Continuing graphics work

source/background_engine.cpp

@@ -1,74 +1,20 @@
 #include <tonc.h>
-#define CBB_0 0
-#define SBB_0 28
+#include <cstring>
 
-#define CROSS_TX 15
-#define CROSS_TY 10
+#include "sprite_data.h"
 
-uint frame_count = 0;
+#define CBB 0
+#define SBB 24
+int x, y;
 
-BG_POINT bg0_pt = {0, 0};
-SCR_ENTRY *bg0_map = se_mem[SBB_0];
-
-u32 tx, ty, se_curr, se_prev;
-
-uint se_index(uint tx, uint ty, uint pitch)
+void background_frame()
 {
-    uint sbb = ((tx >> 5) + (ty >> 5) * (pitch >> 5));
-    return sbb * 1024 + ((tx & 31) + (ty & 31) * 32);
-}
+     vid_vsync();
+        key_poll();
 
-void init_map()
-{
-    int ii, jj;
+        x += key_tri_horz();
+        y += key_tri_vert();
 
-    // initialize a background
-    REG_BG0CNT = BG_CBB(CBB_0) | BG_SBB(SBB_0) | BG_REG_64x64;
-    REG_BG0HOFS = 0;
-    REG_BG0VOFS = 0;
-
-    // (1) create the tiles:
-    const TILE tile =
-        {
-            {0x11111111, 0x01111111, 0x01111111, 0x01111111,
-             0x01111111, 0x01111111, 0x01111111, 0x00000001}};
-    tile_mem[CBB_0][0] = tile;
-
-    // (2) create a palette
-    pal_bg_bank[0][1] = RGB15(31, 0, 0);
-
-    // (3) Create a map:
-    SCR_ENTRY *pse = bg0_map;
-    for (jj = 0; jj < 32 * 32; jj++)
-        *pse++ = SE_PALBANK(ii) | 0;
-}
-
-int back_main()
-{
-    init_map();
-    return 0;
-}
-
-void back_frame()
-{
-    vid_vsync();
-
-    key_poll();
-
-    // (4) Moving around
-    if (frame_count % 2 == 0)
-    {
-        bg0_pt.x += 1;
-        bg0_pt.y += 1;
-    }
-    se_curr = se_index(tx, ty, 64);
-    if (se_curr != se_prev)
-    {
-        bg0_map[se_prev]--;
-        bg0_map[se_curr]++;
-        se_prev = se_curr;
-    }
-
-    REG_BG_OFS[0] = bg0_pt; // write new position
-    frame_count++;
+        REG_BG0HOFS= x;
+        REG_BG0VOFS= y;
 }