add alternate to interp callbacks, flags on the leafdraw

src/m_Do/m_Do_main.cpp

@@ -70,6 +70,7 @@
 #include "dusk/config.hpp"
 #include "dusk/imgui/ImGuiConsole.hpp"
 #include "tracy/Tracy.hpp"
+#include "f_pc/f_pc_draw.h"
 
 // --- GLOBALS ---
 s8 mDoMain::developmentMode = -1;
@@ -233,8 +234,8 @@ void main01(void) {
 
         mDoGph_gInf_c::updateRenderSize();
 
+        dusk::frame_interp::begin_frame(pacing.is_interpolating, pacing.do_sim_tick, pacing.interpolation_step);
         if (pacing.is_interpolating) {
-            dusk::frame_interp::begin_frame(pacing.do_sim_tick, pacing.interpolation_step);
             if (pacing.do_sim_tick) {
                 dusk::frame_interp::set_ui_tick_pending(true);
                 mDoCPd_c::read();
@@ -242,6 +243,9 @@ void main01(void) {
                 fapGm_Execute();
                 mDoAud_Execute();
                 dusk::game_clock::reset_accumulator();
+            } else {
+                // run draw functions for anything specially marked to handle interp on non-sim ticks
+                fpcM_DrawIterater((fpcM_DrawIteraterFunc)fpcM_Draw);
             }
             dusk::frame_interp::interpolate();
             {