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/* -----------------------------------------------------------------------------
*
* Module : C support for Graphics.Rendering.OpenGL.GL.Extensions
* Copyright : (c) Sven Panne 2003
* License : BSD-style (see the file libraries/GLUT/LICENSE)
*
* Maintainer : sven_panne@yahoo.com
* Stability : experimental
* Portability : portable
*
* -------------------------------------------------------------------------- */
#include "HsOpenGL.h"
#include <string.h>
#ifdef USE_QUARTZ_OPENGL
#include <mach-o/dyld.h>
#include <stdlib.h>
#include <stdio.h>
static void*
NSGLGetProcAddress(const char *name)
{
NSSymbol symbol;
/* Prepend a '_' for the Unix C symbol mangling convention */
char* symbolName = (char*)malloc(strlen(name) + 2);
if (!symbolName) {
fprintf(stderr, "Failed to allocate memory for NSGLGetProcAddress\n");
return NULL;
}
symbolName[0] = '_';
strcpy(symbolName + 1, name);
if (!NSIsSymbolNameDefined(symbolName)) {
free(symbolName);
return NULL;
}
symbol = NSLookupAndBindSymbol(symbolName);
free(symbolName);
if (!symbol) {
return NULL;
}
return NSAddressOfSymbol(symbol);
}
#endif
/* procName is really a const char*, but currently we can't specify this in
Haskell's FFI and consequently get a warning from the C compiler. */
void*
hOpenGL_getProcAddress(char *procName)
{
#if defined(_WIN32)
void* addr = wglGetProcAddress((LPCSTR)procName);
#elif defined(USE_QUARTZ_OPENGL)
void *addr = NSGLGetProcAddress(procName);
#else
void* addr = glXGetProcAddressARB((const GLubyte*)procName);
#endif
if (addr != NULL) {
return addr;
}
/* There is no way to get GLU extensions at runtime so we fake this, being
careful about GLU headers on WinDoze, which have a bad habit of lying
about their actual version. */
#if defined(GLU_VERSION_1_3) && !defined(_WIN32)
if (strcmp(procName, "gluUnProject4") == 0) {
return gluUnProject4;
}
if (strcmp(procName, "gluBuild3DMipmapLevels") == 0) {
return gluBuild3DMipmapLevels;
}
#endif
return NULL;
}
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