243 lines
6.8 KiB
C
243 lines
6.8 KiB
C
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/*
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GP2X minimal library v0.5 by rlyeh, 2005.
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+ GP2X video library with double buffering.
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+ GP2X soundring buffer library with double buffering.
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+ GP2X joystick library.
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Thanks to Squidge, Robster, snaff and NK, for the help & previous work! :-)
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What's new
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==========
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0.5: patched sound for real stereo (using NK's solution); better init code.
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0.4: lots of cleanups; sound is threaded now, double buffered too; 8 bpp video support; better exiting code.
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0.3: shorter library; improved joystick diagonal detection.
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0.2: better code layout; public release.
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0.1: beta release
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/soundcard.h>
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#include <linux/fb.h>
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#include <pthread.h>
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#include "gp2xminilib.h"
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extern void gp2x_sound_frame(void *blah, void *bufferg, int samples);
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unsigned long gp2x_dev[4]={0,0,0,0}, gp2x_physvram[4];
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unsigned short *gp2x_memregs, *gp2x_screen15, *gp2x_logvram15[2], gp2x_sound_buffer[4+(44100*2)*4]; //*2=stereo, *4=max buffers
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volatile unsigned short gp2x_palette[512][2];
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unsigned char *gp2x_screen8, *gp2x_logvram8[2];
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pthread_t gp2x_sound_thread=0, gp2x_sound_thread_exit=0;
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void gp2x_video_flip(void)
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{
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unsigned long address=gp2x_physvram[gp2x_physvram[3]];
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gp2x_screen15=gp2x_logvram15[gp2x_physvram[3]^=1];
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gp2x_screen8 =gp2x_logvram8 [gp2x_physvram[3] ];
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gp2x_memregs[0x290E>>1]=(unsigned short)(address & 0xffff);
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gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16);
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gp2x_memregs[0x2912>>1]=(unsigned short)(address & 0xffff);
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gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16);
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}
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void gp2x_video_setpalette(void)
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{int i;
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gp2x_memregs[0x2958>>1]=0;
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for(i=0; i<512; i++) gp2x_memregs[0x295A>>1]=gp2x_palette[i][0], gp2x_memregs[0x295A>>1]=gp2x_palette[i][1];
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}
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unsigned long gp2x_joystick_read(void)
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{
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unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF);
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if(value==0xFD) value=0xFA;
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if(value==0xF7) value=0xEB;
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if(value==0xDF) value=0xAF;
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if(value==0x7F) value=0xBE;
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return ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16));
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}
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#if 0
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void *gp2x_sound_play(void *blah)
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{
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struct timespec ts;
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int flip=0;
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ts.tv_sec=0, ts.tv_nsec=gp2x_sound_buffer[2];
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while(! gp2x_sound_thread_exit)
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{
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gp2x_sound_frame(blah, (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[0]);
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write(gp2x_dev[3], (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[1]);
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flip^=gp2x_sound_buffer[1];
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//nanosleep(&ts, NULL);
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}
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return NULL;
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}
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#endif
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void gp2x_deinit(void)
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{int i;
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if(gp2x_sound_thread) { gp2x_sound_thread_exit=1; for(i=0;i<1000000;i++); }
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gp2x_memregs[0x28DA>>1]=0x4AB;
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gp2x_memregs[0x290C>>1]=640;
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close(gp2x_dev[0]);
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close(gp2x_dev[1]);
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close(gp2x_dev[2]);
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//close(gp2x_dev[3]);
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//fcloseall();
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}
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void gp2x_init(int bpp, int rate, int bits, int stereo, int Hz)
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{
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struct fb_fix_screeninfo fixed_info;
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if(!gp2x_dev[0]) gp2x_dev[0] = open("/dev/fb0", O_RDWR);
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if(!gp2x_dev[1]) gp2x_dev[1] = open("/dev/fb1", O_RDWR);
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if(!gp2x_dev[2]) gp2x_dev[2] = open("/dev/mem", O_RDWR);
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//if(!gp2x_dev[3]) gp2x_dev[3] = open("/dev/dsp", O_WRONLY);
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gp2x_memregs=(unsigned short *)mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], 0xc0000000);
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if(!gp2x_sound_thread) { gp2x_memregs[0x0F16>>1] = 0x830a; sleep(1);
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gp2x_memregs[0x0F58>>1] = 0x100c; sleep(1); }
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ioctl (gp2x_dev[0], FBIOGET_FSCREENINFO, &fixed_info);
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gp2x_screen15=gp2x_logvram15[0]=(unsigned short *)mmap(0, 320*240*2, PROT_WRITE, MAP_SHARED, gp2x_dev[0], 0);
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gp2x_screen8=gp2x_logvram8[0]=(unsigned char *)gp2x_logvram15[0];
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gp2x_physvram[0]=fixed_info.smem_start;
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ioctl (gp2x_dev[1], FBIOGET_FSCREENINFO, &fixed_info);
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gp2x_logvram15[1]=(unsigned short *)mmap(0, 320*240*2, PROT_WRITE, MAP_SHARED, gp2x_dev[1], 0);
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gp2x_logvram8[1]=(unsigned char *)gp2x_logvram15[1];
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gp2x_physvram[1]=fixed_info.smem_start;
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gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/
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gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/
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ioctl(gp2x_dev[3], SNDCTL_DSP_SPEED, &rate);
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ioctl(gp2x_dev[3], SNDCTL_DSP_SETFMT, &bits);
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ioctl(gp2x_dev[3], SNDCTL_DSP_STEREO, &stereo);
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gp2x_sound_buffer[1]=(gp2x_sound_buffer[0]=(rate/Hz)) << (stereo + (bits==16));
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gp2x_sound_buffer[2]=(1000000/Hz);
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if(!gp2x_sound_thread) { gp2x_sound_thread = 1; //pthread_create( &gp2x_sound_thread, NULL, gp2x_sound_play, NULL);
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atexit(gp2x_deinit); }
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}
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/*
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EXAMPLE
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=======
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now supply your own function for 16 bits, stereo:
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void gp2x_sound_frame(void *blah, void *bufferg, int samples)
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{
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signed short *buffer=(signed short *)bufferg;
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while(samples--)
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{
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*buffer++=0; //Left channel
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*buffer++=0; //Right channel
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}
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}
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or 16 bits mono:
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void gp2x_sound_frame(void *blah, void *bufferg, int samples)
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{
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signed short *buffer=(signed short *)bufferg;
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while(samples--)
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{
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*buffer++=0; //Central channel
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}
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}
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now the main program...
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hicolor example:
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int main(int argc, char *argv[])
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{
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//this sets video to hicolor (16 bpp)
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//it also sets sound to 44100,16bits,stereo and syncs audio to 50 Hz (PAL timing)
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//Warning: GP2X does not support 8bit sound sampling! (at least within Linux)
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gp2x_init(16,44100,16,1,50);
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while(1)
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{
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unsigned long pad=gp2x_joystick_read();
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unsigned short color=gp2x_video_color15(255,255,255,0);
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if(pad & GP2X_L) if(pad & GP2X_R) exit();
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if(pad & GP2X_A) color=gp2x_color15(255,255,255,0); //white
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else color=gp2x_color15(255,0,0,0); //red
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gp2x_screen15[160+120*320]=color; //x=160, y=120
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gp2x_video_flip();
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}
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}
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palettized example:
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int main(int argc, char *argv[])
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{
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//this sets video to palette mode (8 bpp)
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//it also sets sound to 11025,16bits,stereo and syncs audio to 60 Hz (NSTC timing)
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//Warning: GP2X does not support 8bit sound sampling! (at least within Linux)
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gp2x_init(8,11025,16,1,60);
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gp2x_video_color8(0,0,0,0); //color #0 is black for us
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gp2x_video_color8(1,255,255,255); //color #1 is white for us
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gp2x_video_color8(2,255,0,0); //color #2 is red for us
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gp2x_video_setpalette();
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while(1)
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{
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unsigned long pad=gp2x_joystick_read();
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unsigned char color;
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if(pad & GP2X_L) if(pad & GP2X_R) exit();
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if(pad & GP2X_A) color=1; //white
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else color=2; //red
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gp2x_screen8[160+120*320]=color; //x=160, y=120
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gp2x_video_flip();
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}
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}
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*/
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