progs/tests/sharedtex.c

   1 /* $Id: sharedtex.c,v 1.2 2002/01/16 14:32:46 joukj Exp $ */
   2
   3 /*
   4  * Test sharing of display lists and texture objects between GLX contests.
   5  * Brian Paul
   6  * Summer 2000
   7  *
   8  *
   9  * Copyright (C) 2000  Brian Paul   All Rights Reserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included
  19  * in all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  24  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  25  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  26  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29
  30 #include <GL/gl.h>
  31 #include <GL/glx.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <unistd.h>
  35 #include <string.h>
  36
  37
  38 struct window {
  39    char DisplayName[1000];
  40    Display *Dpy;
  41    Window Win;
  42    GLXContext Context;
  43    float Angle;
  44    int Id;
  45 };
  46
  47
  48 #define MAX_WINDOWS 20
  49 static struct window Windows[MAX_WINDOWS];
  50 static int NumWindows = 0;
  51
  52
  53 static GLuint Textures[3];
  54 static GLuint CubeList;
  55
  56
  57
  58 static void
  59 Error(const char *display, const char *msg)
  60 {
  61    fprintf(stderr, "Error on display %s - %s\n", display, msg);
  62    exit(1);
  63 }
  64
  65
  66 static struct window *
  67 AddWindow(const char *displayName, int xpos, int ypos,
  68           const struct window *shareWindow)
  69 {
  70    Display *dpy;
  71    Window win;
  72    GLXContext ctx;
  73    int attrib[] = { GLX_RGBA,
  74                     GLX_RED_SIZE, 1,
  75                     GLX_GREEN_SIZE, 1,
  76                     GLX_BLUE_SIZE, 1,
  77                     GLX_DOUBLEBUFFER,
  78                     GLX_DEPTH_SIZE, 1,
  79                     None };
  80    int scrnum;
  81    XSetWindowAttributes attr;
  82    unsigned long mask;
  83    Window root;
  84    XVisualInfo *visinfo;
  85    int width = 300, height = 300;
  86
  87    if (NumWindows >= MAX_WINDOWS)
  88       return NULL;
  89
  90    dpy = XOpenDisplay(displayName);
  91    if (!dpy) {
  92       Error(displayName, "Unable to open display");
  93       return NULL;
  94    }
  95
  96    scrnum = DefaultScreen(dpy);
  97    root = RootWindow(dpy, scrnum);
  98
  99    visinfo = glXChooseVisual(dpy, scrnum, attrib);
 100    if (!visinfo) {
 101       Error(displayName, "Unable to find RGB, double-buffered visual");
 102       return NULL;
 103    }
 104
 105    /* window attributes */
 106    attr.background_pixel = 0;
 107    attr.border_pixel = 0;
 108    attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
 109    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
 110    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
 111
 112    win = XCreateWindow(dpy, root, xpos, ypos, width, height,
 113                         0, visinfo->depth, InputOutput,
 114                         visinfo->visual, mask, &attr);
 115    if (!win) {
 116       Error(displayName, "Couldn't create window");
 117       return NULL;
 118    }
 119
 120    {
 121       XSizeHints sizehints;
 122       sizehints.x = xpos;
 123       sizehints.y = ypos;
 124       sizehints.width  = width;
 125       sizehints.height = height;
 126       sizehints.flags = USSize | USPosition;
 127       XSetNormalHints(dpy, win, &sizehints);
 128       XSetStandardProperties(dpy, win, displayName, displayName,
 129                               None, (char **)NULL, 0, &sizehints);
 130    }
 131
 132
 133    ctx = glXCreateContext(dpy, visinfo,
 134                           shareWindow ? shareWindow->Context : NULL,
 135                           True);
 136    if (!ctx) {
 137       Error(displayName, "Couldn't create GLX context");
 138       return NULL;
 139    }
 140
 141    XMapWindow(dpy, win);
 142
 143    if (!glXMakeCurrent(dpy, win, ctx)) {
 144       Error(displayName, "glXMakeCurrent failed");
 145       printf("glXMakeCurrent failed in Redraw()\n");
 146       return NULL;
 147    }
 148
 149    /* save the info for this window */
 150    {
 151       static int id = 0;
 152       struct window *h = &Windows[NumWindows];
 153       strcpy(h->DisplayName, displayName);
 154       h->Dpy = dpy;
 155       h->Win = win;
 156       h->Context = ctx;
 157       h->Angle = 0.0;
 158       h->Id = id++;
 159       NumWindows++;
 160       return &Windows[NumWindows-1];
 161    }
 162
 163 }
 164
 165
 166 static void
 167 InitGLstuff(struct window *h)
 168 {
 169    if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
 170       Error(h->DisplayName, "glXMakeCurrent failed in InitGLstuff");
 171       return;
 172    }
 173
 174    glGenTextures(3, Textures);
 175
 176    /* setup first texture object */
 177    {
 178       GLubyte image[16][16][4];
 179       GLint i, j;
 180       glBindTexture(GL_TEXTURE_2D, Textures[0]);
 181
 182       /* red/white checkerboard */
 183       for (i = 0; i < 16; i++) {
 184          for (j = 0; j < 16; j++) {
 185             if ((i ^ j) & 1) {
 186                image[i][j][0] = 255;
 187                image[i][j][1] = 255;
 188                image[i][j][2] = 255;
 189                image[i][j][3] = 255;
 190             }
 191             else {
 192                image[i][j][0] = 255;
 193                image[i][j][1] = 0;
 194                image[i][j][2] = 0;
 195                image[i][j][3] = 255;
 196             }
 197          }
 198       }
 199
 200       glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
 201       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA,
 202                    GL_UNSIGNED_BYTE, image);
 203       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 204       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 205    }
 206
 207    /* setup second texture object */
 208    {
 209       GLubyte image[8][8][3];
 210       GLint i, j;
 211       glBindTexture(GL_TEXTURE_2D, Textures[1]);
 212
 213       /* green/yellow checkerboard */
 214       for (i = 0; i < 8; i++) {
 215          for (j = 0; j < 8; j++) {
 216             if ((i ^ j) & 1) {
 217                image[i][j][0] = 0;
 218                image[i][j][1] = 255;
 219                image[i][j][2] = 0;
 220             }
 221             else {
 222                image[i][j][0] = 255;
 223                image[i][j][1] = 255;
 224                image[i][j][2] = 0;
 225             }
 226          }
 227       }
 228
 229       glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
 230       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB,
 231                    GL_UNSIGNED_BYTE, image);
 232       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 233       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 234    }
 235
 236    /* setup second texture object */
 237    {
 238       GLubyte image[4][4][3];
 239       GLint i, j;
 240       glBindTexture(GL_TEXTURE_2D, Textures[2]);
 241
 242       /* blue/gray checkerboard */
 243       for (i = 0; i < 4; i++) {
 244          for (j = 0; j < 4; j++) {
 245             if ((i ^ j) & 1) {
 246                image[i][j][0] = 0;
 247                image[i][j][1] = 0;
 248                image[i][j][2] = 255;
 249             }
 250             else {
 251                image[i][j][0] = 200;
 252                image[i][j][1] = 200;
 253                image[i][j][2] = 200;
 254             }
 255          }
 256       }
 257
 258       glPixelStorei(GL_UNPACK_ALIGNMENT, 2);
 259       glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 4, 4, 0, GL_RGB,
 260                    GL_UNSIGNED_BYTE, image);
 261       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
 262       glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
 263    }
 264
 265    /* Now make the cube object display list */
 266    CubeList = glGenLists(1);
 267    glNewList(CubeList, GL_COMPILE);
 268    {
 269       glBindTexture(GL_TEXTURE_2D, Textures[0]);
 270       glBegin(GL_POLYGON);
 271       glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
 272       glTexCoord2f(1, 0);  glVertex3f(-1,  1, -1);
 273       glTexCoord2f(1, 1);  glVertex3f(-1,  1,  1);
 274       glTexCoord2f(0, 1);  glVertex3f(-1, -1,  1);
 275       glEnd();
 276       glBegin(GL_POLYGON);
 277       glTexCoord2f(0, 0);  glVertex3f(1, -1, -1);
 278       glTexCoord2f(1, 0);  glVertex3f(1,  1, -1);
 279       glTexCoord2f(1, 1);  glVertex3f(1,  1,  1);
 280       glTexCoord2f(0, 1);  glVertex3f(1, -1,  1);
 281       glEnd();
 282
 283       glBindTexture(GL_TEXTURE_2D, Textures[1]);
 284       glBegin(GL_POLYGON);
 285       glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
 286       glTexCoord2f(1, 0);  glVertex3f( 1, -1, -1);
 287       glTexCoord2f(1, 1);  glVertex3f( 1, -1,  1);
 288       glTexCoord2f(0, 1);  glVertex3f(-1, -1,  1);
 289       glEnd();
 290       glBegin(GL_POLYGON);
 291       glTexCoord2f(0, 0);  glVertex3f(-1, 1, -1);
 292       glTexCoord2f(1, 0);  glVertex3f( 1, 1, -1);
 293       glTexCoord2f(1, 1);  glVertex3f( 1, 1,  1);
 294       glTexCoord2f(0, 1);  glVertex3f(-1, 1,  1);
 295       glEnd();
 296
 297       glBindTexture(GL_TEXTURE_2D, Textures[2]);
 298       glBegin(GL_POLYGON);
 299       glTexCoord2f(0, 0);  glVertex3f(-1, -1, -1);
 300       glTexCoord2f(1, 0);  glVertex3f( 1, -1, -1);
 301       glTexCoord2f(1, 1);  glVertex3f( 1,  1, -1);
 302       glTexCoord2f(0, 1);  glVertex3f(-1,  1, -1);
 303       glEnd();
 304       glBegin(GL_POLYGON);
 305       glTexCoord2f(0, 0);  glVertex3f(-1, -1, 1);
 306       glTexCoord2f(1, 0);  glVertex3f( 1, -1, 1);
 307       glTexCoord2f(1, 1);  glVertex3f( 1,  1, 1);
 308       glTexCoord2f(0, 1);  glVertex3f(-1,  1, 1);
 309       glEnd();
 310    }
 311    glEndList();
 312
 313    printf("GL_RENDERER: %s\n", (char *) glGetString(GL_RENDERER));
 314    printf("GL_VERSION: %s\n", (char *) glGetString(GL_VERSION));
 315    printf("GL_VENDOR: %s\n", (char *) glGetString(GL_VENDOR));
 316 }
 317
 318
 319
 320 static void
 321 Redraw(struct window *h)
 322 {
 323    if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
 324       Error(h->DisplayName, "glXMakeCurrent failed");
 325       printf("glXMakeCurrent failed in Redraw()\n");
 326       return;
 327    }
 328
 329    h->Angle += 1.0;
 330
 331    glShadeModel(GL_FLAT);
 332    glClearColor(0.25, 0.25, 0.25, 1.0);
 333    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 334
 335    glEnable(GL_TEXTURE_2D);
 336    glEnable(GL_DEPTH_TEST);
 337    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
 338
 339    glColor3f(1, 1, 1);
 340
 341    glPushMatrix();
 342       if (h->Id == 0)
 343          glRotatef(h->Angle, 0, 1, -1);
 344       else if (h->Id == 1)
 345          glRotatef(-(h->Angle), 0, 1, -1);
 346       else if (h->Id == 2)
 347          glRotatef(h->Angle, 0, 1, 1);
 348       else if (h->Id == 3)
 349          glRotatef(-(h->Angle), 0, 1, 1);
 350       glCallList(CubeList);
 351    glPopMatrix();
 352
 353    glXSwapBuffers(h->Dpy, h->Win);
 354 }
 355
 356
 357
 358 static void
 359 Resize(const struct window *h, unsigned int width, unsigned int height)
 360 {
 361    if (!glXMakeCurrent(h->Dpy, h->Win, h->Context)) {
 362       Error(h->DisplayName, "glXMakeCurrent failed in Resize()");
 363       return;
 364    }
 365    glViewport(0, 0, width, height);
 366    glMatrixMode(GL_PROJECTION);
 367    glLoadIdentity();
 368    glFrustum(-1, 1, -1, 1, 2, 10);
 369    glMatrixMode(GL_MODELVIEW);
 370    glLoadIdentity();
 371    glTranslatef(0, 0, -4.5);
 372 }
 373
 374
 375
 376 static void
 377 EventLoop(void)
 378 {
 379    while (1) {
 380       int i;
 381       for (i = 0; i < NumWindows; i++) {
 382          struct window *h = &Windows[i];
 383          while (XPending(h->Dpy) > 0) {
 384             XEvent event;
 385             XNextEvent(h->Dpy, &event);
 386             if (event.xany.window == h->Win) {
 387                switch (event.type) {
 388                   case Expose:
 389                      Redraw(h);
 390                      break;
 391                   case ConfigureNotify:
 392                      Resize(h, event.xconfigure.width, event.xconfigure.height);
 393                      break;
 394                   case KeyPress:
 395                      return;
 396                   default:
 397                      /*no-op*/ ;
 398                }
 399             }
 400             else {
 401                printf("window mismatch\n");
 402             }
 403          }
 404          Redraw(h);
 405       }
 406       usleep(1);
 407    }
 408 }
 409
 410
 411 #if 0
 412 static void
 413 PrintInfo(const struct window *h)
 414 {
 415    printf("Name: %s\n", h->DisplayName);
 416    printf("  Display:     %p\n", (void *) h->Dpy);
 417    printf("  Window:      0x%x\n", (int) h->Win);
 418    printf("  Context:     0x%x\n", (int) h->Context);
 419 }
 420 #endif
 421
 422
 423 int
 424 main(int argc, char *argv[])
 425 {
 426    const char *dpyName = XDisplayName(NULL);
 427
 428    struct window *h0, *h1, *h2, *h3;
 429
 430    /* four windows and contexts sharing display lists and texture objects */
 431    h0 = AddWindow(dpyName,  10,  10, NULL);
 432    h1 = AddWindow(dpyName, 330,  10, h0);
 433    h2 = AddWindow(dpyName,  10, 350, h0);
 434    h3 = AddWindow(dpyName, 330, 350, h0);
 435
 436    InitGLstuff(h0);
 437
 438    EventLoop();
 439    return 0;
 440 }