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#include <GL/glew.h>
#if defined(_WIN32)
# include <GL/wglew.h>
#elif !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && (!defined(__APPLE__) || defined(GLEW_APPLE_GLX))
# include <GL/glxew.h>
#endif
#include <stddef.h> /* For size_t */
/*
* 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(GLEW_REGAL)
/* In GLEW_REGAL mode we call direcly into the linked
libRegal.so glGetProcAddressREGAL for looking up
the GL function pointers. */
# undef glGetProcAddressREGAL
# ifdef WIN32
extern void * __stdcall glGetProcAddressREGAL(const GLchar *name);
static void * (__stdcall * regalGetProcAddress) (const GLchar *) = glGetProcAddressREGAL;
# else
extern void * glGetProcAddressREGAL(const GLchar *name);
static void * (*regalGetProcAddress) (const GLchar *) = glGetProcAddressREGAL;
# endif
# define glGetProcAddressREGAL GLEW_GET_FUN(__glewGetProcAddressREGAL)
#elif defined(__sgi) || defined (__sun) || defined(__HAIKU__) || defined(GLEW_APPLE_GLX)
#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 || GLEW_APPLE_GLX */
#if defined(__APPLE__)
#include <stdlib.h>
#include <string.h>
#include <AvailabilityMacros.h>
#ifdef MAC_OS_X_VERSION_10_3
#include <dlfcn.h>
void* NSGLGetProcAddress (const GLubyte *name)
{
static void* image = NULL;
void* addr;
if (NULL == image)
{
image = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY);
}
if( !image ) return NULL;
addr = dlsym(image, (const char*)name);
if( addr ) return addr;
#ifdef GLEW_APPLE_GLX
return dlGetProcAddress( name ); // try next for glx symbols
#else
return NULL;
#endif
}
#else
#include <mach-o/dyld.h>
void* NSGLGetProcAddress (const GLubyte *name)
{
static const struct mach_header* image = NULL;
NSSymbol symbol;
char* symbolName;
if (NULL == image)
{
image = NSAddImage("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", NSADDIMAGE_OPTION_RETURN_ON_ERROR);
}
/* 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); */
symbol = image ? NSLookupSymbolInImage(image, symbolName, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR) : NULL;
free(symbolName);
if( symbol ) return NSAddressOfSymbol(symbol);
#ifdef GLEW_APPLE_GLX
return dlGetProcAddress( name ); // try next for glx symbols
#else
return NULL;
#endif
}
#endif /* MAC_OS_X_VERSION_10_3 */
#endif /* __APPLE__ */
/*
* Define glewGetProcAddress.
*/
#if defined(GLEW_REGAL)
# define glewGetProcAddress(name) regalGetProcAddress((const GLchar *) name)
#elif defined(_WIN32)
# define glewGetProcAddress(name) wglGetProcAddress((LPCSTR)name)
#elif defined(__APPLE__) && !defined(GLEW_APPLE_GLX)
# define glewGetProcAddress(name) NSGLGetProcAddress(name)
#elif defined(__sgi) || defined(__sun) || defined(__HAIKU__)
# define glewGetProcAddress(name) dlGetProcAddress(name)
#elif defined(__ANDROID__)
# define glewGetProcAddress(name) NULL /* TODO */
#elif defined(__native_client__)
# define glewGetProcAddress(name) NULL /* TODO */
#else /* __linux */
# define glewGetProcAddress(name) (*glXGetProcAddressARB)(name)
#endif
/*
* Redefine GLEW_GET_VAR etc without const cast
*/
#undef GLEW_GET_VAR
#ifdef GLEW_MX
# define GLEW_GET_VAR(x) (glewGetContext()->x)
#else /* GLEW_MX */
# define GLEW_GET_VAR(x) (x)
#endif /* GLEW_MX */
#ifdef WGLEW_GET_VAR
# undef WGLEW_GET_VAR
# ifdef GLEW_MX
# define WGLEW_GET_VAR(x) (wglewGetContext()->x)
# else /* GLEW_MX */
# define WGLEW_GET_VAR(x) (x)
# endif /* GLEW_MX */
#endif /* WGLEW_GET_VAR */
#ifdef GLXEW_GET_VAR
# undef GLXEW_GET_VAR
# ifdef GLEW_MX
# define GLXEW_GET_VAR(x) (glxewGetContext()->x)
# else /* GLEW_MX */
# define GLXEW_GET_VAR(x) (x)
# endif /* GLEW_MX */
#endif /* GLXEW_GET_VAR */
/*
* 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;
if (s == NULL) return 0;
while (s[i] != '\0') i++;
return i;
}
static GLuint _glewStrCLen (const GLubyte* s, GLubyte c)
{
GLuint i=0;
if (s == NULL) return 0;
while (s[i] != '\0' && s[i] != c) i++;
return (s[i] == '\0' || s[i] == c) ? i : 0;
}
static GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)
{
GLuint i=0;
if(a == NULL || b == NULL)
return (a == NULL && b == NULL && n == 0) ? GL_TRUE : GL_FALSE;
while (i < n && a[i] != '\0' && b[i] != '\0' && a[i] == b[i]) i++;
return i == n ? GL_TRUE : GL_FALSE;
}
static GLboolean _glewStrSame1 (const 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 (const 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 (const 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;
}
/*
* 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.
*/
static GLboolean _glewSearchExtension (const char* name, const GLubyte *start, const GLubyte *end)
{
const GLubyte* p;
GLuint len = _glewStrLen((const GLubyte*)name);
p = start;
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;
}
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