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 29 ExpressionGenerator::ExpressionGenerator (GeneratorState& state) 30 : m_state(state) 31 { 32 } 33 34 ExpressionGenerator::~ExpressionGenerator (void) 35 { 36 } 37 38 Expression* ExpressionGenerator::generate (const ValueRange& valueRange, int initialDepth) 39 { 40 // Create root 41 m_state.setExpressionDepth(initialDepth); 42 Expression* root = Expression::createRandom(m_state, valueRange); 43 44 try 45 { 46 // Generate full expression 47 generate(root); 48 } 49 catch (const std::exception&) 50 { 51 delete root; 52 m_expressionStack.clear(); 53 throw; 54 } 55 56 return root; 57 } 58 59 void ExpressionGenerator::generate (Expression* root) 60 { 61 DE_ASSERT(m_expressionStack.empty()); 62 63 // Initialize stack 64 m_expressionStack.push_back(root); 65 m_state.setExpressionDepth(m_state.getExpressionDepth()+1); 66 67 // Process until done 68 while (!m_expressionStack.empty()) 69 { 70 DE_ASSERT(m_state.getExpressionDepth() <= m_state.getShaderParameters().maxExpressionDepth); 71 72 Expression* curExpr = m_expressionStack[m_expressionStack.size()-1]; 73 Expression* child = curExpr->createNextChild(m_state); 74 75 if (child) 76 { 77 m_expressionStack.push_back(child); 78 m_state.setExpressionDepth(m_state.getExpressionDepth()+1); 79 } 80 else 81 { 82 m_expressionStack.pop_back(); 83 m_state.setExpressionDepth(m_state.getExpressionDepth()-1); 84 } 85 } 86 } 87 88 } // rsg 89
