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glew_head.c    176 lines (160 with data), 4.4 kB

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#include <GL/glew.h>
#if defined(_WIN32)
# include <GL/wglew.h>
#elif !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
# include <GL/glxew.h>
#endif
/*
* Define glewGetContext and related helper macros.
*/
#ifdef GLEW_MX
# define glewGetContext() ctx
# ifdef _WIN32
# define GLEW_CONTEXT_ARG_DEF_INIT GLEWContext* ctx
# define GLEW_CONTEXT_ARG_VAR_INIT ctx
# define wglewGetContext() ctx
# define WGLEW_CONTEXT_ARG_DEF_INIT WGLEWContext* ctx
# define WGLEW_CONTEXT_ARG_DEF_LIST WGLEWContext* ctx
# else /* _WIN32 */
# define GLEW_CONTEXT_ARG_DEF_INIT void
# define GLEW_CONTEXT_ARG_VAR_INIT
# define glxewGetContext() ctx
# define GLXEW_CONTEXT_ARG_DEF_INIT void
# define GLXEW_CONTEXT_ARG_DEF_LIST GLXEWContext* ctx
# endif /* _WIN32 */
# define GLEW_CONTEXT_ARG_DEF_LIST GLEWContext* ctx
#else /* GLEW_MX */
# define GLEW_CONTEXT_ARG_DEF_INIT void
# define GLEW_CONTEXT_ARG_VAR_INIT
# define GLEW_CONTEXT_ARG_DEF_LIST void
# define WGLEW_CONTEXT_ARG_DEF_INIT void
# define WGLEW_CONTEXT_ARG_DEF_LIST void
# define GLXEW_CONTEXT_ARG_DEF_INIT void
# define GLXEW_CONTEXT_ARG_DEF_LIST void
#endif /* GLEW_MX */
#if defined(__APPLE__)
#include <mach-o/dyld.h>
#include <stdlib.h>
#include <string.h>
void* NSGLGetProcAddress (const GLubyte *name)
{
NSSymbol symbol;
char* symbolName;
/* prepend a '_' for the Unix C symbol mangling convention */
symbolName = malloc(strlen((const char*)name) + 2);
strcpy(symbolName+1, (const char*)name);
symbolName[0] = '_';
symbol = NULL;
if (NSIsSymbolNameDefined(symbolName))
symbol = NSLookupAndBindSymbol(symbolName);
free(symbolName);
return symbol ? NSAddressOfSymbol(symbol) : NULL;
}
#endif /* __APPLE__ */
#if defined(__sgi) || defined (__sun)
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
void* dlGetProcAddress (const GLubyte* name)
{
static void* h = NULL;
static void* gpa;
if (h == NULL)
{
if ((h = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL)) == NULL) return NULL;
gpa = dlsym(h, "glXGetProcAddress");
}
if (gpa != NULL)
return ((void*(*)(const GLubyte*))gpa)(name);
else
return dlsym(h, (const char*)name);
}
#endif /* __sgi || __sun */
/*
* Define glewGetProcAddress.
*/
#if defined(_WIN32)
# define glewGetProcAddress(name) wglGetProcAddress((LPCSTR)name)
#else
# if defined(__APPLE__)
# define glewGetProcAddress(name) NSGLGetProcAddress(name)
# else
# if defined(__sgi) || defined(__sun)
# define glewGetProcAddress(name) dlGetProcAddress(name)
# else /* __linux */
# define glewGetProcAddress(name) (*glXGetProcAddressARB)(name)
# endif
# endif
#endif
/*
* GLEW, just like OpenGL or GLU, does not rely on the standard C library.
* These functions implement the functionality required in this file.
*/
static GLuint _glewStrLen (const GLubyte* s)
{
GLuint i=0;
while (s+i != NULL && s[i] != '\0') i++;
return i;
}
static GLuint _glewStrCLen (const GLubyte* s, GLubyte c)
{
GLuint i=0;
while (s+i != NULL && s[i] != '\0' && s[i] != c) i++;
return i;
}
static GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)
{
GLuint i=0;
while (i < n && a+i != NULL && b+i != NULL && a[i] == b[i]) i++;
return i == n ? GL_TRUE : GL_FALSE;
}
static GLboolean _glewStrSame1 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
{
while (*na > 0 && (**a == ' ' || **a == '\n' || **a == '\r' || **a == '\t'))
{
(*a)++;
(*na)--;
}
if(*na >= nb)
{
GLuint i=0;
while (i < nb && (*a)+i != NULL && b+i != NULL && (*a)[i] == b[i]) i++;
if(i == nb)
{
*a = *a + nb;
*na = *na - nb;
return GL_TRUE;
}
}
return GL_FALSE;
}
static GLboolean _glewStrSame2 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
{
if(*na >= nb)
{
GLuint i=0;
while (i < nb && (*a)+i != NULL && b+i != NULL && (*a)[i] == b[i]) i++;
if(i == nb)
{
*a = *a + nb;
*na = *na - nb;
return GL_TRUE;
}
}
return GL_FALSE;
}
static GLboolean _glewStrSame3 (GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
{
if(*na >= nb)
{
GLuint i=0;
while (i < nb && (*a)+i != NULL && b+i != NULL && (*a)[i] == b[i]) i++;
if (i == nb && (*na == nb || (*a)[i] == ' ' || (*a)[i] == '\n' || (*a)[i] == '\r' || (*a)[i] == '\t'))
{
*a = *a + nb;
*na = *na - nb;
return GL_TRUE;
}
}
return GL_FALSE;
}