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Brian Paul
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/* $Id: wincopy.c,v 1.1 1999/11/25 17:41:51 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 3.3
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*
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* Copyright (C) 1999 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* This program opens two GLX windows, renders into one and uses
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* glCopyPixels to copy the image from the first window into the
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* second by means of the GLX 1.3 function glxMakeContextCurrent().
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* This function works just like the glXMakeCurrentReadSGI() function
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* in the GLX_SGI_make_current_read extension.
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*/
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef GLX_VERSION_1_3
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static Display *Dpy;
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static int ScrNum;
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static GLXContext Context;
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static Window Win[2]; /* Win[0] = source, Win[1] = dest */
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static GLint Width[2], Height[2];
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static GLfloat Angle = 0.0;
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static Window
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CreateWindow(Display *dpy, int scrnum, XVisualInfo *visinfo,
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int xpos, int ypos, int width, int height,
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const char *name)
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{
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Window win;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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root = RootWindow(dpy, scrnum);
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/* window attributes */
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attr.background_pixel = 0;
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attr.border_pixel = 0;
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attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
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attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
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mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
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win = XCreateWindow(dpy, root, xpos, ypos, width, height,
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0, visinfo->depth, InputOutput,
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visinfo->visual, mask, &attr);
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if (win) {
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XSizeHints sizehints;
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sizehints.x = xpos;
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sizehints.y = ypos;
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sizehints.width = width;
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sizehints.height = height;
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sizehints.flags = USSize | USPosition;
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XSetNormalHints(dpy, win, &sizehints);
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XSetStandardProperties(dpy, win, name, name,
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None, (char **)NULL, 0, &sizehints);
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XMapWindow(dpy, win);
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}
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return win;
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}
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static void
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Redraw(void)
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{
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/* make the first window the current one */
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if (!glXMakeContextCurrent(Dpy, Win[0], Win[0], Context)) {
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printf("glXMakeContextCurrent failed in Redraw()\n");
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return;
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}
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Angle += 1.0;
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glViewport(0, 0, Width[0], Height[0]);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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glShadeModel(GL_FLAT);
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glClearColor(0.5, 0.5, 0.5, 1.0);
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glClear(GL_COLOR_BUFFER_BIT);
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/* draw blue quad */
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glColor3f(0.3, 0.3, 1.0);
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glPushMatrix();
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glRotatef(Angle, 0, 0, 1);
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glBegin(GL_POLYGON);
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glVertex2f(-0.5, -0.25);
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glVertex2f( 0.5, -0.25);
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glVertex2f( 0.5, 0.25);
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glVertex2f(-0.5, 0.25);
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glEnd();
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glPopMatrix();
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glXSwapBuffers(Dpy, Win[0]);
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/* copy image from window 0 to window 1 */
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if (!glXMakeContextCurrent(Dpy, Win[1], Win[0], Context)) {
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printf("glXMakeContextCurrent failed in Redraw()\n");
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return;
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}
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/* raster pos setup */
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glViewport(0, 0, Width[1], Height[1]);
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glPushMatrix();
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glLoadIdentity();
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glMatrixMode(GL_PROJECTION);
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glPushMatrix();
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glLoadIdentity();
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glOrtho(-1, 1, -1, 1, -1, 1);
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glRasterPos2f(-1, -1);
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/* copy the image between windows */
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glDrawBuffer(GL_FRONT);
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glCopyPixels(0, 0, Width[0], Height[0], GL_COLOR);
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glDrawBuffer(GL_BACK);
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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glPopMatrix();
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}
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static void
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Resize(Window win, unsigned int width, unsigned int height)
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{
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int i;
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if (win == Win[0]) {
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i = 0;
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}
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else {
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i = 1;
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}
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Width[i] = width;
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Height[i] = height;
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if (!glXMakeCurrent(Dpy, Win[i], Context)) {
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printf("glXMakeCurrent failed in Resize()\n");
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return;
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}
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}
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static void
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EventLoop(void)
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{
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XEvent event;
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while (1) {
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if (XPending(Dpy) > 0) {
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XNextEvent( Dpy, &event );
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switch (event.type) {
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case Expose:
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Redraw();
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break;
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case ConfigureNotify:
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Resize(event.xany.window, event.xconfigure.width, event.xconfigure.height);
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break;
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case KeyPress:
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return;
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default:
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/*no-op*/ ;
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}
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}
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else {
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/* animate */
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Redraw();
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}
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}
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}
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static void
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Init(void)
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{
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XVisualInfo *visinfo;
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int attrib[] = { GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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GLX_DOUBLEBUFFER,
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None };
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Dpy = XOpenDisplay(NULL);
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if (!Dpy) {
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printf("Couldn't open default display!\n");
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exit(1);
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}
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ScrNum = DefaultScreen(Dpy);
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visinfo = glXChooseVisual(Dpy, ScrNum, attrib);
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if (!visinfo) {
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printf("Unable to find RGB, double-buffered visual\n");
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exit(1);
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}
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Context = glXCreateContext(Dpy, visinfo, NULL, True);
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if (!Context) {
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printf("Couldn't create GLX context\n");
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exit(1);
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}
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Win[0] = CreateWindow(Dpy, ScrNum, visinfo,
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0, 0, 300, 300, "source window");
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Win[1] = CreateWindow(Dpy, ScrNum, visinfo,
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350, 0, 300, 300, "dest window");
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}
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int
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main(int argc, char *argv[])
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{
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Init();
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EventLoop();
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return 0;
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}
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#else
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int
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main(int argc, char *argv[])
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{
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printf("This program requires GLX 1.3!\n");
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return 0;
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}
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#endif /* GLX_VERSION_1_3 */
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