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Diffstat (limited to 'demos/natives/x11/xfont.c')
| -rw-r--r-- | demos/natives/x11/xfont.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/demos/natives/x11/xfont.c b/demos/natives/x11/xfont.c new file mode 100644 index 0000000..a63257c --- /dev/null +++ b/demos/natives/x11/xfont.c @@ -0,0 +1,195 @@ +/* $Id$ */ + +/* + * 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 glXUseXFont(). + * 5 November 1999 + * Brian Paul + */ + + +#include <GL/gl.h> +#include <GL/glx.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + + +static const char *ProgramName = "xfont"; + +static const char *FontName = "fixed"; + +static GLuint FontBase = 0; + + GLXContext ctx; + Window win; + + +static void redraw(Display *dpy ) +{ + static const char *text = "This is glXUseXFont()"; + + glXMakeCurrent( dpy, win, ctx ); + glClear( GL_COLOR_BUFFER_BIT ); + + /* triangle */ + glColor3f( 0.2, 0.2, 1.0 ); + glBegin(GL_TRIANGLES); + glVertex2f( 0, 0.8 ); + glVertex2f( -0.8, -0.7 ); + glVertex2f( 0.8, -0.7 ); + glEnd(); + + /* text */ + glColor3f( 1, 1, 1 ); + glRasterPos2f(-0.8, 0); + glListBase(FontBase); + glCallLists(strlen(text), GL_UNSIGNED_BYTE, (GLubyte *) text); + + glXSwapBuffers( dpy, win ); + + /** + * NOTE: + * this is the "bad" call, + * which produces so many "(II) [GLX]:" messages in .X.err + * by the NVidia 0.96 linux driver ! + * + * but it is a MUST, if we assume, + * that this ctx should be called many threads + * -> only one thread can hold the ctx at a time ! + */ + glXMakeCurrent( dpy, None, NULL); +} + + + +static void setup_font( Display *dpy ) +{ + XFontStruct *fontInfo; + Font id; + unsigned int first, last; + + 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; + + FontBase = glGenLists((GLuint) last + 1); + if (!FontBase) { + printf("Error: unable to allocate display lists\n"); + exit(0); + } + glXUseXFont(id, first, last - first + 1, FontBase + first); +} + +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; + 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 ) +{ + while (1) { + redraw(dpy ); + } +} + + + +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; +} |