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.
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