[DX12] Simple texture uploader

simple_texture_uploader.cpp

void afWriteBuffer(const ComPtr<ID3D12Resource> res, const void* buf, int size)
{
	void* p;
	D3D12_RANGE readRange = {};
	res->Map(0, &readRange, &p);
	memcpy(p, buf, size);
	D3D12_RANGE wroteRange = {0, (SIZE_T)size};
	id->Unmap(0, &wroteRange);
}

ComPtr<ID3D12Resource> afCreateBuffer(int size, const void* buf)
{
	D3D12_HEAP_PROPERTIES prop = { D3D12_HEAP_TYPE_UPLOAD, D3D12_CPU_PAGE_PROPERTY_UNKNOWN, D3D12_MEMORY_POOL_UNKNOWN, 1, 1 };
	D3D12_RESOURCE_DESC desc = { D3D12_RESOURCE_DIMENSION_BUFFER, 0, (UINT64)size, 1, 1, 1, DXGI_FORMAT_UNKNOWN, { 1, 0 }, D3D12_TEXTURE_LAYOUT_ROW_MAJOR, D3D12_RESOURCE_FLAG_NONE };
	UBOID o;
	deviceMan.GetDevice()->CreateCommittedResource(&prop, D3D12_HEAP_FLAG_NONE, &desc, D3D12_RESOURCE_STATE_GENERIC_READ, nullptr, IID_PPV_ARGS(&o));
	afWriteBuffer(o, buf, size);
	return o;
}

void UploadTexture(ComPtr<ID3D12Resource> tex, const void* buf)
{
	D3D12_PLACED_SUBRESOURCE_FOOTPRINT footprint;
	UINT64 uploadSize, rowSizeInBytes;
	const D3D12_RESOURCE_DESC destDesc = tex->GetDesc();
	deviceMan.GetDevice()->GetCopyableFootprints(&destDesc, 0, 1, 0, &footprint, nullptr, &rowSizeInBytes, &uploadSize);

	assert(rowSizeInBytes == footprint.Footprint.RowPitch); // It is safe in most case!

	ComPtr<ID3D12Resource> uploadBuf = afCreateBuffer((int)uploadSize, buf);
	D3D12_TEXTURE_COPY_LOCATION uploadBufLocation = { uploadBuf.Get(), D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT, footprint }, nativeBufLocation = { tex.Get(), D3D12_TEXTURE_COPY_TYPE_SUBRESOURCE_INDEX, 0 };
	ID3D12GraphicsCommandList* list = deviceMan.GetCommandList();

	D3D12_RESOURCE_BARRIER transition1 = { D3D12_RESOURCE_BARRIER_TYPE_TRANSITION, D3D12_RESOURCE_BARRIER_FLAG_NONE, { tex.Get(), 0, D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE, D3D12_RESOURCE_STATE_COPY_DEST } };
	list->ResourceBarrier(1, &transition1);
	list->CopyTextureRegion(&nativeBufLocation, 0, 0, 0, &uploadBufLocation, nullptr);
	D3D12_RESOURCE_BARRIER transition2 = { D3D12_RESOURCE_BARRIER_TYPE_TRANSITION, D3D12_RESOURCE_BARRIER_FLAG_NONE, { tex.Get(), 0, D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE } };
	list->ResourceBarrier(1, &transition2);

	deviceMan.AddIntermediateCommandlistDependentResource(uploadBuf); // keep until the command queue has been flushed
}