e5a7ef0013
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com> Reviewed-by: Emil Velikov <emil.velikov@collabora.com> Reported-by: Brendan King <Brendan.King@imgtec.com>
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/**************************************************************************
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*
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* Copyright 2008 VMware, Inc.
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* Copyright 2009-2010 Chia-I Wu <olvaffe@gmail.com>
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* Copyright 2010-2011 LunarG, Inc.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* Functions for choosing and opening/loading device drivers.
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*/
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#include <assert.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "c11/threads.h"
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#include "egldefines.h"
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#include "egldisplay.h"
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#include "egldriver.h"
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#include "egllog.h"
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#include "util/debug.h"
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static mtx_t _eglModuleMutex = _MTX_INITIALIZER_NP;
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static _EGLDriver *_eglDriver;
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static _EGLDriver *
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_eglGetDriver(void)
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{
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mtx_lock(&_eglModuleMutex);
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if (!_eglDriver)
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_eglDriver = _eglBuiltInDriver();
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mtx_unlock(&_eglModuleMutex);
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return _eglDriver;
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}
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static _EGLDriver *
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_eglMatchAndInitialize(_EGLDisplay *dpy)
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{
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if (_eglGetDriver())
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if (_eglDriver->API.Initialize(_eglDriver, dpy))
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return _eglDriver;
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return NULL;
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}
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/**
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* Match a display to a driver. The matching is done by finding the first
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* driver that can initialize the display.
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*/
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_EGLDriver *
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_eglMatchDriver(_EGLDisplay *dpy)
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{
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_EGLDriver *best_drv;
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assert(!dpy->Initialized);
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/* set options */
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dpy->Options.ForceSoftware =
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env_var_as_boolean("LIBGL_ALWAYS_SOFTWARE", false);
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best_drv = _eglMatchAndInitialize(dpy);
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if (!best_drv && !dpy->Options.ForceSoftware) {
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dpy->Options.ForceSoftware = EGL_TRUE;
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best_drv = _eglMatchAndInitialize(dpy);
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}
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if (best_drv) {
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_eglLog(_EGL_DEBUG, "the best driver is %s",
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best_drv->Name);
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dpy->Driver = best_drv;
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dpy->Initialized = EGL_TRUE;
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}
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return best_drv;
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}
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__eglMustCastToProperFunctionPointerType
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_eglGetDriverProc(const char *procname)
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{
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if (_eglGetDriver())
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return _eglDriver->API.GetProcAddress(_eglDriver, procname);
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return NULL;
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}
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/**
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* Unload all drivers.
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*/
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void
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_eglUnloadDrivers(void)
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{
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/* this is called at atexit time */
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free(_eglDriver);
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_eglDriver = NULL;
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}
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