mozgbm.cpp (1657B)
1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim:expandtab:shiftwidth=4:tabstop=4: 3 */ 4 /* This Source Code Form is subject to the terms of the Mozilla Public 5 * License, v. 2.0. If a copy of the MPL was not distributed with this 6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 7 8 #include "prlink.h" 9 10 #include <gbm.h> 11 12 #define GET_FUNC(func, lib) \ 13 func##_fn = \ 14 (decltype(func##_fn))PR_FindFunctionSymbol(lib, #func) \ 15 16 #define IS_FUNC_LOADED(func) \ 17 (func != nullptr) \ 18 19 static struct gbm_device * (*gbm_create_device_fn)(int fd); 20 static void (*gbm_device_destroy_fn)(struct gbm_device* gbm); 21 22 bool IsGBMLibraryLoaded() { 23 static bool isLoaded = 24 (IS_FUNC_LOADED(gbm_create_device_fn) && 25 IS_FUNC_LOADED(gbm_device_destroy_fn)); 26 27 return isLoaded; 28 } 29 30 bool LoadGBMLibrary() { 31 static PRLibrary* gbmLib = nullptr; 32 static bool gbmInitialized = false; 33 34 //TODO Thread safe 35 if (!gbmInitialized) { 36 gbmInitialized = true; 37 gbmLib = PR_LoadLibrary("libgbm.so.1"); 38 if (!gbmLib) { 39 return false; 40 } 41 42 GET_FUNC(gbm_create_device, gbmLib); 43 GET_FUNC(gbm_device_destroy, gbmLib); 44 } 45 46 return IsGBMLibraryLoaded(); 47 } 48 49 struct gbm_device * 50 gbm_create_device(int fd) 51 { 52 if (!LoadGBMLibrary()) { 53 return nullptr; 54 } 55 return gbm_create_device_fn(fd); 56 } 57 58 void 59 gbm_device_destroy(struct gbm_device* gbm) 60 { 61 if (!LoadGBMLibrary()) { 62 return; 63 } 64 return gbm_device_destroy_fn(gbm); 65 }