1//
2// Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.
3// Use of this source code is governed by a BSD-style license that can be
4// found in the LICENSE file.
5//
6// UnfoldSelect is an AST traverser to output the select operator ?: as if-else statements
7//
8
9#include "compiler/UnfoldSelect.h"
10
11#include "compiler/InfoSink.h"
12#include "compiler/OutputHLSL.h"
13
14namespace sh
15{
16UnfoldSelect::UnfoldSelect(TParseContext &context, OutputHLSL *outputHLSL) : mContext(context), mOutputHLSL(outputHLSL)
17{
18    mTemporaryIndex = 0;
19}
20
21void UnfoldSelect::traverse(TIntermNode *node)
22{
23    mTemporaryIndex++;
24    node->traverse(this);
25}
26
27bool UnfoldSelect::visitSelection(Visit visit, TIntermSelection *node)
28{
29    TInfoSinkBase &out = mOutputHLSL->getBodyStream();
30
31    if (node->usesTernaryOperator())
32    {
33        int i = mTemporaryIndex++;
34
35        out << mOutputHLSL->typeString(node->getType()) << " t" << i << ";\n";
36
37        node->getCondition()->traverse(this);
38        out << "if(";
39        node->getCondition()->traverse(mOutputHLSL);
40        out << ")\n"
41               "{\n";
42        node->getTrueBlock()->traverse(this);
43        out << "    t" << i << " = ";
44        node->getTrueBlock()->traverse(mOutputHLSL);
45        out << ";\n"
46               "}\n"
47               "else\n"
48               "{\n";
49        node->getFalseBlock()->traverse(this);
50        out << "    t" << i << " = ";
51        node->getFalseBlock()->traverse(mOutputHLSL);
52        out << ";\n"
53               "}\n";
54
55        mTemporaryIndex--;
56    }
57
58    return false;
59}
60
61int UnfoldSelect::getTemporaryIndex()
62{
63    return mTemporaryIndex;
64}
65}
66