framework/randomshaders/rsgFunctionGenerator.cpp

   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 "rsgFunctionGenerator.hpp"
  25 #include "rsgUtils.hpp"
  26
  27 using std::vector;
  28
  29 namespace rsg
  30 {
  31
  32 FunctionGenerator::FunctionGenerator (GeneratorState& state, Function& function)
  33         : m_state               (state)
  34         , m_function    (function)
  35 {
  36 }
  37
  38 FunctionGenerator::~FunctionGenerator (void)
  39 {
  40 }
  41
  42 void FunctionGenerator::generate (void)
  43 {
  44         std::vector<Statement*> statementStack;
  45
  46         // Initialize
  47         m_state.setStatementStack(statementStack);
  48         statementStack.push_back(&m_function.getBody());
  49         m_function.getBody().init(m_state);
  50
  51         // Process until statement stack is empty
  52         while (!statementStack.empty())
  53         {
  54                 DE_ASSERT((int)statementStack.size() <= m_state.getShaderParameters().maxStatementDepth);
  55
  56                 Statement*      curStatement    = statementStack.back();
  57                 Statement*      childStatement  = curStatement->createNextChild(m_state);
  58
  59                 if (childStatement)
  60                         statementStack.push_back(childStatement);
  61                 else
  62                         statementStack.pop_back();
  63         }
  64
  65         // Create assignments if variables have bound value range
  66         for (vector<Variable*>::iterator i = m_requiredAssignments.begin(); i != m_requiredAssignments.end(); i++)
  67         {
  68                 Variable*                               variable                = *i;
  69                 const ValueEntry*               entry                   = m_state.getVariableManager().getValue(variable);
  70                 ValueRange                              valueRange(variable->getType());
  71
  72                 valueRange.getMin() = entry->getValueRange().getMin().value();
  73                 valueRange.getMax() = entry->getValueRange().getMax().value();
  74
  75                 // Remove value entry from this scope. After this entry ptr is invalid.
  76                 m_state.getVariableManager().removeValueFromCurrentScope(variable);
  77
  78                 if (!isUndefinedValueRange(valueRange.asAccess()))
  79                         m_function.getBody().addChild(new AssignStatement(m_state, variable, valueRange.asAccess()));
  80         }
  81 }
  82
  83 } // rsg