| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 Sam Lantinga |
| |
| 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 St, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| Sam Lantinga |
| slouken@libsdl.org |
| */ |
| #include "SDL_config.h" |
| |
| /* WGL implementation of SDL OpenGL support */ |
| |
| #if SDL_VIDEO_OPENGL |
| #include "SDL_opengl.h" |
| #endif |
| #include "SDL_lowvideo.h" |
| #include "SDL_wingl_c.h" |
| |
| #if SDL_VIDEO_OPENGL |
| #define DEFAULT_GL_DRIVER_PATH "OPENGL32.DLL" |
| #endif |
| |
| /* If setting the HDC fails, we may need to recreate the window (MSDN) */ |
| static int WIN_GL_ResetWindow(_THIS) |
| { |
| int status = 0; |
| |
| #ifndef _WIN32_WCE /* FIXME WinCE needs the UNICODE version of CreateWindow() */ |
| /* This doesn't work with DirectX code (see CVS comments) */ |
| /* If we were passed a window, then we can't create a new one */ |
| if ( !SDL_windowid && SDL_strcmp(this->name, "windib") == 0 ) { |
| /* Save the existing window attributes */ |
| LONG style; |
| RECT rect = { 0, 0, 0, 0 }; |
| style = GetWindowLong(SDL_Window, GWL_STYLE); |
| GetWindowRect(SDL_Window, &rect); |
| DestroyWindow(SDL_Window); |
| WIN_FlushMessageQueue(); |
| |
| SDL_resizing = 1; |
| SDL_Window = CreateWindow(SDL_Appname, SDL_Appname, |
| style, |
| rect.left, rect.top, |
| (rect.right-rect.left)+1, |
| (rect.bottom-rect.top)+1, |
| NULL, NULL, SDL_Instance, NULL); |
| WIN_FlushMessageQueue(); |
| SDL_resizing = 0; |
| |
| if ( SDL_Window ) { |
| this->SetCaption(this, this->wm_title, this->wm_icon); |
| } else { |
| SDL_SetError("Couldn't create window"); |
| status = -1; |
| } |
| } else |
| #endif /* !_WIN32_WCE */ |
| { |
| SDL_SetError("Unable to reset window for OpenGL context"); |
| status = -1; |
| } |
| return(status); |
| } |
| |
| #if SDL_VIDEO_OPENGL |
| |
| static int ExtensionSupported(const char *extension, const char *extensions) |
| { |
| const char *start; |
| const char *where, *terminator; |
| |
| /* Extension names should not have spaces. */ |
| where = SDL_strchr(extension, ' '); |
| if ( where || *extension == '\0' ) |
| return 0; |
| |
| if ( ! extensions ) |
| return 0; |
| |
| /* It takes a bit of care to be fool-proof about parsing the |
| * OpenGL extensions string. Don't be fooled by sub-strings, |
| * etc. */ |
| |
| start = extensions; |
| |
| for (;;) |
| { |
| where = SDL_strstr(start, extension); |
| if (!where) break; |
| |
| terminator = where + SDL_strlen(extension); |
| if (where == start || *(where - 1) == ' ') |
| if (*terminator == ' ' || *terminator == '\0') return 1; |
| |
| start = terminator; |
| } |
| |
| return 0; |
| } |
| |
| static int ChoosePixelFormatARB(_THIS, const int *iAttribs, const FLOAT *fAttribs) |
| { |
| HWND hwnd; |
| HDC hdc; |
| HGLRC hglrc; |
| const char * (WINAPI *wglGetExtensionsStringARB)(HDC) = 0; |
| const char *extensions; |
| int pformat = 0; |
| UINT matches = 0; |
| |
| hwnd = CreateWindow(SDL_Appname, SDL_Appname, WS_POPUP | WS_DISABLED, |
| 0, 0, 10, 10, |
| NULL, NULL, SDL_Instance, NULL); |
| WIN_FlushMessageQueue(); |
| |
| hdc = GetDC(hwnd); |
| |
| SetPixelFormat(hdc, ChoosePixelFormat(hdc, &GL_pfd), &GL_pfd); |
| |
| hglrc = this->gl_data->wglCreateContext(hdc); |
| if ( hglrc ) { |
| this->gl_data->wglMakeCurrent(hdc, hglrc); |
| } |
| |
| wglGetExtensionsStringARB = (const char * (WINAPI *)(HDC)) |
| this->gl_data->wglGetProcAddress("wglGetExtensionsStringARB"); |
| |
| if( wglGetExtensionsStringARB ) { |
| extensions = wglGetExtensionsStringARB(hdc); |
| } else { |
| extensions = NULL; |
| } |
| |
| this->gl_data->WGL_ARB_pixel_format = 0; |
| if( ExtensionSupported("WGL_ARB_pixel_format", extensions) ) { |
| BOOL (WINAPI *wglChoosePixelFormatARB)(HDC hdc, const int *piAttribIList, const FLOAT *pfAttribFList, UINT nMaxFormats, int *piFormats, UINT *nNumFormats); |
| wglChoosePixelFormatARB = |
| (BOOL (WINAPI *)(HDC, const int *, const FLOAT *, UINT, int *, UINT *)) |
| this->gl_data->wglGetProcAddress("wglChoosePixelFormatARB"); |
| if( wglChoosePixelFormatARB && |
| wglChoosePixelFormatARB(hdc, iAttribs, fAttribs, 1, &pformat, &matches) && pformat ) { |
| this->gl_data->WGL_ARB_pixel_format = 1; |
| } |
| } |
| |
| if ( hglrc ) { |
| this->gl_data->wglMakeCurrent(NULL, NULL); |
| this->gl_data->wglDeleteContext(hglrc); |
| } |
| ReleaseDC(hwnd, hdc); |
| DestroyWindow(hwnd); |
| WIN_FlushMessageQueue(); |
| |
| return pformat; |
| } |
| |
| #endif /* SDL_VIDEO_OPENGL */ |
| |
| int WIN_GL_SetupWindow(_THIS) |
| { |
| int retval; |
| #if SDL_VIDEO_OPENGL |
| int i; |
| int iAttribs[64]; |
| int *iAttr; |
| int *iAccelAttr = NULL; |
| float fAttribs[1] = { 0 }; |
| const GLubyte *(WINAPI *glGetStringFunc)(GLenum); |
| const char *wglext; |
| |
| /* load the gl driver from a default path */ |
| if ( ! this->gl_config.driver_loaded ) { |
| /* no driver has been loaded, use default (ourselves) */ |
| if ( WIN_GL_LoadLibrary(this, NULL) < 0 ) { |
| return(-1); |
| } |
| } |
| |
| /* Set up the pixel format descriptor with our needed format */ |
| SDL_memset(&GL_pfd, 0, sizeof(GL_pfd)); |
| GL_pfd.nSize = sizeof(GL_pfd); |
| GL_pfd.nVersion = 1; |
| GL_pfd.dwFlags = (PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL); |
| if ( this->gl_config.double_buffer ) { |
| GL_pfd.dwFlags |= PFD_DOUBLEBUFFER; |
| } |
| if ( this->gl_config.stereo ) { |
| GL_pfd.dwFlags |= PFD_STEREO; |
| } |
| GL_pfd.iPixelType = PFD_TYPE_RGBA; |
| GL_pfd.cColorBits = this->gl_config.buffer_size; |
| GL_pfd.cRedBits = this->gl_config.red_size; |
| GL_pfd.cGreenBits = this->gl_config.green_size; |
| GL_pfd.cBlueBits = this->gl_config.blue_size; |
| GL_pfd.cAlphaBits = this->gl_config.alpha_size; |
| GL_pfd.cAccumRedBits = this->gl_config.accum_red_size; |
| GL_pfd.cAccumGreenBits = this->gl_config.accum_green_size; |
| GL_pfd.cAccumBlueBits = this->gl_config.accum_blue_size; |
| GL_pfd.cAccumAlphaBits = this->gl_config.accum_alpha_size; |
| GL_pfd.cAccumBits = |
| (GL_pfd.cAccumRedBits + GL_pfd.cAccumGreenBits + |
| GL_pfd.cAccumBlueBits + GL_pfd.cAccumAlphaBits); |
| GL_pfd.cDepthBits = this->gl_config.depth_size; |
| GL_pfd.cStencilBits = this->gl_config.stencil_size; |
| |
| /* setup WGL_ARB_pixel_format attribs */ |
| iAttr = &iAttribs[0]; |
| |
| *iAttr++ = WGL_DRAW_TO_WINDOW_ARB; |
| *iAttr++ = GL_TRUE; |
| *iAttr++ = WGL_RED_BITS_ARB; |
| *iAttr++ = this->gl_config.red_size; |
| *iAttr++ = WGL_GREEN_BITS_ARB; |
| *iAttr++ = this->gl_config.green_size; |
| *iAttr++ = WGL_BLUE_BITS_ARB; |
| *iAttr++ = this->gl_config.blue_size; |
| |
| /* We always choose either FULL or NO accel on Windows, because of flaky |
| drivers. If the app didn't specify, we use FULL, because that's |
| probably what they wanted (and if you didn't care and got FULL, that's |
| a perfectly valid result in any case. */ |
| *iAttr++ = WGL_ACCELERATION_ARB; |
| iAccelAttr = iAttr; |
| if (this->gl_config.accelerated) { |
| *iAttr++ = WGL_FULL_ACCELERATION_ARB; |
| } else { |
| *iAttr++ = WGL_NO_ACCELERATION_ARB; |
| } |
| |
| if ( this->gl_config.alpha_size ) { |
| *iAttr++ = WGL_ALPHA_BITS_ARB; |
| *iAttr++ = this->gl_config.alpha_size; |
| } |
| |
| *iAttr++ = WGL_DOUBLE_BUFFER_ARB; |
| *iAttr++ = this->gl_config.double_buffer; |
| |
| *iAttr++ = WGL_DEPTH_BITS_ARB; |
| *iAttr++ = this->gl_config.depth_size; |
| |
| if ( this->gl_config.stencil_size ) { |
| *iAttr++ = WGL_STENCIL_BITS_ARB; |
| *iAttr++ = this->gl_config.stencil_size; |
| } |
| |
| if ( this->gl_config.accum_red_size ) { |
| *iAttr++ = WGL_ACCUM_RED_BITS_ARB; |
| *iAttr++ = this->gl_config.accum_red_size; |
| } |
| |
| if ( this->gl_config.accum_green_size ) { |
| *iAttr++ = WGL_ACCUM_GREEN_BITS_ARB; |
| *iAttr++ = this->gl_config.accum_green_size; |
| } |
| |
| if ( this->gl_config.accum_blue_size ) { |
| *iAttr++ = WGL_ACCUM_BLUE_BITS_ARB; |
| *iAttr++ = this->gl_config.accum_blue_size; |
| } |
| |
| if ( this->gl_config.accum_alpha_size ) { |
| *iAttr++ = WGL_ACCUM_ALPHA_BITS_ARB; |
| *iAttr++ = this->gl_config.accum_alpha_size; |
| } |
| |
| if ( this->gl_config.stereo ) { |
| *iAttr++ = WGL_STEREO_ARB; |
| *iAttr++ = GL_TRUE; |
| } |
| |
| if ( this->gl_config.multisamplebuffers ) { |
| *iAttr++ = WGL_SAMPLE_BUFFERS_ARB; |
| *iAttr++ = this->gl_config.multisamplebuffers; |
| } |
| |
| if ( this->gl_config.multisamplesamples ) { |
| *iAttr++ = WGL_SAMPLES_ARB; |
| *iAttr++ = this->gl_config.multisamplesamples; |
| } |
| |
| *iAttr = 0; |
| |
| for ( i=0; ; ++i ) { |
| /* Get the window device context for our OpenGL drawing */ |
| GL_hdc = GetDC(SDL_Window); |
| if ( GL_hdc == NULL ) { |
| SDL_SetError("Unable to get DC for SDL_Window"); |
| return(-1); |
| } |
| |
| /* Choose and set the closest available pixel format */ |
| pixel_format = ChoosePixelFormatARB(this, iAttribs, fAttribs); |
| /* App said "don't care about accel" and FULL accel failed. Try NO. */ |
| if ( ( !pixel_format ) && ( this->gl_config.accelerated < 0 ) ) { |
| *iAccelAttr = WGL_NO_ACCELERATION_ARB; |
| pixel_format = ChoosePixelFormatARB(this, iAttribs, fAttribs); |
| *iAccelAttr = WGL_FULL_ACCELERATION_ARB; /* if we try again. */ |
| } |
| if ( !pixel_format ) { |
| pixel_format = ChoosePixelFormat(GL_hdc, &GL_pfd); |
| } |
| if ( !pixel_format ) { |
| SDL_SetError("No matching GL pixel format available"); |
| return(-1); |
| } |
| if ( !SetPixelFormat(GL_hdc, pixel_format, &GL_pfd) ) { |
| if ( i == 0 ) { |
| /* First time through, try resetting the window */ |
| if ( WIN_GL_ResetWindow(this) < 0 ) { |
| return(-1); |
| } |
| continue; |
| } |
| SDL_SetError("Unable to set HDC pixel format"); |
| return(-1); |
| } |
| /* We either succeeded or failed by this point */ |
| break; |
| } |
| DescribePixelFormat(GL_hdc, pixel_format, sizeof(GL_pfd), &GL_pfd); |
| |
| GL_hrc = this->gl_data->wglCreateContext(GL_hdc); |
| if ( GL_hrc == NULL ) { |
| SDL_SetError("Unable to create GL context"); |
| return(-1); |
| } |
| if ( WIN_GL_MakeCurrent(this) < 0 ) { |
| return(-1); |
| } |
| gl_active = 1; |
| |
| /* Get the wglGetPixelFormatAttribivARB pointer for the context */ |
| if ( this->gl_data->WGL_ARB_pixel_format ) { |
| this->gl_data->wglGetPixelFormatAttribivARB = |
| (BOOL (WINAPI *)(HDC, int, int, UINT, const int *, int *)) |
| this->gl_data->wglGetProcAddress("wglGetPixelFormatAttribivARB"); |
| } else { |
| this->gl_data->wglGetPixelFormatAttribivARB = NULL; |
| } |
| |
| /* Vsync control under Windows. Checking glGetString here is |
| * somewhat a documented and reliable hack - it was originally |
| * as a feature added by mistake, but since so many people rely |
| * on it, it will not be removed. strstr should be safe here.*/ |
| glGetStringFunc = WIN_GL_GetProcAddress(this, "glGetString"); |
| if ( glGetStringFunc ) { |
| wglext = (const char *)glGetStringFunc(GL_EXTENSIONS); |
| } else { |
| /* Uh oh, something is seriously wrong here... */ |
| wglext = NULL; |
| } |
| if ( wglext && SDL_strstr(wglext, "WGL_EXT_swap_control") ) { |
| this->gl_data->wglSwapIntervalEXT = WIN_GL_GetProcAddress(this, "wglSwapIntervalEXT"); |
| this->gl_data->wglGetSwapIntervalEXT = WIN_GL_GetProcAddress(this, "wglGetSwapIntervalEXT"); |
| } else { |
| this->gl_data->wglSwapIntervalEXT = NULL; |
| this->gl_data->wglGetSwapIntervalEXT = NULL; |
| } |
| if ( this->gl_config.swap_control >= 0 ) { |
| if ( this->gl_data->wglSwapIntervalEXT ) { |
| this->gl_data->wglSwapIntervalEXT(this->gl_config.swap_control); |
| } |
| } |
| #else |
| SDL_SetError("WIN driver not configured with OpenGL"); |
| #endif |
| if ( gl_active ) { |
| retval = 0; |
| } else { |
| retval = -1; |
| } |
| return(retval); |
| } |
| |
| void WIN_GL_ShutDown(_THIS) |
| { |
| #if SDL_VIDEO_OPENGL |
| /* Clean up OpenGL */ |
| if ( GL_hrc ) { |
| this->gl_data->wglMakeCurrent(NULL, NULL); |
| this->gl_data->wglDeleteContext(GL_hrc); |
| GL_hrc = NULL; |
| } |
| if ( GL_hdc ) { |
| ReleaseDC(SDL_Window, GL_hdc); |
| GL_hdc = NULL; |
| } |
| gl_active = 0; |
| |
| WIN_GL_UnloadLibrary(this); |
| #endif /* SDL_VIDEO_OPENGL */ |
| } |
| |
| #if SDL_VIDEO_OPENGL |
| |
| /* Make the current context active */ |
| int WIN_GL_MakeCurrent(_THIS) |
| { |
| int retval; |
| |
| retval = 0; |
| if ( ! this->gl_data->wglMakeCurrent(GL_hdc, GL_hrc) ) { |
| SDL_SetError("Unable to make GL context current"); |
| retval = -1; |
| } |
| return(retval); |
| } |
| |
| /* Get attribute data from wgl. */ |
| int WIN_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) |
| { |
| int retval; |
| |
| if (attrib == SDL_GL_SWAP_CONTROL) { |
| if ( this->gl_data->wglGetSwapIntervalEXT ) { |
| *value = this->gl_data->wglGetSwapIntervalEXT(); |
| return 0; |
| } |
| return -1; |
| } |
| |
| if ( this->gl_data->wglGetPixelFormatAttribivARB ) { |
| int wgl_attrib; |
| |
| switch(attrib) { |
| case SDL_GL_RED_SIZE: |
| wgl_attrib = WGL_RED_BITS_ARB; |
| break; |
| case SDL_GL_GREEN_SIZE: |
| wgl_attrib = WGL_GREEN_BITS_ARB; |
| break; |
| case SDL_GL_BLUE_SIZE: |
| wgl_attrib = WGL_BLUE_BITS_ARB; |
| break; |
| case SDL_GL_ALPHA_SIZE: |
| wgl_attrib = WGL_ALPHA_BITS_ARB; |
| break; |
| case SDL_GL_DOUBLEBUFFER: |
| wgl_attrib = WGL_DOUBLE_BUFFER_ARB; |
| break; |
| case SDL_GL_BUFFER_SIZE: |
| wgl_attrib = WGL_COLOR_BITS_ARB; |
| break; |
| case SDL_GL_DEPTH_SIZE: |
| wgl_attrib = WGL_DEPTH_BITS_ARB; |
| break; |
| case SDL_GL_STENCIL_SIZE: |
| wgl_attrib = WGL_STENCIL_BITS_ARB; |
| break; |
| case SDL_GL_ACCUM_RED_SIZE: |
| wgl_attrib = WGL_ACCUM_RED_BITS_ARB; |
| break; |
| case SDL_GL_ACCUM_GREEN_SIZE: |
| wgl_attrib = WGL_ACCUM_GREEN_BITS_ARB; |
| break; |
| case SDL_GL_ACCUM_BLUE_SIZE: |
| wgl_attrib = WGL_ACCUM_BLUE_BITS_ARB; |
| break; |
| case SDL_GL_ACCUM_ALPHA_SIZE: |
| wgl_attrib = WGL_ACCUM_ALPHA_BITS_ARB; |
| break; |
| case SDL_GL_STEREO: |
| wgl_attrib = WGL_STEREO_ARB; |
| break; |
| case SDL_GL_MULTISAMPLEBUFFERS: |
| wgl_attrib = WGL_SAMPLE_BUFFERS_ARB; |
| break; |
| case SDL_GL_MULTISAMPLESAMPLES: |
| wgl_attrib = WGL_SAMPLES_ARB; |
| break; |
| case SDL_GL_ACCELERATED_VISUAL: |
| wgl_attrib = WGL_ACCELERATION_ARB; |
| this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value); |
| if ( *value == WGL_NO_ACCELERATION_ARB ) { |
| *value = SDL_FALSE; |
| } else { |
| *value = SDL_TRUE; |
| } |
| return 0; |
| default: |
| return(-1); |
| } |
| this->gl_data->wglGetPixelFormatAttribivARB(GL_hdc, pixel_format, 0, 1, &wgl_attrib, value); |
| |
| return 0; |
| } |
| |
| retval = 0; |
| switch ( attrib ) { |
| case SDL_GL_RED_SIZE: |
| *value = GL_pfd.cRedBits; |
| break; |
| case SDL_GL_GREEN_SIZE: |
| *value = GL_pfd.cGreenBits; |
| break; |
| case SDL_GL_BLUE_SIZE: |
| *value = GL_pfd.cBlueBits; |
| break; |
| case SDL_GL_ALPHA_SIZE: |
| *value = GL_pfd.cAlphaBits; |
| break; |
| case SDL_GL_DOUBLEBUFFER: |
| if ( GL_pfd.dwFlags & PFD_DOUBLEBUFFER ) { |
| *value = 1; |
| } else { |
| *value = 0; |
| } |
| break; |
| case SDL_GL_BUFFER_SIZE: |
| *value = GL_pfd.cColorBits; |
| break; |
| case SDL_GL_DEPTH_SIZE: |
| *value = GL_pfd.cDepthBits; |
| break; |
| case SDL_GL_STENCIL_SIZE: |
| *value = GL_pfd.cStencilBits; |
| break; |
| case SDL_GL_ACCUM_RED_SIZE: |
| *value = GL_pfd.cAccumRedBits; |
| break; |
| case SDL_GL_ACCUM_GREEN_SIZE: |
| *value = GL_pfd.cAccumGreenBits; |
| break; |
| case SDL_GL_ACCUM_BLUE_SIZE: |
| *value = GL_pfd.cAccumBlueBits; |
| break; |
| case SDL_GL_ACCUM_ALPHA_SIZE: |
| *value = GL_pfd.cAccumAlphaBits; |
| break; |
| case SDL_GL_STEREO: |
| if ( GL_pfd.dwFlags & PFD_STEREO ) { |
| *value = 1; |
| } else { |
| *value = 0; |
| } |
| break; |
| case SDL_GL_MULTISAMPLEBUFFERS: |
| *value = 0; |
| break; |
| case SDL_GL_MULTISAMPLESAMPLES: |
| *value = 1; |
| break; |
| case SDL_GL_SWAP_CONTROL: |
| if ( this->gl_data->wglGetSwapIntervalEXT ) { |
| *value = this->gl_data->wglGetSwapIntervalEXT(); |
| return 0; |
| } else { |
| return -1; |
| } |
| break; |
| default: |
| retval = -1; |
| break; |
| } |
| return retval; |
| } |
| |
| void WIN_GL_SwapBuffers(_THIS) |
| { |
| SwapBuffers(GL_hdc); |
| } |
| |
| void WIN_GL_UnloadLibrary(_THIS) |
| { |
| if ( this->gl_config.driver_loaded ) { |
| FreeLibrary((HMODULE)this->gl_config.dll_handle); |
| |
| this->gl_data->wglGetProcAddress = NULL; |
| this->gl_data->wglCreateContext = NULL; |
| this->gl_data->wglDeleteContext = NULL; |
| this->gl_data->wglMakeCurrent = NULL; |
| this->gl_data->wglGetPixelFormatAttribivARB = NULL; |
| this->gl_data->wglSwapIntervalEXT = NULL; |
| this->gl_data->wglGetSwapIntervalEXT = NULL; |
| |
| this->gl_config.dll_handle = NULL; |
| this->gl_config.driver_loaded = 0; |
| } |
| } |
| |
| /* Passing a NULL path means load pointers from the application */ |
| int WIN_GL_LoadLibrary(_THIS, const char* path) |
| { |
| HMODULE handle; |
| |
| if ( gl_active ) { |
| SDL_SetError("OpenGL context already created"); |
| return -1; |
| } |
| |
| if ( path == NULL ) { |
| path = DEFAULT_GL_DRIVER_PATH; |
| } |
| handle = LoadLibrary(path); |
| if ( handle == NULL ) { |
| SDL_SetError("Could not load OpenGL library"); |
| return -1; |
| } |
| |
| /* Unload the old driver and reset the pointers */ |
| WIN_GL_UnloadLibrary(this); |
| |
| /* Load new function pointers */ |
| SDL_memset(this->gl_data, 0, sizeof(*this->gl_data)); |
| this->gl_data->wglGetProcAddress = (void * (WINAPI *)(const char *)) |
| GetProcAddress(handle, "wglGetProcAddress"); |
| this->gl_data->wglCreateContext = (HGLRC (WINAPI *)(HDC)) |
| GetProcAddress(handle, "wglCreateContext"); |
| this->gl_data->wglDeleteContext = (BOOL (WINAPI *)(HGLRC)) |
| GetProcAddress(handle, "wglDeleteContext"); |
| this->gl_data->wglMakeCurrent = (BOOL (WINAPI *)(HDC, HGLRC)) |
| GetProcAddress(handle, "wglMakeCurrent"); |
| this->gl_data->wglSwapIntervalEXT = (void (WINAPI *)(int)) |
| GetProcAddress(handle, "wglSwapIntervalEXT"); |
| this->gl_data->wglGetSwapIntervalEXT = (int (WINAPI *)(void)) |
| GetProcAddress(handle, "wglGetSwapIntervalEXT"); |
| |
| if ( (this->gl_data->wglGetProcAddress == NULL) || |
| (this->gl_data->wglCreateContext == NULL) || |
| (this->gl_data->wglDeleteContext == NULL) || |
| (this->gl_data->wglMakeCurrent == NULL) ) { |
| SDL_SetError("Could not retrieve OpenGL functions"); |
| FreeLibrary(handle); |
| return -1; |
| } |
| |
| this->gl_config.dll_handle = handle; |
| SDL_strlcpy(this->gl_config.driver_path, path, SDL_arraysize(this->gl_config.driver_path)); |
| this->gl_config.driver_loaded = 1; |
| return 0; |
| } |
| |
| void *WIN_GL_GetProcAddress(_THIS, const char* proc) |
| { |
| void *func; |
| |
| /* This is to pick up extensions */ |
| func = this->gl_data->wglGetProcAddress(proc); |
| if ( ! func ) { |
| /* This is probably a normal GL function */ |
| func = GetProcAddress(this->gl_config.dll_handle, proc); |
| } |
| return func; |
| } |
| |
| #endif /* SDL_VIDEO_OPENGL */ |