ohsp

commit 150436a59771ce18483305e05a1599988ae78df4
parent 6d77e0f78aa203c44661d8b88e489a65bbc4b56c
Author: Amin Mesbah <mesbahamin@gmail.com>
Date:   Sun, 19 Nov 2017 21:55:38 -0800

Add ability to skip screen clearing

- t key toggles 'trace'

Note that this exposes the non-determinism of the current game loop. The
lag compensation while-loop updates the game state, but not the input.
The variance in the number of these updates causes divergent results
even when identical input is played over a given initial state.

Diffstat:
M
src/platform_sdl.c
 | 
10
+++++++++-

1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/src/platform_sdl.c b/src/platform_sdl.c
@@ -17,6 +17,7 @@ extern bool PAUSED;
 
 static struct SDLOffscreenBuffer global_back_buffer = {0};
 static struct SDLInputRecord input_record = {0};
+static bool TRACE = false;
 
 
 struct SDLWindowDimension sdl_get_window_dimension(SDL_Window *window)
@@ -117,6 +118,10 @@ bool sdl_handle_event(SDL_Event *event, struct GameControllerInput *controller_i
                 {
                     PAUSED = !PAUSED;
                 }
+                else if (key_code == SDLK_t)
+                {
+                    TRACE = !TRACE;
+                }
                 else if (key_code == SDLK_r)
                 {
                     if (input_record.state == INACTIVE)
@@ -397,7 +402,10 @@ int main(int argc, char *argv[])
                     }
                 }
 
-                clear_screen(&global_back_buffer, COLOR_BACKGROUND);
+                if (!TRACE)
+                {
+                    clear_screen(&global_back_buffer, COLOR_BACKGROUND);
+                }
                 game_code.game_render(&buffer, lag/SECOND, &game_state);
                 sdl_update_window(renderer, &global_back_buffer);
                 if (elapsed_ms <= MS_PER_FRAME)