framework/randomshaders/rsgStatement.hpp

#ifndef _RSGSTATEMENT_HPP
#define _RSGSTATEMENT_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 Statements.
 *//*--------------------------------------------------------------------*/

#include "rsgDefs.hpp"
#include "rsgGeneratorState.hpp"
#include "rsgVariableManager.hpp"
#include "rsgExpression.hpp"
#include "rsgToken.hpp"

#include <vector>

namespace rsg
{

class Statement
{
public:
								Statement			(void);
	virtual						~Statement			(void);

	virtual Statement*			createNextChild		(GeneratorState& state)							= DE_NULL;
	virtual void				tokenize			(GeneratorState& state, TokenStream& str) const	= DE_NULL;
	virtual void				execute				(ExecutionContext& execCtx) const				= DE_NULL;

protected:
};

// IfStatement
// ForLoopStatement
// WhileStatement
// DoWhileStatement

class ExpressionStatement : public Statement
{
public:
							ExpressionStatement		(GeneratorState& state);
	virtual					~ExpressionStatement	(void);

	Statement*				createNextChild			(GeneratorState& state) { DE_UNREF(state); return DE_NULL; }
	void					tokenize				(GeneratorState& state, TokenStream& str) const;
	void					execute					(ExecutionContext& execCtx) const;

	static float			getWeight				(const GeneratorState& state);

protected:
	Expression*				m_expression;
};

class DeclarationStatement : public Statement
{
public:
							DeclarationStatement	(GeneratorState& state, Variable* variable = DE_NULL);
	virtual					~DeclarationStatement	(void);

	Statement*				createNextChild			(GeneratorState& state) { DE_UNREF(state); return DE_NULL; }
	void					tokenize				(GeneratorState& state, TokenStream& str) const;
	void					execute					(ExecutionContext& execCtx) const;

	static float			getWeight				(const GeneratorState& state);

protected:
	const Variable*			m_variable;
	Expression*				m_expression;
};

class BlockStatement : public Statement
{
public:
							BlockStatement			(GeneratorState& state);
	virtual					~BlockStatement			(void);

							BlockStatement			(void) : m_numChildrenToCreate(0) {}
	void					init					(GeneratorState& state);

	Statement*				createNextChild			(GeneratorState& state);
	void					tokenize				(GeneratorState& state, TokenStream& str) const;
	void					execute					(ExecutionContext& execCtx) const;

	static float			getWeight				(const GeneratorState& state);

	void					addChild				(Statement* statement);

private:
	VariableScope			m_scope;

	int						m_numChildrenToCreate;
	std::vector<Statement*>	m_children;
};

class ConditionalStatement : public Statement
{
public:
							ConditionalStatement	(GeneratorState& state);
	virtual					~ConditionalStatement	(void);

	Statement*				createNextChild			(GeneratorState& state);
	void					tokenize				(GeneratorState& state, TokenStream& str) const;
	void					execute					(ExecutionContext& execCtx) const;

	static float			getWeight				(const GeneratorState& state);

private:
	bool					isElseBlockRequired		(const GeneratorState& state) const;

	Expression*				m_condition;
	Statement*				m_trueStatement;
	Statement*				m_falseStatement;

	ValueScope				m_conditionalScope;
};

// \note Used for generating mandatory assignments (shader outputs, function outputs).
//       Normally assignment is handled inside ExpressionStatement where generator may
//       choose to generate AssignOp expression.
class AssignStatement : public Statement
{
public:
							AssignStatement			(const Variable* variable, Expression* value);
							AssignStatement			(GeneratorState& state, const Variable* variable, ConstValueRangeAccess valueRange);
	virtual					~AssignStatement		(void);

	Statement*				createNextChild			(GeneratorState& state) { DE_UNREF(state); return DE_NULL; }
	void					tokenize				(GeneratorState& state, TokenStream& str) const;
	void					execute					(ExecutionContext& execCtx) const;

private:
	const Variable*			m_variable;
	Expression*				m_valueExpr;
};

} // rsg

#endif // _RSGSTATEMENT_HPP