Specialize core blitter based on ENGINE_MODE - Githubissues

lscharen / iigs-game-engine

A tile-based game engine for the Apple IIgs written in 65816 asssembly language

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Specialize core blitter based on ENGINE_MODE #19

Closed lscharen closed 1 year ago

lscharen commented 1 year ago

The core blitter template can be more aggressively tweaked when being instantiated based on the ENGINE_MODE.

Planned optimizations are

Remove the right_odd test and the bit test in odd_exit if TWO_LAYER and DYN_TILES are not set
Fix the snippet code based on ENGINE_MODE and put the AND #MASK / ORA #DATA instructions at fixed offsets. This will eliminate almost all of the work done in the CopyMaskedWord macro and significantly improve deferred sprite rending on complex tiles.

lscharen commented 1 year ago

Both of these improvements have landed in the eight-bit-hal branch