/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef GL_UTILS_H
#define GL_UTILS_H

#include <assert.h>
#include <inttypes.h>

typedef enum {
    GLES_1_1 = 1,
    GLES_2_0 = 2,
    MAX_GLES_VERSION //Must be last
} GLESVersion;

template <class T>
void swap(T& x,T& y) {
     T temp;
     temp = x;
     x = y;
     y = temp;
}

bool isPowerOf2(int num);

// <EGL/egl.h> defines many types as 'void*' while they're really
// implemented as unsigned integers. These convenience template functions
// help casting between them safely without generating compiler warnings.
inline void* SafePointerFromUInt(unsigned int handle) {
    return (void*)(uintptr_t)(handle);
}

inline unsigned int SafeUIntFromPointer(const void* ptr) {
    // Assertion error if the pointer contains a value that does not fit
    // in an unsigned integer!
    assert((uintptr_t)(ptr) == (unsigned int)(uintptr_t)(ptr));
    return (unsigned int)(uintptr_t)(ptr);
}

#endif