Add new debug key 'f': show framerate bar

4 files changed, 43 insertions, 0 deletions

diff --git a/emu.c b/emu.c
index 93ad382..cebf4c0 100644
--- a/emu.c
+++ b/emu.c
@@ -883,6 +883,10 @@ static void do_controller(void)
 			hide_sprites ^= 1;
 			break;
 
+		case 'f':
+			show_fps ^= 1;
+			break;
+
 		case 'x':
 			dump(0, 0x4000);
 			break;
diff --git a/platform-sdl.c b/platform-sdl.c
index d586dfc..72ec1e9 100644
--- a/platform-sdl.c
+++ b/platform-sdl.c
@@ -184,6 +184,7 @@ static char handle_debug_key(int key)
 	case 'q':
 	case 'w': case 'e':
 	case 'a': case 's': case 'd':
+	case 'f':
 	case 'v': case 'c':
 		return (key);
 	}
diff --git a/video.c b/video.c
index 8888b19..aa1f7e3 100644
--- a/video.c
+++ b/video.c
@@ -20,9 +20,42 @@ u32 screen[320*240];
 int hide_page_1;
 int hide_page_2;
 int hide_sprites;
+int show_fps = 0;
 int trace_unknown_video = 1;
 
 
+static void fill_rect(u32 x, u32 y, u32 w, u32 h, u32 rgb)
+{
+	u32 xx, yy;
+	for (yy = y; yy < y + h; yy++)
+		for (xx = x; xx < x + w; xx++)
+			screen[320*yy + xx] = rgb;
+}
+
+static void do_show_fps(void)
+{
+	static u32 fps = 0;
+
+	const int per_n = 10;
+	static int count = 0;
+	count++;
+	if (count == per_n) {
+		static u32 last = 0;
+		u32 now = get_realtime();
+		if (last)
+			fps = 1000000 * per_n / (now - last);
+		last = now;
+		count = 0;
+	}
+
+	if (fps > 50)
+		fps = 50;
+
+	fill_rect(3, 3, 7, 52, 0xffffff);
+	fill_rect(4, 4, 5, 50 - fps, 0x000000);
+	fill_rect(4, 54 - fps, 5, fps, 0x00ff00);
+}
+
 static const u8 sizes[] = { 8, 16, 32, 64 };
 static const u8 colour_sizes[] = { 2, 4, 6, 8 };
 
@@ -515,6 +548,9 @@ void blit_screen(void)
 		if (!hide_sprites)
 			blit_sprites(depth);
 	}
+
+	if (show_fps)
+		do_show_fps();
 }
 
 void video_init(void)
diff --git a/video.h b/video.h
index 62ec189..729b13f 100644
--- a/video.h
+++ b/video.h
@@ -14,6 +14,8 @@ extern int hide_page_1;
 extern int hide_page_2;
 extern int hide_sprites;
 
+extern int show_fps;
+
 
 void video_store(u16 val, u32 addr);
 u16 video_load(u32 addr);