src/tests/jkrahntest.c

   1 /* $Id: jkrahntest.c,v 1.1 2002/06/16 03:57:48 brianp Exp $ */
   2
   3 /* This is a good test for glXSwapBuffers on non-current windows,
   4  * and the glXCopyContext function.  Fixed several Mesa/DRI bugs with
   5  * this program on 15 June 2002.
   6  *
   7  * Joe's comments follow:
   8  *
   9  * I have tried some different approaches for being able to
  10  * draw to multiple windows using one context, or a copied
  11  * context. Mesa/indirect rendering works to use one context
  12  * for multiple windows, but crashes with glXCopyContext.
  13  * DRI is badly broken, at least for ATI.
  14  *
  15  * I also noticed that glXMakeCurrent allows a window and context
  16  * from different visuals to be attached (haven't tested recently).
  17  *
  18  * Joe Krahn  <jkrahn@nc.rr.com>
  19  */
  20
  21 #include <GL/glx.h>
  22 #include <GL/gl.h>
  23 #include <string.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <math.h>
  28 #define M_PI 3.14159
  29 #define DEGTOR (M_PI/180.0)
  30
  31 static int AttributeList[] = { GLX_RGBA, GLX_DOUBLEBUFFER, None };
  32
  33 int main(int argc, char **argv)
  34 {
  35     Window win1, win2;
  36     XVisualInfo *vi;
  37     XSetWindowAttributes swa;
  38     Display *dpy;
  39     GLXContext ctx1, ctx2;
  40     float angle;
  41     int test;
  42
  43     if (argc < 2) {
  44        fprintf(stderr, "This program tests GLX context switching.\n");
  45        fprintf(stderr, "Usage: cxbug <n>\n");
  46        fprintf(stderr, "Where n is:\n");
  47        fprintf(stderr, "\t1) Use two contexts and swap only when the context is current (typical case).\n");
  48        fprintf(stderr, "\t2) Use two contexts and swap at the same time.\n");
  49        fprintf(stderr, "\t\t Used to crash Mesa & nVidia, and DRI artifacts. Seems OK now.\n");
  50        fprintf(stderr, "\t3) Use one context, but only swap when a context is current.\n");
  51        fprintf(stderr, "\t\t Serious artifacts for DRI at least with ATI.\n");
  52        fprintf(stderr, "\t4) Use one context, swap both windows at the same time, so the left\n");
  53        fprintf(stderr, "\t\t window has no context at swap time. Severe artifacts for DRI.\n");
  54        fprintf(stderr, "\t5) Use two contexts, copying one to the other when switching windows.\n");
  55        fprintf(stderr, "\t\t DRI gives an error, indirect rendering crashes server.\n");
  56
  57         exit(1);
  58     }
  59     test = atoi(argv[1]);
  60
  61     /* get a connection */
  62     dpy = XOpenDisplay(NULL);
  63
  64     /* Get an appropriate visual */
  65     vi = glXChooseVisual(dpy, DefaultScreen(dpy), AttributeList);
  66     if (vi == 0) {
  67         fprintf(stderr, "No matching visuals found.\n");
  68         exit(-1);
  69     }
  70
  71     /* Create two GLX contexts, with list sharing */
  72     ctx1 = glXCreateContext(dpy, vi, 0, True);
  73     ctx2 = glXCreateContext(dpy, vi, ctx1, True);
  74
  75     /* create a colormap */
  76     swa.colormap = XCreateColormap(dpy, RootWindow(dpy, vi->screen),
  77        vi->visual, AllocNone);
  78     swa.border_pixel = 0;
  79
  80     /* Create two windows */
  81     win1 = XCreateWindow(dpy, RootWindow(dpy, vi->screen),
  82        10, 10, 200, 200,
  83        0, vi->depth, InputOutput, vi->visual,
  84        CWBorderPixel | CWColormap, &swa);
  85     XStoreName(dpy, win1, "Test [L]");
  86     XMapWindow(dpy, win1);
  87     XMoveWindow(dpy, win1, 10, 10); /* Initial requested x,y may not be honored */
  88    {
  89       XSizeHints sizehints;
  90       static const char *name = "window";
  91       sizehints.x = 10;
  92       sizehints.y = 10;
  93       sizehints.width  = 200;
  94       sizehints.height = 200;
  95       sizehints.flags = USSize | USPosition;
  96       XSetNormalHints(dpy, win1, &sizehints);
  97       XSetStandardProperties(dpy, win1, name, name,
  98                               None, (char **)NULL, 0, &sizehints);
  99    }
 100
 101
 102     win2 = XCreateWindow(dpy, RootWindow(dpy, vi->screen),
 103        250, 10, 200, 200,
 104        0, vi->depth, InputOutput, vi->visual,
 105        CWBorderPixel | CWColormap, &swa);
 106     XStoreName(dpy, win1, "Test [R]");
 107     XMapWindow(dpy, win2);
 108     XMoveWindow(dpy, win2, 260, 10);
 109    {
 110       XSizeHints sizehints;
 111       static const char *name = "window";
 112       sizehints.x = 10;
 113       sizehints.y = 10;
 114       sizehints.width  = 200;
 115       sizehints.height = 200;
 116       sizehints.flags = USSize | USPosition;
 117       XSetNormalHints(dpy, win2, &sizehints);
 118       XSetStandardProperties(dpy, win2, name, name,
 119                               None, (char **)NULL, 0, &sizehints);
 120    }
 121
 122
 123     /* Now draw some spinning things */
 124     for (angle = 0; angle < 360*4; angle += 10.0) {
 125         /* Connect the context to window 1 */
 126         glXMakeCurrent(dpy, win1, ctx1);
 127
 128         /* Clear and draw in window 1 */
 129         glDrawBuffer(GL_BACK);
 130         glClearColor(1, 1, 0, 1);
 131         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 132         glColor3f(1, 0, 0);
 133         glBegin(GL_TRIANGLES);
 134         glVertex2f(0, 0);
 135         glVertex2f(cos(angle * DEGTOR), sin(angle * DEGTOR));
 136         glVertex2f(cos((angle + 20.0) * DEGTOR),
 137            sin((angle + 20.0) * DEGTOR));
 138         glEnd();
 139         glFlush();
 140
 141         if (test == 1 || test == 3 || test == 5)
 142             glXSwapBuffers(dpy, win1);
 143
 144         if (test == 5)
 145             glXCopyContext(dpy, ctx1, ctx2, GL_ALL_ATTRIB_BITS);
 146         /* Connect the context to window 2 */
 147         if (test == 3 || test == 4) {
 148             glXMakeCurrent(dpy, win2, ctx1);
 149         } else {
 150             glXMakeCurrent(dpy, win2, ctx2);
 151         }
 152
 153         /* Clear and draw in window 2 */
 154         glDrawBuffer(GL_BACK);
 155         glClearColor(0, 0, 1, 1);
 156         glClear(GL_COLOR_BUFFER_BIT);
 157         glColor3f(1, 1, 0);
 158         glBegin(GL_TRIANGLES);
 159         glVertex2f(0, 0);
 160         glVertex2f(cos(angle * DEGTOR), sin(angle * DEGTOR));
 161         glVertex2f(cos((angle + 20.0) * DEGTOR),
 162            sin((angle + 20.0) * DEGTOR));
 163         glEnd();
 164         glFlush();
 165
 166         /* Swap buffers */
 167         if (test == 2 || test == 4)
 168             glXSwapBuffers(dpy, win1);
 169         glXSwapBuffers(dpy, win2);
 170
 171         /* wait a while */
 172         glXWaitX();
 173         usleep(20000);
 174     }
 175
 176     return 0;
 177 }