ndk-r9d/platforms/android-19/arch-arm/usr/include/（请自行选择拷贝到哪个版本下）

3、连接手机到电脑，在终端运行：adb pull /system/vendor/lib/libOpenCL.so,此时会把手机里的libOpenCL.so拷贝到电脑当前文件夹下，把该文件拷贝到：android-ndk-r9d/platforms/android-19/arch-arm/usr/lib/（请自行选择拷贝到哪个版本下）

4、新建安卓工程，NDK开发。不知道NDK怎么弄，请移步这里

5、Java代码：

1. public class MainActivity extends ActionBarActivity {
2. static
3. {
4. System.loadLibrary("ocl");
5. }
6. public native String  testopencl();
7. public native String getPlatformName();
8. public native String getDeviceName();
9. @Override
10. protected void onCreate(Bundle savedInstanceState) {
11. super.onCreate(savedInstanceState);
12. setContentView(R.layout.activity_main);
13. TextView testView2=(TextView)findViewById(R.id.textView2);
14. TextView testView4=(TextView)findViewById(R.id.textView4);
15. TextView testView6=(TextView)findViewById(R.id.textView6);
16. testView6.setText(testopencl());
17. testView2.setText(getPlatformName());
18. testView4.setText(getDeviceName());
19. }
20. }

6、NDK代码：ocl.cpp文件

1. #include <jni.h>
2. #include <CL/cl.h>
3. #include<malloc.h>
4. #include<stdio.h>
5. #include<stdlib.h>
6. #include"com_example_ocl_MainActivity.h"
7. #define LEN(arr) sizeof(arr) / sizeof(arr[0])
8. #define N 1024
9. #define NUM_THREAD 128
10. cl_uint num_device;
11. cl_uint num_platform;
12. cl_platform_id *platform;
13. cl_device_id *devices;
14. cl_int err;
15. cl_context context;
16. cl_command_queue cmdQueue;
17. cl_mem buffer,sum_buffer;
18. cl_program program ;
19. cl_kernel kernel;
20. const char* src[] = {
21. "  __kernel void redution(  \n"
22. "  __global int *data,     \n"
23. "  __global int *output,   \n"
24. "  __local int *data_local   \n"
25. "  )  \n"
26. " {   \n"
27. "  int gid=get_group_id(0);   \n"
28. "  int tid=get_global_id(0);    \n"
29. "  int size=get_local_size(0);   \n"
30. "  int id=get_local_id(0);     \n"
31. "  data_local[id]=data[tid];   \n"
32. "  barrier(CLK_LOCAL_MEM_FENCE);   \n"
33. "  for(int i=size/2;i>0;i>>=1){    \n"
34. "      if(id<i){   \n"
35. "          data_local[id]+=data_local[id+i];   \n"
36. "      }   \n"
37. "      barrier(CLK_LOCAL_MEM_FENCE);   \n"
38. "  }    \n"
39. "  if(id==0){    \n"
40. "      output[gid]=data_local[0];   \n"
41. "  }    \n"
42. " }   \n"
43. };
44. int num_block;
45. int  test()
46. {
47. int* in,*out;
48. num_block=N/NUM_THREAD;
49. in=(int*)malloc(sizeof(int)*N);
50. out=(int*)malloc(sizeof(int)*num_block);
51. for(int i=0;i<N;i++){
52. in[i]=1;
53. }
54. Init_OpenCL();
55. Context_cmd();
56. Create_Buffer(in);
57. Create_program();
58. Set_arg();
59. Execution();
60. CopyOutResult(out);
61. int sum=0;
62. for(int i=0;i<num_block;i++){
63. sum+=out[i];
64. }
65. return sum;
66. }
67. JNIEXPORT jstring JNICALL Java_com_example_ocl_MainActivity_testopencl (JNIEnv * env, jobject thisobject)
68. {
69. char result[10];
70. sprintf(result,"%d\n",test());
71. return env->NewStringUTF(result);
72. }
73. JNIEXPORT jstring JNICALL Java_com_example_ocl_MainActivity_getPlatformName(JNIEnv *env , jobject thisobject)
74. {
75. char buffer[1024];
76. clGetPlatformInfo(platform[0],CL_PLATFORM_NAME,sizeof(buffer),buffer,NULL);
77. return env->NewStringUTF(buffer);
78. }
79. JNIEXPORT jstring JNICALL Java_com_example_ocl_MainActivity_getDeviceName(JNIEnv *env , jobject thisobject)
80. {
81. char buffer[1024];
82. clGetDeviceInfo(devices[0],CL_DEVICE_NAME,sizeof(buffer),buffer,NULL);
83. return env->NewStringUTF(buffer);
84. }
85. void Init_OpenCL()
86. {
87. size_t nameLen1;
88. char platformName[1024];
89. err = clGetPlatformIDs(0, 0, &num_platform);
90. platform=(cl_platform_id*)malloc(sizeof(cl_platform_id)*num_platform);
91. err = clGetPlatformIDs(num_platform, platform, NULL);
92. err=clGetDeviceIDs(platform[0],CL_DEVICE_TYPE_GPU,0,NULL,&num_device);
93. devices=(cl_device_id*)malloc(sizeof(cl_device_id)*num_device);
94. err=clGetDeviceIDs(platform[0],CL_DEVICE_TYPE_GPU,num_device,devices,NULL);
95. }
96. void Context_cmd()
97. {
98. context=clCreateContext(NULL,num_device,devices,NULL,NULL,&err);
99. cmdQueue=clCreateCommandQueue(context,devices[0],0,&err);
100. }
101. void Create_Buffer(int *data)
102. {
103. buffer=clCreateBuffer(context,CL_MEM_READ_ONLY|CL_MEM_COPY_HOST_PTR,sizeof(int)*N,data,&err);
104. sum_buffer=clCreateBuffer(context,CL_MEM_WRITE_ONLY,sizeof(int)*num_block,0,&err);
105. }
106. void Create_program()
107. {
108. program=clCreateProgramWithSource(context, LEN(src), src, NULL, NULL);
109. err=clBuildProgram(program,num_device,devices,NULL,NULL,NULL);
110. kernel = clCreateKernel(program, "redution", NULL);
111. }
112. void Set_arg()
113. {
114. err=clSetKernelArg(kernel,0,sizeof(cl_mem),&buffer);
115. err=clSetKernelArg(kernel,1,sizeof(cl_mem),&sum_buffer);
116. err=clSetKernelArg(kernel,2,sizeof(int)*NUM_THREAD,NULL);
117. }
118. void Execution()
119. {
120. const size_t globalWorkSize[1]={N};
121. const size_t localWorkSize[1]={NUM_THREAD};
122. err=clEnqueueNDRangeKernel(cmdQueue,kernel,1,NULL,globalWorkSize,localWorkSize,0,NULL,NULL);
123. clFinish(cmdQueue);
124. }
125. void CopyOutResult(int*out)
126. {
127. err=clEnqueueReadBuffer(cmdQueue,sum_buffer,CL_TRUE,0,sizeof(int)*num_block,out,0,NULL,NULL);
128. }

7、Android.mk代码：

1. LOCAL_PATH := $(call my-dir)
2. include $(CLEAR_VARS)
3. LOCAL_MODULE    := ocl
4. LOCAL_SRC_FILES := ocl.cpp
5. LOCAL_LDFLAGS += -llog  -lOpenCL
6. include $(BUILD_SHARED_LIBRARY)

8、执行结果：

搞定！！！