mirror of
https://github.com/nigels-com/glew.git
synced 2024-11-24 23:05:06 +00:00
c9a40e3cee
git-svn-id: https://glew.svn.sourceforge.net/svnroot/glew/trunk/glew@498 783a27ee-832a-0410-bc00-9f386506c6dd
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/* ------------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Search for name in the extensions string. Use of strstr()
|
|
* is not sufficient because extension names can be prefixes of
|
|
* other extension names. Could use strtok() but the constant
|
|
* string returned by glGetString might be in read-only memory.
|
|
*/
|
|
GLboolean glewGetExtension (const char* name)
|
|
{
|
|
GLubyte* p;
|
|
GLubyte* end;
|
|
GLuint len = _glewStrLen((const GLubyte*)name);
|
|
p = (GLubyte*)glGetString(GL_EXTENSIONS);
|
|
if (0 == p) return GL_FALSE;
|
|
end = p + _glewStrLen(p);
|
|
while (p < end)
|
|
{
|
|
GLuint n = _glewStrCLen(p, ' ');
|
|
if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
|
|
p += n+1;
|
|
}
|
|
return GL_FALSE;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
#ifndef GLEW_MX
|
|
static
|
|
#endif
|
|
GLenum glewContextInit (GLEW_CONTEXT_ARG_DEF_LIST)
|
|
{
|
|
const GLubyte* s;
|
|
GLuint dot, major, minor;
|
|
/* query opengl version */
|
|
s = glGetString(GL_VERSION);
|
|
dot = _glewStrCLen(s, '.');
|
|
major = dot-1;
|
|
minor = dot+1;
|
|
if (dot == 0 || s[minor] == '\0')
|
|
return GLEW_ERROR_NO_GL_VERSION;
|
|
if (s[major] == '1' && s[minor] == '0')
|
|
{
|
|
return GLEW_ERROR_GL_VERSION_10_ONLY;
|
|
}
|
|
else
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_1) = GL_TRUE;
|
|
if (s[major] >= '2')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_4) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_5) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_2_0) = GL_TRUE;
|
|
if (s[minor] >= '1')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_2_1) = GL_TRUE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (s[minor] >= '5')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_4) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_5) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
|
|
}
|
|
if (s[minor] == '4')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_4) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
|
|
}
|
|
if (s[minor] == '3')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_3) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_4) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
|
|
}
|
|
if (s[minor] == '2')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_2) = GL_TRUE;
|
|
CONST_CAST(GLEW_VERSION_1_3) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_1_4) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
|
|
}
|
|
if (s[minor] < '2')
|
|
{
|
|
CONST_CAST(GLEW_VERSION_1_2) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_1_3) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_1_4) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_1_5) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_0) = GL_FALSE;
|
|
CONST_CAST(GLEW_VERSION_2_1) = GL_FALSE;
|
|
}
|
|
}
|
|
}
|
|
/* initialize extensions */
|