pal_from_spr/pal_from_spr.p8
2023-10-01 12:00:14 -07:00

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pico-8 cartridge // http://www.pico-8.com
version 41
__lua__
-- sprite-sampled palette
-- kistaro@gmail.com
function _init()
-- lock top 16 rows to default palette
pal({[0]=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}, 2)
poke(0x5f5f, 0x10)
poke2(0x5f70, 0xffff)
mode = "boxes"
active = "sprite"
scx = 0
scy = 0
dcx = 0
dcy = 0
end
function _update()
if (btnp(🅾)) mode = (mode == "boxes") and "rows" or "boxes"
if (btnp()) active = (active == "sprite") and "draw" or "sprite"
if active == "sprite" then
if (btnp()) scy -= 1
if (btnp()) scy += 1
if (btnp()) scx -= 1
if (btnp()) scx += 1
else
if (btnp()) dcy -= 1
if (btnp()) dcy += 1
if (btnp()) dcx -= 1
if (btnp()) dcx += 1
end
scx %= (mode == "boxes") and box_cols or rows_cols
dcx %= (mode == "boxes") and box_cols or rows_cols
scy %= (mode == "boxes") and box_rows or rows_rows
dcy %= (mode == "boxes") and box_rows or rows_rows
end
function _draw()
cls()
draw_hud()
draw_bars()
end
function draw_hud()
palt()
if (mode == "boxes") return draw_box_hud()
draw_rows_hud()
end
function print_shadow(s,x,y,c)
print(s,x+1,y+1,1)
print(s,x,y,c or 7)
end
box_rows = 4
box_cols = 4
function draw_box_hud()
spr(1,0,0,4,2)
local toff = time() * 4 \ 1 % 2
spr(107 + (active == "sprite" and toff or 0),
8*scx,4*scy,1,0.5)
spr(109 + (active == "draw" and toff or 0),
8*dcx,4*dcy,1,0.5)
print_shadow("spr",34,4,12)
sspr(8+8*scx,4*scy,8,4,47,4,16,8)
print_shadow("draw",65,4,14)
sspr(8+8*dcx,4*dcy,8,4,83,4,16,8)
end
function draw_bars()
for i=0,15 do
local i6 = i * 6
rectfill(0,16+i6,128,i6+21,i)
end
for i=0,15 do
for y=16,120,8 do
spr(i+112,9+i*7,y,0.625,1)
end
end
for y=16,120,8 do
spr(111,120,y)
end
end
-->8
-- palette structure
palette = {
-- cols: table. identical
-- format to table-type
-- pal call
-- tr: transparency table.
-- keys: [0]..[15]
-- (color indexes)
-- vals: true/false/nil
-- for transparency of
-- that color. false
-- sets opaque, nil
-- means "do not set".
-- tables with no absent
-- values can be compiled
-- for faster do_palt.
-- cpl_tr: compiled tr. set by
-- compile_palt iff all
-- tr values in range
-- are nonnil. do_palt
-- is faster this way
}
palette_mt = {__index=palette}
function palette.new(x)
x = x or {}
if (not x.cols) x.cols = {}
if (not x.tr) x.tr = {}
setmetatable(x, palette_mt)
end
function palette:do_pal(p)
pal(self.cols, p)
end
function palette:do_palt()
if (self.cpl_tr) return palt(self.cpl_tr)
local tr = self.tr
for i=0,15 do
if (tr[i] ~= nil) palt(i, tr[i])
end
end
function palette:do_both(p)
self:do_palt()
self:do_pal(p)
end
function palette:compile_palt()
self.cpl_tr = nil
local bits, tr = 0, self.tr
for i = 15,0,-1 do
if (tr[i] == nil) return
bits <<= 1
if (tr[i]) bits += 1
end
self.cpl_tr = bits
return bits
end
__gfx__
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