| 1 | |
| 2 | /* |
| 3 | GP2X minimal library v0.5 by rlyeh, 2005. |
| 4 | |
| 5 | + GP2X video library with double buffering. |
| 6 | + GP2X soundring buffer library with double buffering. |
| 7 | + GP2X joystick library. |
| 8 | |
| 9 | Thanks to Squidge, Robster, snaff and NK, for the help & previous work! :-) |
| 10 | |
| 11 | |
| 12 | What's new |
| 13 | ========== |
| 14 | |
| 15 | 0.5: patched sound for real stereo (using NK's solution); better init code. |
| 16 | |
| 17 | 0.4: lots of cleanups; sound is threaded now, double buffered too; 8 bpp video support; better exiting code. |
| 18 | |
| 19 | 0.3: shorter library; improved joystick diagonal detection. |
| 20 | |
| 21 | 0.2: better code layout; public release. |
| 22 | |
| 23 | 0.1: beta release |
| 24 | */ |
| 25 | |
| 26 | #include <stdlib.h> |
| 27 | #include <stdio.h> |
| 28 | #include <unistd.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <sys/mman.h> |
| 31 | #include <sys/ioctl.h> |
| 32 | #include <sys/soundcard.h> |
| 33 | #include <linux/fb.h> |
| 34 | #include <pthread.h> |
| 35 | #include "gp2xminilib.h" |
| 36 | |
| 37 | extern void gp2x_sound_frame(void *blah, void *bufferg, int samples); |
| 38 | |
| 39 | |
| 40 | |
| 41 | unsigned long gp2x_dev[4]={0,0,0,0}, gp2x_physvram[4]; |
| 42 | unsigned short *gp2x_memregs, *gp2x_screen15, *gp2x_logvram15[2], gp2x_sound_buffer[4+(44100*2)*4]; //*2=stereo, *4=max buffers |
| 43 | volatile unsigned short gp2x_palette[512][2]; |
| 44 | unsigned char *gp2x_screen8, *gp2x_logvram8[2]; |
| 45 | pthread_t gp2x_sound_thread=0, gp2x_sound_thread_exit=0; |
| 46 | |
| 47 | void gp2x_video_flip(void) |
| 48 | { |
| 49 | unsigned long address=gp2x_physvram[gp2x_physvram[3]]; |
| 50 | |
| 51 | gp2x_screen15=gp2x_logvram15[gp2x_physvram[3]^=1]; |
| 52 | gp2x_screen8 =gp2x_logvram8 [gp2x_physvram[3] ]; |
| 53 | |
| 54 | gp2x_memregs[0x290E>>1]=(unsigned short)(address & 0xffff); |
| 55 | gp2x_memregs[0x2910>>1]=(unsigned short)(address >> 16); |
| 56 | gp2x_memregs[0x2912>>1]=(unsigned short)(address & 0xffff); |
| 57 | gp2x_memregs[0x2914>>1]=(unsigned short)(address >> 16); |
| 58 | } |
| 59 | |
| 60 | void gp2x_video_setpalette(void) |
| 61 | {int i; |
| 62 | gp2x_memregs[0x2958>>1]=0; |
| 63 | for(i=0; i<512; i++) gp2x_memregs[0x295A>>1]=gp2x_palette[i][0], gp2x_memregs[0x295A>>1]=gp2x_palette[i][1]; |
| 64 | } |
| 65 | |
| 66 | unsigned long gp2x_joystick_read(void) |
| 67 | { |
| 68 | unsigned long value=(gp2x_memregs[0x1198>>1] & 0x00FF); |
| 69 | |
| 70 | if(value==0xFD) value=0xFA; |
| 71 | if(value==0xF7) value=0xEB; |
| 72 | if(value==0xDF) value=0xAF; |
| 73 | if(value==0x7F) value=0xBE; |
| 74 | |
| 75 | return ~((gp2x_memregs[0x1184>>1] & 0xFF00) | value | (gp2x_memregs[0x1186>>1] << 16)); |
| 76 | } |
| 77 | |
| 78 | #if 0 |
| 79 | void *gp2x_sound_play(void *blah) |
| 80 | { |
| 81 | struct timespec ts; |
| 82 | int flip=0; |
| 83 | |
| 84 | ts.tv_sec=0, ts.tv_nsec=gp2x_sound_buffer[2]; |
| 85 | |
| 86 | while(! gp2x_sound_thread_exit) |
| 87 | { |
| 88 | gp2x_sound_frame(blah, (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[0]); |
| 89 | write(gp2x_dev[3], (void *)(&gp2x_sound_buffer[4+flip]), gp2x_sound_buffer[1]); |
| 90 | |
| 91 | flip^=gp2x_sound_buffer[1]; |
| 92 | |
| 93 | //nanosleep(&ts, NULL); |
| 94 | } |
| 95 | |
| 96 | return NULL; |
| 97 | } |
| 98 | #endif |
| 99 | |
| 100 | void gp2x_deinit(void) |
| 101 | {int i; |
| 102 | if(gp2x_sound_thread) { gp2x_sound_thread_exit=1; for(i=0;i<1000000;i++); } |
| 103 | |
| 104 | gp2x_memregs[0x28DA>>1]=0x4AB; |
| 105 | gp2x_memregs[0x290C>>1]=640; |
| 106 | |
| 107 | close(gp2x_dev[0]); |
| 108 | close(gp2x_dev[1]); |
| 109 | close(gp2x_dev[2]); |
| 110 | //close(gp2x_dev[3]); |
| 111 | //fcloseall(); |
| 112 | } |
| 113 | |
| 114 | void gp2x_init(int bpp, int rate, int bits, int stereo, int Hz) |
| 115 | { |
| 116 | struct fb_fix_screeninfo fixed_info; |
| 117 | |
| 118 | if(!gp2x_dev[0]) gp2x_dev[0] = open("/dev/fb0", O_RDWR); |
| 119 | if(!gp2x_dev[1]) gp2x_dev[1] = open("/dev/fb1", O_RDWR); |
| 120 | if(!gp2x_dev[2]) gp2x_dev[2] = open("/dev/mem", O_RDWR); |
| 121 | //if(!gp2x_dev[3]) gp2x_dev[3] = open("/dev/dsp", O_WRONLY); |
| 122 | |
| 123 | gp2x_memregs=(unsigned short *)mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_SHARED, gp2x_dev[2], 0xc0000000); |
| 124 | |
| 125 | if(!gp2x_sound_thread) { gp2x_memregs[0x0F16>>1] = 0x830a; sleep(1); |
| 126 | gp2x_memregs[0x0F58>>1] = 0x100c; sleep(1); } |
| 127 | |
| 128 | ioctl (gp2x_dev[0], FBIOGET_FSCREENINFO, &fixed_info); |
| 129 | gp2x_screen15=gp2x_logvram15[0]=(unsigned short *)mmap(0, 320*240*2, PROT_WRITE, MAP_SHARED, gp2x_dev[0], 0); |
| 130 | gp2x_screen8=gp2x_logvram8[0]=(unsigned char *)gp2x_logvram15[0]; |
| 131 | gp2x_physvram[0]=fixed_info.smem_start; |
| 132 | |
| 133 | ioctl (gp2x_dev[1], FBIOGET_FSCREENINFO, &fixed_info); |
| 134 | gp2x_logvram15[1]=(unsigned short *)mmap(0, 320*240*2, PROT_WRITE, MAP_SHARED, gp2x_dev[1], 0); |
| 135 | gp2x_logvram8[1]=(unsigned char *)gp2x_logvram15[1]; |
| 136 | gp2x_physvram[1]=fixed_info.smem_start; |
| 137 | |
| 138 | gp2x_memregs[0x28DA>>1]=(((bpp+1)/8)<<9)|0xAB; /*8/15/16/24bpp...*/ |
| 139 | gp2x_memregs[0x290C>>1]=320*((bpp+1)/8); /*line width in bytes*/ |
| 140 | |
| 141 | ioctl(gp2x_dev[3], SNDCTL_DSP_SPEED, &rate); |
| 142 | ioctl(gp2x_dev[3], SNDCTL_DSP_SETFMT, &bits); |
| 143 | ioctl(gp2x_dev[3], SNDCTL_DSP_STEREO, &stereo); |
| 144 | |
| 145 | gp2x_sound_buffer[1]=(gp2x_sound_buffer[0]=(rate/Hz)) << (stereo + (bits==16)); |
| 146 | gp2x_sound_buffer[2]=(1000000/Hz); |
| 147 | |
| 148 | if(!gp2x_sound_thread) { gp2x_sound_thread = 1; //pthread_create( &gp2x_sound_thread, NULL, gp2x_sound_play, NULL); |
| 149 | atexit(gp2x_deinit); } |
| 150 | } |
| 151 | |
| 152 | |
| 153 | |
| 154 | /* |
| 155 | |
| 156 | EXAMPLE |
| 157 | ======= |
| 158 | |
| 159 | now supply your own function for 16 bits, stereo: |
| 160 | |
| 161 | void gp2x_sound_frame(void *blah, void *bufferg, int samples) |
| 162 | { |
| 163 | signed short *buffer=(signed short *)bufferg; |
| 164 | while(samples--) |
| 165 | { |
| 166 | *buffer++=0; //Left channel |
| 167 | *buffer++=0; //Right channel |
| 168 | } |
| 169 | } |
| 170 | |
| 171 | or 16 bits mono: |
| 172 | |
| 173 | void gp2x_sound_frame(void *blah, void *bufferg, int samples) |
| 174 | { |
| 175 | signed short *buffer=(signed short *)bufferg; |
| 176 | while(samples--) |
| 177 | { |
| 178 | *buffer++=0; //Central channel |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | now the main program... |
| 183 | |
| 184 | hicolor example: |
| 185 | |
| 186 | int main(int argc, char *argv[]) |
| 187 | { |
| 188 | //this sets video to hicolor (16 bpp) |
| 189 | //it also sets sound to 44100,16bits,stereo and syncs audio to 50 Hz (PAL timing) |
| 190 | |
| 191 | //Warning: GP2X does not support 8bit sound sampling! (at least within Linux) |
| 192 | |
| 193 | gp2x_init(16,44100,16,1,50); |
| 194 | |
| 195 | while(1) |
| 196 | { |
| 197 | unsigned long pad=gp2x_joystick_read(); |
| 198 | unsigned short color=gp2x_video_color15(255,255,255,0); |
| 199 | |
| 200 | if(pad & GP2X_L) if(pad & GP2X_R) exit(); |
| 201 | |
| 202 | if(pad & GP2X_A) color=gp2x_color15(255,255,255,0); //white |
| 203 | else color=gp2x_color15(255,0,0,0); //red |
| 204 | |
| 205 | gp2x_screen15[160+120*320]=color; //x=160, y=120 |
| 206 | gp2x_video_flip(); |
| 207 | } |
| 208 | } |
| 209 | |
| 210 | palettized example: |
| 211 | |
| 212 | int main(int argc, char *argv[]) |
| 213 | { |
| 214 | //this sets video to palette mode (8 bpp) |
| 215 | //it also sets sound to 11025,16bits,stereo and syncs audio to 60 Hz (NSTC timing) |
| 216 | |
| 217 | //Warning: GP2X does not support 8bit sound sampling! (at least within Linux) |
| 218 | |
| 219 | gp2x_init(8,11025,16,1,60); |
| 220 | |
| 221 | gp2x_video_color8(0,0,0,0); //color #0 is black for us |
| 222 | gp2x_video_color8(1,255,255,255); //color #1 is white for us |
| 223 | gp2x_video_color8(2,255,0,0); //color #2 is red for us |
| 224 | gp2x_video_setpalette(); |
| 225 | |
| 226 | while(1) |
| 227 | { |
| 228 | unsigned long pad=gp2x_joystick_read(); |
| 229 | unsigned char color; |
| 230 | |
| 231 | if(pad & GP2X_L) if(pad & GP2X_R) exit(); |
| 232 | |
| 233 | if(pad & GP2X_A) color=1; //white |
| 234 | else color=2; //red |
| 235 | |
| 236 | gp2x_screen8[160+120*320]=color; //x=160, y=120 |
| 237 | gp2x_video_flip(); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | */ |
| 242 | |