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/* -----------------------------------------------------------------------------
*
* Module : C support for Graphics.Rendering.OpenGL.GL.Extensions
* Copyright : (c) Sven Panne 2002-2004
* License : BSD-style (see the file libraries/GLUT/LICENSE)
*
* Maintainer : sven.panne@aedion.de
* Stability : experimental
* Portability : portable
*
* -------------------------------------------------------------------------- */
#include "HsOpenGL.h"
#include <string.h>
#if defined(_WIN32)
#define hOpenGL_gpa(x) wglGetProcAddress((LPCSTR)(x))
#elif defined(USE_QUARTZ_OPENGL)
#include <mach-o/dyld.h>
#include <stdlib.h>
#include <stdio.h>
static void*
hOpenGL_gpa(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);
}
/* ToDo: This should really be based on a feature test. */
#elif defined(__sgi) || defined (__sun)
#include <dlfcn.h>
static const char* gpaNames[] = {
"glXGetProcAddress", "glXGetProcAddressARB", "glXGetProcAddressEXT",
"_glXGetProcAddress", "_glXGetProcAddressARB", "_glXGetProcAddressEXT"
};
static void*
hOpenGL_gpa(const char *name)
{
static int firstTime = 1;
static void *handle = NULL;
static void *gpa = NULL;
if (firstTime) {
firstTime = 0;
/* Get a handle for our executable. */
handle = dlopen(NULL, RTLD_LAZY);
/* If fail this early, there's not much we can do about it. */
if (!handle) {
return NULL;
}
{
/* Let's see if our platform supports a glXGetProcAddress() variant. */
int numNames = (int)(sizeof(gpaNames) / sizeof(gpaNames[0]));
int i;
for (i = 0; (!gpa) && (i < numNames); ++i) {
gpa = dlsym(handle, gpaNames[i]);
}
}
}
if (gpa) {
/* Fine, we seem to have some kind of glXGetProcAddress(), so use it. */
return ((void *(*)(const GLubyte *))gpa)(name);
} else if (handle) {
/* Fallback to dlsym() if we have no glXGetProcAddress(), although we then
ignore the fact that OpenGL entry points could be context dependent. */
return dlsym(handle, name);
} else {
return NULL;
}
}
#else
#define hOpenGL_gpa(x) glXGetProcAddressARB((const GLubyte*)(x))
#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)
{
void* addr = hOpenGL_gpa(procName);
if (addr) {
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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