[DX12] Upload texture.

upload_texture.cpp

void afWriteTexture(ComPtr<ID3D12Resource> tex, const TexDesc& desc, int mipCount, const AFTexSubresourceData datas[])
{
	const int maxSubresources = 100;
	const UINT subResources = mipCount * desc.arraySize;
	assert(subResources <= maxSubresources);
	D3D12_PLACED_SUBRESOURCE_FOOTPRINT footprints[maxSubresources];
	UINT64 rowSizeInBytes[maxSubresources], uploadSize;
	UINT numRows[maxSubresources];
	D3D12_RESOURCE_BARRIER transitions1[maxSubresources], transitions2[maxSubresources];
	deviceMan.GetDevice()->GetCopyableFootprints(&tex->GetDesc(), 0, subResources, 0, footprints, numRows, rowSizeInBytes, &uploadSize);
	ComPtr<ID3D12Resource> uploadBuf = afCreateBuffer((int)uploadSize);
	assert(uploadBuf);
	uploadBuf->SetName(__FUNCTIONW__ L" intermediate buffer");
	D3D12_RANGE readRange = {};
	BYTE* ptr;
	HRESULT hr = uploadBuf->Map(0, &readRange, (void**)&ptr);
	assert(ptr);
	for (UINT i = 0; i < subResources; i++)
	{
		transitions1[i] = { D3D12_RESOURCE_BARRIER_TYPE_TRANSITION, D3D12_RESOURCE_BARRIER_FLAG_NONE,{ tex.Get(), i, D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE, D3D12_RESOURCE_STATE_COPY_DEST } };
		transitions2[i] = { D3D12_RESOURCE_BARRIER_TYPE_TRANSITION, D3D12_RESOURCE_BARRIER_FLAG_NONE,{ tex.Get(), i, D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE } };
	}
	ID3D12GraphicsCommandList* list = deviceMan.GetCommandList();
	list->ResourceBarrier(subResources, transitions1);
	for (UINT i = 0; i < subResources; i++)
	{
		assert(datas[i].pitch == rowSizeInBytes[i]);
		assert(datas[i].pitch <= footprints[i].Footprint.RowPitch);
		for (UINT row = 0; row < numRows[i]; row++) {
			memcpy(ptr + footprints[i].Offset + footprints[i].Footprint.RowPitch * row, (BYTE*)datas[i].ptr + datas[i].pitch * row, datas[i].pitch);
		}
		D3D12_TEXTURE_COPY_LOCATION uploadBufLocation = { uploadBuf.Get(), D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT, footprints[i] };
		D3D12_TEXTURE_COPY_LOCATION nativeBufLocation = { tex.Get(), D3D12_TEXTURE_COPY_TYPE_SUBRESOURCE_INDEX, i };
		list->CopyTextureRegion(&nativeBufLocation, 0, 0, 0, &uploadBufLocation, nullptr);
	}
	list->ResourceBarrier(subResources, transitions2);
	uploadBuf->Unmap(0, nullptr);
	deviceMan.AddIntermediateCommandlistDependentResource(uploadBuf);
	deviceMan.AddIntermediateCommandlistDependentResource(tex);
}