void GetVariableTraverser::traverse(const TType &type, const TString &name, std::vector<VarT> *output)
{
const TStructure *structure = type.getStruct();
VarT variable;
variable.name = name.c_str();
variable.arraySize = static_cast<unsigned int>(type.getArraySize());
if (!structure)
{
variable.type = GLVariableType(type);
variable.precision = GLVariablePrecision(type);
}
else
{
// Note: this enum value is not exposed outside ANGLE
variable.type = GL_STRUCT_ANGLEX;
variable.structName = structure->name().c_str();
const TFieldList &fields = structure->fields();
for (size_t fieldIndex = 0; fieldIndex < fields.size(); fieldIndex++)
{
TField *field = fields[fieldIndex];
traverse(*field->type(), field->name(), &variable.fields);
}
}
visitVariable(&variable);
ASSERT(output);
output->push_back(variable);
}
TString Std140PaddingHelper::postPaddingString(const TType &type, bool useHLSLRowMajorPacking)
{
if (!type.isMatrix() && !type.isArray() && type.getBasicType() != EbtStruct)
{
return "";
}
int numComponents = 0;
TStructure *structure = type.getStruct();
if (type.isMatrix())
{
// This method can also be called from structureString, which does not use layout qualifiers.
// Thus, use the method parameter for determining the matrix packing.
//
// Note HLSL row major packing corresponds to GL API column-major, and vice-versa, since we
// wish to always transpose GL matrices to play well with HLSL's matrix array indexing.
//
const bool isRowMajorMatrix = !useHLSLRowMajorPacking;
const GLenum glType = GLVariableType(type);
numComponents = gl::MatrixComponentCount(glType, isRowMajorMatrix);
}
else if (structure)
{
const TString &structName = QualifiedStructNameString(*structure,
useHLSLRowMajorPacking, true);
numComponents = mStructElementIndexes->find(structName)->second;
if (numComponents == 0)
{
return "";
}
}
else
{
const GLenum glType = GLVariableType(type);
numComponents = gl::VariableComponentCount(glType);
}
TString padding;
for (int paddingOffset = numComponents; paddingOffset < 4; paddingOffset++)
{
padding += " float pad_" + next() + ";\n";
}
return padding;
}
void CollectVariables::visitVariable(const TIntermSymbol *variable,
std::vector<Attribute> *infoList) const
{
ASSERT(variable);
const TType &type = variable->getType();
ASSERT(!type.getStruct());
Attribute attribute;
attribute.type = GLVariableType(type);
attribute.precision = GLVariablePrecision(type);
attribute.name = variable->getSymbol().c_str();
attribute.arraySize = static_cast<unsigned int>(type.getArraySize());
attribute.mappedName = TIntermTraverser::hash(variable->getSymbol(), mHashFunction).c_str();
attribute.location = variable->getType().getLayoutQualifier().location;
infoList->push_back(attribute);
}
int Std140PaddingHelper::prePadding(const TType &type)
{
if (type.getBasicType() == EbtStruct || type.isMatrix() || type.isArray())
{
// no padding needed, HLSL will align the field to a new register
mElementIndex = 0;
return 0;
}
const GLenum glType = GLVariableType(type);
const int numComponents = gl::VariableComponentCount(glType);
if (numComponents >= 4)
{
// no padding needed, HLSL will align the field to a new register
mElementIndex = 0;
return 0;
}
if (mElementIndex + numComponents > 4)
{
// no padding needed, HLSL will align the field to a new register
mElementIndex = numComponents;
return 0;
}
const int alignment = numComponents == 3 ? 4 : numComponents;
const int paddingOffset = (mElementIndex % alignment);
const int paddingCount = (paddingOffset != 0 ? (alignment - paddingOffset) : 0);
mElementIndex += paddingCount;
mElementIndex += numComponents;
mElementIndex %= 4;
return paddingCount;
}
