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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
*/
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/Types.h"
#include "prlink.h"
#include <drm/xf86drm.h>
#define GET_FUNC(func, lib) \
func##_fn = \
(decltype(func##_fn))PR_FindFunctionSymbol(lib, #func) \
#define IS_FUNC_LOADED(func) \
(func != nullptr) \
static int (*drmGetDevices2_fn)(uint32_t flags, drmDevicePtr devices[], int max_devices);
static void (*drmFreeDevices_fn)(drmDevicePtr devices[], int count);
bool IsDRMLibraryLoaded() {
static bool isLoaded =
(IS_FUNC_LOADED(drmGetDevices2_fn) &&
IS_FUNC_LOADED(drmFreeDevices_fn));
return isLoaded;
}
bool LoadDRMLibrary() {
static PRLibrary* drmLib = nullptr;
static bool drmInitialized = false;
//TODO Thread safe
if (!drmInitialized) {
drmInitialized = true;
drmLib = PR_LoadLibrary("libdrm.so.2");
if (!drmLib) {
return false;
}
GET_FUNC(drmGetDevices2, drmLib);
GET_FUNC(drmFreeDevices, drmLib);
}
return IsDRMLibraryLoaded();
}
int
drmGetDevices2(uint32_t flags, drmDevicePtr devices[], int max_devices)
{
if (!LoadDRMLibrary()) {
return 0;
}
return drmGetDevices2_fn(flags, devices, max_devices);
}
void
drmFreeDevices(drmDevicePtr devices[], int count)
{
if (!LoadDRMLibrary()) {
return;
}
return drmFreeDevices_fn(devices, count);
}
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