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Diffstat (limited to 'gp2x/gp2xminilib.c')
| -rw-r--r-- | gp2x/gp2xminilib.c | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/gp2x/gp2xminilib.c b/gp2x/gp2xminilib.c new file mode 100644 index 0000000..098da6b --- /dev/null +++ b/gp2x/gp2xminilib.c @@ -0,0 +1,242 @@ + +/* + 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 <stdlib.h> +#include <stdio.h> +#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> +#include "gp2xminilib.h" + +extern void gp2x_sound_frame(void *blah, void *bufferg, int samples); + + + + 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) +{int i; + gp2x_memregs[0x2958>>1]=0; + for(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)); +} + +#if 0 +void *gp2x_sound_play(void *blah) +{ + struct 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; +} +#endif + +void gp2x_deinit(void) +{int i; + if(gp2x_sound_thread) { gp2x_sound_thread_exit=1; for(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(); +} + +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; sleep(1); + gp2x_memregs[0x0F58>>1] = 0x100c; sleep(1); } + + 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) { gp2x_sound_thread = 1; //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(); + } + } + +*/ + |