DirectXTexのDDSロードサンプル

Load texture from DDS.cpp

// Load texture from DDS.
{
	std::unique_ptr<uint8_t[]> ddsData;
	std::vector<D3D12_SUBRESOURCE_DATA> subresouceData;
	ThrowIfFailed(LoadDDSTextureFromFile(m_device.Get(),
		L"test.DDS",
		&m_texture, 
		ddsData, 
		subresouceData));
	D3D12_RESOURCE_DESC textureDesc = m_texture->GetDesc();

	const UINT subresoucesize 
			= static_cast<UINT>(subresouceData.size());	
	const UINT64 uploadBufferSize 
			= GetRequiredIntermediateSize(m_texture.Get(), 0, subresoucesize);

	// Create the GPU upload buffer.
	ThrowIfFailed(m_device->CreateCommittedResource(
		&CD3DX12_HEAP_PROPERTIES(D3D12_HEAP_TYPE_UPLOAD),
		D3D12_HEAP_FLAG_NONE,
		&CD3DX12_RESOURCE_DESC::Buffer(uploadBufferSize),
		D3D12_RESOURCE_STATE_GENERIC_READ,
		nullptr,
		IID_PPV_ARGS(&textureUploadHeap)));

	UpdateSubresources(m_commandList.Get(), 
		m_texture.Get(), 
		textureUploadHeap.Get(),
		0, 
		0, 
		subresoucesize, 
		&subresouceData[0]);
	m_commandList->ResourceBarrier(1, 
		&CD3DX12_RESOURCE_BARRIER::Transition(m_texture.Get(), 
		D3D12_RESOURCE_STATE_COPY_DEST,
			D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE));

	// Describe and create a SRV for the texture.
	D3D12_SHADER_RESOURCE_VIEW_DESC srvDesc = {};
	srvDesc.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
	srvDesc.Format = textureDesc.Format;
	srvDesc.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
	srvDesc.Texture2D.MipLevels = subresoucesize;
	m_device->CreateShaderResourceView(m_texture.Get(), 
		&srvDesc, 
		m_srvHeap->GetCPUDescriptorHandleForHeapStart());
	
	m_commandList->DiscardResource(textureUploadHeap.Get(), nullptr);
}