cl-tcod /

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Welcome to CL-TCOD, an interface between Common Lisp and the Doryen Library
("libtcod"), a portable truecolour console library intended for use with
roguelike games.

CL-TCOD consists of the following files:

1. TCOD.LISP, a lisp file which creates lisp bindings for C functions in the
   compiled libtcod library, using the "CFFI" lisp foreign function interface.

2. TCOD.ASD, which allows TCOD to be easily loaded and used as a library by
   other common lisp programs, via the "ASDF" library-loading facility.

3. TCOD-COLOURS.LISP, a lisp file containing definitions for all the colours
   named in /etc/X11/rgb.txt; autogenerated using 'parse-rgb' (see below)
   
4. PARSE-RGB.LISP, a lisp file containing code for parsing /etc/X11/rgb.txt
   and generating tcod-colours.lisp

5. PARSE-RGB.ASD, ASDF system definition file for PARSE-RGB.LISP

CL-TCOD has been tested with SBCL 1.0.32 and Clozure 1.4 on Linux. 

**Note** that it has not been used on a Mac; if you do this you may need to
tell CFFI what the name of the compiled libtcod library under MacOS is. To do
this, open tcod.lisp in an editor, find the '(define-foreign-library...'
clause, uncomment the '(:macintosh...)' line and change the string on that line
to the name of the libtcod library file.


    
=======
Licence
=======

The CL-TCOD package is placed in the Public Domain by its author.



=====================
Hints on installation
=====================


You need to know your way around your chosen common lisp and how to install and
load lisp libraries before proceeding. You also need to have a version of
libtcod newer than 1.4.1rc2, which is the first version that includes the
'wrappers.c' and 'wrappers.h' source files that allow CL-TCOD to interface with
libtcod.

1. Ensure you have a working common lisp installation. 
2. Ensure the ASDF lisp library is installed.
3. If CFFI is not installed (see above), download and install it somewhere ASDF can
   find it. CFFI requires several third-party lisp libraries -- see the CFFI
   documentation for more details.
4. Put the CL-TCOD files in a directory where ASDF can find them.
5. Make sure libtcod is installed and compiled. Make sure the libtcod
   dynamically linked library (.DLL or .SO file) is somewhere your lisp system
   can find it. It probably is, but if CFFI complains about being unable to
   find the library, you can either copy it to an appropriate directory or add
   its directory to the list variable cffi:*foreign-library-directories*
   e.g. by typing the following in the lisp interpreter:

   (push #P"/my/libtcod/directory/" cffi:*foreign-library-directories*)

   *On windows*, DLL files should be put in one of the directories listed in the
   "PATH" environment variable. You will need to put SDL.dll in the same place
   if you don't already have SDL installed.

   *On Linux*, you can usually put .SO files in /usr/local/lib/.
   Use your package installer to install "libSDL".
   Try running the libtcod demo programs to check everything works.
   
6. Start lisp. Load ASDF, then CL-TCOD:

   (load "/path/to/asdf/asdf.lisp")
   (asdf:oos 'asdf:load-op :tcod)

7. Type something like the following commands at the lisp prompt to start using TCOD
from within Lisp:

   (tcod:console-set-custom-font "myfont.bmp" :font-layout-ascii-in-row 16 16)
   (tcod:console-init-root 80 25 "Test" nil)
   (tcod:console-clear tcod:*root*)
   (tcod:console-print-left tcod:*root* 1 1 :set "Hello, world!~%")
   (tcod:console-wait-for-keypress t)




=======================================
Differences between CL-TCOD and libtcod
=======================================


1. Naming conventions
   ------------------

The C function 'TCOD_foobar' corresponds to the lisp function 'foobar', which is in
the 'tcod' package (and so requires a prefix of 'tcod:' to access in most
situations). Underscores become hyphens. So:

  TCOD_foobar_function(a, b)     <===>    (tcod:foobar-function a b)

"Predicate functions" are functions whose main job is to return a boolean value (true or
false) that answers a question. These have a terminal '?' added to their name:

  TCOD_console_is_fullscreen()   <===>    (tcod:console-is-fullscreen?)

C enums have generally more succinct names. As they are lisp keywords, their
names all begin with ':'. THey are named according to the following pattern:

  TCODK_BACKSPACE (etc)         <===>  :backspace
  TCOD_CHAR_HLINE  (etc)        <===>  :char-hline
  TCOD_COLCTRL_1  (etc)         <===>  :colctrl-1
  TCOD_BKGND_SET (etc)          <===>  :set
  TCOD_FONT_LAYOUT_ASCII_INCOL  <===>  :font-layout-ascii-in-col 
  FOV_SHADOW                    <===>  :fov-shadow
  TCOD_KEY_PRESSED              <===>  :key-pressed
  CENTER                        <===>  :center

In general, all functions exist in both U.S. and non-U.S. spellings, This is
mainly relevant to those functions with colour/color in their name.


2. Colournums
   ----------

In libtcod, colours are represented as structures containing three integer
values: red, green and blue (each 0-255). The name of the structure type is
TCOD_color_t.

In CL-TCOD, these colour structs are converted into 3-byte integers using the C
functions int_to_color(int) and color_to_int(TCOD_color_t), both defined in
wrappers.c. The 3 bytes are red, green and blue in order (blue is 1's). ie:

    /* C */                              ;; lisp ;;
   struct TCOD_color_t {r, g, b}  <==>   #x00RRGGBB

So, for example, one way to use the function TCOD_color_multiply_scalar from
lisp is:

  (tcod:color-multiply-scalar (tcod:compose-colour 218 165 32) 0.5)

All C functions that take or return TCOD_color_t structs, are wrapped by lisp
functions that take or return integers as described above.


3. Colours by keyword
   ------------------

A lisp keyword is any symbol beginning with ':'. In lisp, keywords (like all
symbols) are first-class values and can be passed around just like any other
value. CL-TCOD uses keywords to refer to particular colours, for example the
keyword :cyan refers to the colour #x0056A3CD (or 5678029 in decimal notation).

You can use keywords instead of colournums as arguments to lisp functions, by
using the function COLOUR to return the colournum associated with a keyword:

  (tcod:colour :cyan)    -->    5678029


You can also define your own colour names, like so:

  (tcod:make-colour :my-goldenrod 218 165 32)
  (tcod:color-multiply-scalar (tcod:colour :my-goldenrod) 0.5)

CL-TCOD knows all the colour names defined in the 'rgb.txt' file under Xwindows
(Unix/Linux), eg :navajo-white, :honeydew, :mint-cream, and so on. There is
nothing special about the fact that rgb.txt comes from Xwindows -- the colours
are just named R,G,B values and can be used anywhere that CL-TCOD can be
used. Look in the source file 'tcod-colours.lisp' to see the available colour
names.


4. Lisp format versus C printf
   ---------------------------
   
  The TCOD functions that accept 'printf'-like string-formatting arguments,
  have been modified to instead accept arguments to Common Lisp's 'format'
  function.'  For example:

    TCOD_console_print_left (con, x, y, TCOD_BKGND_SET,
      "Printing at %d, %d\n", x, y);

    becomes:

    (tcod:console-print-left con x y :set "Printing at ~D, ~D~%" x y)

    
4. Miscellaneous extra functions
   -----------------------------
   
  (tcod:console-print-double-frame CONSOLE X Y W H EMPTY? STRING...)
  
     - Like console-print-frame, but draws using "double-line"
       characters.
     

=========
Resources
=========


The latest version of CL-TCOD is available at:

    http://bitbucket.org/eeeickythump/cl-tcod/

The latest version of libtcod is available at:

    http://doryen.eptalys.net/libtcod/

This Common Lisp package depends on CFFI, the Common Foreign Function Interface:

    http://common-lisp.net/project/cffi/

Learn Common Lisp (free book):

    http://www.gigamonkeys.com/book/

Full-featured, free Common Lisp implementations:

    http://www.sbcl.org (compiles to machine code)
    http://clisp.cons.org (bytecode compiler, but the friendliest on Win32)
    http://ccl.clozure.com (compiles to machine code)
    
"Lisp in a Box" -- aims to make it easy to start using Common Lisp by providing
a single download with everything set up in advance:

    http://common-lisp.net/project/lispbox/

Help & advice with lisp:

    http://www.lispforum.com

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