Add a little example on libvgl usage.

2 files changed, 122 insertions, 0 deletions

diff --git a/share/examples/libvgl/Makefile b/share/examples/libvgl/Makefile
new file mode 100644
index 0000000..10f7eab
--- /dev/null
+++ b/share/examples/libvgl/Makefile
@@ -0,0 +1,2 @@
+demo:	demo.c libvgl.a
+	cc -o demo demo.c -lvgl
diff --git a/share/examples/libvgl/demo.c b/share/examples/libvgl/demo.c
new file mode 100644
index 0000000..1a8e207
--- /dev/null
+++ b/share/examples/libvgl/demo.c
@@ -0,0 +1,120 @@
+/*-
+ * 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: demo.c,v 1.16 1997/08/17 20:46:55 sos Exp sos $
+ */
+
+#include <sys/types.h>
+#include <machine/console.h>
+#include "vgl.h"
+
+int
+main(int argc, char **argv)
+{
+  int x, y, xsize, ysize, i,j;
+  VGLBitmap tmp;
+
+  // set graphics mode, here 320x240 256 colors
+  // supported modes are (from <machine/console.h>):
+  // SW_VGA_CG320:	std VGA 320x200 256 colors
+  // SW_VGA_MODEX:	Modex VGA 320x240 256 colors
+  // SW_VGA_VG640:	std VGA 640x480 16 colors
+  VGLInit(SW_VGA_MODEX);
+
+  // initialize mouse and show pointer
+  VGLMouseInit(VGL_MOUSESHOW);
+
+  // VGLDisplay is a ptr to a struct Bitmap defined and initialized by 
+  // libvgl. The Bitmap points directly to screen memory etc.
+  xsize=VGLDisplay->Xsize;
+  ysize=VGLDisplay->Ysize;
+
+  // alloc a new bitmap (there should be a function for this)
+  tmp.Type = MEMBUF; tmp.Bitmap = (char*)malloc(256*256);
+  tmp.Xsize = 256; tmp.Ysize = 256;
+
+  // fill the screen with colored lines
+  for (y=0; y<ysize; y++) 
+    VGLLine(VGLDisplay, 0, y, xsize-1, y, y/2 % 256);
+
+  // draw some lines and circles just to show off
+  VGLLine(VGLDisplay, 0, 0, xsize-1, ysize-1, 63);
+  VGLLine(VGLDisplay, 0, ysize-1, xsize-1, 0, 63);
+  VGLLine(VGLDisplay, 0, 0, 0, ysize-1, 63);
+  VGLLine(VGLDisplay, xsize-1, 0, xsize-1, ysize-1, 63);
+  VGLEllipse(VGLDisplay, 256, 0, 256, 256, 63);
+  VGLEllipse(VGLDisplay, 0, 256, 256, 256, 0);
+
+  // some text is also usefull
+  VGLBitmapString(VGLDisplay, 100,100,
+    "This is text", 63, 0, 0, VGL_DIR_RIGHT);
+  sleep(2);
+  VGLBitmapString(VGLDisplay, 100,100,
+    "This is text", 63, 0, 0, VGL_DIR_UP);
+  sleep(2);
+  VGLBitmapString(VGLDisplay, 100,100,
+    "This is text", 63, 0, 0, VGL_DIR_LEFT);
+  sleep(2);
+  VGLBitmapString(VGLDisplay, 100,100,
+    "This is text", 63, 0, 0, VGL_DIR_DOWN);
+  sleep(2);
+
+  // now show some simple bitblit 
+  for (i=0; i<256; i++)
+    for (j=0; j<256; j++)
+      tmp.Bitmap[i+256*j] = i%16;
+  VGLBitmapCopy(&tmp, 0, 0, VGLDisplay, 0, 0, 128, 128);
+  for (i=0; i<256; i++)
+    for (j=0; j<256; j++)
+      tmp.Bitmap[i+256*j] = j%16;
+  VGLBitmapCopy(&tmp, 0, 0, VGLDisplay, 3, 128, 128, 128);
+  sleep(2);
+  VGLBitmapCopy(VGLDisplay, 237, 311, &tmp, 64, 64, 128, 128);
+  VGLBitmapCopy(&tmp, 32, 32, VGLDisplay, 400, 128, 128, 128);
+  sleep(2);
+  VGLBitmapCopy(VGLDisplay, 300, 300, VGLDisplay, 500, 128, 128, 128);
+  sleep(5);
+  i=0;
+
+  // loop around drawing and copying
+  while (++i) {
+    VGLBitmapCopy(VGLDisplay, rand()%xsize, rand()%ysize,
+  		  VGLDisplay, rand()%xsize, rand()%ysize,
+  		  rand()%xsize, rand()%ysize);
+    VGLLine(VGLDisplay,  rand()%xsize, rand()%ysize, 
+            rand()%xsize, rand()%ysize, rand()%256);
+    VGLEllipse(VGLDisplay, rand()%xsize, rand()%ysize,
+   	       rand()%xsize/2, rand()%ysize/2, rand()%256);
+    rand();
+    if (i > 1000) break;
+  }
+
+  // restore screen to its original mode
+  VGLEnd();
+  return 0;
+}
+