mirror of
https://github.com/nigels-com/glew.git
synced 2025-10-31 04:32:20 +00:00
286 lines
7.7 KiB
C
286 lines
7.7 KiB
C
#include <GL/glew.h>
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#if defined(_WIN32)
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# include <GL/wglew.h>
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#elif !defined(__ANDROID__) && !defined(__native_client__) && !defined(__HAIKU__) && (!defined(__APPLE__) || defined(GLEW_APPLE_GLX))
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# include <GL/glxew.h>
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#endif
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#include <stddef.h> /* For size_t */
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/*
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* Define glewGetContext and related helper macros.
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*/
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#ifdef GLEW_MX
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# define glewGetContext() ctx
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# ifdef _WIN32
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# define GLEW_CONTEXT_ARG_DEF_INIT GLEWContext* ctx
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# define GLEW_CONTEXT_ARG_VAR_INIT ctx
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# define wglewGetContext() ctx
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# define WGLEW_CONTEXT_ARG_DEF_INIT WGLEWContext* ctx
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# define WGLEW_CONTEXT_ARG_DEF_LIST WGLEWContext* ctx
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# else /* _WIN32 */
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# define GLEW_CONTEXT_ARG_DEF_INIT void
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# define GLEW_CONTEXT_ARG_VAR_INIT
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# define glxewGetContext() ctx
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# define GLXEW_CONTEXT_ARG_DEF_INIT void
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# define GLXEW_CONTEXT_ARG_DEF_LIST GLXEWContext* ctx
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# endif /* _WIN32 */
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# define GLEW_CONTEXT_ARG_DEF_LIST GLEWContext* ctx
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#else /* GLEW_MX */
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# define GLEW_CONTEXT_ARG_DEF_INIT void
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# define GLEW_CONTEXT_ARG_VAR_INIT
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# define GLEW_CONTEXT_ARG_DEF_LIST void
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# define WGLEW_CONTEXT_ARG_DEF_INIT void
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# define WGLEW_CONTEXT_ARG_DEF_LIST void
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# define GLXEW_CONTEXT_ARG_DEF_INIT void
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# define GLXEW_CONTEXT_ARG_DEF_LIST void
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#endif /* GLEW_MX */
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#if defined(GLEW_REGAL)
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/* In GLEW_REGAL mode we call direcly into the linked
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libRegal.so glGetProcAddressREGAL for looking up
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the GL function pointers. */
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# undef glGetProcAddressREGAL
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# ifdef WIN32
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extern void * __stdcall glGetProcAddressREGAL(const GLchar *name);
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static void * (__stdcall * regalGetProcAddress) (const GLchar *) = glGetProcAddressREGAL;
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# else
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extern void * glGetProcAddressREGAL(const GLchar *name);
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static void * (*regalGetProcAddress) (const GLchar *) = glGetProcAddressREGAL;
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# endif
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# define glGetProcAddressREGAL GLEW_GET_FUN(__glewGetProcAddressREGAL)
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#elif defined(__sgi) || defined (__sun) || defined(__HAIKU__) || defined(GLEW_APPLE_GLX)
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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void* dlGetProcAddress (const GLubyte* name)
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{
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static void* h = NULL;
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static void* gpa;
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if (h == NULL)
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{
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if ((h = dlopen(NULL, RTLD_LAZY | RTLD_LOCAL)) == NULL) return NULL;
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gpa = dlsym(h, "glXGetProcAddress");
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}
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if (gpa != NULL)
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return ((void*(*)(const GLubyte*))gpa)(name);
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else
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return dlsym(h, (const char*)name);
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}
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#endif /* __sgi || __sun || GLEW_APPLE_GLX */
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#if defined(__APPLE__)
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#include <stdlib.h>
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#include <string.h>
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#include <AvailabilityMacros.h>
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#ifdef MAC_OS_X_VERSION_10_3
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#include <dlfcn.h>
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void* NSGLGetProcAddress (const GLubyte *name)
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{
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static void* image = NULL;
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void* addr;
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if (NULL == image)
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{
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image = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY);
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}
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if( !image ) return NULL;
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addr = dlsym(image, (const char*)name);
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if( addr ) return addr;
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#ifdef GLEW_APPLE_GLX
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return dlGetProcAddress( name ); // try next for glx symbols
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#else
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return NULL;
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#endif
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}
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#else
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#include <mach-o/dyld.h>
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void* NSGLGetProcAddress (const GLubyte *name)
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{
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static const struct mach_header* image = NULL;
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NSSymbol symbol;
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char* symbolName;
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if (NULL == image)
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{
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image = NSAddImage("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", NSADDIMAGE_OPTION_RETURN_ON_ERROR);
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}
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/* prepend a '_' for the Unix C symbol mangling convention */
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symbolName = malloc(strlen((const char*)name) + 2);
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strcpy(symbolName+1, (const char*)name);
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symbolName[0] = '_';
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symbol = NULL;
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/* if (NSIsSymbolNameDefined(symbolName))
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symbol = NSLookupAndBindSymbol(symbolName); */
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symbol = image ? NSLookupSymbolInImage(image, symbolName, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND | NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR) : NULL;
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free(symbolName);
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if( symbol ) return NSAddressOfSymbol(symbol);
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#ifdef GLEW_APPLE_GLX
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return dlGetProcAddress( name ); // try next for glx symbols
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#else
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return NULL;
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#endif
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}
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#endif /* MAC_OS_X_VERSION_10_3 */
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#endif /* __APPLE__ */
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/*
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* Define glewGetProcAddress.
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*/
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#if defined(GLEW_REGAL)
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# define glewGetProcAddress(name) regalGetProcAddress((const GLchar *) name)
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#elif defined(_WIN32)
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# define glewGetProcAddress(name) wglGetProcAddress((LPCSTR)name)
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#elif defined(__APPLE__) && !defined(GLEW_APPLE_GLX)
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# define glewGetProcAddress(name) NSGLGetProcAddress(name)
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#elif defined(__sgi) || defined(__sun) || defined(__HAIKU__)
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# define glewGetProcAddress(name) dlGetProcAddress(name)
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#elif defined(__ANDROID__)
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# define glewGetProcAddress(name) NULL /* TODO */
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#elif defined(__native_client__)
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# define glewGetProcAddress(name) NULL /* TODO */
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#else /* __linux */
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# define glewGetProcAddress(name) (*glXGetProcAddressARB)(name)
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#endif
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/*
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* Redefine GLEW_GET_VAR etc without const cast
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*/
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#undef GLEW_GET_VAR
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#ifdef GLEW_MX
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# define GLEW_GET_VAR(x) (glewGetContext()->x)
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#else /* GLEW_MX */
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# define GLEW_GET_VAR(x) (x)
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#endif /* GLEW_MX */
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#ifdef WGLEW_GET_VAR
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# undef WGLEW_GET_VAR
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# ifdef GLEW_MX
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# define WGLEW_GET_VAR(x) (wglewGetContext()->x)
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# else /* GLEW_MX */
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# define WGLEW_GET_VAR(x) (x)
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# endif /* GLEW_MX */
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#endif /* WGLEW_GET_VAR */
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#ifdef GLXEW_GET_VAR
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# undef GLXEW_GET_VAR
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# ifdef GLEW_MX
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# define GLXEW_GET_VAR(x) (glxewGetContext()->x)
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# else /* GLEW_MX */
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# define GLXEW_GET_VAR(x) (x)
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# endif /* GLEW_MX */
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#endif /* GLXEW_GET_VAR */
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/*
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* GLEW, just like OpenGL or GLU, does not rely on the standard C library.
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* These functions implement the functionality required in this file.
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*/
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static GLuint _glewStrLen (const GLubyte* s)
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{
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GLuint i=0;
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if (s == NULL) return 0;
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while (s[i] != '\0') i++;
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return i;
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}
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static GLuint _glewStrCLen (const GLubyte* s, GLubyte c)
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{
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GLuint i=0;
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if (s == NULL) return 0;
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while (s[i] != '\0' && s[i] != c) i++;
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return (s[i] == '\0' || s[i] == c) ? i : 0;
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}
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static GLboolean _glewStrSame (const GLubyte* a, const GLubyte* b, GLuint n)
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{
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GLuint i=0;
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if(a == NULL || b == NULL)
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return (a == NULL && b == NULL && n == 0) ? GL_TRUE : GL_FALSE;
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while (i < n && a[i] != '\0' && b[i] != '\0' && a[i] == b[i]) i++;
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return i == n ? GL_TRUE : GL_FALSE;
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}
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static GLboolean _glewStrSame1 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
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{
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while (*na > 0 && (**a == ' ' || **a == '\n' || **a == '\r' || **a == '\t'))
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{
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(*a)++;
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(*na)--;
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}
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if(*na >= nb)
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{
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GLuint i=0;
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while (i < nb && (*a)+i != NULL && b+i != NULL && (*a)[i] == b[i]) i++;
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if(i == nb)
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{
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*a = *a + nb;
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*na = *na - nb;
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return GL_TRUE;
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}
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}
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return GL_FALSE;
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}
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static GLboolean _glewStrSame2 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
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{
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if(*na >= nb)
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{
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GLuint i=0;
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while (i < nb && (*a)+i != NULL && b+i != NULL && (*a)[i] == b[i]) i++;
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if(i == nb)
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{
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*a = *a + nb;
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*na = *na - nb;
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return GL_TRUE;
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}
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}
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return GL_FALSE;
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}
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static GLboolean _glewStrSame3 (const GLubyte** a, GLuint* na, const GLubyte* b, GLuint nb)
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{
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if(*na >= nb)
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{
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GLuint i=0;
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while (i < nb && (*a)+i != NULL && b+i != NULL && (*a)[i] == b[i]) i++;
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if (i == nb && (*na == nb || (*a)[i] == ' ' || (*a)[i] == '\n' || (*a)[i] == '\r' || (*a)[i] == '\t'))
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{
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*a = *a + nb;
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*na = *na - nb;
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return GL_TRUE;
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}
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}
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return GL_FALSE;
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}
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/*
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* Search for name in the extensions string. Use of strstr()
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* is not sufficient because extension names can be prefixes of
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* other extension names. Could use strtok() but the constant
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* string returned by glGetString might be in read-only memory.
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*/
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static GLboolean _glewSearchExtension (const char* name, const GLubyte *start, const GLubyte *end)
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{
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const GLubyte* p;
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GLuint len = _glewStrLen((const GLubyte*)name);
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p = start;
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while (p < end)
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{
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GLuint n = _glewStrCLen(p, ' ');
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if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
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p += n+1;
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}
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return GL_FALSE;
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}
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