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