From 8871729a65615df0eab213bbbf942abe75771704 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Sat, 8 Jul 2023 22:35:16 +0100
Subject: Avoid drawing the whole screen on each frame

This allows supporting 386DX "just about" (there will be flickering).
---
 src/game.c | 54 ++++++++++++++++++++++++++----------------------------
 1 file changed, 26 insertions(+), 28 deletions(-)

(limited to 'src/game.c')

diff --git a/src/game.c b/src/game.c
index ba6ee85..67f7739 100644
--- a/src/game.c
+++ b/src/game.c
@@ -91,7 +91,7 @@ static void hud_render()
         sprintf(b, "%02d", time);
         put_text(172, 4, b, time > 10 || stageclear ? 1 : 15);
         if (!gameover && !stageclear && time <= 10)
-            sound_queue_efx(EFX_TIME);
+            sound_play_efx(EFX_TIME);
     }
 
     if (hud & HUD_STAGE)
@@ -105,6 +105,8 @@ static void hud_render()
 
 static void run_gameover()
 {
+    wait_vsync();
+
     blit_erase(0);
 
     /* restore the HUD after erasing the screen */
@@ -113,19 +115,14 @@ static void run_gameover()
 
     put_text(124, 90, "GAME OVER", 1);
 
-    wait_vsync();
-    blit_update();
-
     /* wait some time */
     wait_frames(255);
 }
 
 static void run_stageclear()
 {
-    put_text(116, 100, "STAGE CLEAR", 1);
-
     wait_vsync();
-    blit_update();
+    put_text(116, 100, "STAGE CLEAR", 1);
 
     /* wait some time */
     wait_frames(96);
@@ -135,23 +132,24 @@ static void run_stageclear()
         add_score(25);
         time--;
         hud |= HUD_TIME;
-        sound_queue_efx(EFX_GOLD);
-        hud_render();
 
         wait_frames(4);
-        blit_update();
-        sound_play_queue();
+
+        wait_vsync();
+        hud_render();
+        sound_play_efx(EFX_GOLD);
     }
 
     /* wait some time */
     wait_frames(64);
 
+    wait_vsync();
     blit_erase(0);
+
     /* restore the HUD after erasing the screen */
     hud = HUD_ALL;
-    hud_render();
     wait_vsync();
-    blit_update();
+    hud_render();
 
     wait_frames(32);
 }
@@ -173,25 +171,30 @@ next_stage:
 
     tmonster = NULL;
 
+    blit_target(TARGET_BUFFER);
     blit_erase(0);
 
     map_init(binary_stage_start);
 
-    /* render the scene with the READY? text */
     map_render();
-    entities_draw();
-    player_draw();
     hud_render();
-    put_text(136, 100, "READY?", 1);
 
     wait_vsync();
-    blit_update();
+    blit_copy_all();
+
+    blit_target(TARGET_SCREEN);
+    put_text(136, 100, "READY?", 1);
+
+    entities_draw();
+    player_draw();
 
     /* wait some time */
     wait_frames(96);
 
     /* erase the READY? text */
-    map_render();
+    wait_vsync();
+    blit_copy_all();
+
     entities_draw();
     player_draw();
 
@@ -226,10 +229,6 @@ next_stage:
         if (pause)
             continue;
 
-        /* erase first the last we draw */
-        player_erase();
-        entities_erase();
-
         if (map_is_complete())
         {
             if (!stageclear)
@@ -237,7 +236,7 @@ next_stage:
                 timer_stop();
                 tmonster = NULL;
                 entities_warp_out_all();
-                sound_queue_efx(EFX_WARP);
+                sound_play_efx(EFX_WARP);
 
                 stageclear = STAGECLEAR_DELAY;
             }
@@ -271,13 +270,12 @@ next_stage:
 
         entities_update();
 
+        wait_vsync();
+
+        player_erase();
         entities_draw();
         player_draw();
 
-        wait_vsync();
-        blit_update();
-        sound_play_queue();
-
         if (gameover)
         {
             gameover--;
-- 
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