From 9d331d766c9093c4c003d6b3629a9f1c69b08174 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 27 Jan 2022 05:08:23 -0500
Subject: menu: Render at 30 fps, not just on input events

This is necessary to blink the text cursor.
---
(limited to 'src/menu.c')

diff --git a/src/menu.c b/src/menu.c
index b03ab8b..b171d2b 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -226,7 +226,11 @@ mf_menu(SDL_Renderer *renderer)
 	TTF_Font           *title_font  = NULL;
 	TTF_Font           *text_font   = NULL;
 	struct mftk_window *win         = NULL;
+	int                 fr;
+	Uint32              beg;
 	SDL_Event           event;
+	Uint32              end;
+	Uint32              delay;
 
 	/* Create maze */
 	maze = mf_maze_new(time(NULL),
@@ -285,27 +289,31 @@ mf_menu(SDL_Renderer *renderer)
 
 	SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
 
-	while (SDL_WaitEvent(&event)) {
-		switch (event.type) {
-			case SDL_QUIT:
-				goto quit;
-			case SDL_KEYDOWN:
-				switch (event.key.keysym.sym) {
-					case SDLK_ESCAPE:
-						goto quit;
+	fr = 10;
+	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 quit;
+					default:
+						break;
+					}
 				default:
 					break;
-				}
-			default:
-				break;
-		}
-		switch (mftk_window_event(win, &event)) {
-			case 0:
-				break;
-			case 1:
-				goto quit;
-			default:
-				goto err;
+			}
+			switch (mftk_window_event(win, &event)) {
+				case 0:
+					break;
+				case 1:
+					goto quit;
+				default:
+					goto err;
+			}
 		}
 		SDL_SetRenderDrawColor(renderer,
 				MF_COLOR_BACK_R, MF_COLOR_BACK_G,
@@ -315,6 +323,18 @@ mf_menu(SDL_Renderer *renderer)
 				MF_MENU_MAZE_CELL_W);
 		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);
 	}
 
  quit:
--
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