Unless your objective is to learn C and SDL, I would recommend writing the
game entirely in Racket and using the Racket graphics facilities -- you
will find that the performance will be more than enough for a roguelike
game that you want to develop. Also, there are more people that can help
you with Racket graphics questions, should you have any.
There is also a sdl2 package on pkgs.racket-lang.org, if you want to use
SDL from Racket.
Alex.
On Wednesday, October 2, 2019 at 9:31:09 PM UTC+8, Hans Sjunnesson wrote:
>
> This is a hobby project of mine - a game in C, using SDL. I'd like to only
> use C for the rendering part - rather use a scripting language for all of
> the gameplay code. I want to try to use Racket for this - I've been doing
> enough Clojure that I'm familiar with a lisp. My first approach was to
> following along "Embedding into a Program" section of the Racket guide. But
> I'm running into road blocks - and I can't find any good examples of
> projects which embed Racket in a C program that calls functions in a Racket
> environment. My initial plan was to define a Racket module that provided an
> "init", an "update", and a "draw" function, then call those from the C
> program. The embedding guide points me to using "raco" to generate a C
> version of "racket/base", and that works - I can eval basic stuff, but I'm
> getting an error when I (require "test.rkt"). So I'm guessing there's more
> to be done with setting up the environment.
>
> My "test.rkt" file is this:
>
> #lang racket/base
>
> (printf "Hello World!\n")
>
> And this is the pertinent part of the main.c file, which links libracket.
>
> #include "scheme.h"
> #include "base.c"
>
> static int run(Scheme_Env* e, int argc, char* argv[]) {
> scheme_env = e;
>
> declare_modules(e);
>
> scheme_namespace_require(scheme_intern_symbol("racket/base"));
>
> Scheme_Config* config = scheme_current_config();
> Scheme_Object *curout = scheme_get_param(config, MZCONFIG_OUTPUT_PORT);
> Scheme_Object* v = scheme_eval_string("(+ 1 2)", scheme_env);
> scheme_display(v, curout);
> scheme_display(scheme_make_char('\n'), curout);
>
> scheme_eval_string("(require \"test.rkt\")", scheme_env);
>
> return 0;
> }
>
> int main(int argc, char* argv[]) {
> scheme_main_setup(1, run, argc, argv);
> return 0;
> }
>
> The output is:
>
> 3
> standard-module-name-resolver: collection not found
> for module path: racket/base/lang/reader
> collection: "racket/base/lang"
> in collection directories:
> context...:
> show-collection-err_0
> standard-module-name-resolver
> 1/module-path-index-resolve
> do-dynamic-require5_0
> read-syntax3_0
> default-load-handler
> standard-module-name-resolver
> 1/module-path-index-resolve
> perform-require!78.1
> for-loop_0
> expand-capturing-lifts
> temp118_0
> temp91_0
> compile15_0
> temp85_0
>
> I'm thinking that the environment isn't correctly setup here, the "in
> collection directories" lists is empty.
>
> Am I going about this the wrong way though? Would I be better served in
> setting up all of the game loops, etc. in Racket, then use FFI just for
> rendering with SDL?
>
> The game I'm making is a roguelike, so performance isn't as critical.
>
--
You received this message because you are subscribed to the Google Groups
"Racket Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to racket-users+unsubscr...@googlegroups.com.
To view this discussion on the web visit
https://groups.google.com/d/msgid/racket-users/4e4c300f-de73-496c-822d-41ea67f7da4d%40googlegroups.com.
