Avoid drawing the whole screen on each frame

This allows supporting 386DX "just about" (there will be flickering).

1 files changed, 5 insertions, 10 deletions

diff --git a/src/map.c b/src/map.c
index e5e67d1..5599ae9 100644
--- a/src/map.c
+++ b/src/map.c
@@ -74,8 +74,8 @@ void map_init(const uint8_t map[])
         }
 #endif
 
-        e->x = ent[1] * MAP_TILE_W;
-        e->y = ent[2] * MAP_TILE_H;
+        e->ox = e->x = ent[1] * MAP_TILE_W;
+        e->oy = e->y = ent[2] * MAP_TILE_H;
         e->dir = ent[3] & 1;
 
         init[*ent - 1](e);
@@ -98,15 +98,8 @@ void map_render()
             src.y = (t / MAP_TILESET_COLS) * MAP_TILE_H;
 
             blitrc(binary_tiles_start, &src, &dst);
-        }
-
-    for (uint8_t y = 0; y < MAP_H; y++)
-        for (uint8_t x = 0; x < MAP_W; x++)
-        {
-            dst.x = x * MAP_TILE_W;
-            dst.y = y * MAP_TILE_H + MAP_OFFS_Y;
 
-            uint8_t t = gold[x + y * MAP_W];
+            t = gold[x + y * MAP_W];
 
             /* not gold, skip! */
             if (t == 0xff)
@@ -150,7 +143,9 @@ uint8_t map_update_gold(uint16_t x, uint16_t y)
         src.x = (t % MAP_TILESET_COLS) * MAP_TILE_W;
         src.y = (t / MAP_TILESET_COLS) * MAP_TILE_H;
 
+        blit_target(TARGET_BUFFER);
         blitrc(binary_tiles_start, &src, &dst);
+        blit_target(TARGET_SCREEN);
 
         total_gold--;
         return 1;