reactos/win32ss/gdi/gdi32/misc/wingl.c

203 lines
4.5 KiB
C

/*
* ReactOS Gdi32
* Copyright (C) 2003 ReactOS Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*
*
*
*/
#include <precomp.h>
#define NDEBUG
#include <debug.h>
typedef int (WINAPI *CHOOSEPIXELFMT) (HDC, CONST PIXELFORMATDESCRIPTOR *);
typedef BOOL (WINAPI *SETPIXELFMT) (HDC, int, CONST PIXELFORMATDESCRIPTOR *);
typedef BOOL (WINAPI *SWAPBUFFERS) (HDC hdc);
typedef int (WINAPI *DESCRIBEPIXELFMT) (HDC, int, UINT, LPPIXELFORMATDESCRIPTOR);
typedef int (WINAPI *GETPIXELFMT) (HDC);
static CHOOSEPIXELFMT glChoosePixelFormat = NULL;
static SETPIXELFMT glSetPixelFormat = NULL;
static SWAPBUFFERS glSwapBuffers = NULL;
static DESCRIBEPIXELFMT glDescribePixelFormat = NULL;
static GETPIXELFMT glGetPixelFormat = NULL;
/*
OpenGL Handle.
*/
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)
{
HMODULE hModOpengl32;
BOOL Ret = TRUE;
hModOpengl32 = LoadLibraryW(L"OPENGL32.DLL");
if (hModOpengl32 == NULL)
return FALSE;
if (InterlockedCompareExchangePointer((PVOID*)&hOpenGL,
(PVOID)hModOpengl32,
NULL) != NULL)
{
FreeLibrary(hModOpengl32);
/* 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 (!OpenGLInitFunction("wglChoosePixelFormat", &glChoosePixelFormat))
Ret = FALSE;
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;
}
/*
* @implemented
*/
INT
WINAPI
ChoosePixelFormat(HDC hdc,
CONST PIXELFORMATDESCRIPTOR * ppfd)
{
if (glChoosePixelFormat == NULL)
if (OpenGLEnable() == FALSE)
return(0);
return(glChoosePixelFormat(hdc, ppfd));
}
/*
* @implemented
*/
INT
WINAPI
DescribePixelFormat(HDC hdc,
INT iPixelFormat,
UINT nBytes,
LPPIXELFORMATDESCRIPTOR ppfd)
{
if (glDescribePixelFormat == NULL)
if (OpenGLEnable() == FALSE)
return(0);
return(glDescribePixelFormat(hdc, iPixelFormat, nBytes, ppfd));
}
/*
* @implemented
*/
INT
WINAPI
GetPixelFormat(HDC hdc)
{
if (glGetPixelFormat == NULL)
if (OpenGLEnable() == FALSE)
return(0);
return(glGetPixelFormat(hdc));
}
/*
* @implemented
*/
BOOL
WINAPI
SetPixelFormat(HDC hdc,
INT iPixelFormat,
CONST PIXELFORMATDESCRIPTOR * ppfd)
{
/* Can only be set once */
INT current = GetPixelFormat(hdc);
if(current) return current == iPixelFormat ;
if (glSetPixelFormat == NULL)
if (OpenGLEnable() == FALSE)
return(0);
return(glSetPixelFormat(hdc, iPixelFormat, ppfd));
}
/*
* @implemented
*/
BOOL
WINAPI
SwapBuffers(HDC hdc)
{
if (glSwapBuffers == NULL)
if (OpenGLEnable() == FALSE)
return(0);
return(glSwapBuffers(hdc));
}
/*
Do this here for now.
*/
/* EOF */