added GLX multi-thread demo
This commit is contained in:
Brian Paul
420
progs/xdemos/glthreads.c
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420
progs/xdemos/glthreads.c
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/* $Id: glthreads.c,v 1.1 2000/07/20 20:12:17 brianp Exp $ */
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/*
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* Copyright (C) 2000 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 tests GLX thread safety.
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* Command line options:
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* -n <num threads> Number of threads to create (default is 2)
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* -display <display name> Specify X display (default is :0.0)
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*
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* Brian Paul 20 July 2000
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*/
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#if defined(PTHREADS) /* defined by Mesa on Linux and other platforms */
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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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#include <pthread.h>
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/*
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* Each window/thread/context:
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*/
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struct winthread {
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Display *Dpy;
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int Index;
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pthread_t Thread;
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Window Win;
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GLXContext Context;
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float Angle;
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int WinWidth, WinHeight;
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GLboolean NewSize;
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};
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#define MAX_WINTHREADS 100
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static struct winthread WinThreads[MAX_WINTHREADS];
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static int NumWinThreads = 0;
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static GLboolean ExitFlag = GL_FALSE;
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static void
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Error(const char *msg)
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{
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fprintf(stderr, "Error: %s\n", msg);
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exit(1);
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}
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/* draw a colored cube */
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static void
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draw_object(void)
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{
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glPushMatrix();
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glScalef(0.75, 0.75, 0.75);
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glColor3f(1, 0, 0);
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glBegin(GL_POLYGON);
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glVertex3f(1, -1, -1);
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glVertex3f(1, 1, -1);
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glVertex3f(1, 1, 1);
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glVertex3f(1, -1, 1);
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glEnd();
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glColor3f(0, 1, 1);
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glBegin(GL_POLYGON);
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glVertex3f(-1, -1, -1);
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glVertex3f(-1, 1, -1);
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glVertex3f(-1, 1, 1);
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glVertex3f(-1, -1, 1);
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glEnd();
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glColor3f(0, 1, 0);
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glBegin(GL_POLYGON);
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glVertex3f(-1, 1, -1);
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glVertex3f( 1, 1, -1);
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glVertex3f( 1, 1, 1);
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glVertex3f(-1, 1, 1);
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glEnd();
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glColor3f(1, 0, 1);
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glBegin(GL_POLYGON);
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glVertex3f(-1, -1, -1);
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glVertex3f( 1, -1, -1);
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glVertex3f( 1, -1, 1);
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glVertex3f(-1, -1, 1);
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glEnd();
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glColor3f(0, 0, 1);
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glBegin(GL_POLYGON);
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glVertex3f(-1, -1, 1);
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glVertex3f( 1, -1, 1);
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glVertex3f( 1, 1, 1);
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glVertex3f(-1, 1, 1);
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glEnd();
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glColor3f(1, 1, 0);
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glBegin(GL_POLYGON);
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glVertex3f(-1, -1, -1);
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glVertex3f( 1, -1, -1);
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glVertex3f( 1, 1, -1);
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glVertex3f(-1, 1, -1);
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glEnd();
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glPopMatrix();
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}
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/* signal resize of given window */
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static void
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resize(struct winthread *wt, int w, int h)
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{
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wt->NewSize = GL_TRUE;
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wt->WinWidth = w;
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wt->WinHeight = h;
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}
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/*
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* We have an instance of this for each thread.
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*/
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static void
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draw_loop(struct winthread *wt)
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{
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while (!ExitFlag) {
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glXMakeCurrent(wt->Dpy, wt->Win, wt->Context);
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glEnable(GL_DEPTH_TEST);
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if (wt->NewSize) {
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GLfloat w = (float) wt->WinWidth / (float) wt->WinHeight;
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glViewport(0, 0, wt->WinWidth, wt->WinHeight);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glFrustum(-w, w, -1.0, 1.0, 1.5, 10);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glTranslatef(0, 0, -2.5);
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wt->NewSize = GL_FALSE;
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}
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glPushMatrix();
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glRotatef(wt->Angle, 0, 0, 1);
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glRotatef(wt->Angle, 1, 0, 0);
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glScalef(0.7, 0.7, 0.7);
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draw_object();
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glPopMatrix();
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glXSwapBuffers(wt->Dpy, wt->Win);
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wt->Angle += 1.0;
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}
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}
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/*
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* The main process thread runs this loop.
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*/
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static void
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event_loop(Display *dpy)
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{
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while (!ExitFlag) {
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static long mask = StructureNotifyMask | ExposureMask | KeyPressMask;
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XEvent event;
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int i;
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for (i = 0; i < NumWinThreads; i++) {
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struct winthread *wt = &WinThreads[i];
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while (XCheckWindowEvent(dpy, wt->Win, mask, &event)) {
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if (event.xany.window == wt->Win) {
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switch (event.type) {
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case ConfigureNotify:
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resize(wt, event.xconfigure.width,
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event.xconfigure.height);
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break;
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case KeyPress:
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/* tell all threads to exit */
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ExitFlag = GL_TRUE;
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/*printf("exit draw_loop %d\n", wt->Index);*/
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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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printf("window mismatch\n");
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}
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}
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}
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}
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}
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/*
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* we'll call this once for each thread, before the threads are created.
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*/
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static void
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create_window(struct winthread *wt)
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{
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Window win;
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GLXContext ctx;
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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_DEPTH_SIZE, 1,
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GLX_DOUBLEBUFFER,
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None };
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int scrnum;
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XSetWindowAttributes attr;
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unsigned long mask;
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Window root;
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XVisualInfo *visinfo;
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int width = 80, height = 80;
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int xpos = (wt->Index % 10) * 90;
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int ypos = (wt->Index / 10) * 100;
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scrnum = DefaultScreen(wt->Dpy);
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root = RootWindow(wt->Dpy, scrnum);
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visinfo = glXChooseVisual(wt->Dpy, scrnum, attrib);
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if (!visinfo) {
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Error("Unable to find RGB, Z, double-buffered visual");
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}
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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(wt->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(wt->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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Error("Couldn't create window");
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}
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{
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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(wt->Dpy, win, &sizehints);
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XSetStandardProperties(wt->Dpy, win, "glthreads", "glthreads",
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None, (char **)NULL, 0, &sizehints);
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}
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ctx = glXCreateContext(wt->Dpy, visinfo, NULL, True);
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if (!ctx) {
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Error("Couldn't create GLX context");
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}
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XMapWindow(wt->Dpy, win);
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XSync(wt->Dpy, 0);
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/* save the info for this window/context */
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wt->Win = win;
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wt->Context = ctx;
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wt->Angle = 0.0;
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wt->WinWidth = width;
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wt->WinHeight = height;
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wt->NewSize = GL_TRUE;
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}
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/*
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* Called by pthread_create()
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*/
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static void *
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thread_function(void *p)
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{
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struct winthread *wt = (struct winthread *) p;
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draw_loop(wt);
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return NULL;
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}
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/*
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* called before exit to wait for all threads to finish
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*/
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static void
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clean_up(void)
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{
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int i;
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/* wait for threads to finish */
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for (i = 0; i < NumWinThreads; i++) {
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pthread_join(WinThreads[i].Thread, NULL);
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}
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for (i = 0; i < NumWinThreads; i++) {
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glXDestroyContext(WinThreads[i].Dpy, WinThreads[i].Context);
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XDestroyWindow(WinThreads[i].Dpy, WinThreads[i].Win);
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}
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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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char *displayName = ":0.0";
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int numThreads = 2;
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Display *dpy;
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int i;
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Status threadStat;
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if (argc == 1) {
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printf("threadgl: test of GL thread safety (any key = exit)\n");
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printf("Usage:\n");
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printf(" threadgl [-display dpyName] [-n numthreads]\n");
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}
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else {
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int i;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-display") == 0 && i + 1 < argc) {
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displayName = argv[i + 1];
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i++;
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}
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else if (strcmp(argv[i], "-n") == 0 && i + 1 < argc) {
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numThreads = atoi(argv[i + 1]);
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if (numThreads < 1)
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numThreads = 1;
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else if (numThreads > MAX_WINTHREADS)
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numThreads = MAX_WINTHREADS;
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i++;
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}
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}
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}
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/*
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* VERY IMPORTANT: call XInitThreads() before any other Xlib functions.
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*/
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threadStat = XInitThreads();
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if (threadStat) {
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printf("XInitThreads() returned %d (success)\n", (int) threadStat);
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}
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else {
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printf("XInitThreads() returned 0 (failure- this program may fail)\n");
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}
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dpy = XOpenDisplay(displayName);
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if (!dpy) {
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fprintf(stderr, "Unable to open display %s\n", displayName);
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return -1;
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}
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NumWinThreads = numThreads;
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/* Create the GLX windows and contexts */
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for (i = 0; i < numThreads; i++) {
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WinThreads[i].Dpy = dpy;
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WinThreads[i].Index = i;
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create_window(&WinThreads[i]);
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}
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/* Create the threads */
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for (i = 0; i < numThreads; i++) {
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pthread_create(&WinThreads[i].Thread, NULL, thread_function,
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(void*) &WinThreads[i]);
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printf("Created Thread %p\n", WinThreads[i].Thread);
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}
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event_loop(dpy);
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clean_up();
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XCloseDisplay(dpy);
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return 0;
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}
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#else /* PTHREADS */
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#include <stdio.h>
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int
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main(int argc, char *argv[])
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{
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printf("Sorry, this program wasn't compiled with PTHREADS defined.\n");
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return 0;
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}
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#endif /* PTHREADS */
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