ohsp

commit 3d5248560bac8414c34da47fe0794b2ae0ada848
parent e2aefe68f080c390b8cfd870ae068f9eef6be646
Author: amin <dev@aminmesbah.com>
Date:   Mon, 20 Nov 2017 05:55:38 +0000

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.

FossilOrigin-Name: e7c2bf3b31b6b773c6bf16b6a2928a5d42f52f0b8666d6da3fffcdbd50c3e5c5
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)