1 #define GL_GLEXT_PROTOTYPES 1
12 void hsv2rgb(float h, float s, float v, float *r, float *g, float *b)
18 float hp = (h * 180.0 / M_PI) / 60.0;
19 float x = c * (1 - fabs(fmod(hp, 2.0f) - 1.0f));
21 if (hp >= 0 && hp < 1) {
25 } else if (hp >= 1 && hp < 2) {
29 } else if (hp >= 2 && hp < 3) {
33 } else if (hp >= 3 && hp < 4) {
37 } else if (hp >= 4 && hp < 5) {
53 std::string read_file(const std::string &filename)
55 static char buf[131072];
56 FILE *fp = fopen(filename.c_str(), "r");
58 perror(filename.c_str());
62 int len = fread(buf, 1, sizeof(buf), fp);
65 return std::string(buf, len);
68 GLhandleARB compile_shader(const std::string &shader_src, GLenum type)
70 GLhandleARB obj = glCreateShaderObjectARB(type);
71 const GLchar* source[] = { shader_src.data() };
72 const GLint length[] = { shader_src.size() };
73 glShaderSource(obj, 1, source, length);
76 GLchar info_log[4096];
77 GLsizei log_length = sizeof(info_log) - 1;
78 glGetShaderInfoLog(obj, log_length, &log_length, info_log);
79 info_log[log_length] = 0;
80 printf("shader compile log: %s\n", info_log);
83 glGetShaderiv(obj, GL_COMPILE_STATUS, &status);
84 if (status == GL_FALSE) {