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textri
This API was added in version 0.46.
textri x1 y1 x2 y2 x3 y3 u1 v1 u2 v2 u3 v3 [use_map=false] [trans=-1]
- x1, y1 : the screen coordinates of the first corner
- x2, y2 : the screen coordinates of the second corner
- x3, y3 : the screen coordinates of the third corner
- u1, v1 : the UV coordinates of the first corner
- u2, v2 : the UV coordinates of the second corner
- u3, v3 : the UV coordinates of the third corner
-
use_map : if false (default), the triangle's texture is read from
SPRITES
RAM. If true, the texture comes from theMAP
RAM. - trans : index (or array of indexes 0.80) of the color(s) that will be used as transparent
These can be thought of as the window inside SPRITES
or MAP
RAM. Note that the sprite sheet or map in this case is treated as a single large image, with U and V addressing its pixels directly, rather than by sprite ID. So for example the top left corner of sprite #2 would be located at u=16
(horizontal), v=0
(vertical).
This function draws a triangle filled with texture from either SPRITES
or MAP
RAM.
This function does not perform perspective correction, so it is not generally suitable for 3D graphics (except in some constrained scenarios). In particular, if the vertices in the triangle have different 3D depth, you may see some distortion.
-- title: triangle demo
-- author: MonstersGoBoom
-- desc: wiki demo for textri
-- script: lua
-- input: gamepad
usize = 32
vsize = 32
function TIC()
cls(1)
if btn(0) then usize=usize-1 end
if btn(1) then usize=usize+1 end
if btn(2) then vsize=vsize-1 end
if btn(3) then vsize=vsize+1 end
-- draw a scaling view into the map ram
textri(0,0,
64,0,
0,64,
0,0,
usize,0,
0,vsize,
true,
14)
textri(64,0,
0,64,
64,64,
usize,0,
0,vsize,
usize,vsize,
true,
14)
end
TIC-80 tiny computer https://tic80.com | Twitter | Telegram | Terms
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API
- BDR (0.90)
- BOOT (1.0)
- MENU
- OVR (deprecated)
- SCN (deprecated)
- TIC
- btn & btnp
- circ & circb
- clip
- cls
- elli & ellib (0.90)
- exit
- fget & fset (0.80)
- font
- key & keyp
- line
- map
- memcpy & memset
- mget & mset
- mouse
- music
- peek, peek4
- peek1, peek2 (1.0)
- pix
- pmem
- poke, poke4
- poke1, poke2 (1.0)
- rect & rectb
- reset
- sfx
- spr
- sync
- ttri (1.0)
- time
- trace
- tri & trib (0.90)
- tstamp (0.80)
- vbank (1.0)