initial rev

progs/xdemos/wincopy.c

@@ -0,0 +1,270 @@
+/* $Id: wincopy.c,v 1.1 1999/11/25 17:41:51 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.3
+ * 
+ * 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.
+ */
+
+
+/*
+ * This program opens two GLX windows, renders into one and uses
+ * glCopyPixels to copy the image from the first window into the
+ * second by means of the GLX 1.3 function glxMakeContextCurrent().
+ * This function works just like the glXMakeCurrentReadSGI() function
+ * in the GLX_SGI_make_current_read extension.
+ */
+
+
+
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+#ifdef GLX_VERSION_1_3
+
+
+static Display *Dpy;
+static int ScrNum;
+static GLXContext Context;
+static Window Win[2];  /* Win[0] = source,  Win[1] = dest */
+static GLint Width[2], Height[2];
+
+static GLfloat Angle = 0.0;
+
+
+
+static Window
+CreateWindow(Display *dpy, int scrnum, XVisualInfo *visinfo,
+             int xpos, int ypos, int width, int height,
+             const char *name)
+{
+   Window win;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+
+   root = RootWindow(dpy, scrnum);
+
+   /* 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, xpos, ypos, width, height,
+		        0, visinfo->depth, InputOutput,
+		        visinfo->visual, mask, &attr);
+   if (win) {
+      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, name, name,
+                              None, (char **)NULL, 0, &sizehints);
+
+      XMapWindow(dpy, win);
+   }
+   return win;
+}
+
+
+static void
+Redraw(void)
+{
+   /* make the first window the current one */
+   if (!glXMakeContextCurrent(Dpy, Win[0], Win[0], Context)) {
+      printf("glXMakeContextCurrent failed in Redraw()\n");
+      return;
+   }
+
+   Angle += 1.0;
+
+   glViewport(0, 0, Width[0], Height[0]);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
+
+   glShadeModel(GL_FLAT);
+   glClearColor(0.5, 0.5, 0.5, 1.0);
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   /* draw blue quad */
+   glColor3f(0.3, 0.3, 1.0);
+   glPushMatrix();
+   glRotatef(Angle, 0, 0, 1);
+   glBegin(GL_POLYGON);
+   glVertex2f(-0.5, -0.25);
+   glVertex2f( 0.5, -0.25);
+   glVertex2f( 0.5, 0.25);
+   glVertex2f(-0.5, 0.25);
+   glEnd();
+   glPopMatrix();
+
+   glXSwapBuffers(Dpy, Win[0]);
+
+
+   /* copy image from window 0 to window 1 */
+   if (!glXMakeContextCurrent(Dpy, Win[1], Win[0], Context)) {
+      printf("glXMakeContextCurrent failed in Redraw()\n");
+      return;
+   }
+
+   /* raster pos setup */
+   glViewport(0, 0, Width[1], Height[1]);
+   glPushMatrix();
+   glLoadIdentity();
+   glMatrixMode(GL_PROJECTION);
+   glPushMatrix();
+   glLoadIdentity();
+   glOrtho(-1, 1, -1, 1, -1, 1);
+   glRasterPos2f(-1, -1);
+
+   /* copy the image between windows */
+   glDrawBuffer(GL_FRONT);
+   glCopyPixels(0, 0, Width[0], Height[0], GL_COLOR);
+   glDrawBuffer(GL_BACK);
+
+   glPopMatrix();
+   glMatrixMode(GL_MODELVIEW);
+   glPopMatrix();
+}
+
+
+
+static void
+Resize(Window win, unsigned int width, unsigned int height)
+{
+   int i;
+   if (win == Win[0]) {
+      i = 0;
+   }
+   else {
+      i = 1;
+   }
+   Width[i] = width;
+   Height[i] = height;
+   if (!glXMakeCurrent(Dpy, Win[i], Context)) {
+      printf("glXMakeCurrent failed in Resize()\n");
+      return;
+   }
+}
+
+
+
+static void
+EventLoop(void)
+{
+   XEvent event;
+   while (1) {
+      if (XPending(Dpy) > 0) {
+         XNextEvent( Dpy, &event );
+         switch (event.type) {
+            case Expose:
+               Redraw();
+               break;
+            case ConfigureNotify:
+               Resize(event.xany.window, event.xconfigure.width, event.xconfigure.height);
+               break;
+            case KeyPress:
+               return;
+            default:
+               /*no-op*/ ;
+         }
+      }
+      else {
+         /* animate */
+         Redraw();
+      }
+   }
+}
+
+
+static void
+Init(void)
+{
+   XVisualInfo *visinfo;
+   int attrib[] = { GLX_RGBA,
+		    GLX_RED_SIZE, 1,
+		    GLX_GREEN_SIZE, 1,
+		    GLX_BLUE_SIZE, 1,
+		    GLX_DOUBLEBUFFER,
+		    None };
+
+   Dpy = XOpenDisplay(NULL);
+   if (!Dpy) {
+      printf("Couldn't open default display!\n");
+      exit(1);
+   }
+
+   ScrNum = DefaultScreen(Dpy);
+
+   visinfo = glXChooseVisual(Dpy, ScrNum, attrib);
+   if (!visinfo) {
+      printf("Unable to find RGB, double-buffered visual\n");
+      exit(1);
+   }
+
+   Context = glXCreateContext(Dpy, visinfo, NULL, True);
+   if (!Context) {
+      printf("Couldn't create GLX context\n");
+      exit(1);
+   }
+
+
+   Win[0] = CreateWindow(Dpy, ScrNum, visinfo,
+                         0, 0, 300, 300, "source window");
+
+   Win[1] = CreateWindow(Dpy, ScrNum, visinfo,
+                         350, 0, 300, 300, "dest window");
+
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   Init();
+   EventLoop();
+   return 0;
+}
+
+
+#else
+
+
+int
+main(int argc, char *argv[])
+{
+   printf("This program requires GLX 1.3!\n");
+   return 0;
+}
+
+
+#endif /* GLX_VERSION_1_3 */