ReC98/th04/main/tile_section[data].asm

public _TILE_SECTION_OFFSETS
_TILE_SECTION_OFFSETS label word
	@@i = 0
	rept TILE_SECTION_COUNT_MAX
		dw (@@i * TILES_MEMORY_X * TILE_ROWS_PER_SECTION * word)
		@@i = (@@i + 1)
	endm
[Reverse-engineering] [th04/th05] Stage tiles: Initial ring buffer filling …Wow. A 32-element lookup table for the very computationally expensive operation of (i * 320), needlessly limiting the amount of unique 384×80 tile sections in a stage to 32… and then TH05 further "optimizes" this lookup by pre-multiplying all section IDs in the .STD file with the element size of that table, to save a grand total of 1 x86 instruction. Part of P0112, funded by [Anonymous] and Blue Bolt. 2020-08-26 19:55:08 +00:00			`public _TILE_SECTION_OFFSETS`
			`_TILE_SECTION_OFFSETS label word`
			`@@i = 0`
			`rept TILE_SECTION_COUNT_MAX`
			`dw (@@i * TILES_MEMORY_X * TILE_ROWS_PER_SECTION * word)`
			`@@i = (@@i + 1)`
			`endm`