improve frame times, attempt to fix capped mode issue (#1492)

* apply patch by Ceski (don't use frame limiter for capped mode)

* Revert "add ability to set SDL render driver (#1359)"

This reverts commit 801c93872b74da35ab829c59e7c7eb096d25e73c.

* fix comment, bring back render info

src/d_loop.c

@@ -729,8 +729,7 @@ void TryRunTics (void)
 
     // [AM] If we've uncapped the framerate and there are no tics
     //      to run, return early instead of waiting around.
-    // Only check counts so that I_FinishUpdate() can handle frame timing.
-    #define return_early (counts == 0)
+    #define return_early (uncapped && counts == 0)
 
     // get real tics
     entertic = I_GetTime() / ticdup;

src/i_video.c

@@ -73,8 +73,6 @@ fixed_t fractionaltic;
 boolean disk_icon;  // killough 10/98
 int fps; // [FG] FPS counter widget
 
-char *sdl_renderdriver = "";
-
 // [FG] rendering window, renderer, intermediate ARGB frame buffer and texture
 
 static SDL_Window *screen;
@@ -372,7 +370,7 @@ static void UpdateLimiter(void)
     }
     else
     {
-        use_limiter = (targetrefresh > 0);
+        use_limiter = false;
     }
 }
 
@@ -1492,11 +1490,6 @@ static void I_InitGraphicsMode(void)
         flags |= SDL_RENDERER_PRESENTVSYNC;
     }
 
-    if (*sdl_renderdriver)
-    {
-        SDL_SetHint(SDL_HINT_RENDER_DRIVER, sdl_renderdriver);
-    }
-
     // [FG] create renderer
     renderer = SDL_CreateRenderer(screen, -1, flags);
 

src/i_video.h

@@ -68,8 +68,6 @@ void I_DynamicResolution(void);
 
 extern boolean drs_skip_frame;
 
-extern char *sdl_renderdriver;
-
 extern boolean use_vsync;  // killough 2/8/98: controls whether vsync is called
 extern boolean disk_icon;  // killough 10/98
 extern int current_video_height;

src/m_misc.c

@@ -142,24 +142,6 @@ default_t defaults[] = {
     "1 to enable dynamic resolution"
   },
 
-  {
-    "sdl_renderdriver",
-    (config_t *) &sdl_renderdriver, NULL,
-#if defined(_WIN32)
-    {.s = "direct3d11"},
-#else
-    {.s = ""},
-#endif
-    {0}, string, ss_none, wad_no,
-    "SDL render driver, possible values are "
-#if defined(_WIN32)
-    "direct3d, direct3d11, direct3d12, "
-#elif defined(__APPLE__)
-    "metal, "
-#endif
-    "opengl, opengles2, opengles, software"
-  },
-
   {
     "correct_aspect_ratio",
     (config_t *) &use_aspect, NULL,