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/*
* Copyright 2019-2021 Diligent Graphics LLC
* Copyright 2015-2019 Egor Yusov
*
* 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.
*
* In no event and under no legal theory, whether in tort (including negligence),
* contract, or otherwise, unless required by applicable law (such as deliberate
* and grossly negligent acts) or agreed to in writing, shall any Contributor be
* liable for any damages, including any direct, indirect, special, incidental,
* or consequential damages of any character arising as a result of this License or
* out of the use or inability to use the software (including but not limited to damages
* for loss of goodwill, work stoppage, computer failure or malfunction, or any and
* all other commercial damages or losses), even if such Contributor has been advised
* of the possibility of such damages.
*/
//--------------------------------------------------------------------------------------
// Copyright 2013 Intel Corporation
// All Rights Reserved
//
// Permission is granted to use, copy, distribute and prepare derivative works of this
// software for any purpose and without fee, provided, that the above copyright notice
// and this statement appear in all copies. Intel makes no representations about the
// suitability of this software for any purpose. THIS SOFTWARE IS PROVIDED "AS IS."
// INTEL SPECIFICALLY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, AND ALL LIABILITY,
// INCLUDING CONSEQUENTIAL AND OTHER INDIRECT DAMAGES, FOR THE USE OF THIS SOFTWARE,
// INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, AND INCLUDING THE
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Intel does not
// assume any responsibility for any errors which may appear in this software nor any
// responsibility to update it.
//--------------------------------------------------------------------------------------
#pragma once
#include <set>
#include <vector>
#include <sstream>
#include <iomanip>
#include "../../GraphicsEngine/interface/Shader.h"
#include "../../../Platforms/Basic/interface/DebugUtilities.hpp"
namespace Diligent
{
class ShaderMacroHelper
{
public:
template <typename DefintionType>
void AddShaderMacro(const Char* Name, DefintionType Definition)
{
#if DILIGENT_DEBUG
for (size_t i = 0; i < m_Macros.size() && m_Macros[i].Definition != nullptr; ++i)
{
if (strcmp(m_Macros[i].Name, Name) == 0)
{
UNEXPECTED("Macro '", Name, "' already exists. Use UpdateMacro() to update the macro value.");
}
}
#endif
std::ostringstream ss;
ss << Definition;
AddShaderMacro<const Char*>(Name, ss.str().c_str());
}
ShaderMacroHelper() = default;
// NB: string pointers in m_Macros may become invalid after the
// copy or move due to short string optimization in std::string
ShaderMacroHelper(const ShaderMacroHelper&) = delete;
ShaderMacroHelper(ShaderMacroHelper&&) = delete;
ShaderMacroHelper& operator=(const ShaderMacroHelper&) = delete;
ShaderMacroHelper& operator=(ShaderMacroHelper&&) = delete;
void Finalize()
{
if (!m_bIsFinalized)
{
m_Macros.emplace_back(nullptr, nullptr);
m_bIsFinalized = true;
}
}
void Reopen()
{
if (m_bIsFinalized)
{
VERIFY_EXPR(m_Macros.size() > 0 && m_Macros.back().Name == nullptr && m_Macros.back().Definition == nullptr);
m_Macros.pop_back();
m_bIsFinalized = false;
}
}
void Clear()
{
m_Macros.clear();
m_StringPool.clear();
m_bIsFinalized = false;
}
operator const ShaderMacro*()
{
if (m_Macros.size() > 0 && !m_bIsFinalized)
Finalize();
return m_Macros.size() ? m_Macros.data() : nullptr;
}
void RemoveMacro(const Char* Name)
{
size_t i = 0;
while (i < m_Macros.size() && m_Macros[i].Definition != nullptr)
{
if (strcmp(m_Macros[i].Name, Name) == 0)
{
m_Macros.erase(m_Macros.begin() + i);
break;
}
else
{
++i;
}
}
}
template <typename DefintionType>
void UpdateMacro(const Char* Name, DefintionType Definition)
{
RemoveMacro(Name);
AddShaderMacro(Name, Definition);
}
private:
std::vector<ShaderMacro> m_Macros;
std::set<std::string> m_StringPool;
bool m_bIsFinalized = false;
};
template <>
inline void ShaderMacroHelper::AddShaderMacro(const Char* Name, const Char* Definition)
{
Reopen();
const auto* PooledDefinition = m_StringPool.insert(Definition).first->c_str();
const auto* PooledName = m_StringPool.insert(Name).first->c_str();
m_Macros.emplace_back(PooledName, PooledDefinition);
}
template <>
inline void ShaderMacroHelper::AddShaderMacro(const Char* Name, bool Definition)
{
AddShaderMacro<const Char*>(Name, Definition ? "1" : "0");
}
template <>
inline void ShaderMacroHelper::AddShaderMacro(const Char* Name, float Definition)
{
std::ostringstream ss;
// Make sure that when floating point represents integer, it is still
// written as float: 1024.0, but not 1024. This is essnetial to
// avoid type conversion issues in GLES.
if (Definition == static_cast<float>(static_cast<int>(Definition)))
ss << std::fixed << std::setprecision(1);
ss << Definition;
AddShaderMacro<const Char*>(Name, ss.str().c_str());
}
template <>
inline void ShaderMacroHelper::AddShaderMacro(const Char* Name, Uint32 Definition)
{
// Make sure that uint constants have the 'u' suffix to avoid problems in GLES.
std::ostringstream ss;
ss << Definition << 'u';
AddShaderMacro<const Char*>(Name, ss.str().c_str());
}
template <>
inline void ShaderMacroHelper::AddShaderMacro(const Char* Name, Uint8 Definition)
{
AddShaderMacro(Name, Uint32{Definition});
}
#define ADD_SHADER_MACRO_ENUM_VALUE(Helper, EnumValue) Helper.AddShaderMacro(#EnumValue, static_cast<int>(EnumValue));
} // namespace Diligent
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