implement pause

Makefile

@@ -6,7 +6,7 @@ SRCDIR=src
 ODIR=obj
 LIBS=-lallegro-debug -lallegro_audio-debug -lallegro_acodec-debug -lallegro_image-debug -lallegro_font-debug -lallegro_ttf-debug -lm
 
-_OBJ = config.o main.o about.o intro.o loading.o map.o menu.o level.o 
+_OBJ = config.o main.o about.o intro.o loading.o map.o menu.o level.o pause.o 
 OBJ = $(patsubst %,$(ODIR)/%,$(_OBJ))
 
 OUTPUTDIR = bin

src/level.c

@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <math.h>
+#include "pause.h"
 #include "level.h"
 
 void Level_Draw(struct Game *game) {
@@ -53,6 +54,10 @@ int Level_Keydown(struct Game *game, ALLEGRO_EVENT *ev) {
 		UnloadGameState(game);
 		game->loadstate = GAMESTATE_MENU;
 		LoadGameState(game);
+	} else if (ev->keyboard.keycode==ALLEGRO_KEY_P) {
+		game->gamestate = GAMESTATE_PAUSE;
+		game->loadstate = GAMESTATE_LEVEL;
+		Pause_Load(game);
 	}
 	return 0;
 }

src/main.c

@@ -11,6 +11,7 @@
 #include "intro.h"
 #include "map.h"
 #include "level.h"
+#include "pause.h"
 #include "config.h"
 
 /*! \brief Macro for preloading gamestate.
@@ -35,7 +36,7 @@
 #define KEYDOWN_STATE(state, name) else if (game.gamestate==state) { if (name ## _Keydown(&game, &ev)) break; }
 /*! \brief Macro for drawing active gamestate. */
 #define DRAW_STATE(state, name) case state:\
-	name ## _Draw(&game); break;
+	name ## _Draw(game); break;
 
 void al_draw_text_with_shadow(ALLEGRO_FONT *font, ALLEGRO_COLOR color, float x, float y, int flags, char const *text) {
 	al_draw_text(font, al_map_rgba(0,0,0,128), x+1, y+1, flags, text);
@@ -94,6 +95,7 @@ void UnloadGameState(struct Game *game) {
 				PrintConsole(game, "Just stopping GAMESTATE_MENU..."); Menu_Stop(game);
 			}
 			break;
+		UNLOAD_STATE(GAMESTATE_PAUSE, Pause)
 		UNLOAD_STATE(GAMESTATE_LOADING, Loading)
 		UNLOAD_STATE(GAMESTATE_ABOUT, About)
 		UNLOAD_STATE(GAMESTATE_INTRO, Intro)
@@ -122,6 +124,28 @@ void LoadGameState(struct Game *game) {
 	game->loadstate = -1;
 }
 
+void DrawGameState(struct Game *game) {
+	switch (game->gamestate) {
+		DRAW_STATE(GAMESTATE_MENU, Menu)
+		DRAW_STATE(GAMESTATE_PAUSE, Pause)
+		DRAW_STATE(GAMESTATE_LOADING, Loading)
+		DRAW_STATE(GAMESTATE_ABOUT, About)
+		DRAW_STATE(GAMESTATE_INTRO, Intro)
+		DRAW_STATE(GAMESTATE_MAP, Map)
+		DRAW_STATE(GAMESTATE_LEVEL, Level)
+		default:
+			game->showconsole = true;
+			PrintConsole(game, "ERROR: Unknown gamestate %d reached! (5 sec sleep)", game->gamestate);
+			DrawConsole(game);
+			al_flip_display();
+			al_rest(5.0);
+			PrintConsole(game, "Returning to menu...");
+			game->gamestate = GAMESTATE_LOADING;
+			game->loadstate = GAMESTATE_MENU;
+			break;
+	}
+}
+
 void ScaleBitmap(ALLEGRO_BITMAP* source, int width, int height, float val) {
 	if ((al_get_bitmap_width(source)==width) && (al_get_bitmap_height(source)==height)) {
 		al_draw_bitmap(source, 0, 0, 0);
@@ -310,6 +334,7 @@ int main(int argc, char **argv){
 			if ((ev.type == ALLEGRO_EVENT_KEY_DOWN) && (ev.keyboard.keycode == ALLEGRO_KEY_TILDE)) {
 				game.showconsole = !game.showconsole;
 			}
+			KEYDOWN_STATE(GAMESTATE_PAUSE, Pause)
 			KEYDOWN_STATE(GAMESTATE_MENU, Menu)
 			KEYDOWN_STATE(GAMESTATE_LOADING, Loading)
 			KEYDOWN_STATE(GAMESTATE_ABOUT, About)
@@ -330,24 +355,7 @@ int main(int argc, char **argv){
 	
 		if(redraw && al_is_event_queue_empty(game.event_queue)) {
 			redraw = false;
-			switch (game.gamestate) {
-				DRAW_STATE(GAMESTATE_MENU, Menu)
-				DRAW_STATE(GAMESTATE_LOADING, Loading)
-				DRAW_STATE(GAMESTATE_ABOUT, About)
-				DRAW_STATE(GAMESTATE_INTRO, Intro)
-				DRAW_STATE(GAMESTATE_MAP, Map)
-				DRAW_STATE(GAMESTATE_LEVEL, Level)
-				default:
-					game.showconsole = true;
-					PrintConsole(&game, "ERROR: Unknown gamestate %d reached! (5 sec sleep)", game.gamestate);
-					DrawConsole(&game);
-					al_flip_display();
-					al_rest(5.0);
-					PrintConsole(&game, "Returning to menu...");
-					game.gamestate = GAMESTATE_LOADING;
-					game.loadstate = GAMESTATE_MENU;
-					break;
-			}
+			DrawGameState(&game);
 			DrawConsole(&game);
 			al_flip_display();
 		}

src/main.h

@@ -16,6 +16,7 @@
 
 /*! \brief Enum of all available gamestates. */
 enum gamestate_enum {
+	GAMESTATE_PAUSE,
 	GAMESTATE_LOADING,
 	GAMESTATE_MENU,
 	GAMESTATE_ABOUT,
@@ -77,6 +78,11 @@ struct Loading {
 	ALLEGRO_BITMAP *image;
 };
 
+/*! \brief Resources used by Pause state. */
+struct Pause {
+	ALLEGRO_BITMAP *bitmap;
+};
+
 /*! \brief Resources used by About state. */
 struct About {
 	ALLEGRO_BITMAP *fade_bitmap;
@@ -139,6 +145,7 @@ struct Game {
 	struct About about;
 	struct Map map;
 	struct Level level;
+	struct Pause pause;
 };
 
 /*! \brief Draws text with shadow.
@@ -172,4 +179,6 @@ void ScaleBitmap(ALLEGRO_BITMAP* source, int width, int height, float val);
 ALLEGRO_BITMAP* LoadFromCache(struct Game *game, char* filename, int width, int height);
 float tps(struct Game *game, float t);
 
+void DrawGameState(struct Game *game);
+
 #endif

src/pause.c

@@ -0,0 +1,41 @@
+/*! \file pause.c
+ *  \brief Pause state.
+ */
+
+#include <stdio.h>
+#include "pause.h"
+
+int Pause_Keydown(struct Game *game, ALLEGRO_EVENT *ev) {
+	if ((ev->keyboard.keycode == ALLEGRO_KEY_ESCAPE) || (ev->keyboard.keycode==ALLEGRO_KEY_P)) {
+		al_destroy_bitmap(game->pause.bitmap);
+		game->gamestate = game->loadstate;
+	}
+	return 0;
+}
+
+void Pause_Load(struct Game* game) {
+	game->gamestate=game->loadstate;
+	DrawGameState(game);
+	game->gamestate=GAMESTATE_PAUSE;
+	ALLEGRO_BITMAP *fade = al_create_bitmap(al_get_display_width(game->display), al_get_display_height(game->display));
+	al_set_target_bitmap(fade);
+	al_clear_to_color(al_map_rgb(0,0,0));
+	al_set_target_bitmap(al_get_backbuffer(game->display));
+	al_draw_tinted_bitmap(fade,al_map_rgba_f(1,1,1,0.75),0,0,0);
+	al_draw_text_with_shadow(game->font, al_map_rgb(255,255,255),  al_get_display_width(game->display)*0.5, al_get_display_height(game->display)*0.5, ALLEGRO_ALIGN_CENTRE,"Game paused!");
+	game->pause.bitmap = al_create_bitmap(al_get_display_width(game->display), al_get_display_height(game->display));
+	al_set_target_bitmap(game->pause.bitmap);
+	al_draw_bitmap(al_get_backbuffer(game->display), 0, 0, 0);
+	al_set_target_bitmap(al_get_backbuffer(game->display));
+}
+
+void Pause_Draw(struct Game* game) {
+	al_draw_bitmap(game->pause.bitmap, 0, 0, 0);
+	DrawConsole(game);
+}
+
+void Pause_Unload(struct Game* game) {
+	al_destroy_bitmap(game->pause.bitmap);
+	game->gamestate=game->loadstate;
+	UnloadGameState(game);
+}

src/pause.h

@@ -0,0 +1,11 @@
+/*! \file pause.h
+ *  \brief Pause state headers.
+ */
+
+#include "main.h"
+
+void Pause_Draw(struct Game *game);
+void Pause_Preload(struct Game *game);
+void Pause_Unload(struct Game *game);
+void Pause_Load(struct Game *game);
+int Pause_Keydown(struct Game *game, ALLEGRO_EVENT *ev);