framework/randomshaders/rsgVariableType.hpp

#ifndef _RSGVARIABLETYPE_HPP
#define _RSGVARIABLETYPE_HPP
/*-------------------------------------------------------------------------
 * drawElements Quality Program Random Shader Generator
 * ----------------------------------------------------
 *
 * Copyright 2014 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.
 *
 *//*!
 * \file
 * \brief Variable Type class.
 *//*--------------------------------------------------------------------*/

#include "rsgDefs.hpp"

#include <vector>
#include <string>

namespace rsg
{

class TokenStream;

class VariableType
{
public:
	enum Type
	{
		TYPE_VOID = 0,
		TYPE_FLOAT,
		TYPE_INT,
		TYPE_BOOL,
		TYPE_STRUCT,
		TYPE_ARRAY,
		TYPE_SAMPLER_2D,
		TYPE_SAMPLER_CUBE,

		TYPE_LAST
	};

	enum Precision
	{
		PRECISION_NONE = 0,
		PRECISION_LOW,
		PRECISION_MEDIUM,
		PRECISION_HIGH,

		PRECISION_LAST
	};

	class Member
	{
	public:
		Member (void)
			: m_type(DE_NULL)
			, m_name()
		{
		}

		Member (const VariableType& type, const char* name)
			: m_type(new VariableType(type))
			, m_name(name)
		{
		}

		~Member (void)
		{
			delete m_type;
		}

		Member (const Member& other)
			: m_type(DE_NULL)
			, m_name(other.m_name)
		{
			if (other.m_type)
				m_type = new VariableType(*other.m_type);
		}

		Member& operator= (const Member& other)
		{
			if (this == &other)
				return *this;

			delete m_type;

			m_type = DE_NULL;
			m_name = other.m_name;

			if (other.m_type)
				m_type = new VariableType(*other.m_type);

			return *this;
		}

		bool operator!= (const Member& other) const
		{
			if (m_name != other.m_name)
				return true;
			if (!!m_type != !!other.m_type)
				return true;
			if (m_type && *m_type != *other.m_type)
				return true;
			return false;
		}

		bool operator== (const Member& other) const
		{
			return !(*this != other);
		}

		const VariableType&		getType		(void) const	{ return *m_type;			}
		const char*				getName		(void) const	{ return m_name.c_str();	}

	private:
		VariableType*			m_type;
		std::string				m_name;
	};

										VariableType		(void);
										VariableType		(Type baseType, int numElements = 0);
										VariableType		(Type baseType, const VariableType& elementType, int numElements);
										VariableType		(Type baseType, const char* typeName);
										~VariableType		(void);

	Type								getBaseType			(void) const	{ return m_baseType;			}
	Precision							getPrecision		(void) const	{ return m_precision;			}
	const char*							getTypeName			(void) const	{ return m_typeName.c_str();	}
	int									getNumElements		(void) const	{ return m_numElements;			}
	const VariableType&					getElementType		(void) const;

	const std::vector<Member>&			getMembers			(void) const	{ return m_members;				}
	std::vector<Member>&				getMembers			(void)			{ return m_members;				}

	int									getScalarSize			(void) const;
	int									getElementScalarOffset	(int elementNdx) const;
	int									getMemberScalarOffset	(int memberNdx) const;

	bool								operator!=			(const VariableType& other) const;
	bool								operator==			(const VariableType& other) const;

	VariableType&						operator=			(const VariableType& other);
										VariableType		(const VariableType& other);

	void								tokenizeShortType	(TokenStream& str) const;

	bool								isStruct			(void) const	{ return m_baseType == TYPE_STRUCT; }
	bool								isArray				(void) const	{ return m_baseType == TYPE_ARRAY;	}
	bool								isFloatOrVec		(void) const	{ return m_baseType == TYPE_FLOAT;	}
	bool								isIntOrVec			(void) const	{ return m_baseType == TYPE_INT;	}
	bool								isBoolOrVec			(void) const	{ return m_baseType == TYPE_BOOL;	}
	bool								isSampler			(void) const	{ return m_baseType == TYPE_SAMPLER_2D || m_baseType == TYPE_SAMPLER_CUBE; }
	bool								isVoid				(void) const	{ return m_baseType == TYPE_VOID;	}

	static const VariableType&			getScalarType		(Type baseType);

private:
	Type								m_baseType;
	Precision							m_precision;
	std::string							m_typeName;
	int									m_numElements;
	VariableType*						m_elementType;
	std::vector<Member>					m_members;
};

inline VariableType::VariableType (void)
	: m_baseType	(TYPE_VOID)
	, m_precision	(PRECISION_NONE)
	, m_typeName	()
	, m_numElements	(0)
	, m_elementType	(DE_NULL)
{
}

inline VariableType::VariableType (Type baseType, int numElements)
	: m_baseType	(baseType)
	, m_precision	(PRECISION_NONE)
	, m_typeName	()
	, m_numElements	(numElements)
	, m_elementType	(DE_NULL)
{
	DE_ASSERT(baseType != TYPE_ARRAY && baseType != TYPE_STRUCT);
}

inline VariableType::VariableType (Type baseType, const VariableType& elementType, int numElements)
	: m_baseType	(baseType)
	, m_precision	(PRECISION_NONE)
	, m_typeName	()
	, m_numElements	(numElements)
	, m_elementType	(new VariableType(elementType))
{
	DE_ASSERT(baseType == TYPE_ARRAY);
}

inline VariableType::VariableType (Type baseType, const char* typeName)
	: m_baseType	(baseType)
	, m_precision	(PRECISION_NONE)
	, m_typeName	(typeName)
	, m_numElements	(0)
	, m_elementType	(DE_NULL)
{
	DE_ASSERT(baseType == TYPE_STRUCT);
}

inline VariableType::~VariableType (void)
{
	delete m_elementType;
}

} // rsg

#endif // _RSGVARIABLETYPE_HPP