--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libmlk-adventure/adventure/state/panic.c	Sat Nov 28 22:37:30 2020 +0100
@@ -0,0 +1,216 @@
+/*
+ * panic_state.c -- panic state
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <core/alloc.h>
+#include <core/error.h>
+#include <core/event.h>
+#include <core/font.h>
+#include <core/game.h>
+#include <core/painter.h>
+#include <core/panic.h>
+#include <core/state.h>
+#include <core/sys.h>
+#include <core/texture.h>
+#include <core/window.h>
+
+#include <ui/align.h>
+#include <ui/theme.h>
+
+#include "panic.h"
+
+#define BACKGROUND 0x4f5070ff
+#define FOREGROUND 0xffffffff
+
+#define OUT "molko-adventure.txt"
+
+struct view {
+	struct {
+		struct texture tex;
+		int x;
+		int y;
+	} texts[4];
+};
+
+static void
+die(const char *fmt, ...)
+{
+	assert(fmt);
+
+	va_list ap;
+
+	va_start(ap, fmt);
+	fprintf(stderr, "abort: ");
+	vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	abort();
+	exit(1);
+}
+
+static void
+stop(void)
+{
+	die("%s", error());
+}
+
+static void
+dump(void)
+{
+	FILE *fp;
+
+	if ((fp = fopen(OUT, "w"))) {
+		/* TODO: add more info here. */
+		fprintf(fp, "Molko's Adventure crash dump report\n");
+		fclose(fp);
+	}
+
+	abort();
+}
+
+static struct view *
+init(void)
+{
+	struct theme *theme;
+	struct view *view;
+	struct font *font;
+
+	theme = theme_default();
+	font = theme->fonts[THEME_FONT_INTERFACE];
+	view = alloc_new0(sizeof (*view));
+
+	if (!font_render(font, &view->texts[0].tex, "An unrecoverable error occured and the game cannot continue.", FOREGROUND) ||
+	    !font_render(font, &view->texts[1].tex, "Please report the detailed error as provided below.", FOREGROUND) ||
+	    !font_render(font, &view->texts[2].tex, "Press <s> to save information and generate a core dump.", FOREGROUND) ||
+	    !font_render(font, &view->texts[3].tex, "Press <q> to quit without saving information.", FOREGROUND))
+		die("%s", error());
+
+	/* All align x the same. */
+	for (size_t i = 0; i < NELEM(view->texts); ++i)
+		view->texts[i].x = theme->padding;
+
+	/* Header (0-1). */
+	view->texts[0].y = theme->padding;
+	view->texts[1].y = view->texts[0].y + view->texts[0].tex.h + theme->padding;
+
+	/* Footer. (2-3). */
+	view->texts[3].y = window.h - view->texts[2].tex.h - theme->padding;
+	view->texts[2].y = view->texts[3].y - view->texts[3].tex.h - theme->padding;
+
+	return view;
+}
+
+static void
+handle_keydown(const struct event_key *ev)
+{
+	assert(ev);
+
+	switch (ev->key) {
+	case KEY_q:
+		game_quit();
+		break;
+	case KEY_s:
+		dump();
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+start(struct state *state)
+{
+	(void)state;
+
+	/* We remove the panic handler to avoid infinite recursion. */
+	panic_handler = stop;
+}
+
+static void
+handle(struct state *state, const union event *ev)
+{
+	assert(ev);
+
+	(void)state;
+
+	switch (ev->type) {
+	case EVENT_KEYDOWN:
+		handle_keydown(&ev->key);
+		break;
+	default:
+		break;
+	}
+}
+
+static void
+draw(struct state *state)
+{
+	struct theme *theme = theme_default();
+	struct view *view = state->data;
+	struct texture tex;
+	struct font *font;
+	int x, y;
+
+	painter_set_color(BACKGROUND);
+	painter_clear();
+
+	for (size_t i = 0; i < NELEM(view->texts); ++i)
+		texture_draw(&view->texts[i].tex, view->texts[i].x, view->texts[i].y);
+
+	/* The error is only available here. */
+	font = theme->fonts[THEME_FONT_INTERFACE];
+
+	if (!font_render(font, &tex, error(), FOREGROUND))
+		die("%s\n", error());
+
+	align(ALIGN_LEFT, &x, &y, tex.w, tex.h, 0, 0, window.w, window.h);
+
+	texture_draw(&tex, x + theme->padding, y);
+	texture_finish(&tex);
+}
+
+static void
+finish(struct state *state)
+{
+	struct view *view = state->data;
+
+	if (!view)
+		return;
+
+	for (size_t i = 0; i < NELEM(view->texts); ++i)
+		texture_finish(&view->texts[i].tex);
+
+	free(view);
+	memset(state, 0, sizeof (*state));
+}
+
+void
+panic_state(struct state *state)
+{
+	assert(state);
+
+	memset(state, 0, sizeof (*state));
+	state->data = init();
+	state->start = start;
+	state->handle = handle;
+	state->draw = draw;
+	state->finish = finish;
+}