1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
#define CL_TARGET_OPENCL_VERSION 110
#include <stdlib.h>
#include <stdio.h>
#include <GL/glew.h>
#include <GL/glut.h>
#include <GL/glx.h>
#include <CL/cl_gl.h>
#include "sysfatal.h"
#define PROG_FILE "balls.cl"
#define KERNEL_FUNC "balls"
#define VERTEX_SHADER "balls.vert"
#define FRAGMENT_SHADER "balls.frag"
enum { WIDTH = 640, HEIGHT = 480 };
void initGL(int argc, char *argv[]);
void initCL(void);
void initShaders(void);
char *readFile(const char *filename, size_t *size);
void compileShader(GLint shader);
static cl_context context;
static cl_command_queue queue;
static cl_kernel kernel;
int
main(int argc, char *argv[]) {
initGL(argc, argv);
initCL();
clReleaseContext(context);
}
void
initGL(int argc, char *argv[]) {
GLenum err;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowSize(WIDTH, HEIGHT);
glutCreateWindow("Balls");
glClearColor(1, 1, 1, 1);
if ((err = glewInit()) != GLEW_OK)
sysfatal("Failed to initialize GLEW.\n");
initShaders();
}
void
initCL(void) {
cl_platform_id platform;
cl_device_id device;
cl_int err;
cl_program prog;
char *progBuf, *progLog;
size_t progSize, logSize;
/* Get platform. */
if (clGetPlatformIDs(1, &platform, NULL) < 0)
sysfatal("No OpenCL platform available.\n");
/* Configure properties for OpenGL interoperability. */
#ifdef WINDOWS
cl_context_properties properties[] = {
CL_GL_CONTEXT_KHR, (cl_context_properties) wglGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties) wctlGetCurrentDC(),
CL_CONTEXT_PLATFORM, (cl_context_properties) platform,
0
};
#else
cl_context_properties properties[] = {
CL_GL_CONTEXT_KHR, (cl_context_properties) glXGetCurrentContext(),
CL_GLX_DISPLAY_KHR, (cl_context_properties) glXGetCurrentDisplay(),
CL_CONTEXT_PLATFORM, (cl_context_properties) platform,
0
};
#endif
/* Get GPU device. */
if (clGetDeviceIDs(platform, CL_DEVICE_TYPE_GPU, 1, &device, NULL) < 0)
sysfatal("No GPUs available.\n");
/* Create context. */
context = clCreateContext(properties, 1, &device, NULL, NULL, &err);
if (err < 0)
sysfatal("Failed to create context.\n");
/* Create program from file. */
progBuf = readFile(PROG_FILE, &progSize);
prog = clCreateProgramWithSource(context, 1, (const char **) &progBuf, &progSize, &err);
if (err < 0)
sysfatal("Failed to create program.\n");
free(progBuf);
/* Build program. */
err = clBuildProgram(prog, 0, NULL, NULL, NULL, NULL);
if (err < 0) {
/* Print build log. */
clGetProgramBuildInfo(prog, device, CL_PROGRAM_BUILD_LOG, 0, NULL, &logSize);
progLog = malloc(logSize + 1);
progLog[logSize] = '\0';
clGetProgramBuildInfo(prog, device, CL_PROGRAM_BUILD_LOG, logSize+1, progLog, NULL);
fprintf(stderr, "%s\n", progLog);
free(progLog);
exit(1);
}
/* Create command queue. */
queue = clCreateCommandQueue(context, device, 0, &err);
if (err < 0)
sysfatal("Failed to create command queue.\n");
/* Create kernel. */
kernel = clCreateKernel(prog, KERNEL_FUNC, &err);
if (err < 0)
sysfatal("Failed to create kernel: %d\n", err);
}
void
initShaders(void) {
GLuint vs, fs, prog;
char *vSrc, *fSrc;
size_t vLen, fLen;
vs = glCreateShader(GL_VERTEX_SHADER);
fs = glCreateShader(GL_FRAGMENT_SHADER);
vSrc = readFile(VERTEX_SHADER, &vLen);
fSrc = readFile(FRAGMENT_SHADER, &fLen);
glShaderSource(vs, 1, (const char **) &vSrc, (GLint *) &vLen);
glShaderSource(fs, 1, (const char **) &fSrc, (GLint *) &fLen);
compileShader(vs);
compileShader(fs);
prog = glCreateProgram();
glBindAttribLocation(prog, 0, "in_coords");
glBindAttribLocation(prog, 1, "in_colors");
glAttachShader(prog, vs);
glAttachShader(prog, fs);
glLinkProgram(prog);
glUseProgram(prog);
}
char *
readFile(const char *filename, size_t *size) {
FILE *f;
char *buf;
if ((f = fopen(filename, "r")) == NULL)
sysfatal("Failed to open file '%s'\n", filename);
fseek(f, 0, SEEK_END);
*size = ftell(f);
if ((buf = malloc((*size + 1) * sizeof(char))) == NULL) {
fclose(f);
sysfatal("Failed to allocate file buffer for '%s'\n", filename);
}
rewind(f);
fread(buf, sizeof(char), *size, f);
buf[*size] = '\0';
fclose(f);
return buf;
}
void
compileShader(GLint shader) {
GLint success;
GLsizei logSize;
GLchar *log;
glCompileShader(shader);
glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
if (!success) {
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &logSize);
if ((log = malloc((logSize+1) * sizeof(GLchar))) == NULL)
sysfatal("Failed to allocate space for shader compile log.\n");
glGetShaderInfoLog(shader, logSize+1, NULL, log);
log[logSize] = '\0';
fprintf(stderr, "%s\n", log);
free(log);
exit(1);
}
}
|