pokecrystal-board/macros/gfx.asm
2024-02-26 18:20:33 +01:00

101 lines
2.7 KiB
NASM

; Graphics macros
DEF palred EQUS "(1 << 0) *"
DEF palgreen EQUS "(1 << 5) *"
DEF palblue EQUS "(1 << 10) *"
MACRO assert_valid_rgb
rept _NARG
assert 0 <= (\1) && (\1) <= 31, "RGB channel must be 0-31"
shift
endr
ENDM
MACRO RGB
rept _NARG / 3
assert_valid_rgb \1, \2, \3
dw palred (\1) + palgreen (\2) + palblue (\3)
if DEF(fade_src)
DEF {fade_src}_{d:color_index} EQU \1
DEF color_index += 1
DEF {fade_src}_{d:color_index} EQU \2
DEF color_index += 1
DEF {fade_src}_{d:color_index} EQU \3
DEF color_index += 1
endc
shift 3
endr
ENDM
MACRO rgbpals_fade_src
; \1: name of fade source
DEF fade_src EQUS \1
DEF color_index = 0
ENDM
MACRO rgbpals_fade_src_end
DEF {fade_src}_len = color_index
PURGE fade_src
ENDM
MACRO rgbpals_fade_apply
; \1: name of fade source to fade from
; \2: name of fade source to fade to
; \3: additional intermediate fading steps
DEF fade_from EQUS \1
DEF fade_to EQUS \2
assert {fade_from}_len == {fade_to}_len, "fade_from pals and fade_to pals must be same length"
for i, 0, \3
for j, 0, {fade_from}_len, 3
DEF rgbch_red = {j} + 0
DEF rgbch_green = {j} + 1
DEF rgbch_blue = {j} + 2
DEF palred_value = {fade_from}_{d:rgbch_red} + ({fade_to}_{d:rgbch_red} - {fade_from}_{d:rgbch_red}) * (i + 1) / (\3 + 1)
DEF palgreen_value = {fade_from}_{d:rgbch_green} + ({fade_to}_{d:rgbch_green} - {fade_from}_{d:rgbch_green}) * (i + 1) / (\3 + 1)
DEF palblue_value = {fade_from}_{d:rgbch_blue} + ({fade_to}_{d:rgbch_blue} - {fade_from}_{d:rgbch_blue}) * (i + 1) / (\3 + 1)
dw palred (palred_value) + palgreen (palgreen_value) + palblue (palblue_value)
endr
endr
PURGE fade_from, fade_to, rgbch_red, rgbch_green, rgbch_blue, palred_value, palgreen_value, palblue_value
ENDM
DEF palettes EQUS "* PALETTE_SIZE"
DEF palette EQUS "+ PALETTE_SIZE *"
DEF color EQUS "+ PAL_COLOR_SIZE *"
DEF tiles EQUS "* LEN_2BPP_TILE"
DEF tile EQUS "+ LEN_2BPP_TILE *"
; extracts the middle two colors from a 2bpp binary palette
; example usage:
; INCBIN "foo.gbcpal", middle_colors
DEF middle_colors EQUS "PAL_COLOR_SIZE, PAL_COLOR_SIZE * 2"
MACRO dbpixel
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
MACRO ldpixel
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
DEF depixel EQUS "ldpixel de,"
DEF bcpixel EQUS "ldpixel bc,"
MACRO dbsprite
; 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