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