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/**************************************************************************
*
* 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) {
mtx_unlock(&_eglModuleMutex);
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);
if (disp->Options.ForceSoftware)
_eglLog(_EGL_DEBUG, "Found 'LIBGL_ALWAYS_SOFTWARE' set, will use a CPU renderer");
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;
}
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