Menus, game over, dying, etc.

1 files changed, 86 insertions, 0 deletions

diff --git a/menu.c b/menu.c
new file mode 100644
index 0000000..e4e82f5
--- /dev/null
+++ b/menu.c
@@ -0,0 +1,86 @@
+#include "asset.h"
+#include "input.h"
+#include "menu.h"
+
+#ifdef DEBUG
+#include "error.h"
+#include "platform.h"
+#endif
+
+void init_menu(Menu* menu, void* ptr) {
+	menu->el_count = 0;
+	menu->selected = 0;
+	menu->y = renderer_h / 2;
+	menu->h = 0;
+	menu->ptr = ptr;
+}
+
+void menu_add(
+	Menu* menu,
+	const char* text,
+	Menu_Event on_select,
+	const BM_Font* font
+) {
+	Menu_Item* it;
+	int i;
+
+#ifdef DEBUG
+	if (menu->el_count >= menu_max_elements) {
+		platform_err("Too many menu elements.\n");
+		platform_abort(error_gameplay_error);
+	}
+#endif
+
+	it = &menu->els[menu->el_count++];
+	it->on_select = on_select;
+	it->text_len = 0;
+	for (i = 0; text[i]; i++) {
+		it->text[i] = text[i];
+		it->text_len++;
+	} it->text[i] = 0;
+
+	menu->h = font->char_h * menu->el_count;
+	menu->y = renderer_h / 2 - (menu->h) / 2;
+}
+
+void update_menu(Menu* menu) {
+	if (button_just_pressed(btn_dpad_down)) {
+		menu->selected++;
+		if (menu->selected >= menu->el_count) {
+			menu->selected = 0;
+		}
+	}
+
+	if (button_just_pressed(btn_dpad_up)) {
+		menu->selected--;
+		if (menu->selected < 0) {
+			menu->selected = menu->el_count - 1;
+		}
+	}
+
+	if (
+		button_just_pressed(btn_jump) ||
+		button_just_pressed(btn_shoot)
+	) {
+		menu->els[menu->selected].on_select(menu);
+	}
+}
+
+void render_menu(Menu* menu, const BM_Font* font) {
+	int i, x, y, cw, ch;
+	const Menu_Item* el;
+
+	y = menu->y;
+	cw = font->char_w;
+	ch = font->char_h;
+
+	for (i = 0; i < menu->el_count; i++) {
+		el = &menu->els[i];
+		x = renderer_w / 2 - (cw * el->text_len) / 2;
+		rfont_text(font, x, y, el->text);
+		if (i == menu->selected) {
+			rfont_char(font, x - cw, y, '>');
+		}
+		y += ch;
+	}
+}