Enable drawing of backgroud tiles.

src/core/gba/gfx.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016 gtalent2@gmail.com
+ * Copyright 2016-2017 gtalent2@gmail.com
  *
  * This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -8,17 +8,46 @@
 
 #include <ox/std/types.hpp>
 #include "registers.hpp"
+#include "dirt.h"
 
 namespace nostalgia {
 namespace core {
 
+using namespace ox::std;
+
+typedef struct { uint32_t data[8]; } Tile, Tile4;
+// d-tile: double-sized tile (8bpp)
+typedef struct { uint32_t data[16]; } Tile8;
+// tile block: 32x16 tiles, 16x16 d-tiles
+typedef struct { unsigned short data[256]; } Pallete;
+typedef Tile  CharBlock[512];
+typedef Tile8 CharBlock8[256];
+
+#define TILE_ADDR  ((CharBlock*) 0x06000000)
+#define TILE8_ADDR ((CharBlock8*) 0x06000000)
+
+#define PALLETE_BG     ((unsigned short*) 0x05000000)
+#define PALLETE_SPRITE ((unsigned short*) 0x05000200)
+
+typedef uint16_t BgMapTile[1024];
+#define BG_MAP ((BgMapTile*) 0x06000000)
+
 ox::std::Error initGfx() {
 	/* Sprite Mode ----\ */
 	/*             ---\| */
-	/* Background 2 -\|| */
+	/* Background 0 -\|| */
 	/* Objects -----\||| */
 	/*              |||| */
-	REG_DISPCNT = 0x1400;
+	REG_DISPCNT = 0x1100;
+
+	TILE_ADDR[0][1] = *(Tile*) dirtTiles;
+
+	for (auto i = 0; i < (dirtPalLen / 2); i++) {
+		PALLETE_BG[i] = dirtPal[i];
+	}
+
+	BG_MAP[28][52] = 1;
+	REG_BG0CNT = (28 << 8) | 1;
 
 	return 0;
 }