static GLenum GLEWAPIENTRY glewContextInit ()
{
PFNGLGETSTRINGPROC getString;
const GLubyte* s;
GLuint dot;
GLint major, minor;
/* query opengl version */
getString = (PFNGLGETSTRINGPROC) glewGetProcAddress((const GLubyte*)"glGetString");
if (!getString)
return GLEW_ERROR_NO_GL_VERSION;
s = getString(GL_VERSION);
dot = _glewStrCLen(s, '.');
if (dot == 0)
return GLEW_ERROR_NO_GL_VERSION;
major = s[dot-1]-'0';
minor = s[dot+1]-'0';
if (minor < 0 || minor > 9)
minor = 0;
if (major<0 || major>9)
return GLEW_ERROR_NO_GL_VERSION;
if (major == 1 && minor == 0)
{
return GLEW_ERROR_GL_VERSION_10_ONLY;
}
else
{
GLEW_VERSION_4_5 = ( major > 4 ) || ( major == 4 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_4 = GLEW_VERSION_4_5 == GL_TRUE || ( major == 4 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_3 = GLEW_VERSION_4_4 == GL_TRUE || ( major == 4 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_2 = GLEW_VERSION_4_3 == GL_TRUE || ( major == 4 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_1 = GLEW_VERSION_4_2 == GL_TRUE || ( major == 4 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_0 = GLEW_VERSION_4_1 == GL_TRUE || ( major == 4 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_3 = GLEW_VERSION_4_0 == GL_TRUE || ( major == 3 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_2 = GLEW_VERSION_3_3 == GL_TRUE || ( major == 3 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_1 = GLEW_VERSION_3_2 == GL_TRUE || ( major == 3 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_0 = GLEW_VERSION_3_1 == GL_TRUE || ( major == 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_2_1 = GLEW_VERSION_3_0 == GL_TRUE || ( major == 2 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_2_0 = GLEW_VERSION_2_1 == GL_TRUE || ( major == 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_5 = GLEW_VERSION_2_0 == GL_TRUE || ( major == 1 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_4 = GLEW_VERSION_1_5 == GL_TRUE || ( major == 1 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_3 = GLEW_VERSION_1_4 == GL_TRUE || ( major == 1 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_2_1 = GLEW_VERSION_1_3 == GL_TRUE ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_2 = GLEW_VERSION_1_2_1 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_1 = GLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
}
memset(_glewExtensionString,0,sizeof(_glewExtensionString));
if (GLEW_VERSION_3_0)
{
GLint n = 0;
GLint i;
PFNGLGETINTEGERVPROC getIntegerv;
PFNGLGETSTRINGIPROC getStringi;
const char *ext;
GLboolean *enable;
getIntegerv = (PFNGLGETINTEGERVPROC) glewGetProcAddress((const GLubyte*)"glGetIntegerv");
if (getIntegerv)
getIntegerv(GL_NUM_EXTENSIONS, &n);
/* glGetStringi is OpenGL 3.0 */
getStringi = (PFNGLGETSTRINGIPROC) glewGetProcAddress((const GLubyte*)"glGetStringi");
if (getStringi)
for (i = 0; i<n; ++i)
{
ext = (const char *) getStringi(GL_EXTENSIONS, i);
/* Based on extension string(s), glewGetExtension purposes */
enable = _glewGetExtensionString(ext);
if (enable)
*enable = GL_TRUE;
/* Based on extension string(s), experimental mode, glewIsSupported purposes */
enable = _glewGetExtensionEnable(ext);
if (enable)
*enable = GL_TRUE;
}
}
else
{
const char *extensions;
const char *end;
const char *i;
const char *j;
char ext[128];
GLboolean *enable;
extensions = (const char *) getString(GL_EXTENSIONS);
if (extensions)
{
end = extensions + _glewStrLen((const GLubyte *) extensions);
for (i=extensions; i<end; i = j + 1)
{
i = _glewNextNonSpace(i);
j = _glewNextSpace(i);
/* Copy extension into NUL terminated string */
if (j-i >= (ptrdiff_t) sizeof(ext))
continue;
_glewStrCopy(ext, i, ' ');
/* Based on extension string(s), glewGetExtension purposes */
enable = _glewGetExtensionString(ext);
if (enable)
*enable = GL_TRUE;
/* Based on extension string(s), experimental mode, glewIsSupported purposes */
enable = _glewGetExtensionEnable(ext);
if (enable)
*enable = GL_TRUE;
}
}
}
static GLenum GLEWAPIENTRY glewContextInit ()
{
const GLubyte* s;
GLuint dot;
GLint major, minor;
/* query opengl version */
s = glGetString(GL_VERSION);
dot = _glewStrCLen(s, '.');
if (dot == 0)
return GLEW_ERROR_NO_GL_VERSION;
major = s[dot-1]-'0';
minor = s[dot+1]-'0';
if (minor < 0 || minor > 9)
minor = 0;
if (major<0 || major>9)
return GLEW_ERROR_NO_GL_VERSION;
if (major == 1 && minor == 0)
{
return GLEW_ERROR_GL_VERSION_10_ONLY;
}
else
{
GLEW_VERSION_4_5 = ( major > 4 ) || ( major == 4 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_4 = GLEW_VERSION_4_5 == GL_TRUE || ( major == 4 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_3 = GLEW_VERSION_4_4 == GL_TRUE || ( major == 4 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_2 = GLEW_VERSION_4_3 == GL_TRUE || ( major == 4 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_1 = GLEW_VERSION_4_2 == GL_TRUE || ( major == 4 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_4_0 = GLEW_VERSION_4_1 == GL_TRUE || ( major == 4 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_3 = GLEW_VERSION_4_0 == GL_TRUE || ( major == 3 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_2 = GLEW_VERSION_3_3 == GL_TRUE || ( major == 3 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_1 = GLEW_VERSION_3_2 == GL_TRUE || ( major == 3 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_3_0 = GLEW_VERSION_3_1 == GL_TRUE || ( major == 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_2_1 = GLEW_VERSION_3_0 == GL_TRUE || ( major == 2 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_2_0 = GLEW_VERSION_2_1 == GL_TRUE || ( major == 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_5 = GLEW_VERSION_2_0 == GL_TRUE || ( major == 1 && minor >= 5 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_4 = GLEW_VERSION_1_5 == GL_TRUE || ( major == 1 && minor >= 4 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_3 = GLEW_VERSION_1_4 == GL_TRUE || ( major == 1 && minor >= 3 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_2_1 = GLEW_VERSION_1_3 == GL_TRUE ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_2 = GLEW_VERSION_1_2_1 == GL_TRUE || ( major == 1 && minor >= 2 ) ? GL_TRUE : GL_FALSE;
GLEW_VERSION_1_1 = GLEW_VERSION_1_2 == GL_TRUE || ( major == 1 && minor >= 1 ) ? GL_TRUE : GL_FALSE;
}
memset(_glewExtensionString,0,sizeof(_glewExtensionString));
if (GLEW_VERSION_3_0)
{
GLint n = 0;
GLint i;
PFNGLGETSTRINGIPROC getStringi;
const char *ext;
GLboolean *enable;
glGetIntegerv(GL_NUM_EXTENSIONS, &n);
/* glGetStringi is OpenGL 3.0 */
getStringi = (PFNGLGETSTRINGIPROC) glewGetProcAddress((const GLubyte*)"glGetStringi");
if (getStringi)
for (i = 0; i<n; ++i)
{
ext = (const char *) getStringi(GL_EXTENSIONS, i);
/* Based on extension string(s), glewGetExtension purposes */
enable = _glewGetExtensionString(ext);
if (enable)
*enable = GL_TRUE;
/* Based on extension string(s), experimental mode, glewIsSupported purposes */
enable = _glewGetExtensionEnable(ext);
if (enable)
*enable = GL_TRUE;
}
}
else
{
const GLubyte *ext;
char *begin;
char *end;
char *i;
char *j;
GLboolean *enable;
ext = glGetString(GL_EXTENSIONS);
if (ext)
{
begin = (char *) _glewStrDup(ext);
end = begin + _glewStrLen((GLubyte *) begin);
for (i=begin; i<end; i = j + 1)
{
i = _glewNextNonSpace(i);
j = _glewNextSpace(i);
*j = 0;
/* Based on extension string(s), glewGetExtension purposes */
enable = _glewGetExtensionString(i);
if (enable)
*enable = GL_TRUE;
/* Based on extension string(s), experimental mode, glewIsSupported purposes */
enable = _glewGetExtensionEnable(i);
if (enable)
*enable = GL_TRUE;
}
free(begin);
}
}
