/* * Copyright (C) 2000 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 tests GLX thread safety. * Command line options: * -n <num threads> Number of threads to create (default is 2) * -display <display name> Specify X display (default is :0.0) * * Brian Paul 20 July 2000 */ #if defined(PTHREADS) /* defined by Mesa on Linux and other platforms */ #include <GL/gl.h> #include <GL/glx.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <pthread.h> /* * Each window/thread/context: */ struct winthread { Display *Dpy; int Index; pthread_t Thread; Window Win; GLXContext Context; float Angle; int WinWidth, WinHeight; GLboolean NewSize; }; #define MAX_WINTHREADS 100 static struct winthread WinThreads[MAX_WINTHREADS]; static int NumWinThreads = 0; static volatile GLboolean ExitFlag = GL_FALSE; static void Error(const char *msg) { fprintf(stderr, "Error: %s\n", msg); exit(1); } /* draw a colored cube */ static void draw_object(void) { glPushMatrix(); glScalef(0.75, 0.75, 0.75); glColor3f(1, 0, 0); glBegin(GL_POLYGON); glVertex3f(1, -1, -1); glVertex3f(1, 1, -1); glVertex3f(1, 1, 1); glVertex3f(1, -1, 1); glEnd(); glColor3f(0, 1, 1); glBegin(GL_POLYGON); glVertex3f(-1, -1, -1); glVertex3f(-1, 1, -1); glVertex3f(-1, 1, 1); glVertex3f(-1, -1, 1); glEnd(); glColor3f(0, 1, 0); glBegin(GL_POLYGON); glVertex3f(-1, 1, -1); glVertex3f( 1, 1, -1); glVertex3f( 1, 1, 1); glVertex3f(-1, 1, 1); glEnd(); glColor3f(1, 0, 1); glBegin(GL_POLYGON); glVertex3f(-1, -1, -1); glVertex3f( 1, -1, -1); glVertex3f( 1, -1, 1); glVertex3f(-1, -1, 1); glEnd(); glColor3f(0, 0, 1); glBegin(GL_POLYGON); glVertex3f(-1, -1, 1); glVertex3f( 1, -1, 1); glVertex3f( 1, 1, 1); glVertex3f(-1, 1, 1); glEnd(); glColor3f(1, 1, 0); glBegin(GL_POLYGON); glVertex3f(-1, -1, -1); glVertex3f( 1, -1, -1); glVertex3f( 1, 1, -1); glVertex3f(-1, 1, -1); glEnd(); glPopMatrix(); } /* signal resize of given window */ static void resize(struct winthread *wt, int w, int h) { wt->NewSize = GL_TRUE; wt->WinWidth = w; wt->WinHeight = h; } /* * We have an instance of this for each thread. */ static void draw_loop(struct winthread *wt) { while (!ExitFlag) { glXMakeCurrent(wt->Dpy, wt->Win, wt->Context); glEnable(GL_DEPTH_TEST); if (wt->NewSize) { GLfloat w = (float) wt->WinWidth / (float) wt->WinHeight; glViewport(0, 0, wt->WinWidth, wt->WinHeight); glMatrixMode(GL_PROJECTION); glLoadIdentity(); glFrustum(-w, w, -1.0, 1.0, 1.5, 10); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0, 0, -2.5); wt->NewSize = GL_FALSE; } glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); glRotatef(wt->Angle, 0, 0, 1); glRotatef(wt->Angle, 1, 0, 0); glScalef(0.7, 0.7, 0.7); draw_object(); glPopMatrix(); glXSwapBuffers(wt->Dpy, wt->Win); wt->Angle += 1.0; } } /* * The main process thread runs this loop. */ static void event_loop(Display *dpy) { XEvent event; int i; while (!ExitFlag) { XNextEvent(dpy, &event); switch (event.type) { case ConfigureNotify: /* Find winthread for this event's window */ for (i = 0; i < NumWinThreads; i++) { struct winthread *wt = &WinThreads[i]; if (event.xconfigure.window == wt->Win) { resize(wt, event.xconfigure.width, event.xconfigure.height); break; } } break; case KeyPress: /* tell all threads to exit */ ExitFlag = GL_TRUE; /*printf("exit draw_loop %d\n", wt->Index);*/ return; default: /*no-op*/ ; } } } /* * we'll call this once for each thread, before the threads are created. */ static void create_window(struct winthread *wt) { Window win; GLXContext ctx; int attrib[] = { GLX_RGBA, GLX_RED_SIZE, 1, GLX_GREEN_SIZE, 1, GLX_BLUE_SIZE, 1, GLX_DEPTH_SIZE, 1, GLX_DOUBLEBUFFER, None }; int scrnum; XSetWindowAttributes attr; unsigned long mask; Window root; XVisualInfo *visinfo; int width = 80, height = 80; int xpos = (wt->Index % 10) * 90; int ypos = (wt->Index / 10) * 100; scrnum = DefaultScreen(wt->Dpy); root = RootWindow(wt->Dpy, scrnum); visinfo = glXChooseVisual(wt->Dpy, scrnum, attrib); if (!visinfo) { Error("Unable to find RGB, Z, double-buffered visual"); } /* window attributes */ attr.background_pixel = 0; attr.border_pixel = 0; attr.colormap = XCreateColormap(wt->Dpy, root, visinfo->visual, AllocNone); attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask; mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask; win = XCreateWindow(wt->Dpy, root, xpos, ypos, width, height, 0, visinfo->depth, InputOutput, visinfo->visual, mask, &attr); if (!win) { Error("Couldn't create window"); } { XSizeHints sizehints; sizehints.x = xpos; sizehints.y = ypos; sizehints.width = width; sizehints.height = height; sizehints.flags = USSize | USPosition; XSetNormalHints(wt->Dpy, win, &sizehints); XSetStandardProperties(wt->Dpy, win, "glthreads", "glthreads", None, (char **)NULL, 0, &sizehints); } ctx = glXCreateContext(wt->Dpy, visinfo, NULL, True); if (!ctx) { Error("Couldn't create GLX context"); } XMapWindow(wt->Dpy, win); XSync(wt->Dpy, 0); /* save the info for this window/context */ wt->Win = win; wt->Context = ctx; wt->Angle = 0.0; wt->WinWidth = width; wt->WinHeight = height; wt->NewSize = GL_TRUE; } /* * Called by pthread_create() */ static void * thread_function(void *p) { struct winthread *wt = (struct winthread *) p; draw_loop(wt); return NULL; } /* * called before exit to wait for all threads to finish */ static void clean_up(void) { int i; /* wait for threads to finish */ for (i = 0; i < NumWinThreads; i++) { pthread_join(WinThreads[i].Thread, NULL); } for (i = 0; i < NumWinThreads; i++) { glXDestroyContext(WinThreads[i].Dpy, WinThreads[i].Context); XDestroyWindow(WinThreads[i].Dpy, WinThreads[i].Win); } } int main(int argc, char *argv[]) { char *displayName = ":0.0"; int numThreads = 2; Display *dpy; int i; Status threadStat; if (argc == 1) { printf("threadgl: test of GL thread safety (any key = exit)\n"); printf("Usage:\n"); printf(" threadgl [-display dpyName] [-n numthreads]\n"); } else { int i; for (i = 1; i < argc; i++) { if (strcmp(argv[i], "-display") == 0 && i + 1 < argc) { displayName = argv[i + 1]; i++; } else if (strcmp(argv[i], "-n") == 0 && i + 1 < argc) { numThreads = atoi(argv[i + 1]); if (numThreads < 1) numThreads = 1; else if (numThreads > MAX_WINTHREADS) numThreads = MAX_WINTHREADS; i++; } } } /* * VERY IMPORTANT: call XInitThreads() before any other Xlib functions. */ threadStat = XInitThreads(); if (threadStat) { printf("XInitThreads() returned %d (success)\n", (int) threadStat); } else { printf("XInitThreads() returned 0 (failure- this program may fail)\n"); } dpy = XOpenDisplay(displayName); if (!dpy) { fprintf(stderr, "Unable to open display %s\n", displayName); return -1; } NumWinThreads = numThreads; /* Create the GLX windows and contexts */ for (i = 0; i < numThreads; i++) { WinThreads[i].Dpy = dpy; WinThreads[i].Index = i; create_window(&WinThreads[i]); } /* Create the threads */ for (i = 0; i < numThreads; i++) { pthread_create(&WinThreads[i].Thread, NULL, thread_function, (void*) &WinThreads[i]); printf("Created Thread %d\n", (int) WinThreads[i].Thread); } event_loop(dpy); clean_up(); XCloseDisplay(dpy); return 0; } #else /* PTHREADS */ #include <stdio.h> int main(int argc, char *argv[]) { printf("Sorry, this program wasn't compiled with PTHREADS defined.\n"); return 0; } #endif /* PTHREADS */