mirror of
https://github.com/reactos/reactos.git
synced 2024-08-24 20:28:57 +00:00
203 lines
4.5 KiB
C
203 lines
4.5 KiB
C
/*
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* ReactOS Gdi32
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* Copyright (C) 2003 ReactOS Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*
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*
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*
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*/
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#include <precomp.h>
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#define NDEBUG
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#include <debug.h>
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typedef int (WINAPI *CHOOSEPIXELFMT) (HDC, CONST PIXELFORMATDESCRIPTOR *);
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typedef BOOL (WINAPI *SETPIXELFMT) (HDC, int, CONST PIXELFORMATDESCRIPTOR *);
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typedef BOOL (WINAPI *SWAPBUFFERS) (HDC hdc);
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typedef int (WINAPI *DESCRIBEPIXELFMT) (HDC, int, UINT, LPPIXELFORMATDESCRIPTOR);
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typedef int (WINAPI *GETPIXELFMT) (HDC);
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static CHOOSEPIXELFMT glChoosePixelFormat = NULL;
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static SETPIXELFMT glSetPixelFormat = NULL;
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static SWAPBUFFERS glSwapBuffers = NULL;
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static DESCRIBEPIXELFMT glDescribePixelFormat = NULL;
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static GETPIXELFMT glGetPixelFormat = NULL;
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/*
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OpenGL Handle.
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*/
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HINSTANCE hOpenGL = NULL;
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static BOOL OpenGLInitFunction(PCSTR name,
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FARPROC *funcptr)
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{
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PVOID func;
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func = (PVOID)GetProcAddress(hOpenGL, name);
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if (func != NULL)
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{
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(void)InterlockedCompareExchangePointer((PVOID*)funcptr,
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func,
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NULL);
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return TRUE;
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}
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return FALSE;
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}
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static BOOL OpenGLEnable(void)
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{
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HMODULE hModOpengl32;
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BOOL Ret = TRUE;
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hModOpengl32 = LoadLibraryW(L"OPENGL32.DLL");
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if (hModOpengl32 == NULL)
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return FALSE;
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if (InterlockedCompareExchangePointer((PVOID*)&hOpenGL,
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(PVOID)hModOpengl32,
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NULL) != NULL)
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{
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FreeLibrary(hModOpengl32);
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/* NOTE: Even though another thread was faster loading the
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library we can't just bail out here. We really need
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to *try* to locate every function. This is slow but
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thread-safe */
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}
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if (!OpenGLInitFunction("wglChoosePixelFormat", &glChoosePixelFormat))
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Ret = FALSE;
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if (!OpenGLInitFunction("wglSetPixelFormat", &glSetPixelFormat))
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Ret = FALSE;
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if (!OpenGLInitFunction("wglSwapBuffers", &glSwapBuffers))
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Ret = FALSE;
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if (!OpenGLInitFunction("wglDescribePixelFormat", &glDescribePixelFormat))
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Ret = FALSE;
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if (!OpenGLInitFunction("wglGetPixelFormat", &glGetPixelFormat))
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Ret = FALSE;
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return Ret;
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}
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/*
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* @implemented
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*/
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INT
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WINAPI
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ChoosePixelFormat(HDC hdc,
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CONST PIXELFORMATDESCRIPTOR * ppfd)
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{
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if (glChoosePixelFormat == NULL)
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if (OpenGLEnable() == FALSE)
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return(0);
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return(glChoosePixelFormat(hdc, ppfd));
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}
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/*
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* @implemented
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*/
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INT
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WINAPI
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DescribePixelFormat(HDC hdc,
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INT iPixelFormat,
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UINT nBytes,
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LPPIXELFORMATDESCRIPTOR ppfd)
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{
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if (glDescribePixelFormat == NULL)
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if (OpenGLEnable() == FALSE)
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return(0);
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return(glDescribePixelFormat(hdc, iPixelFormat, nBytes, ppfd));
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}
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/*
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* @implemented
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*/
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INT
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WINAPI
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GetPixelFormat(HDC hdc)
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{
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if (glGetPixelFormat == NULL)
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if (OpenGLEnable() == FALSE)
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return(0);
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return(glGetPixelFormat(hdc));
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}
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/*
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* @implemented
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*/
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BOOL
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WINAPI
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SetPixelFormat(HDC hdc,
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INT iPixelFormat,
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CONST PIXELFORMATDESCRIPTOR * ppfd)
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{
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/* Can only be set once */
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INT current = GetPixelFormat(hdc);
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if(current) return current == iPixelFormat ;
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if (glSetPixelFormat == NULL)
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if (OpenGLEnable() == FALSE)
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return(0);
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return(glSetPixelFormat(hdc, iPixelFormat, ppfd));
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}
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/*
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* @implemented
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*/
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BOOL
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WINAPI
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SwapBuffers(HDC hdc)
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{
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if (glSwapBuffers == NULL)
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if (OpenGLEnable() == FALSE)
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return(0);
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return(glSwapBuffers(hdc));
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}
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/*
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Do this here for now.
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*/
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/* EOF */
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