experimental main loop timing settings (disabled by default)

ianmaclarty · Sep 30, 2016 · 9f20e33 · 9f20e33
1 parent bcf5f6b
commit 9f20e33
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Showing 4 changed files with 11 additions and 2 deletions.
diff --git a/lua/time.lua b/lua/time.lua
@@ -30,6 +30,8 @@ function am.perf_stats()
         end
     end
     --log("total time = %0.5f, max_time = %0.5f", total_time, max_dt)
+    stats.time = total_time
+    stats.frames = count
     stats.min_fps = 1 / max_dt
     stats.avg_fps = count / total_time
     return stats

diff --git a/src/am_backend_sdl.cpp b/src/am_backend_sdl.cpp
@@ -472,14 +472,19 @@ int main( int argc, char *argv[] )
 
         if (am_conf_fixed_delta_time > 0.0) {
             while (t_debt > 0.0) {
+                double t0 = am_get_current_time();
                 if (!am_execute_actions(L, am_conf_fixed_delta_time)) {
                     exit_status = EXIT_FAILURE;
                     goto quit;
                 }
-                t_debt -= am_conf_fixed_delta_time;
+                double t = am_get_current_time() - t0;
+                t_debt -= am_max(t, am_conf_fixed_delta_time);
             }
         } else {
             if (t_debt > am_conf_min_delta_time) {
+                if (am_conf_delta_time_step > 0.0) {
+                    t_debt = floor(t_debt / am_conf_delta_time_step + 0.5) * am_conf_delta_time_step;
+                }
                 if (!am_execute_actions(L, t_debt)) {
                     exit_status = EXIT_FAILURE;
                     goto quit;

diff --git a/src/am_config.cpp b/src/am_config.cpp
@@ -16,7 +16,8 @@ int am_conf_default_recursion_limit = 8;
 const char *am_conf_default_modelview_matrix_name = "MV";
 const char *am_conf_default_projection_matrix_name = "P";
 
-double am_conf_fixed_delta_time = -1.0; //1.0 / 60.0; //-1.0;
+double am_conf_fixed_delta_time = -1.0; //1.0 / 60.0;
+double am_conf_delta_time_step = -1.0; //1.0/240.0;
 double am_conf_min_delta_time = 1.0/240.0;
 double am_conf_max_delta_time = 1.0/15.0;
 double am_conf_warn_delta_time = -1.0; //1.0/30.0;

diff --git a/src/am_config.h b/src/am_config.h
@@ -18,6 +18,7 @@ extern const char *am_conf_default_projection_matrix_name;
 
 // game loop options
 extern double am_conf_fixed_delta_time;
+extern double am_conf_delta_time_step;
 extern double am_conf_min_delta_time;
 extern double am_conf_max_delta_time;
 extern double am_conf_warn_delta_time;