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=0;
  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         if (ioctl(fd, FBIOPUT_VSCREENINFO, &screeninfo)<0)
 107         {
 108                 // try single buffering
 109                 screeninfo.yres_virtual=screeninfo.yres=nyRes;
 110
 111                 if (ioctl(fd, FBIOPUT_VSCREENINFO, &screeninfo)<0)
 112                 {
 113                         perror("FBIOPUT_VSCREENINFO");
 114                         printf("fb failed\n");
 115                         return -1;
 116                 }
 117                 eDebug(" - double buffering not available.");
 118         } else
 119                 eDebug(" - double buffering available!");
 120
 121         m_number_of_pages = screeninfo.yres_virtual / nyRes;
 122
 123         ioctl(fd, FBIOGET_VSCREENINFO, &screeninfo);
 124
 125         if ((screeninfo.xres!=nxRes) && (screeninfo.yres!=nyRes) && (screeninfo.bits_per_pixel!=nbpp))
 126         {
 127                 eDebug("SetMode failed: wanted: %dx%dx%d, got %dx%dx%d",
 128                         nxRes, nyRes, nbpp,
 129                         screeninfo.xres, screeninfo.yres, screeninfo.bits_per_pixel);
 130         }
 131         xRes=screeninfo.xres;
 132         yRes=screeninfo.yres;
 133         bpp=screeninfo.bits_per_pixel;
 134         fb_fix_screeninfo fix;
 135         if (ioctl(fd, FBIOGET_FSCREENINFO, &fix)<0)
 136         {
 137                 perror("FBIOGET_FSCREENINFO");
 138                 printf("fb failed\n");
 139         }
 140         stride=fix.line_length;
 141         memset(lfb, 0, stride*yRes);
 142         return 0;
 143 }
 144
 145 int fbClass::setOffset(int off)
 146 {
 147         screeninfo.xoffset = 0;
 148         screeninfo.yoffset = off;
 149         return ioctl(fd, FBIOPAN_DISPLAY, &screeninfo);
 150 }
 151
 152 int fbClass::waitVSync()
 153 {
 154         int c = 0;
 155         return ioctl(fd, FBIO_WAITFORVSYNC, &c);
 156 }
 157
 158 void fbClass::blit()
 159 {
 160         if (m_manual_blit) {
 161                 if (ioctl(fd, FBIO_BLIT) < 0)
 162                         perror("FBIO_BLIT");
 163         }
 164 }
 165
 166 fbClass::~fbClass()
 167 {
 168         if (available)
 169                 ioctl(fd, FBIOPUT_VSCREENINFO, &oldscreen);
 170         if (lfb)
 171                 munmap(lfb, available);
 172         showConsole(1);
 173         disableManualBlit();
 174 }
 175
 176 int fbClass::PutCMAP()
 177 {
 178         return ioctl(fd, FBIOPUTCMAP, &cmap);
 179 }
 180
 181 int fbClass::lock()
 182 {
 183         if (locked)
 184                 return -1;
 185         locked=1;
 186         return fd;
 187 }
 188
 189 void fbClass::unlock()
 190 {
 191         if (!locked)
 192                 return;
 193         locked=0;
 194         SetMode(xRes, yRes, bpp);
 195         PutCMAP();
 196 }
 197
 198 void fbClass::enableManualBlit()
 199 {
 200         unsigned char tmp = 1;
 201         if (ioctl(fd,FBIO_SET_MANUAL_BLIT, &tmp)<0)
 202                 perror("FBIO_SET_MANUAL_BLIT");
 203         else
 204                 m_manual_blit = 1;
 205 }
 206
 207 void fbClass::disableManualBlit()
 208 {
 209         unsigned char tmp = 0;
 210         if (ioctl(fd,FBIO_SET_MANUAL_BLIT, &tmp)<0)
 211                 perror("FBIO_SET_MANUAL_BLIT");
 212         else
 213                 m_manual_blit = 0;
 214 }
 215