| /************************************************************************** |
| * |
| * Copyright 2008 VMware, Inc. |
| * Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com> |
| * Copyright 2010-2011 LunarG, Inc. |
| * All Rights Reserved. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the |
| * "Software"), to deal in the Software without restriction, including |
| * without limitation the rights to use, copy, modify, merge, publish, |
| * distribute, sub license, and/or sell copies of the Software, and to |
| * permit persons to whom the Software is furnished to do so, subject to |
| * the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the |
| * next paragraph) shall be included in all copies or substantial portions |
| * of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| * DEALINGS IN THE SOFTWARE. |
| * |
| **************************************************************************/ |
| |
| |
| /** |
| * Functions for choosing and opening/loading device drivers. |
| */ |
| |
| |
| #include <assert.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include "c11/threads.h" |
| |
| #include "egldefines.h" |
| #include "egldisplay.h" |
| #include "egldriver.h" |
| #include "egllog.h" |
| |
| #include "util/debug.h" |
| |
| static mtx_t _eglModuleMutex = _MTX_INITIALIZER_NP; |
| static _EGLDriver *_eglDriver; |
| |
| static _EGLDriver * |
| _eglGetDriver(void) |
| { |
| mtx_lock(&_eglModuleMutex); |
| |
| if (!_eglDriver) { |
| _eglDriver = calloc(1, sizeof(*_eglDriver)); |
| if (!_eglDriver) |
| return NULL; |
| _eglInitDriver(_eglDriver); |
| } |
| |
| mtx_unlock(&_eglModuleMutex); |
| |
| return _eglDriver; |
| } |
| |
| static _EGLDriver * |
| _eglMatchAndInitialize(_EGLDisplay *disp) |
| { |
| if (_eglGetDriver()) |
| if (_eglDriver->API.Initialize(_eglDriver, disp)) |
| return _eglDriver; |
| |
| return NULL; |
| } |
| |
| /** |
| * Match a display to a driver. The matching is done by finding the first |
| * driver that can initialize the display. |
| */ |
| _EGLDriver * |
| _eglMatchDriver(_EGLDisplay *disp) |
| { |
| _EGLDriver *best_drv; |
| |
| assert(!disp->Initialized); |
| |
| /* set options */ |
| disp->Options.ForceSoftware = |
| env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false); |
| |
| best_drv = _eglMatchAndInitialize(disp); |
| if (!best_drv && !disp->Options.ForceSoftware) { |
| disp->Options.ForceSoftware = EGL_TRUE; |
| best_drv = _eglMatchAndInitialize(disp); |
| } |
| |
| if (best_drv) { |
| disp->Driver = best_drv; |
| disp->Initialized = EGL_TRUE; |
| } |
| |
| return best_drv; |
| } |
| |
| __eglMustCastToProperFunctionPointerType |
| _eglGetDriverProc(const char *procname) |
| { |
| if (_eglGetDriver() && _eglDriver->API.GetProcAddress) |
| return _eglDriver->API.GetProcAddress(_eglDriver, procname); |
| |
| return NULL; |
| } |
| |
| /** |
| * Unload all drivers. |
| */ |
| void |
| _eglUnloadDrivers(void) |
| { |
| /* this is called at atexit time */ |
| free(_eglDriver); |
| _eglDriver = NULL; |
| } |