First import of my little "video graphic library".

See the manpage vgl.3 for more info.

A little example will follow shortly.

1 files changed, 226 insertions, 0 deletions

diff --git a/lib/libvgl/main.c b/lib/libvgl/main.c
new file mode 100644
index 0000000..4334f4e
--- /dev/null
+++ b/lib/libvgl/main.c
@@ -0,0 +1,226 @@
+/*-
+ * Copyright (c) 1991-1997 Søren Schmidt
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  $Id: main.c,v 1.14 1997/08/15 12:32:59 sos Exp $
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/signal.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <machine/console.h>
+#include "vgl.h"
+
+VGLBitmap *VGLDisplay;
+
+static int VGLMode;
+static int VGLOldMode;
+static byte *VGLBuf;
+static byte *VGLMem;
+static int VGLSwitchPending;
+static int VGLOnDisplay;
+
+void
+VGLEnd()
+{
+struct vt_mode smode;
+
+/*
+  while (!VGLOnDisplay) pause(); 
+  VGLCheckSwitch();;
+*/
+  outb(0x3c4, 0x02);
+  outb(0x3c5, 0x0f);
+  bzero(VGLMem, 64*1024);
+  ioctl(0, _IO('S', VGLOldMode), 0);
+  ioctl(0, KDDISABIO, 0);
+  ioctl(0, KDSETMODE, KD_TEXT);
+  smode.mode = VT_AUTO;
+  ioctl(0, VT_SETMODE, &smode);
+  free(VGLBuf);
+  free(VGLDisplay);
+}
+
+static void 
+VGLAbort()
+{
+  VGLEnd();
+  exit(0);
+}
+
+static void
+VGLSwitch()
+{
+  if (!VGLOnDisplay)
+    VGLOnDisplay = 1;
+  else
+    VGLOnDisplay = 0;
+  VGLSwitchPending = 1;
+  signal(SIGUSR1, VGLSwitch);
+}
+
+int
+VGLInit(int mode)
+{
+  struct vt_mode smode;
+  struct winsize winsz;
+  int error;
+
+  signal(SIGUSR1, VGLSwitch);
+  signal(SIGINT, VGLAbort);
+  signal(SIGSEGV, VGLAbort);
+  signal(SIGBUS, VGLAbort);
+
+  VGLOnDisplay = 1;
+  VGLSwitchPending = 0;
+
+  ioctl(0, CONS_GET, &VGLOldMode);
+
+  VGLMem = (byte*)mmap(0, 0x10000, PROT_READ|PROT_WRITE, MAP_FILE,
+                          open("/dev/mem", O_RDWR), 0xA0000);
+  if (VGLMem <= (byte*)0)
+    return 1;
+
+  VGLBuf = (byte*)malloc(256*1024);
+  if (VGLBuf == NULL)
+    return 1;
+
+  VGLDisplay = (VGLBitmap*) malloc(sizeof(VGLBitmap));
+  if (VGLDisplay == NULL) {
+    free(VGLBuf);
+    return 1;
+  }
+
+  switch (mode) {
+  case SW_BG640x480: case SW_CG640x480:
+    VGLDisplay->Type = VIDBUF4;
+    break;
+  case SW_VGA_CG320:
+    VGLDisplay->Type = VIDBUF8;
+    break;
+  case SW_VGA_MODEX:
+    VGLDisplay->Type = VIDBUF8X;
+    break;
+  default:
+    VGLEnd();
+    return 1;
+  }
+
+  if ((error = ioctl(0, KDENABIO, 0)))
+    return error;
+
+  ioctl(0, VT_WAITACTIVE, 0);
+  ioctl(0, KDSETMODE, KD_GRAPHICS);
+  if ((error = ioctl(0, mode, 0))) {
+    ioctl(0, KDSETMODE, KD_TEXT);
+    ioctl(0, KDDISABIO, 0);
+    return error;
+  }
+
+  VGLMode = mode;
+
+  outb(0x3c4, 0x02);
+  outb(0x3c5, 0x0f);
+  bzero(VGLMem, 64*1024);
+
+  if (ioctl(0, TIOCGWINSZ, &winsz)) {
+    VGLEnd();
+    return 1;
+  }
+
+  VGLDisplay->Bitmap = VGLMem;
+  VGLDisplay->Xsize = winsz.ws_xpixel;
+  VGLDisplay->Ysize = winsz.ws_ypixel;
+  VGLSavePalette();
+
+  smode.mode = VT_PROCESS;
+  smode.waitv = 0;
+  smode.relsig = SIGUSR1;
+  smode.acqsig = SIGUSR1;
+  smode.frsig  = SIGINT;	
+  if (ioctl(0, VT_SETMODE, &smode) == -1) {
+    VGLEnd();
+    return 1;
+  }
+  VGLTextSetFontFile((byte*)0);
+  return 0;
+}
+
+void
+VGLCheckSwitch()
+{
+  if (VGLSwitchPending) {
+    int i;
+
+    VGLSwitchPending = 0;
+    if (VGLOnDisplay) {
+      ioctl(0, KDENABIO, 0);
+      ioctl(0, KDSETMODE, KD_GRAPHICS);
+      ioctl(0, VGLMode, 0);
+      outb(0x3c6, 0xff);
+      for (i=0; i<4; i++) {
+        outb(0x3c4, 0x02);
+        outb(0x3c5, 0x01<<i);
+        bcopy(&VGLBuf[i*64*1024], VGLMem, 64*1024);
+      }
+      VGLRestorePalette();
+      ioctl(0, VT_RELDISP, VT_ACKACQ);
+      VGLDisplay->Bitmap = VGLMem;
+      switch (VGLMode) {
+      case SW_BG640x480: case SW_CG640x480:
+        VGLDisplay->Type = VIDBUF4;
+        break;
+      case SW_VGA_CG320:
+        VGLDisplay->Type = VIDBUF8;
+        break;
+      case SW_VGA_MODEX:
+        VGLDisplay->Type = VIDBUF8X;
+        break;
+      default:
+        VGLDisplay->Type = VIDBUF8;			/* XXX */
+        break;
+      }
+    }
+    else {
+      for (i=0; i<4; i++) {
+        outb(0x3ce, 0x04);
+        outb(0x3cf, i);
+        bcopy(VGLMem, &VGLBuf[i*64*1024], 64*1024);
+      }
+      ioctl(0, VGLOldMode, 0);
+      ioctl(0, KDSETMODE, KD_TEXT);
+      ioctl(0, KDDISABIO, 0);
+      ioctl(0, VT_RELDISP, VT_TRUE);
+      VGLDisplay->Bitmap = VGLBuf;
+      VGLDisplay->Type = MEMBUF;
+    }
+  }
+  while (!VGLOnDisplay) pause();
+}
+