balapradeepswork / d3d11nv12rendering Goto Github PK

	D3D11_TEXTURE2D_DESC const texDesc = CD3D11_TEXTURE2D_DESC(
		DXGI_FORMAT_NV12,           // HoloLens PV camera format, common for video sources
		m_width,					// Width of the video frames
		m_height,					// Height of the video frames
		1,                          // Number of textures in the array
		1,                          // Number of miplevels in each texture
		D3D11_BIND_SHADER_RESOURCE, // We read from this texture in the shader
		D3D11_USAGE_DYNAMIC,        // Because we'll be copying from CPU memory
		D3D11_CPU_ACCESS_WRITE      // We only need to write into the texture
	);

void WriteNV12ToTexture(NV12Frame *nv12Frame)
{
	// Copy from CPU access texture to bitmap buffer
	D3D11_MAPPED_SUBRESOURCE resource;
	UINT subresource = D3D11CalcSubresource(0, 0, 0);
	OutMgr.m_DeviceContext->Map(OutMgr.m_texture, subresource, D3D11_MAP_WRITE_DISCARD, 0, &resource);

	BYTE* dptr = reinterpret_cast<BYTE*>(resource.pData);

	for (int i = 0; i < nv12Frame->height; i++)
	{
		memcpy(dptr + resource.RowPitch * i, nv12Frame->Y + nv12Frame->pitch * i, nv12Frame->pitch);
	}

	for (int i = 0; i < nv12Frame->height / 2; i++)
	{
		memcpy(dptr + resource.RowPitch *(nv12Frame->height + i), nv12Frame->UV + nv12Frame->pitch * i, nv12Frame->pitch);
	}

	OutMgr.m_DeviceContext->Unmap(OutMgr.m_texture, subresource);
}