Lambda8
Lambda8 is a Fantasy computer that uses Lisp as its system language.
It's implemented in C using SDL 2.0.
A demo "game" is included.
This software is alpha state. In particular, loading files from disk is mostly a developing stage functionality.
The machine
The screen has a resolution of 256x128, with 4 bits of depth, rendered at 768x384 (3x). Colours are chosen from a 16-colour palette.
These are the available primitives in Lisp:
-
(pix x y c)
Renders a pixel at coordinates x,y in color c
-
(define-sprite filename)
Loads a sprite into memory from a file on disk. Returns a number which identifies the texture.
-
(spr id x y w h)
Renders the sprite identified by id at coordinates x,y with a size of w,h
-
(line x y x2 y2 c)
Draws a line from x,y to x2,y2 using color c
-
(rect x y x2 y2 c)
Draws a filled rectangle from x,y to x2,y2 using color c
-
(rectb x y x2 y2 c)
Draws a rectangle from x,y to x2,y2 using color c
-
(circ x y r c)
Draws a filled circle centered on x,y with radius r using color c
-
(circb x y r c)
Draws a circle centered on x,y with radius r using color c
-
(cls n)
Clears the screen using color n
-
(define-sfx filename)
Loads a sound effect into memory from a file on disk. Returns a number which identifies the sfx.
-
(sfx id)
Plays the sound effect identified by id.
-
(printxy text x y c)
Prints the text at x,y in color c
Core library
Lambda8 packs a core library with the following functions (defined in Lisp):
-
(btn n)
Returns #t if button n is pressed
-
(btnp n)
Returns #t if button n is pressed but wasn't pressed the previous frame (prevents repetition)
-
(filter p ls)
Returns a new list with the elements that satisfy predicate p, in the same order
-
(collideAABB a b)
Returns #t if the bounding boxes of sprites a and b are overlapping
-
(make-sprite filename-or-id x y w h)
Creates a new sprite object. It can either load a new texture from a file, or use the ID of an already loaded texture.
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