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// Copyright (c) 2011 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 <string>
#include "../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) {
if (b == 0) {
*dst = 0;
return true;
}
T v = a * b;
if (v / b != a) {
*dst = 0;
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) {
if (a + b < a) {
*dst = 0;
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:
static const int kNumFaces = 6;
struct EnumToString {
uint32 value;
const char* name;
};
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);
static uint32 IndexToGLFaceTarget(int index);
// Returns a bitmask for the channels the given format supports where
// 0x1 is red
// 0x2 is green
// 0x4 is blue
// 0x8 is alpha
static uint32 GetChannelsForFormat(int format);
static bool IsNPOT(uint32 value) {
return value > 0 && (value & (value - 1)) != 0;
}
static std::string GetStringEnum(uint32 value);
static std::string GetStringBool(uint32 value);
static std::string GetStringError(uint32 value);
#include "../common/gles2_cmd_utils_autogen.h"
private:
static std::string GetQualifiedEnumString(
const EnumToString* table, size_t count, uint32 value);
static const EnumToString* enum_to_string_table_;
static const size_t enum_to_string_table_len_;
int num_compressed_texture_formats_;
};
} // namespace gles2
} // namespace gpu
#endif // GPU_COMMAND_BUFFER_COMMON_GLES2_CMD_UTILS_H_
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