1 /*------------------------------------------------------------------------- 2 * drawElements Quality Program Random Shader Generator 3 * ---------------------------------------------------- 4 * 5 * Copyright 2014 The Android Open Source Project 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License"); 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 *//*! 20 * \file 21 * \brief Expression generator. 22 *//*--------------------------------------------------------------------*/ 23 24 #include "rsgExpressionGenerator.hpp" 25 26 namespace rsg 27 { 28 ExpressionGenerator(GeneratorState & state)29ExpressionGenerator::ExpressionGenerator(GeneratorState &state) : m_state(state) 30 { 31 } 32 ~ExpressionGenerator(void)33ExpressionGenerator::~ExpressionGenerator(void) 34 { 35 } 36 generate(const ValueRange & valueRange,int initialDepth)37Expression *ExpressionGenerator::generate(const ValueRange &valueRange, int initialDepth) 38 { 39 // Create root 40 m_state.setExpressionDepth(initialDepth); 41 Expression *root = Expression::createRandom(m_state, valueRange); 42 43 try 44 { 45 // Generate full expression 46 generate(root); 47 } 48 catch (const std::exception &) 49 { 50 delete root; 51 m_expressionStack.clear(); 52 throw; 53 } 54 55 return root; 56 } 57 generate(Expression * root)58void ExpressionGenerator::generate(Expression *root) 59 { 60 DE_ASSERT(m_expressionStack.empty()); 61 62 // Initialize stack 63 m_expressionStack.push_back(root); 64 m_state.setExpressionDepth(m_state.getExpressionDepth() + 1); 65 66 // Process until done 67 while (!m_expressionStack.empty()) 68 { 69 DE_ASSERT(m_state.getExpressionDepth() <= m_state.getShaderParameters().maxExpressionDepth); 70 71 Expression *curExpr = m_expressionStack[m_expressionStack.size() - 1]; 72 Expression *child = curExpr->createNextChild(m_state); 73 74 if (child) 75 { 76 m_expressionStack.push_back(child); 77 m_state.setExpressionDepth(m_state.getExpressionDepth() + 1); 78 } 79 else 80 { 81 m_expressionStack.pop_back(); 82 m_state.setExpressionDepth(m_state.getExpressionDepth() - 1); 83 } 84 } 85 } 86 87 } // namespace rsg 88