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/player.c | 48 +++++++++++++++++++++++++++++-------------------
 1 file changed, 29 insertions(+), 19 deletions(-)

(limited to 'src/player.c')

diff --git a/src/player.c b/src/player.c
index 8c1765a..399dacf 100644
--- a/src/player.c
+++ b/src/player.c
@@ -24,20 +24,18 @@
 
 #define IS_NOT_GOING_UP(x) (gravity == GRAVITY_OFF || (x)>=GRAVITY_DOWN)
 
-static uint16_t x, y;
+static uint16_t x, y, ox, oy, erase;
 static uint8_t dir, frame, delay, gravity, jump, momentum;
 
 static uint16_t respawn_x, respawn_y;
 static uint8_t respawn_dir;
 
-static uint8_t invuln, dying;
+static uint8_t invuln, dying, dead;
 
 const uint8_t gravity_seq[GRAVITY_SEQ_LEN] = {
     6, 4, 4, 2, 2, 2, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 4
 };
 
-static uint8_t bg[256];
-
 static const Rect frames[2][6] =
 {
     {
@@ -77,9 +75,11 @@ void player_init(uint16_t start_x, uint8_t start_y, uint8_t start_dir)
     momentum = 0;
     invuln = 0;
     dying = 0;
+    dead = 0;
+    erase = 0;
 
-    respawn_x = x = start_x;
-    respawn_y = y = start_y;
+    respawn_x = ox = x = start_x;
+    respawn_y = oy = y = start_y;
     gravity = GRAVITY_OFF;
 }
 
@@ -97,17 +97,20 @@ static void player_dying()
                 /* exit screen */
                 if (y == MAP_H * MAP_TILE_H - 16)
                 {
+                    /* oh, well */
+                    player_erase();
+
                     /* if there are lifes left, respawn */
                     if (dec_lives())
                     {
                         player_init(respawn_x, respawn_y, respawn_dir);
                         invuln = INVULN_TIME;
                     }
+                    else
+                        dead = 1;
 
                     /* stop falling */
                     gravity = GRAVITY_OFF;
-                    /* don't draw the player; XXX: magic number */
-                    invuln = 4;
                     return;
                 }
                 y++;
@@ -131,6 +134,9 @@ void player_update()
 {
     uint8_t moved = 0;
 
+    ox = x;
+    oy = y;
+
     if (dying)
     {
         player_dying();
@@ -160,7 +166,7 @@ void player_update()
             momentum = 0;
             frame = FRAME_JUMPING;
             gravity = GRAVITY_UP;
-            sound_queue_efx(EFX_JUMP);
+            sound_play_efx(EFX_JUMP);
         }
     }
     else
@@ -273,26 +279,30 @@ void player_update()
     if (map_update_gold(x + (dir == DIR_LEFT ? 7 : 8), y + 15))
     {
         add_score(10);
-        sound_queue_efx(EFX_GOLD);
+        sound_play_efx(EFX_GOLD);
     }
 }
 
 void player_erase()
 {
-    Rect dst = { x, y + MAP_OFFS_Y, 16, 16 };
-    blit(bg, &dst);
+    if (!erase)
+        return;
+
+    Rect dst = { ox, oy + MAP_OFFS_Y, 16, 16 };
+    blit_copy(&dst);
+
+    erase = 0;
 }
 
 void player_draw()
 {
-    Rect dst = { x, y + MAP_OFFS_Y, 16, 16 };
-
-    read_buffer(bg, &dst);
-
-    if (invuln && (invuln & 4))
+    if (dead || (invuln && (invuln & 4)))
         return;
 
+    Rect dst = { x, y + MAP_OFFS_Y, 16, 16 };
     blitrc(binary_sprites_start, &frames[dir][frame], &dst);
+
+    erase = 1;
 }
 
 uint8_t player_collision(Entity *e)
@@ -320,14 +330,14 @@ void player_hit()
     if (use_pickaxe())
     {
         invuln = INVULN_TIME;
-        sound_queue_efx(EFX_HIT);
+        sound_play_efx(EFX_HIT);
     }
     else
     {
         dying = 1;
         frame = FRAME_DYING;
         gravity = GRAVITY_UP;
-        sound_queue_efx(EFX_DEATH);
+        sound_play_efx(EFX_DEATH);
     }
 }
 
-- 
cgit v1.2.3