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Reduce number of reads for sprite region

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Empathic Qubit 2021-05-02 01:08:32 -04:00
parent 4d078da6f8
commit aa6f8babc8
3 changed files with 19 additions and 14 deletions
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17
game.lua
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@ -231,28 +231,29 @@ function _M.getJumpHeight()
end end
function _M.getSprite(idx) function _M.getSprite(idx)
local base_addr = idx * mem.size.sprite + mem.addr.spriteBase local baseAddr = idx * mem.size.sprite + mem.addr.spriteBase
local spriteData = memory.readregion(baseAddr, mem.size.sprite)
local offsets = mem.offset.sprite local offsets = mem.offset.sprite
local control = memory.readword(base_addr + offsets.control) local control = util.regionToWord(spriteData, offsets.control)
if control == 0 then if control == 0 then
return nil return nil
end end
local x = memory.readword(base_addr + offsets.x) local x = util.regionToWord(spriteData, offsets.x)
local y = memory.readword(base_addr + offsets.y) local y = util.regionToWord(spriteData, offsets.y)
local sprite = { local sprite = {
control = control, control = control,
screenX = x - 256 - _M.cameraX - 256, screenX = x - 256 - _M.cameraX - 256,
screenY = y - 256 - _M.cameraY - 256, screenY = y - 256 - _M.cameraY - 256,
jumpHeight = memory.readword(base_addr + offsets.jumpHeight), jumpHeight = util.regionToWord(spriteData, offsets.jumpHeight),
-- style bits -- style bits
-- 0x4000 0: Right facing 1: Flipped -- 0x4000 0: Right facing 1: Flipped
-- 0x1000 0: Alive 1: Dying -- 0x1000 0: Alive 1: Dying
style = memory.readword(base_addr + offsets.style), style = util.regionToWord(spriteData, offsets.style),
velocityX = memory.readsword(base_addr + offsets.velocityX), velocityX = util.regionToWord(spriteData, offsets.velocityX),
velocityY = memory.readsword(base_addr + offsets.velocityY), velocityY = util.regionToWord(spriteData, offsets.velocityY),
x = x, x = x,
y = y, y = y,
good = spritelist.Sprites[control] good = spritelist.Sprites[control]

9
state-test.lua
View file

@ -1,5 +1,6 @@
local classes = _SYSTEM.all_classes() print(string.hex(bit.compose(0xef, 0xbe)))
io.stderr:write(classes:gsub(classes:sub(8,1), '\n')) local base = string.gsub(@@LUA_SCRIPT_FILENAME@@, "(.*[/\\])(.*)", "%1")
for k,v in pairs(_SYSTEM) do local game = dofile(base.."/game.lua")
print(k)
function on_input()
end end

7
util.lua
View file

@ -241,8 +241,11 @@ function _M.nearestColor(needle, colors)
return value return value
end end
function _M.regionToWord(region, offset)
return bit.compose(region[offset], region[offset + 1])
end
return function(promise) return function(promise)
Promise = promise Promise = promise
return _M return _M
end end