create a launcher.

this lets you launch into a duktape engine or a quickjs engine, but the
quickjs engine isn't implemented yet.

source/duktape/duktape_engine.c

@@ -14,8 +14,8 @@ static float deltatime = 1.0f/60;
 static unsigned int green = RGBA(0, 255, 0, 255); 
 static GRRLIB_ttfFont * font;
 
-static void duk_fatal_error(void *udata, const char *msg) {
+static void duk_fatal_error(void *udata, const char * msg) {
-	const char * err_message_format = "an error has occured: %s";
+	const char * err_message_format = "a fatal error has occured: %s";
 	size_t message_size = strlen(err_message_format) + strlen(msg) * sizeof(char *);
 	char * message = malloc(message_size);
 	snprintf(message, message_size, err_message_format, msg);
@@ -25,6 +25,29 @@ static void duk_fatal_error(void *udata, const char *msg) {
 	}
 }
 
+static void duk_error_loop(duk_context * ctx, const char * msg) {
+	const char * err_message_format = "an error has occured: %s";
+	size_t message_size = strlen(err_message_format) + strlen(msg) * sizeof(char *);
+	char * message = malloc(message_size);
+	snprintf(message, message_size, err_message_format, msg);
+	bool error_loop_running = true;
+
+	while (error_loop_running) {
+		PAD_ScanPads();
+		unsigned int pressed = PAD_ButtonsDown(0);
+
+		GRRLIB_PrintfTTF(0, 0, font, message, 12, green);
+		GRRLIB_PrintfTTF(0, 20, font, "Press A to exit", 12, green);
+		GRRLIB_Render();
+
+		if (pressed & PAD_BUTTON_A) {
+			error_loop_running = false;
+		}
+	}
+
+	duk_destroy_heap(ctx);
+}
+
 void duktape(GRRLIB_ttfFont * global_font, bool * running) {
 	font = global_font;	
 	duk_context * ctx = duk_create_heap(NULL, NULL, NULL, NULL, duk_fatal_error);
@@ -38,7 +61,14 @@ void duktape(GRRLIB_ttfFont * global_font, bool * running) {
 
 	// call start function
 	duk_get_global_string(ctx, "start");
-	duk_call(ctx, 0);
+	duk_int_t status = duk_pcall(ctx, 0);
+
+	if (status == DUK_EXEC_ERROR) {
+		duk_error_loop(ctx, duk_safe_to_string(ctx, -1));
+		*running = false;
+		return;
+	}
+
 	duk_pop(ctx);
 
 	while (*running) {
@@ -48,7 +78,14 @@ void duktape(GRRLIB_ttfFont * global_font, bool * running) {
 
 		// call update function
 		duk_get_global_string(ctx, "update");
-		duk_call(ctx, 0);
+		duk_int_t status = duk_pcall(ctx, 0);
+
+		if (status == DUK_EXEC_ERROR) {
+			duk_error_loop(ctx, duk_safe_to_string(ctx, -1));
+			*running = false;
+			return;
+		}
+
 		duk_pop(ctx);
 
 		GRRLIB_Render();
@@ -56,5 +93,7 @@ void duktape(GRRLIB_ttfFont * global_font, bool * running) {
 		const unsigned int endOfFrame = ticks_to_microsecs(gettime());
 		deltatime = (endOfFrame - beginningOfFrame) * MICROSECOND;
 	}
+
+	duk_destroy_heap(ctx);
 }
 

source/main.c

@@ -1,5 +1,6 @@
 #include <grrlib.h>
 #include <duktape.h>
+#include <ogc/pad.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <ogc/lwp_watchdog.h>
@@ -7,10 +8,102 @@
 #include <data.h>
 #include <duktape_engine.h>
 
-static bool running = true;
+#define LENGTH(arr) (sizeof(arr) / sizeof(arr[0]))
+
+static bool launcher_running = true;
+static bool running = false;
 static GRRLIB_ttfFont * font;
+static unsigned int green = RGBA(0, 255, 0, 255); 
+static unsigned int white = RGBA(255, 255, 255, 255); 
+
+struct menu_item {
+	const char * message;
+	void (*entrypoint)();
+};
+
+struct menu_items {
+	size_t selected_index;	
+	struct menu_item * items[2];
+};
+
+static struct menu_items items = {
+	.selected_index = 0,
+	.items = {}
+};
+
+static struct menu_item * create_menu_item(const char * message, void (*entrypoint)()) {
+	struct menu_item * item = malloc(sizeof(struct menu_item));
+	item->message = message;
+	item->entrypoint = entrypoint;
+	return item;
+}
+
+static void start_duktape() {
+	running = true;
+	duktape(font, &running);	
+}
+
+static void start_quickjs() {
+	running = true;
+	while (running) {
+		PAD_ScanPads();
+		unsigned int pressed = PAD_ButtonsDown(0);
+		GRRLIB_PrintfTTF(0, 0, font, "QuickJS is not implemented, yet..", 48, RGBA(255, 255, 255, 255));
+		GRRLIB_Render();
+		if (pressed & PAD_BUTTON_START) {
+			running = false;
+		}
+	}
+}
+
+static void update_menu(unsigned int * pressed) {
+	if (*pressed & PAD_BUTTON_DOWN) {
+		int selected_index = items.selected_index;
+		selected_index += 1;
+		if (selected_index >= LENGTH(items.items)) {
+			selected_index = 0;
+		}
+		items.selected_index = selected_index;
+	} else if (*pressed & PAD_BUTTON_UP) {
+		int selected_index = items.selected_index;
+		selected_index -= 1;
+		if (selected_index < 0) {
+			selected_index = LENGTH(items.items) - 1;
+		}
+		items.selected_index = selected_index;
+	}
+
+	if (*pressed & PAD_BUTTON_A) {
+		items.items[items.selected_index]->entrypoint();
+	}
+
+	for (size_t i = 0; i < LENGTH(items.items); i++) {
+		unsigned int color;
+		if (items.selected_index == i) {
+			color = green;
+		} else {
+			color = white;
+		}
+		GRRLIB_PrintfTTF(0, 80 + (50 * i), font, items.items[i]->message, 64, color);
+	}
+}
+
+static void launcher_loop() {
+	while (launcher_running) {
+		PAD_ScanPads();
+		unsigned int pressed = PAD_ButtonsDown(0);
+		if (pressed & PAD_BUTTON_START) {
+			launcher_running = false;
+			return;
+		}
+		GRRLIB_PrintfTTF(0, 0, font, "WiiDuktape Launcher", 64, RGBA(255, 255, 255, 255));
+		update_menu(&pressed);
+		GRRLIB_Render();
+	}
+}
 
 int main(int argc, char **argv) {
+	GRRLIB_SetAntiAliasing(false);
 	GRRLIB_Init();
 	PAD_Init();
 
@@ -21,8 +114,16 @@ int main(int argc, char **argv) {
 
 	font = GRRLIB_LoadTTF(pixel_operator_font, pixel_operator_font_size);
 
-	duktape(font, &running);
+	items.items[0] = create_menu_item("Duktape", start_duktape);
-	
+	items.items[1] = create_menu_item("QuickJS", start_quickjs);
+
+	launcher_loop();
+
+	for (size_t i = 0; i < LENGTH(items.items); i++) {
+		// clear out heap allocated memory.
+		free(items.items[i]);
+	}
+
 	GRRLIB_Exit();
 
 	return 0;