From 3938a78503c8099b409f4cb5e511464d1fb70b22 Mon Sep 17 00:00:00 2001
From: Sebastian Krzyszkowiak <dos@dosowisko.net>
Date: Mon, 16 Apr 2018 01:06:58 +0200
Subject: [PATCH] live reloading

---
 src/internal.c      | 30 +++++++++++++++++++++++++-----
 src/internal.h      |  2 ++
 src/libsuperderpy.c | 20 +++++++++++++++++---
 src/libsuperderpy.h |  2 ++
 4 files changed, 46 insertions(+), 8 deletions(-)

diff --git a/src/internal.c b/src/internal.c
index 736c460..bfb720b 100644
--- a/src/internal.c
+++ b/src/internal.c
@@ -267,6 +267,11 @@ SYMBOL_INTERNAL bool OpenGamestate(struct Game* game, struct Gamestate* gamestat
 		FatalError(game, false, "Error while opening gamestate \"%s\": %s", gamestate->name, dlerror()); // TODO: move out
 		return false;
 	}
+	if (game->handlers.compositor) {
+		gamestate->fb = CreateNotPreservedBitmap(game->_priv.clip_rect.w, game->_priv.clip_rect.h);
+	} else {
+		gamestate->fb = al_create_sub_bitmap(al_get_backbuffer(game->display), game->_priv.clip_rect.x, game->_priv.clip_rect.y, game->_priv.clip_rect.w, game->_priv.clip_rect.h);
+	}
 	return true;
 }
 
@@ -312,11 +317,6 @@ SYMBOL_INTERNAL struct Gamestate* AllocateGamestate(struct Game* game, const cha
 	tmp->pending_unload = false;
 	tmp->next = NULL;
 	tmp->api = NULL;
-	if (game->handlers.compositor) {
-		tmp->fb = CreateNotPreservedBitmap(game->_priv.clip_rect.w, game->_priv.clip_rect.h);
-	} else {
-		tmp->fb = al_create_sub_bitmap(al_get_backbuffer(game->display), game->_priv.clip_rect.x, game->_priv.clip_rect.y, game->_priv.clip_rect.w, game->_priv.clip_rect.h);
-	}
 	return tmp;
 }
 
@@ -489,3 +489,23 @@ SYMBOL_INTERNAL char* GetLibraryPath(struct Game* game, char* filename) {
 	al_destroy_path(path);
 	return result;
 }
+
+SYMBOL_INTERNAL void PauseExecution(struct Game* game) {
+	game->_priv.paused = true;
+	PrintConsole(game, "DEBUG: game execution paused.");
+}
+
+SYMBOL_INTERNAL void ResumeExecution(struct Game* game) {
+	PrintConsole(game, "DEBUG: reloading the gamestates...");
+	struct Gamestate* tmp = game->_priv.gamestates;
+	while (tmp) {
+		char* name = strdup(tmp->name);
+		CloseGamestate(game, tmp);
+		tmp->name = name;
+		OpenGamestate(game, tmp);
+		LinkGamestate(game, tmp);
+		tmp = tmp->next;
+	}
+	game->_priv.paused = false;
+	PrintConsole(game, "DEBUG: game execution resumed.");
+}
diff --git a/src/internal.h b/src/internal.h
index 1938547..8ff57cb 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -89,5 +89,7 @@ bool LinkGamestate(struct Game* game, struct Gamestate* gamestate);
 void CloseGamestate(struct Game* game, struct Gamestate* gamestate);
 struct Gamestate* AllocateGamestate(struct Game* game, const char* name);
 char* GetLibraryPath(struct Game* game, char* filename);
+void PauseExecution(struct Game* game);
+void ResumeExecution(struct Game* game);
 
 #endif
diff --git a/src/libsuperderpy.c b/src/libsuperderpy.c
index 4c2d5fc..cffc131 100644
--- a/src/libsuperderpy.c
+++ b/src/libsuperderpy.c
@@ -74,6 +74,8 @@ SYMBOL_EXPORT struct Game* libsuperderpy_init(int argc, char** argv, const char*
 	game->_priv.garbage = NULL;
 	game->_priv.timelines = NULL;
 
+	game->_priv.paused = false;
+
 	game->handlers.event = NULL;
 	game->handlers.destroy = NULL;
 	game->handlers.compositor = NULL;
@@ -463,10 +465,12 @@ SYMBOL_INTERNAL void libsuperderpy_mainloop(void* g) {
 			double delta = al_get_time() - game->_priv.timestamp;
 			game->_priv.timestamp += delta;
 			delta *= ALLEGRO_BPS_TO_SECS(al_get_timer_speed(game->_priv.timer) / (1 / 60.f));
-			LogicGamestates(game, delta);
+			if (!game->_priv.paused) {
+				LogicGamestates(game, delta);
+				DrawGamestates(game);
+			}
 			//redraw = true;
 
-			DrawGamestates(game);
 			DrawConsole(game);
 			//al_wait_for_vsync();
 			al_flip_display();
@@ -516,6 +520,10 @@ SYMBOL_INTERNAL void libsuperderpy_mainloop(void* g) {
 				al_acknowledge_resize(game->display);
 				SetupViewport(game, game->viewport_config);
 				ResizeGamestates(game);
+			} else if ((game->config.debug) && (ev.type == ALLEGRO_EVENT_DISPLAY_SWITCH_OUT)) {
+				PauseExecution(game);
+			} else if ((game->config.debug) && (ev.type == ALLEGRO_EVENT_DISPLAY_SWITCH_IN)) {
+				ResumeExecution(game);
 			}
 #ifdef ALLEGRO_ANDROID
 			else if ((ev.type == ALLEGRO_EVENT_KEY_CHAR) && ((ev.keyboard.keycode == ALLEGRO_KEY_MENU) || (ev.keyboard.keycode == ALLEGRO_KEY_TILDE) || (ev.keyboard.keycode == ALLEGRO_KEY_BACKQUOTE))) {
@@ -529,10 +537,16 @@ SYMBOL_INTERNAL void libsuperderpy_mainloop(void* g) {
 			} else if ((ev.type == ALLEGRO_EVENT_KEY_DOWN) && (game->config.debug) && (ev.keyboard.keycode == ALLEGRO_KEY_F1)) {
 				int i;
 				for (i = 0; i < 512; i++) {
-					LogicGamestates(game, ALLEGRO_BPS_TO_SECS(al_get_timer_speed(game->_priv.timer)));
+					LogicGamestates(game, 1.0 / 60.0);
 				}
 				game->_priv.showconsole = true;
 				PrintConsole(game, "DEBUG: 512 frames skipped...");
+			} else if ((ev.type == ALLEGRO_EVENT_KEY_DOWN) && (game->config.debug) && (ev.keyboard.keycode == ALLEGRO_KEY_F9)) {
+				if (game->_priv.paused) {
+					PauseExecution(game);
+				} else {
+					ResumeExecution(game);
+				}
 			} else if ((ev.type == ALLEGRO_EVENT_KEY_DOWN) && (game->config.debug) && (ev.keyboard.keycode == ALLEGRO_KEY_F10)) {
 				double speed = ALLEGRO_BPS_TO_SECS(al_get_timer_speed(game->_priv.timer)); // inverting
 				speed -= 10;
diff --git a/src/libsuperderpy.h b/src/libsuperderpy.h
index 6ec5a94..8664ff6 100644
--- a/src/libsuperderpy.h
+++ b/src/libsuperderpy.h
@@ -132,6 +132,8 @@ struct Game {
 			int w, h;
 		} clip_rect;
 
+		bool paused;
+
 #ifdef ALLEGRO_MACOSX
 		char cwd[MAXPATHLEN];
 #endif