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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file is here so other GLES2 related files can have a common set of
// includes where appropriate.
#ifndef GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
#define GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
#include "base/basictypes.h"
#include "gpu/command_buffer/common/types.h"
namespace gpu {
namespace gles2 {
// Does a multiply and checks for overflow. If the multiply did not overflow
// returns true.
template <typename T>
inline bool SafeMultiply(T a, T b, T* dst) {
*dst = 0;
if (b == 0) {
return true;
}
T v = a * b;
if (v / b != a) {
return false;
}
*dst = v;
return true;
}
// A wrapper for SafeMultiply to remove the need to cast.
inline bool SafeMultiplyUint32(uint32 a, uint32 b, uint32* dst) {
return SafeMultiply(a, b, dst);
}
// Does an add checking for overflow. If there was no overflow returns true.
template <typename T>
inline bool SafeAdd(T a, T b, T* dst) {
*dst = 0;
if (a + b < a) {
return false;
}
*dst = a + b;
return true;
}
// A wrapper for SafeAdd to remove the need to cast.
inline bool SafeAddUint32(uint32 a, uint32 b, uint32* dst) {
return SafeAdd(a, b, dst);
}
// Utilties for GLES2 support.
class GLES2Util {
public:
explicit GLES2Util(
int num_compressed_texture_formats)
: num_compressed_texture_formats_(num_compressed_texture_formats) {
}
// Gets the number of values a particular id will return when a glGet
// function is called. If 0 is returned the id is invalid.
int GLGetNumValuesReturned(int id) const;
// Computes the size of image data for TexImage2D and TexSubImage2D.
static bool ComputeImageDataSize(
int width, int height, int format, int type, int unpack_alignment,
uint32* size);
static uint32 GetGLDataTypeSizeForUniforms(int type);
static size_t GetGLTypeSizeForTexturesAndBuffers(uint32 type);
static uint32 GLErrorToErrorBit(uint32 gl_error);
static uint32 GLErrorBitToGLError(uint32 error_bit);
private:
int num_compressed_texture_formats_;
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
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