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/*
GP2X minimal library v0.5 by rlyeh, 2005.
+ GP2X video library with double buffering.
+ GP2X soundring buffer library with double buffering.
+ GP2X joystick library.
Thanks to Squidge, Robster, snaff and NK, for the help & previous work! :-)
What's new
==========
0.5: patched sound for real stereo (using NK's solution); better init code.
0.4: lots of cleanups; sound is threaded now, double buffered too; 8 bpp video support; better exiting code.
0.3: shorter library; improved joystick diagonal detection.
0.2: better code layout; public release.
0.1: beta release
*/
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <linux/fb.h>
#include <pthread.h>
extern void gp2x_sound_frame(void *blah, void *bufferg, int samples);
enum { GP2X_UP=0x1, GP2X_LEFT=0x4, GP2X_DOWN=0x10, GP2X_RIGHT=0x40,
GP2X_START=1<<8, GP2X_SELECT=1<<9, GP2X_L=1<<10, GP2X_R=1<<11,
GP2X_A=1<<12, GP2X_B=1<<13, GP2X_X=1<<14, GP2X_Y=1<<15,
GP2X_VOL_UP=1<<22, GP2X_VOL_DOWN=1<<23, GP2X_PUSH=1<<27, };
#define gp2x_video_color15(R,G,B,A) (((R&0xF8)<<8)|((G&0xF8)<<3)|((B&0xF8)>>3)|(A<<5))
#define gp2x_video_color8 (C,R,G,B) gp2x_palette[C][0]=(G<<8)|B,gp2x_palette[C][1]=R;
unsigned long gp2x_dev[4]={0,0,0,0}, gp2x_physvram[4];
unsigned short *gp2x_memregs, *gp2x_screen15, *gp2x_logvram15[2], gp2x_sound_buffer[4+(44100*2)*4]; //*2=stereo, *4=max buffers
volatile unsigned short gp2x_palette[512][2];
unsigned char *gp2x_screen8, *gp2x_logvram8[2];
pthread_t gp2x_sound_thread=0, gp2x_sound_thread_exit=0;
void gp2x_video_flip(void)
{
unsigned long address=gp2x_physvram[gp2x_physvram[3]];
gp2x_screen15=gp2x_logvram15[gp2x_physvram[3]^=1];
gp2x_screen8 =gp2x_logvram8 [gp2x_physvram[3] ];
gp2x_memregs[0x290E>>1]=(unsigned short)(address & 0xffff);
gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16);
gp2x_memregs[0x2912>>1]=(unsigned short)(address & 0xffff);
gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16);
}
void gp2x_video_setpalette(void)
{
gp2x_memregs[0x2958>>1]=0;
for(int i=0; i<512; i++) gp2x_memregs[0x295A>>1]=gp2x_palette[i][0], gp2x_memregs[0x295A>>1]=gp2x_palette[i][1];
}
unsigned long gp2x_joystick_read(void)
{
unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);
if(value==0xFD) value=0xFA;
if(value==0xF7) value=0xEB;
if(value==0xDF) value=0xAF;
if(value==0x7F) value=0xBE;
return ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));
}
void *gp2x_sound_play(void *blah)
{
timespec ts;
int flip=0;
ts.tv_sec=0, ts.tv_nsec=gp2x_sound_buffer[2];
while(! gp2x_sound_thread_exit)
{
gp2x_sound_frame(blah, (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[0]);
write(gp2x_dev[3], (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[1]);
flip^=gp2x_sound_buffer[1];
nanosleep(&ts, NULL);
}
return NULL;
}
void gp2x_deinit(void)
{
if(gp2x_sound_thread) { gp2x_sound_thread_exit=1; for(int i=0;i<1000000;i++); }
gp2x_memregs[0x28DA>>1]=0x4AB;
gp2x_memregs[0x290C>>1]=640;
close(gp2x_dev[0]);
close(gp2x_dev[1]);
close(gp2x_dev[2]);
close(gp2x_dev[3]);
fcloseall();
chdir("/usr/gp2x");
execl("gp2xmenu",NULL);
}
void gp2x_init(int bpp, int rate, int bits, int stereo, int Hz)
{
struct fb_fix_screeninfo fixed_info;
if(!gp2x_dev[0]) gp2x_dev[0] = open("/dev/fb0", O_RDWR);
if(!gp2x_dev[1]) gp2x_dev[1] = open("/dev/fb1", O_RDWR);
if(!gp2x_dev[2]) gp2x_dev[2] = open("/dev/mem", O_RDWR);
if(!gp2x_dev[3]) gp2x_dev[3] = open("/dev/dsp", O_WRONLY);
gp2x_memregs=(unsigned short *)mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], 0xc0000000);
if(!gp2x_sound_thread) { gp2x_memregs[0x0F16>>1] = 0x830a; usleep(1000000);
gp2x_memregs[0x0F58>>1] = 0x100c; usleep(1000000); }
ioctl (gp2x_dev[0], FBIOGET_FSCREENINFO, &fixed_info);
gp2x_screen15=gp2x_logvram15[0]=(unsigned short *)mmap(0, 320*240*2, PROT_WRITE, MAP_SHARED, gp2x_dev[0], 0);
gp2x_screen8=gp2x_logvram8[0]=(unsigned char *)gp2x_logvram15[0];
gp2x_physvram[0]=fixed_info.smem_start;
ioctl (gp2x_dev[1], FBIOGET_FSCREENINFO, &fixed_info);
gp2x_logvram15[1]=(unsigned short *)mmap(0, 320*240*2, PROT_WRITE, MAP_SHARED, gp2x_dev[1], 0);
gp2x_logvram8[1]=(unsigned char *)gp2x_logvram15[1];
gp2x_physvram[1]=fixed_info.smem_start;
gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/
gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/
ioctl(gp2x_dev[3], SNDCTL_DSP_SPEED, &rate);
ioctl(gp2x_dev[3], SNDCTL_DSP_SETFMT, &bits);
ioctl(gp2x_dev[3], SNDCTL_DSP_STEREO, &stereo);
gp2x_sound_buffer[1]=(gp2x_sound_buffer[0]=(rate/Hz)) << (stereo + (bits==16));
gp2x_sound_buffer[2]=(1000000/Hz);
if(!gp2x_sound_thread) { pthread_create( &gp2x_sound_thread, NULL, gp2x_sound_play, NULL);
atexit(gp2x_deinit); }
}
/*
EXAMPLE
=======
now supply your own function for 16 bits, stereo:
void gp2x_sound_frame(void *blah, void *bufferg, int samples)
{
signed short *buffer=(signed short *)bufferg;
while(samples--)
{
*buffer++=0; //Left channel
*buffer++=0; //Right channel
}
}
or 16 bits mono:
void gp2x_sound_frame(void *blah, void *bufferg, int samples)
{
signed short *buffer=(signed short *)bufferg;
while(samples--)
{
*buffer++=0; //Central channel
}
}
now the main program...
hicolor example:
int main(int argc, char *argv[])
{
//this sets video to hicolor (16 bpp)
//it also sets sound to 44100,16bits,stereo and syncs audio to 50 Hz (PAL timing)
//Warning: GP2X does not support 8bit sound sampling! (at least within Linux)
gp2x_init(16,44100,16,1,50);
while(1)
{
unsigned long pad=gp2x_joystick_read();
unsigned short color=gp2x_video_color15(255,255,255,0);
if(pad & GP2X_L) if(pad & GP2X_R) exit();
if(pad & GP2X_A) color=gp2x_color15(255,255,255,0); //white
else color=gp2x_color15(255,0,0,0); //red
gp2x_screen15[160+120*320]=color; //x=160, y=120
gp2x_video_flip();
}
}
palettized example:
int main(int argc, char *argv[])
{
//this sets video to palette mode (8 bpp)
//it also sets sound to 11025,16bits,stereo and syncs audio to 60 Hz (NSTC timing)
//Warning: GP2X does not support 8bit sound sampling! (at least within Linux)
gp2x_init(8,11025,16,1,60);
gp2x_video_color8(0,0,0,0); //color #0 is black for us
gp2x_video_color8(1,255,255,255); //color #1 is white for us
gp2x_video_color8(2,255,0,0); //color #2 is red for us
gp2x_video_setpalette();
while(1)
{
unsigned long pad=gp2x_joystick_read();
unsigned char color;
if(pad & GP2X_L) if(pad & GP2X_R) exit();
if(pad & GP2X_A) color=1; //white
else color=2; //red
gp2x_screen8[160+120*320]=color; //x=160, y=120
gp2x_video_flip();
}
}
*/