Add a callback for customizing how textures are set during rendering #2528
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… rendering. DX12: Only generate the Font texture if it doesn't already exist. Only set texture if it actually changes. These changes can enable better integration to existing rendereres by ensuring that all ImTextureID objects are the same type as defined by the user.
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Context:
DX12 (and I think Vulkan) have a much more complicated resource management system. This change enabled better integration with existing render systems. For DX12 it can help prevent having multiple calls to SetDescriptorHeaps in a frame which can be a costly operation.
Changes: