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Make opengl initialization thread-safe

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svn path=/trunk/; revision=30429
This commit is contained in:
Thomas Bluemel 2007-11-13 23:30:17 +00:00
parent d3e6d6d283
commit 65636af627
1 changed files with 47 additions and 32 deletions
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79
reactos/dll/win32/gdi32/misc/wingl.c
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@ -46,46 +46,61 @@ static GETPIXELFMT glGetPixelFormat = NULL;
*/
HINSTANCE hOpenGL = NULL;
static BOOL OpenGLInitFunction(PCSTR name,
FARPROC *funcptr)
{
PVOID func;
func = (PVOID)GetProcAddress(hOpenGL, name);
if (func != NULL)
{
(void)InterlockedCompareExchangePointer((PVOID*)funcptr,
func,
NULL);
return TRUE;
}
return FALSE;
}
static BOOL OpenGLEnable(void)
{
if(hOpenGL == NULL)
{
hOpenGL = LoadLibraryA("OPENGL32.DLL");
if(hOpenGL == NULL)
return(FALSE);
}
HMODULE hModOpengl32;
BOOL Ret = TRUE;
if(glChoosePixelFormat == NULL) {
glChoosePixelFormat = (CHOOSEPIXELFMT)GetProcAddress(hOpenGL, "wglChoosePixelFormat");
if(glChoosePixelFormat == NULL)
return(FALSE);
}
hModOpengl32 = LoadLibraryW(L"OPENGL32.DLL");
if (hModOpengl32 == NULL)
return FALSE;
if(glSetPixelFormat == NULL) {
glSetPixelFormat = (SETPIXELFMT)GetProcAddress(hOpenGL, "wglSetPixelFormat");
if(glSetPixelFormat == NULL)
return(FALSE);
}
if (InterlockedCompareExchangePointer((PVOID*)&hOpenGL,
(PVOID)hModOpengl32,
NULL) != NULL)
{
FreeLibrary(hModOpengl32);
if(glSwapBuffers == NULL) {
glSwapBuffers = (SWAPBUFFERS)GetProcAddress(hOpenGL, "wglSwapBuffers");
if(glSwapBuffers == NULL)
return(FALSE);
}
/* NOTE: Even though another thread was faster loading the
library we can't just bail out here. We really need
to *try* to locate every function. This is slow but
thread-safe */
}
if(glDescribePixelFormat == NULL) {
glDescribePixelFormat = (DESCRIBEPIXELFMT)GetProcAddress(hOpenGL, "wglDescribePixelFormat");
if(glDescribePixelFormat == NULL)
return(FALSE);
}
if(glGetPixelFormat == NULL) {
glGetPixelFormat = (GETPIXELFMT)GetProcAddress(hOpenGL, "wglGetPixelFormat");
if(glGetPixelFormat == NULL)
return(FALSE);
}
if (!OpenGLInitFunction("wglChoosePixelFormat", &glChoosePixelFormat))
Ret = FALSE;
return(TRUE); /* OpenGL is initialized and enabled*/
if (!OpenGLInitFunction("wglSetPixelFormat", &glSetPixelFormat))
Ret = FALSE;
if (!OpenGLInitFunction("wglSwapBuffers", &glSwapBuffers))
Ret = FALSE;
if (!OpenGLInitFunction("wglDescribePixelFormat", &glDescribePixelFormat))
Ret = FALSE;
if (!OpenGLInitFunction("wglGetPixelFormat", &glGetPixelFormat))
Ret = FALSE;
return Ret;
}