New glXUseRotatedXFontMESA() function. Like glXUseXFont(), but takes

a rotation parameter (either 0, 90, 180 or 270 degrees).
Also, a demo program.

1 files changed, 220 insertions, 0 deletions

diff --git a/progs/xdemos/xrotfontdemo.c b/progs/xdemos/xrotfontdemo.c
new file mode 100644
index 00000000000..58cd0286cc6
--- /dev/null
+++ b/progs/xdemos/xrotfontdemo.c
@@ -0,0 +1,220 @@
+/*
+ * Mesa 3-D graphics library
+ * 
+ * Copyright (C) 1999  Brian Paul   All Rights Reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*
+ * Example of using glXUseRotatedXFontMESA().
+ * 24 Jan 2004
+ * Brian Paul
+ */
+
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "xuserotfont.h"
+
+
+static const char *ProgramName = "xfont";
+
+static const char *FontName = "fixed";
+
+static GLuint FontBase[4];
+
+
+static void redraw( Display *dpy, Window w )
+{
+   static const char *text = "  Rotated bitmap text";
+   int i;
+
+   glClear( GL_COLOR_BUFFER_BIT );
+
+   /* triangle */
+   glColor3f( 0.2, 0.2, 1.0 );
+   glBegin(GL_TRIANGLES);
+   glVertex2f( -0.8,  0.7 );
+   glVertex2f( -0.8, -0.7 );
+   glVertex2f(  0.8,  0.0 );
+   glEnd();
+
+   /* marker */
+   glColor3f( 0, 1, 0 );
+   glBegin(GL_POINTS);
+   glVertex2f(0, 0);
+   glEnd();
+
+   /* text */
+   glColor3f( 1, 1, 1 );
+
+   for (i = 0; i < 4; i++) {
+      glRasterPos2f(0, 0); 
+      glListBase(FontBase[i]);
+      glCallLists(strlen(text), GL_UNSIGNED_BYTE, (GLubyte *) text);
+   }
+
+   glXSwapBuffers( dpy, w );
+}
+
+
+
+static void resize( unsigned int width, unsigned int height )
+{
+   glViewport( 0, 0, width, height );
+   glMatrixMode( GL_PROJECTION );
+   glLoadIdentity();
+   glOrtho( -1.0, 1.0, -1.0, 1.0, -1.0, 1.0 );
+}
+
+
+
+static void setup_font( Display *dpy )
+{
+    XFontStruct *fontInfo;
+    Font id;
+    unsigned int first, last;
+    int i;
+
+    fontInfo = XLoadQueryFont(dpy, FontName);
+    if (!fontInfo) {
+        printf("Error: font %s not found\n", FontName);
+	exit(0);
+    }
+
+    id = fontInfo->fid;
+    first = fontInfo->min_char_or_byte2;
+    last = fontInfo->max_char_or_byte2;
+
+    for (i = 0; i < 4; i++) {
+       FontBase[i] = glGenLists((GLuint) last + 1);
+       if (!FontBase[i]) {
+          printf("Error: unable to allocate display lists\n");
+          exit(0);
+       }
+       glXUseRotatedXFontMESA(id, first, last - first + 1, FontBase[i] + first,
+                              i * 90);
+    }
+}
+
+
+static Window make_rgb_db_window( Display *dpy, int xpos, int ypos,
+				  unsigned int width, unsigned int height )
+{
+   int attrib[] = { GLX_RGBA,
+		    GLX_RED_SIZE, 1,
+		    GLX_GREEN_SIZE, 1,
+		    GLX_BLUE_SIZE, 1,
+		    GLX_DOUBLEBUFFER,
+		    None };
+   int scrnum;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+   Window win;
+   GLXContext ctx;
+   XVisualInfo *visinfo;
+
+   scrnum = DefaultScreen( dpy );
+   root = RootWindow( dpy, scrnum );
+
+   visinfo = glXChooseVisual( dpy, scrnum, attrib );
+   if (!visinfo) {
+      printf("Error: couldn't get an RGB, Double-buffered visual\n");
+      exit(1);
+   }
+
+   /* window attributes */
+   attr.background_pixel = 0;
+   attr.border_pixel = 0;
+   attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
+   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+   win = XCreateWindow( dpy, root, 0, 0, width, height,
+		        0, visinfo->depth, InputOutput,
+		        visinfo->visual, mask, &attr );
+
+   {
+      XSizeHints sizehints;
+      sizehints.x = xpos;
+      sizehints.y = ypos;
+      sizehints.width  = width;
+      sizehints.height = height;
+      sizehints.flags = USSize | USPosition;
+      XSetNormalHints(dpy, win, &sizehints);
+      XSetStandardProperties(dpy, win, ProgramName, ProgramName,
+                              None, (char **)NULL, 0, &sizehints);
+   }
+
+
+   ctx = glXCreateContext( dpy, visinfo, NULL, True );
+
+   glXMakeCurrent( dpy, win, ctx );
+
+   return win;
+}
+
+
+static void event_loop( Display *dpy )
+{
+   XEvent event;
+
+   while (1) {
+      XNextEvent( dpy, &event );
+
+      switch (event.type) {
+	 case Expose:
+	    redraw( dpy, event.xany.window );
+	    break;
+	 case ConfigureNotify:
+	    resize( event.xconfigure.width, event.xconfigure.height );
+	    break;
+         case KeyPress:
+            exit(0);
+         default:
+            ;  /* no-op */
+      }
+   }
+}
+
+
+
+int main( int argc, char *argv[] )
+{
+   Display *dpy;
+   Window win;
+
+   dpy = XOpenDisplay(NULL);
+
+   win = make_rgb_db_window( dpy, 0, 0, 300, 300 );
+   setup_font( dpy );
+
+   glShadeModel( GL_FLAT );
+   glClearColor( 0.5, 0.5, 1.0, 1.0 );
+
+   XMapWindow( dpy, win );
+
+   event_loop( dpy );
+   return 0;
+}