lib/gdi/fb.cpp

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <fcntl.h>
   4 #include <sys/ioctl.h>
   5 #include <unistd.h>
   6 #include <sys/mman.h>
   7 #include <memory.h>
   8 #include <linux/kd.h>
   9
  10 #include <lib/gdi/fb.h>
  11
  12 #ifndef FBIO_WAITFORVSYNC
  13 #define FBIO_WAITFORVSYNC _IOW('F', 0x20, __u32)
  14 #endif
  15
  16 #ifndef FBIO_BLIT
  17 #define FBIO_SET_MANUAL_BLIT _IOW('F', 0x21, __u8)
  18 #define FBIO_BLIT 0x22
  19 #endif
  20
  21 fbClass *fbClass::instance;
  22
  23 fbClass *fbClass::getInstance()
  24 {
  25         return instance;
  26 }
  27
  28 fbClass::fbClass(const char *fb)
  29 {
  30         m_manual_blit=-1;
  31         instance=this;
  32         locked=0;
  33         available=0;
  34         cmap.start=0;
  35         cmap.len=256;
  36         cmap.red=red;
  37         cmap.green=green;
  38         cmap.blue=blue;
  39         cmap.transp=trans;
  40
  41         fd=open(fb, O_RDWR);
  42         if (fd<0)
  43         {
  44                 perror(fb);
  45                 goto nolfb;
  46         }
  47
  48
  49         if (ioctl(fd, FBIOGET_VSCREENINFO, &screeninfo)<0)
  50         {
  51                 perror("FBIOGET_VSCREENINFO");
  52                 goto nolfb;
  53         }
  54
  55         memcpy(&oldscreen, &screeninfo, sizeof(screeninfo));
  56
  57         fb_fix_screeninfo fix;
  58         if (ioctl(fd, FBIOGET_FSCREENINFO, &fix)<0)
  59         {
  60                 perror("FBIOGET_FSCREENINFO");
  61                 goto nolfb;
  62         }
  63
  64         available=fix.smem_len;
  65         eDebug("%dk video mem", available/1024);
  66         lfb=(unsigned char*)mmap(0, available, PROT_WRITE|PROT_READ, MAP_SHARED, fd, 0);
  67         if (!lfb)
  68         {
  69                 perror("mmap");
  70                 goto nolfb;
  71         }
  72
  73         showConsole(0);
  74
  75         enableManualBlit();
  76         return;
  77 nolfb:
  78         lfb=0;
  79         printf("framebuffer not available.\n");
  80         return;
  81 }
  82
  83 int fbClass::showConsole(int state)
  84 {
  85         int fd=open("/dev/vc/0", O_RDWR);
  86         if(fd>=0)
  87         {
  88                 if(ioctl(fd, KDSETMODE, state?KD_TEXT:KD_GRAPHICS)<0)
  89                 {
  90                         eDebug("setting /dev/vc/0 status failed.");
  91                 }
  92                 close(fd);
  93         }
  94         return 0;
  95 }
  96
  97 int fbClass::SetMode(unsigned int nxRes, unsigned int nyRes, unsigned int nbpp)
  98 {
  99         screeninfo.xres_virtual=screeninfo.xres=nxRes;
 100         screeninfo.yres_virtual=(screeninfo.yres=nyRes)*2;
 101         screeninfo.height=0;
 102         screeninfo.width=0;
 103         screeninfo.xoffset=screeninfo.yoffset=0;
 104         screeninfo.bits_per_pixel=nbpp;
 105
 106         switch (nbpp) {
 107         case 16:
 108                 // ARGB 1555
 109                 screeninfo.transp.offset = 15;
 110                 screeninfo.transp.length = 1;
 111                 screeninfo.red.offset = 10;
 112                 screeninfo.red.length = 5;
 113                 screeninfo.green.offset = 5;
 114                 screeninfo.green.length = 5;
 115                 screeninfo.blue.offset = 0;
 116                 screeninfo.blue.length = 5;
 117                 break;
 118         case 32:
 119                 // ARGB 8888
 120                 screeninfo.transp.offset = 24;
 121                 screeninfo.transp.length = 8;
 122                 screeninfo.red.offset = 16;
 123                 screeninfo.red.length = 8;
 124                 screeninfo.green.offset = 8;
 125                 screeninfo.green.length = 8;
 126                 screeninfo.blue.offset = 0;
 127                 screeninfo.blue.length = 8;
 128                 break;
 129         }
 130
 131         if (ioctl(fd, FBIOPUT_VSCREENINFO, &screeninfo)<0)
 132         {
 133                 // try single buffering
 134                 screeninfo.yres_virtual=screeninfo.yres=nyRes;
 135
 136                 if (ioctl(fd, FBIOPUT_VSCREENINFO, &screeninfo)<0)
 137                 {
 138                         perror("FBIOPUT_VSCREENINFO");
 139                         printf("fb failed\n");
 140                         return -1;
 141                 }
 142                 eDebug(" - double buffering not available.");
 143         } else
 144                 eDebug(" - double buffering available!");
 145
 146         m_number_of_pages = screeninfo.yres_virtual / nyRes;
 147
 148         ioctl(fd, FBIOGET_VSCREENINFO, &screeninfo);
 149
 150         if ((screeninfo.xres!=nxRes) && (screeninfo.yres!=nyRes) && (screeninfo.bits_per_pixel!=nbpp))
 151         {
 152                 eDebug("SetMode failed: wanted: %dx%dx%d, got %dx%dx%d",
 153                         nxRes, nyRes, nbpp,
 154                         screeninfo.xres, screeninfo.yres, screeninfo.bits_per_pixel);
 155         }
 156         xRes=screeninfo.xres;
 157         yRes=screeninfo.yres;
 158         bpp=screeninfo.bits_per_pixel;
 159         fb_fix_screeninfo fix;
 160         if (ioctl(fd, FBIOGET_FSCREENINFO, &fix)<0)
 161         {
 162                 perror("FBIOGET_FSCREENINFO");
 163                 printf("fb failed\n");
 164         }
 165         stride=fix.line_length;
 166         memset(lfb, 0, stride*yRes);
 167         return 0;
 168 }
 169
 170 int fbClass::setOffset(int off)
 171 {
 172         screeninfo.xoffset = 0;
 173         screeninfo.yoffset = off;
 174         return ioctl(fd, FBIOPAN_DISPLAY, &screeninfo);
 175 }
 176
 177 int fbClass::waitVSync()
 178 {
 179         int c = 0;
 180         return ioctl(fd, FBIO_WAITFORVSYNC, &c);
 181 }
 182
 183 void fbClass::blit()
 184 {
 185         if (m_manual_blit == 1) {
 186                 if (ioctl(fd, FBIO_BLIT) < 0)
 187                         perror("FBIO_BLIT");
 188         }
 189 }
 190
 191 fbClass::~fbClass()
 192 {
 193         if (available)
 194                 ioctl(fd, FBIOPUT_VSCREENINFO, &oldscreen);
 195         if (lfb)
 196                 munmap(lfb, available);
 197         showConsole(1);
 198         disableManualBlit();
 199 }
 200
 201 int fbClass::PutCMAP()
 202 {
 203         return ioctl(fd, FBIOPUTCMAP, &cmap);
 204 }
 205
 206 int fbClass::lock()
 207 {
 208         if (locked)
 209                 return -1;
 210         if (m_manual_blit == 1)
 211         {
 212                 locked = 2;
 213                 disableManualBlit();
 214         }
 215         else
 216                 locked = 1;
 217         return fd;
 218 }
 219
 220 void fbClass::unlock()
 221 {
 222         if (!locked)
 223                 return;
 224         if (locked == 2)  // re-enable manualBlit
 225                 enableManualBlit();
 226         locked=0;
 227         SetMode(xRes, yRes, bpp);
 228         PutCMAP();
 229 }
 230
 231 void fbClass::enableManualBlit()
 232 {
 233         unsigned char tmp = 1;
 234         if (ioctl(fd,FBIO_SET_MANUAL_BLIT, &tmp)<0)
 235                 perror("FBIO_SET_MANUAL_BLIT");
 236         else
 237                 m_manual_blit = 1;
 238 }
 239
 240 void fbClass::disableManualBlit()
 241 {
 242         unsigned char tmp = 0;
 243         if (ioctl(fd,FBIO_SET_MANUAL_BLIT, &tmp)<0)
 244                 perror("FBIO_SET_MANUAL_BLIT");
 245         else
 246                 m_manual_blit = 0;
 247 }
 248