/* * Mesa 3-D graphics library * Version: 6.5.2 * * Copyright (C) 1999-2006 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. */ #define GL_GLEXT_PROTOTYPES #define GLX_GLXEXT_PROTOTYPES #include #include #include #include #include #include #include #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 GLboolean TestClipping = GL_FALSE; static GLfloat Angle = 0.0; static GLboolean DrawFront = GL_FALSE; PFNGLXMAKECURRENTREADSGIPROC make_context_current = NULL; 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 (! (*make_context_current)(Dpy, Win[0], Win[0], Context)) { printf("glXMakeContextCurrent failed in Redraw()\n"); return; } Angle += 1.0; if (DrawFront) { glDrawBuffer(GL_FRONT); glReadBuffer(GL_FRONT); } else { glDrawBuffer(GL_BACK); glReadBuffer(GL_BACK); } 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, 0.0); 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(); if (DrawFront) glFinish(); else glXSwapBuffers(Dpy, Win[0]); /* copy image from window 0 to window 1 */ if (!(*make_context_current)(Dpy, Win[1], Win[0], Context)) { printf("glXMakeContextCurrent failed in Redraw()\n"); return; } /* copy the image between windows */ glClearColor(0.0, 0.0, 0.0, 0.0); glClear(GL_COLOR_BUFFER_BIT); if (TestClipping) { glWindowPos2iARB(-2, -2); glCopyPixels(-2, -2, Width[0] + 4, Height[0] + 4, GL_COLOR); } else { glWindowPos2iARB(0, 0); glCopyPixels(0, 0, Width[0], Height[0], GL_COLOR); } if (DrawFront) glFinish(); else glXSwapBuffers(Dpy, Win[1]); } 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: { char buf[100]; KeySym keySym; XComposeStatus stat; XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat); if (keySym == XK_Escape) { /* exit */ return; } else if (buf[0] == 'f') { DrawFront = !DrawFront; printf("Drawing to %s buffer\n", DrawFront ? "GL_FRONT" : "GL_BACK"); } } break; 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 }; int major, minor; Dpy = XOpenDisplay(NULL); if (!Dpy) { printf("Couldn't open default display!\n"); exit(1); } ScrNum = DefaultScreen(Dpy); glXQueryVersion(Dpy, &major, &minor); if (major * 100 + minor >= 103) { make_context_current = (PFNGLXMAKECURRENTREADSGIPROC) glXGetProcAddressARB( (GLubyte *) "glXMakeContextCurrent" ); } else { const char * const glxExtensions = glXQueryExtensionsString(Dpy, ScrNum); const char * ext = strstr( glxExtensions, "GLX_SGI_make_current_read" ); const size_t len = strlen( "GLX_SGI_make_current_read" ); if ( (ext != NULL) && ((ext[len] == ' ') || (ext[len] == '\0')) ) { make_context_current = (PFNGLXMAKECURRENTREADSGIPROC) glXGetProcAddressARB( (GLubyte *) "glXMakeCurrentReadSGI" ); } } if (make_context_current == NULL) { fprintf(stderr, "Sorry, this program requires either GLX 1.3 " "or GLX_SGI_make_current_read.\n"); exit(1); } 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"); printf("Press Esc to exit\n"); printf("Press 'f' to toggle front/back buffer drawing\n"); } int main(int argc, char *argv[]) { if (argc > 1 && strcmp(argv[1], "-clip") == 0) TestClipping = GL_TRUE; 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 */