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