ref: c34add7e08f11219bcdf9d71b6473215f0a4ae98
dir: /macros/gfx.asm/
assert_valid_rgb: MACRO rept _NARG assert 0 <= (\1) && (\1) <= 31, "RGB channel must be 0-31" shift endr ENDM RGB: MACRO rept _NARG / 3 assert_valid_rgb \1, \2, \3 dw palred (\1) + palgreen (\2) + palblue (\3) shift 3 endr ENDM palred EQUS "(1 << 0) *" palgreen EQUS "(1 << 5) *" palblue EQUS "(1 << 10) *" palettes EQUS "* PALETTE_SIZE" palette EQUS "+ PALETTE_SIZE *" color EQUS "+ PAL_COLOR_SIZE *" tiles EQUS "* LEN_2BPP_TILE" tile EQUS "+ LEN_2BPP_TILE *" ; extracts the middle two colors from a 2bpp binary palette ; example usage: ; INCBIN "foo.gbcpal", middle_colors middle_colors EQUS "PAL_COLOR_SIZE, PAL_COLOR_SIZE * 2" dbpixel: MACRO if _NARG >= 4 ; x tile, y tile, x pixel, y pixel db \1 * TILE_WIDTH + \3, \2 * TILE_WIDTH + \4 else ; x tile, y tile db \1 * TILE_WIDTH, \2 * TILE_WIDTH endc ENDM ldpixel: MACRO if _NARG >= 5 ; register, x tile, y tile, x pixel, y pixel lb \1, \2 * TILE_WIDTH + \4, \3 * TILE_WIDTH + \5 else ; register, x tile, y tile lb \1, \2 * TILE_WIDTH, \3 * TILE_WIDTH endc ENDM depixel EQUS "ldpixel de," bcpixel EQUS "ldpixel bc," dbsprite: MACRO ; x tile, y tile, x pixel, y pixel, vtile offset, attributes db (\2 * TILE_WIDTH) % $100 + \4, (\1 * TILE_WIDTH) % $100 + \3, \5, \6 ENDM