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// metal-vertex-layout.cpp
#include "metal-vertex-layout.h"
#include "metal-util.h"
namespace gfx
{
using namespace Slang;
namespace metal
{
Result InputLayoutImpl::init(const IInputLayout::Desc& desc)
{
for (Index i = 0; i < desc.inputElementCount; i++)
{
if (MetalUtil::translateVertexFormat(desc.inputElements[i].format) ==
MTL::VertexFormatInvalid)
{
return SLANG_E_INVALID_ARG;
}
m_inputElements.add(desc.inputElements[i]);
}
for (Index i = 0; i < desc.vertexStreamCount; i++)
{
m_vertexStreams.add(desc.vertexStreams[i]);
}
return SLANG_OK;
}
NS::SharedPtr<MTL::VertexDescriptor> InputLayoutImpl::createVertexDescriptor(
NS::UInteger vertexBufferIndexOffset)
{
NS::SharedPtr<MTL::VertexDescriptor> vertexDescriptor =
NS::TransferPtr(MTL::VertexDescriptor::alloc()->init());
for (Index i = 0; i < m_inputElements.getCount(); i++)
{
const auto& inputElement = m_inputElements[i];
MTL::VertexAttributeDescriptor* desc = vertexDescriptor->attributes()->object(i);
desc->setOffset(inputElement.offset);
desc->setBufferIndex(inputElement.bufferSlotIndex + vertexBufferIndexOffset);
MTL::VertexFormat metalFormat = MetalUtil::translateVertexFormat(inputElement.format);
desc->setFormat(metalFormat);
}
for (Index i = 0; i < m_vertexStreams.getCount(); i++)
{
const auto& vertexStream = m_vertexStreams[i];
MTL::VertexBufferLayoutDescriptor* desc =
vertexDescriptor->layouts()->object(i + vertexBufferIndexOffset);
desc->setStepFunction(MetalUtil::translateVertexStepFunction(vertexStream.slotClass));
desc->setStepRate(
vertexStream.slotClass == InputSlotClass::PerVertex
? 1
: vertexStream.instanceDataStepRate);
desc->setStride(vertexStream.stride);
}
return vertexDescriptor;
}
} // namespace metal
} // namespace gfx
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