mirror of
https://github.com/knightfox75/nds_nflib.git
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113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
// SPDX-License-Identifier: MIT
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//
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// Copyright (c) 2009-2014 Cesar Rincon "NightFox"
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// Copyright (c) 2023 Antonio Niño Díaz "AntonioND"
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//
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// NightFox LIB - Mixed (tiled and 8-bit bitmap) background functions
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// http://www.nightfoxandco.com/
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#include <string.h>
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#include <nds.h>
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#include "nf_2d.h"
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#include "nf_basic.h"
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#include "nf_bitmapbg.h"
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#include "nf_mixedbg.h"
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#include "nf_tiledbg.h"
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void NF_InitMixedBgSys(int screen)
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{
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// Define the number of banks of maps and tiles.
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//
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// Tile banks are 16 KB in size. Map banks are 2 KB in size. You can fit 8
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// map banks in a tile bank. For that reason, the number of map banks must
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// be a multiple of 8 banks.
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//
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// By default, use 4 tile banks and 8 map banks.
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NF_BANKS_TILES[screen] = 4;
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NF_BANKS_MAPS[screen] = 8;
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// Set all tile and map blocks as free
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for (int n = 0; n < NF_BANKS_TILES[screen]; n++)
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NF_TILEBLOCKS[screen][n] = 0;
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for (int n = 0; n < NF_BANKS_MAPS[screen]; n++)
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NF_MAPBLOCKS[screen][n] = 0;
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// Reset information of backgrounds
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for (int n = 0; n < 4; n ++)
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{
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NF_TILEDBG_LAYERS[screen][n].tilebase = 0; // Tileset base
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NF_TILEDBG_LAYERS[screen][n].tileblocks = 0; // Blocks used by the tileset
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NF_TILEDBG_LAYERS[screen][n].mapbase = 0; // Map base
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NF_TILEDBG_LAYERS[screen][n].mapblocks = 0; // Blocks used by the map
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NF_TILEDBG_LAYERS[screen][n].bgwidth = 0; // Background width
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NF_TILEDBG_LAYERS[screen][n].bgheight = 0; // Background height
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NF_TILEDBG_LAYERS[screen][n].mapwidth = 0; // Map width
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NF_TILEDBG_LAYERS[screen][n].mapheight = 0; // Map height
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NF_TILEDBG_LAYERS[screen][n].bgtype = 0; // Map type
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NF_TILEDBG_LAYERS[screen][n].bgslot = 0; // Graphics slot
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NF_TILEDBG_LAYERS[screen][n].blockx = 0; // Current horizontal map block
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NF_TILEDBG_LAYERS[screen][n].blocky = 0; // Current vertical map block
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NF_TILEDBG_LAYERS[screen][n].created = false; // Is the background created?
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}
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// Now reserve as many VRAM banks as needed for maps. Each tile map is as
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// big as 8 map banks.
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// Number of required tile maps to reserve for maps
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u8 r_banks = ((NF_BANKS_MAPS[screen] - 1) / 8) + 1;
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for (int n = 0; n < r_banks; n ++)
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NF_TILEBLOCKS[screen][n] = 128; // Flag them as "map" banks
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if (screen == 0)
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{
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// Top screen, main engine
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REG_DISPCNT |= DISPLAY_BG_EXT_PALETTE; // Enable extended palettes
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vramSetBankA(VRAM_A_MAIN_BG); // VRAM_A: Main engine backgrounds (128 KB)
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memset((void *)0x06000000, 0, 131072); // Clear VRAM_A
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vramSetBankE(VRAM_E_LCD); // VRAM_E: Extended palettes (32 / 64 KB)
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memset((void *)0x06880000, 0, 32768); // Clear VRAM_E
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for (int n = 0; n < 4; n++) // Hide all 4 layers
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NF_HideBg(0, n);
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}
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else
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{
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// Bottom screen, sub engine
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REG_DISPCNT_SUB |= DISPLAY_BG_EXT_PALETTE; // Enable extended palettes
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vramSetBankC(VRAM_C_SUB_BG); // VRAM_C: Sub engine backgrounds (128 KB)
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memset((void *)0x06200000, 0, 131072); // Clear VRAM_C
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vramSetBankH(VRAM_H_LCD); // VRAM_H: Extended palettes (32 / 64 KB)
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memset((void *)0x06898000, 0, 32768); // Clear VRAM_H
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for (int n = 0; n < 4; n++) // Hide all 4 layers
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NF_HideBg(1, n);
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}
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// Initialize the drawing layer for bitmaps (layer 3)
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if (screen == 0)
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{
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// Set layer 3 to 8 bits mode
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REG_BG3CNT = BG_PRIORITY_3 | BG_BMP_BASE(4) | BG_BMP8_256x256;
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// Reset rotation/scaling
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REG_BG3PA = 1 << 8;
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REG_BG3PB = 0;
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REG_BG3PC = 0;
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REG_BG3PD = 1 << 8;
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NF_ScrollBg(0, 3, 0, 0); // Reset scroll
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NF_ShowBg(0, 3); // Show layer 3
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}
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else
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{
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// Set layer 3 to 8 bits mode
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REG_BG3CNT_SUB = BG_PRIORITY_3 | BG_BMP_BASE(4) | BG_BMP8_256x256;
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// Reset rotation/scaling
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REG_BG3PA_SUB = 1 << 8;
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REG_BG3PB_SUB = 0;
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REG_BG3PC_SUB = 0;
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REG_BG3PD_SUB = 1 << 8;
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NF_ScrollBg(1, 3, 0, 0); // Reset scroll
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NF_ShowBg(1, 3); // Show layer 3
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}
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}
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