mirror of https://github.com/bjornbytes/lovr.git
180 lines
5.0 KiB
C
180 lines
5.0 KiB
C
#include "resources/boot.lua.h"
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#include "api/api.h"
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#include "luax.h"
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#include "platform.h"
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#include "util.h"
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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lua_State* lovrInit(lua_State* L, int argc, char** argv);
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void lovrDestroy(void* arg);
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int main(int argc, char** argv);
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#ifndef LOVR_USE_OCULUS_MOBILE
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#ifdef EMSCRIPTEN
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#include <emscripten.h>
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typedef struct {
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lua_State* L;
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lua_State* T;
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int argc;
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char** argv;
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} lovrEmscriptenContext;
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void lovrDestroy(void* arg) {
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if (arg) {
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lovrEmscriptenContext* context = arg;
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lua_State* L = context->L;
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emscripten_cancel_main_loop();
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lua_close(L);
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}
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}
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static void emscriptenLoop(void* arg) {
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lovrEmscriptenContext* context = arg;
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lua_State* T = context->T;
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luax_geterror(T);
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luax_clearerror(T);
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if (lua_resume(T, 1) != LUA_YIELD) {
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bool restart = lua_type(T, -1) == LUA_TSTRING && !strcmp(lua_tostring(T, -1), "restart");
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int status = lua_tonumber(T, -1);
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lua_close(context->L);
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emscripten_cancel_main_loop();
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if (restart) {
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main(context->argc, context->argv);
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} else {
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lovrPlatformDestroy();
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exit(status);
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}
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}
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}
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#endif
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int main(int argc, char** argv) {
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lovrPlatformOpenConsole();
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if (argc > 1 && (!strcmp(argv[1], "--version") || !strcmp(argv[1], "-v"))) {
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lovrLog("LOVR %d.%d.%d (%s)\n", LOVR_VERSION_MAJOR, LOVR_VERSION_MINOR, LOVR_VERSION_PATCH, LOVR_VERSION_ALIAS);
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exit(0);
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}
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int status;
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bool restart;
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do {
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lua_State* L = luaL_newstate();
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luax_setmainthread(L);
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luaL_openlibs(L);
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lua_State* T = lovrInit(L, argc, argv);
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if (!T) {
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return 1;
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}
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lovrSetErrorCallback((errorFn*) luax_vthrow, T);
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#ifdef EMSCRIPTEN
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lovrEmscriptenContext context = { L, T, argc, argv };
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emscripten_set_main_loop_arg(emscriptenLoop, (void*) &context, 0, 1);
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return 0;
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#else
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while (lua_resume(T, 0) == LUA_YIELD) {
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lovrPlatformSleep(.001);
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}
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restart = lua_type(T, -1) == LUA_TSTRING && !strcmp(lua_tostring(T, -1), "restart");
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status = lua_tonumber(T, -1);
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lua_close(L);
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#endif
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} while (restart);
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lovrPlatformDestroy();
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return status;
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}
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#endif
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typedef enum { // What flag is being searched for?
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ARGFLAG_NONE, // Not processing a flag
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ARGFLAG_ROOT
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} ArgFlag;
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lua_State* lovrInit(lua_State* L, int argc, char** argv) {
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lovrAssert(lovrPlatformInit(), "Failed to initialize platform");
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lovrPlatformSetTime(0.);
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// arg table
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// Args follow the lua standard https://en.wikibooks.org/wiki/Lua_Programming/command_line_parameter
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// In this standard, the contents of argv are put in a global table named "arg", but with indices offset
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// such that the "script" (in lovr, the game path) is at index 0. So all arguments (if any) intended for
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// the script/game are at successive indices starting with 1, and the exe and its arguments are in normal
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// order but stored in negative indices.
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//
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// Lovr can be run in ways normal lua can't. It can be run with an empty argv, or with no script (if fused).
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// So in the case of lovr:
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// * The script path will always be at index 0, but it can be nil.
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// * For a fused executable, whatever is given in argv as script name is still at 0, but will be ignored.
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// * The exe (argv[0]) will always be the lowest-integer index. If it's present, it will always be -1 or less.
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// * Any named arguments parsed by Lovr will be stored in the arg table at their named keys.
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// * An exe name will always be stored in the arg table at string key "exe", even if none was supplied in argv.
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lua_newtable(L);
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// push dummy "lovr" in case argv is empty
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lua_pushliteral(L, "lovr");
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lua_setfield(L, -2, "exe");
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ArgFlag currentFlag = ARGFLAG_NONE;
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int lovrArgs = 0; // Arg count up to but not including the game path
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// One pass to parse flags
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for (int i = 0; i < argc; i++) {
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if (lovrArgs > 0) {
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// This argument is an argument to a -- flag
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if (currentFlag == ARGFLAG_ROOT) {
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lua_pushstring(L, argv[i]);
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lua_setfield(L, -2, "root");
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currentFlag = ARGFLAG_NONE;
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// This argument is a -- flag
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} else if (!strcmp(argv[1], "--root") || !strcmp(argv[1], "-r")) {
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currentFlag = ARGFLAG_ROOT;
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// This is the game path
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} else {
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break;
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}
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} else { // Found exe name
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lua_pushstring(L, argv[i]);
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lua_setfield(L, -2, "exe");
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}
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lovrArgs++;
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}
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// Now that we know the negative offset to start at, copy all args in the table
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for (int i = 0; i < argc; i++) {
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lua_pushstring(L, argv[i]);
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lua_rawseti(L, -2, -lovrArgs + i);
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}
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lua_setglobal(L, "arg");
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lua_getglobal(L, "package");
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lua_getfield(L, -1, "preload");
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luaL_register(L, NULL, lovrModules);
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lua_pop(L, 2);
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lua_pushcfunction(L, luax_getstack);
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if (luaL_loadbuffer(L, (const char*) boot_lua, boot_lua_len, "boot.lua") || lua_pcall(L, 0, 1, -2)) {
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lovrWarn("%s\n", lua_tostring(L, -1));
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return NULL;
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}
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lua_State* T = lua_newthread(L);
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lua_pushvalue(L, -2);
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lua_xmove(L, T, 1);
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return T;
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}
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