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>
swap(T & x,T & y)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.
SafePointerFromUInt(unsigned int handle)41 inline void* SafePointerFromUInt(unsigned int handle) {
42     return (void*)(uintptr_t)(handle);
43 }
44 
SafeUIntFromPointer(const void * ptr)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