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//
// Copyright 2020 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.
//
// The ValidateClipCullDistance function checks if the sum of array sizes for gl_ClipDistance and
// gl_CullDistance exceeds gl_MaxCombinedClipAndCullDistances
//
#include "ValidateClipCullDistance.h"
#include "compiler/translator/Diagnostics.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
#include "compiler/translator/util.h"
namespace sh
{
namespace
{
void error(const TIntermSymbol &symbol, const char *reason, TDiagnostics *diagnostics)
{
diagnostics->error(symbol.getLine(), reason, symbol.getName().data());
}
class ValidateClipCullDistanceTraverser : public TIntermTraverser
{
public:
ValidateClipCullDistanceTraverser();
void validate(TDiagnostics *diagnostics, const unsigned int maxCombinedClipAndCullDistances);
private:
bool visitDeclaration(Visit visit, TIntermDeclaration *node) override;
bool visitBinary(Visit visit, TIntermBinary *node) override;
unsigned int mClipDistanceSize;
unsigned int mCullDistanceSize;
unsigned int mMaxClipDistanceIndex;
unsigned int mMaxCullDistanceIndex;
const TIntermSymbol *mClipDistance;
const TIntermSymbol *mCullDistance;
};
ValidateClipCullDistanceTraverser::ValidateClipCullDistanceTraverser()
: TIntermTraverser(true, false, false),
mClipDistanceSize(0),
mCullDistanceSize(0),
mMaxClipDistanceIndex(0),
mMaxCullDistanceIndex(0),
mClipDistance(nullptr),
mCullDistance(nullptr)
{}
bool ValidateClipCullDistanceTraverser::visitDeclaration(Visit visit, TIntermDeclaration *node)
{
const TIntermSequence &sequence = *(node->getSequence());
if (sequence.size() != 1)
{
return true;
}
const TIntermSymbol *symbol = sequence.front()->getAsSymbolNode();
if (symbol == nullptr)
{
return true;
}
if (symbol->getName() == "gl_ClipDistance")
{
mClipDistanceSize = symbol->getOutermostArraySize();
mClipDistance = symbol;
}
else if (symbol->getName() == "gl_CullDistance")
{
mCullDistanceSize = symbol->getOutermostArraySize();
mCullDistance = symbol;
}
return true;
}
bool ValidateClipCullDistanceTraverser::visitBinary(Visit visit, TIntermBinary *node)
{
TOperator op = node->getOp();
if (op != EOpIndexDirect && op != EOpIndexIndirect)
{
return true;
}
TIntermSymbol *left = node->getLeft()->getAsSymbolNode();
if (!left)
{
return true;
}
ImmutableString varName(left->getName());
if (varName != "gl_ClipDistance" && varName != "gl_CullDistance")
{
return true;
}
const TConstantUnion *constIdx = node->getRight()->getConstantValue();
if (constIdx)
{
unsigned int idx = 0;
switch (constIdx->getType())
{
case EbtInt:
idx = constIdx->getIConst();
break;
case EbtUInt:
idx = constIdx->getUConst();
break;
case EbtFloat:
idx = static_cast<unsigned int>(constIdx->getFConst());
break;
case EbtBool:
idx = constIdx->getBConst() ? 1 : 0;
break;
default:
UNREACHABLE();
break;
}
if (varName == "gl_ClipDistance")
{
if (idx > mMaxClipDistanceIndex)
{
mMaxClipDistanceIndex = idx;
if (!mClipDistance)
{
mClipDistance = left;
}
}
}
else
{
ASSERT(varName == "gl_CullDistance");
if (idx > mMaxCullDistanceIndex)
{
mMaxCullDistanceIndex = idx;
if (!mCullDistance)
{
mCullDistance = left;
}
}
}
}
return true;
}
void ValidateClipCullDistanceTraverser::validate(TDiagnostics *diagnostics,
const unsigned int maxCombinedClipAndCullDistances)
{
ASSERT(diagnostics);
unsigned int enabledClipDistances =
(mClipDistanceSize > 0 ? mClipDistanceSize
: (mClipDistance ? mMaxClipDistanceIndex + 1 : 0));
unsigned int enabledCullDistances =
(mCullDistanceSize > 0 ? mCullDistanceSize
: (mCullDistance ? mMaxCullDistanceIndex + 1 : 0));
unsigned int combinedClipAndCullDistances =
(enabledClipDistances > 0 && enabledCullDistances > 0
? enabledClipDistances + enabledCullDistances
: 0);
if (combinedClipAndCullDistances > maxCombinedClipAndCullDistances)
{
const TIntermSymbol *greaterSymbol =
(enabledClipDistances >= enabledCullDistances ? mClipDistance : mCullDistance);
std::stringstream strstr = sh::InitializeStream<std::stringstream>();
strstr << "The sum of 'gl_ClipDistance' and 'gl_CullDistance' size is greater than "
"gl_MaxCombinedClipAndCullDistances ("
<< combinedClipAndCullDistances << " > " << maxCombinedClipAndCullDistances << ")";
error(*greaterSymbol, strstr.str().c_str(), diagnostics);
}
}
} // anonymous namespace
bool ValidateClipCullDistance(TIntermBlock *root,
TDiagnostics *diagnostics,
const unsigned int maxCombinedClipAndCullDistances)
{
ValidateClipCullDistanceTraverser varyingValidator;
root->traverse(&varyingValidator);
int numErrorsBefore = diagnostics->numErrors();
varyingValidator.validate(diagnostics, maxCombinedClipAndCullDistances);
return (diagnostics->numErrors() == numErrorsBefore);
}
} // namespace sh
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