/* 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 #include #include #include #include #include #include #include #include #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(); } } */