gpsp/bios/source/logo.c

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/*
Custom GBA BIOS replacement
Copyright (c) 2002-2006 VBA Development Team
Copyright (c) 2006-2013 VBA-M Development Team
Copyright (c) 2013 Normmatt
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <tonc.h>
#include "logo_data.h"
static inline void CPUWriteHalfWord(u32 adr, u16 val)
{
*(u16*)adr = val;
}
static inline u16 CPUReadHalfWord(u32 adr)
{
return *(u16*)adr;
}
void memcpy_(u32 source, u32 dest, int count)
{
// copy
while(count) {
CPUWriteHalfWord(dest, (source>0x0EFFFFFF ? 0x1CAD : CPUReadHalfWord(source)));
dest += 2;
source += 2;
count--;
}
}
extern void swi_LZ77UnCompVram_(u32 source, u32 dest, int checkBios);
extern void swi_RegisterRamReset(u32 flags);
/*-----------------------------------------------------------------
DrawLogo
Draws a custom logo and pauses for a second or two.
-----------------------------------------------------------------*/
void DrawLogo() {
// Load palette
memcpy_((u32)logo_dataPal, (u32)pal_bg_mem, logo_dataPalLen);
// Load tiles into CBB 0
swi_LZ77UnCompVram_((u32)logo_dataTiles, (u32)&tile_mem[0][0], 0);
// Load map into SBB 30
swi_LZ77UnCompVram_((u32)logo_dataMap, (u32)&se_mem[30][0], 0);
// set up BG0 for a 4bpp 64x32t map, using
// using charblock 0 and screenblock 31
REG_BG0CNT= BG_CBB(0) | BG_SBB(30) | BG_4BPP | BG_REG_32x32;
REG_DISPCNT= DCNT_MODE0 | DCNT_BG0;
int countdown = 60*2;
while(countdown--)
{
vid_vsync();
}
swi_RegisterRamReset(0xFF);
}