Temporal AA would require offset on projection matrix that currently not support in ReShade. I don't know what that means, but I know it is so. Would it be possible to add TXAA to ReShade in the future? It would be a KILLER feature!
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MonarchX This means that the shader requires the projection matrix from the current and from older frames so the AA shader can reconstruct the moment of objects on the screen in time (that's the "temporal" part). And retrieving world/view/projection/whatever matrices from any game on a generic basis is, as crosire said, not possible at all.