115 lines
3.5 KiB
C
115 lines
3.5 KiB
C
#include <stdio.h>
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#include <stdarg.h>
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/* external functions */
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int nhmain(int argc, char *argv[]);
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typedef void(*stub_callback_t)(const char *name, void *ret_ptr, const char *fmt, ...);
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void shim_graphics_set_callback(stub_callback_t cb);
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/* forward declarations */
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void window_cb(const char *name, void *ret_ptr, const char *fmt, ...);
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void *yourFunctionToRenderGraphics(const char *name, va_list args);
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int main(int argc, char *argv[]) {
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shim_graphics_set_callback(window_cb);
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nhmain(argc, argv);
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}
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void *yourFunctionToRenderGraphics(const char *name, va_list args) {
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printf("yourFunctionToRenderGraphics name %s\n", name);
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/* DO SOMETHING HERE */
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return NULL;
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}
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void window_cb(const char *name, void *ret_ptr, const char *fmt, ...) {
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void *ret;
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va_list args;
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/* TODO -- see windowCallback below for hints */
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va_start(args, fmt);
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ret = yourFunctionToRenderGraphics(name, args);
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// *((int *)ret_ptr = *((int *)ret); // e.g. yourFunctionToRenderGraphics returns an int
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va_end(args);
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}
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#if 0
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function variadicCallback(name, retPtr, fmt, args) {
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// console.log ("variadicCallback called...");
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// console.log("typeof name", typeof name);
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// console.log("typeof fmt", typeof fmt);
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// console.log("typeof args", typeof args);
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name = Module.UTF8ToString(name);
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fmt = Module.UTF8ToString(fmt);
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// console.log ("name:", name);
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// console.log ("fmt:", fmt);
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let argTypes = fmt.split("");
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let retType = argTypes.shift();
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// console.log ("arg count:", argTypes.length);
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// console.log ("arg types:", argTypes);
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// console.log ("ret type:", retType);
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let jsArgs = [];
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for (let i = 0; i < argTypes.length; i++) {
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let ptr = args + (4*i);
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let val = typeLookup(argTypes[i], ptr);
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jsArgs.push(val);
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}
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console.log(`graphics callback: ${name} [${jsArgs}]`);
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setReturn(retPtr, retType);
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}
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function setReturn(ptr, type, value = 0) {
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switch (type) {
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case "p":
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throw new Error("not implemented");
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case "s":
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value=value?value:"(no value)";
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var strPtr = Module.getValue(ptr, "i32");
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Module.stringToUTF8(value, strPtr, 1024);
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break;
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case "i":
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Module.setValue(ptr, value, "i32");
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break;
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case "c":
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Module.setValue(ptr, value, "i8"); // 'Z'
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break;
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case "f":
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// XXX: I'm not sure why 'double' works and 'float' doesn't
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Module.setValue(ptr, value, "double");
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break;
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case "d":
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Module.setValue(ptr, value, "double");
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break;
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case "v":
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break;
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default:
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throw new Error("unknown type");
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}
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}
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function typeLookup(type, ptr) {
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switch(type) {
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case "s": // string
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return Module.UTF8ToString(Module.getValue(ptr, "*"));
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case "p": // pointer
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return Module.getValue(Module.getValue(ptr, "*"), "*");
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case "c": // char
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return String.fromCharCode(Module.getValue(Module.getValue(ptr, "*"), "i8"));
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case "0": /* 2^0 = 1 byte */
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return Module.getValue(Module.getValue(ptr, "*"), "i8");
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case "1": /* 2^1 = 2 bytes */
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return Module.getValue(Module.getValue(ptr, "*"), "i16");
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case "2": /* 2^2 = 4 bytes */
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case "i": // integer
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case "n": // number
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return Module.getValue(Module.getValue(ptr, "*"), "i32");
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case "f": // float
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return Module.getValue(Module.getValue(ptr, "*"), "float");
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case "d": // double
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return Module.getValue(Module.getValue(ptr, "*"), "double");
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default:
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throw new TypeError ("unknown type:" + type);
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}
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}
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#endif /* 0 */
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