mirror of
https://github.com/knightfox75/nds_nflib.git
synced 2025-06-18 16:55:32 -04:00
e1506cc74f
Types like u8 and u16 aren't always a good idea. For example:
void function(u8 x, u8 y)
{
u32 value = (x << 16) | y;
}
The left shift of x will overflow because x is 8 bits wide. It is better
to make both arguments 32 bit wide.
It may also cause the compiler to introduce bit masking operations at
the caller side because the caller doesn't know how the function
behaves internally.
In order to prevent this kind of issues, it's better to use 32 bit
variables unless there is a very good reason to use smaller types (like
in structs, to save RAM).
112 lines
4.2 KiB
C
112 lines
4.2 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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//
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// NightFox LIB - Include de Fondos mixtos (Tiled / Bitmap 8 bits)
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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) >> 3) + 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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