1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #ifndef GL_UTILS_H 17 #define GL_UTILS_H 18 19 #include <assert.h> 20 #include <inttypes.h> 21 22 typedef enum { 23 GLES_1_1 = 1, 24 GLES_2_0 = 2, 25 MAX_GLES_VERSION //Must be last 26 } GLESVersion; 27 28 template <class T> 29 void swap(T& x,T& y) { 30 T temp; 31 temp = x; 32 x = y; 33 y = temp; 34 } 35 36 bool isPowerOf2(int num); 37 38 // <EGL/egl.h> defines many types as 'void*' while they're really 39 // implemented as unsigned integers. These convenience template functions 40 // help casting between them safely without generating compiler warnings. 41 inline void* SafePointerFromUInt(unsigned int handle) { 42 return (void*)(uintptr_t)(handle); 43 } 44 45 inline unsigned int SafeUIntFromPointer(const void* ptr) { 46 // Assertion error if the pointer contains a value that does not fit 47 // in an unsigned integer! 48 assert((uintptr_t)(ptr) == (unsigned int)(uintptr_t)(ptr)); 49 return (unsigned int)(uintptr_t)(ptr); 50 } 51 52 #endif 53
