RewriteTexelFetchOffset.cpp

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Author : Stuart Morgan
Date : 2019-08-14 12:25:12
Hash : 9d737966
Message : Standardize copyright notices to project style For all "ANGLE Project" copyrights, standardize to the format specified by the style guide. Changes: - "Copyright (c)" and "Copyright(c)" changed to just "Copyright". - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1"). - Fixed a small number of files that had no copyright date using the initial commit year from the version control history. - Fixed one instance of copyright being "The ANGLE Project" rather than "The ANGLE Project Authors" These changes are applied both to the copyright of source file, and where applicable to copyright statements that are generated by templates. BUG=angleproject:3811 Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/compiler/translator/tree_ops/RewriteTexelFetchOffset.cpp

//
// Copyright 2016 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Implementation of texelFetchOffset translation issue workaround.
// See header for more info.

#include "compiler/translator/tree_ops/RewriteTexelFetchOffset.h"

#include "common/angleutils.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/IntermNode_util.h"
#include "compiler/translator/tree_util/IntermTraverse.h"

namespace sh
{

namespace
{

class Traverser : public TIntermTraverser
{
  public:
    static void Apply(TIntermNode *root, const TSymbolTable &symbolTable, int shaderVersion);

  private:
    Traverser(const TSymbolTable &symbolTable, int shaderVersion);
    bool visitAggregate(Visit visit, TIntermAggregate *node) override;
    void nextIteration();

    const TSymbolTable *symbolTable;
    const int shaderVersion;
    bool mFound = false;
};

Traverser::Traverser(const TSymbolTable &symbolTable, int shaderVersion)
    : TIntermTraverser(true, false, false), symbolTable(&symbolTable), shaderVersion(shaderVersion)
{}

// static
void Traverser::Apply(TIntermNode *root, const TSymbolTable &symbolTable, int shaderVersion)
{
    Traverser traverser(symbolTable, shaderVersion);
    do
    {
        traverser.nextIteration();
        root->traverse(&traverser);
        if (traverser.mFound)
        {
            traverser.updateTree();
        }
    } while (traverser.mFound);
}

void Traverser::nextIteration()
{
    mFound = false;
}

bool Traverser::visitAggregate(Visit visit, TIntermAggregate *node)
{
    if (mFound)
    {
        return false;
    }

    // Decide if the node represents the call of texelFetchOffset.
    if (node->getOp() != EOpCallBuiltInFunction)
    {
        return true;
    }

    ASSERT(node->getFunction()->symbolType() == SymbolType::BuiltIn);
    if (node->getFunction()->name() != "texelFetchOffset")
    {
        return true;
    }

    // Potential problem case detected, apply workaround.
    const TIntermSequence *sequence = node->getSequence();
    ASSERT(sequence->size() == 4u);

    // Decide if the sampler is a 2DArray sampler. In that case position is ivec3 and offset is
    // ivec2.
    bool is2DArray = sequence->at(1)->getAsTyped()->getNominalSize() == 3 &&
                     sequence->at(3)->getAsTyped()->getNominalSize() == 2;

    // Create new node that represents the call of function texelFetch.
    // Its argument list will be: texelFetch(sampler, Position+offset, lod).

    TIntermSequence *texelFetchArguments = new TIntermSequence();

    // sampler
    texelFetchArguments->push_back(sequence->at(0));

    // Position
    TIntermTyped *texCoordNode = sequence->at(1)->getAsTyped();
    ASSERT(texCoordNode);

    // offset
    TIntermTyped *offsetNode = nullptr;
    ASSERT(sequence->at(3)->getAsTyped());
    if (is2DArray)
    {
        // For 2DArray samplers, Position is ivec3 and offset is ivec2;
        // So offset must be converted into an ivec3 before being added to Position.
        TIntermSequence *constructOffsetIvecArguments = new TIntermSequence();
        constructOffsetIvecArguments->push_back(sequence->at(3)->getAsTyped());

        TIntermTyped *zeroNode = CreateZeroNode(TType(EbtInt));
        constructOffsetIvecArguments->push_back(zeroNode);

        offsetNode = TIntermAggregate::CreateConstructor(texCoordNode->getType(),
                                                         constructOffsetIvecArguments);
        offsetNode->setLine(texCoordNode->getLine());
    }
    else
    {
        offsetNode = sequence->at(3)->getAsTyped();
    }

    // Position+offset
    TIntermBinary *add = new TIntermBinary(EOpAdd, texCoordNode, offsetNode);
    add->setLine(texCoordNode->getLine());
    texelFetchArguments->push_back(add);

    // lod
    texelFetchArguments->push_back(sequence->at(2));

    ASSERT(texelFetchArguments->size() == 3u);

    TIntermTyped *texelFetchNode = CreateBuiltInFunctionCallNode("texelFetch", texelFetchArguments,
                                                                 *symbolTable, shaderVersion);
    texelFetchNode->setLine(node->getLine());

    // Replace the old node by this new node.
    queueReplacement(texelFetchNode, OriginalNode::IS_DROPPED);
    mFound = true;
    return false;
}

}  // anonymous namespace

void RewriteTexelFetchOffset(TIntermNode *root, const TSymbolTable &symbolTable, int shaderVersion)
{
    // texelFetchOffset is only valid in GLSL 3.0 and later.
    if (shaderVersion < 300)
        return;

    Traverser::Apply(root, symbolTable, shaderVersion);
}

}  // namespace sh

kc3-lang/angle/src/compiler/translator/tree_ops/RewriteTexelFetchOffset.cpp

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kc3-lang/angle /src/compiler/translator/tree_ops/RewriteTexelFetchOffset.cpp