From 60388cb5de1d93636688cabfe84c18759c4d2141 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Sat, 07 Aug 2021 16:50:47 -0400
Subject: game: Poll for events

---
(limited to 'src')

diff --git a/src/game.c b/src/game.c
index bc43faa..0b546c0 100644
--- a/src/game.c
+++ b/src/game.c
@@ -55,6 +55,10 @@ mf_game(long seed, int size, int fow, int reveal, SDL_Renderer *renderer)
 	SDL_Color           form_color;
 	SDL_Color           text_color;
 	struct mftk_window *win         = NULL;
+	int                 fr;
+	Uint32              beg;
+	Uint32              end;
+	Uint32              delay;
 	SDL_Event           event;
 
 	/* Create maze */
@@ -90,27 +94,31 @@ mf_game(long seed, int size, int fow, int reveal, SDL_Renderer *renderer)
 				_mf_game_form(renderer, text_font,
 					&text_color)));
 
-	while (SDL_WaitEvent(&event)) {
-		switch (event.type) {
-			case SDL_QUIT:
-				goto quit;
-			case SDL_KEYDOWN:
-				switch (event.key.keysym.sym) {
-					case SDLK_ESCAPE:
-						goto exit;
+	fr = 30;
+	while(1) {
+		beg = SDL_GetTicks();
+		while (SDL_PollEvent(&event)) {
+			switch (event.type) {
+				case SDL_QUIT:
+					goto quit;
+				case SDL_KEYDOWN:
+					switch (event.key.keysym.sym) {
+						case SDLK_ESCAPE:
+							goto exit;
+					default:
+						break;
+					}
 				default:
 					break;
-				}
-			default:
-				break;
-		}
-		switch (mftk_window_event(win, &event)) {
-			case 0:
-				break;
-			case 1:
-				goto exit;
-			default:
-				goto err;
+			}
+			switch (mftk_window_event(win, &event)) {
+				case 0:
+					break;
+				case 1:
+					goto exit;
+				default:
+					goto err;
+			}
 		}
 		SDL_SetRenderDrawColor(renderer,
 				MF_COLOR_BACK_R, MF_COLOR_BACK_G,
@@ -119,6 +127,18 @@ mf_game(long seed, int size, int fow, int reveal, SDL_Renderer *renderer)
 		mf_maze_render(maze, renderer, &maze_color, MF_WINDOW_H / size);
 		mftk_window_render(win, renderer);
 		SDL_RenderPresent(renderer);
+		end = SDL_GetTicks();
+		if ((Uint32) (1000 / fr) > (end - beg)) {
+			delay = 1000 / fr - (end - beg);
+		} else {
+			SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
+					"Frame took longer than frame period");
+			delay = 0;
+		}
+		SDL_LogDebug(SDL_LOG_CATEGORY_APPLICATION,
+				"Frame took %u ms, delaying %u ms",
+				end - beg, delay);
+		SDL_Delay(delay);
 	}
 
  exit:
--
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