/*-------------------------------------------------------------------------
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* drawElements Quality Program Random Shader Generator
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* ----------------------------------------------------
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*
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* Copyright 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*//*!
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* \file
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* \brief Expression generator.
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*//*--------------------------------------------------------------------*/
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#include "rsgExpressionGenerator.hpp"
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namespace rsg
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{
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ExpressionGenerator::ExpressionGenerator (GeneratorState& state)
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: m_state(state)
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{
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}
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ExpressionGenerator::~ExpressionGenerator (void)
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{
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}
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Expression* ExpressionGenerator::generate (const ValueRange& valueRange, int initialDepth)
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{
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// Create root
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m_state.setExpressionDepth(initialDepth);
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Expression* root = Expression::createRandom(m_state, valueRange);
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try
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{
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// Generate full expression
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generate(root);
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}
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catch (const std::exception&)
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{
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delete root;
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m_expressionStack.clear();
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throw;
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}
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return root;
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}
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void ExpressionGenerator::generate (Expression* root)
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{
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DE_ASSERT(m_expressionStack.empty());
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// Initialize stack
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m_expressionStack.push_back(root);
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m_state.setExpressionDepth(m_state.getExpressionDepth()+1);
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// Process until done
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while (!m_expressionStack.empty())
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{
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DE_ASSERT(m_state.getExpressionDepth() <= m_state.getShaderParameters().maxExpressionDepth);
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Expression* curExpr = m_expressionStack[m_expressionStack.size()-1];
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Expression* child = curExpr->createNextChild(m_state);
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if (child)
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{
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m_expressionStack.push_back(child);
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m_state.setExpressionDepth(m_state.getExpressionDepth()+1);
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}
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else
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{
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m_expressionStack.pop_back();
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m_state.setExpressionDepth(m_state.getExpressionDepth()-1);
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}
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}
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}
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} // rsg
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