progs/tests/texobjshare.c

   1 /*
   2  * Create several OpenGL rendering contexts, sharing textures, display
   3  * lists, etc.  Exercise binding, deleting, etc.
   4  *
   5  * Brian Paul
   6  * 21 December 2004
   7  */
   8
   9
  10 #include <GL/gl.h>
  11 #include <GL/glx.h>
  12 #include <assert.h>
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include <X11/keysym.h>
  18
  19
  20 /*
  21  * Each display/window/context:
  22  */
  23 struct context {
  24    char DisplayName[1000];
  25    Display *Dpy;
  26    Window Win;
  27    GLXContext Context;
  28 };
  29
  30
  31 #define MAX_CONTEXTS 200
  32 static struct context Contexts[MAX_CONTEXTS];
  33 static int NumContexts = 0;
  34
  35
  36 static void
  37 Error(const char *display, const char *msg)
  38 {
  39    fprintf(stderr, "Error on display %s - %s\n", display, msg);
  40    exit(1);
  41 }
  42
  43
  44 static struct context *
  45 CreateContext(const char *displayName, const char *name)
  46 {
  47    Display *dpy;
  48    Window win;
  49    GLXContext ctx;
  50    int attrib[] = { GLX_RGBA,
  51                     GLX_RED_SIZE, 1,
  52                     GLX_GREEN_SIZE, 1,
  53                     GLX_BLUE_SIZE, 1,
  54                     GLX_DOUBLEBUFFER,
  55                     None };
  56    int scrnum;
  57    XSetWindowAttributes attr;
  58    unsigned long mask;
  59    Window root;
  60    XVisualInfo *visinfo;
  61    int width = 90, height = 90;
  62    int xpos = 0, ypos = 0;
  63
  64    if (NumContexts >= MAX_CONTEXTS)
  65       return NULL;
  66
  67    dpy = XOpenDisplay(displayName);
  68    if (!dpy) {
  69       Error(displayName, "Unable to open display");
  70       return NULL;
  71    }
  72
  73    scrnum = DefaultScreen(dpy);
  74    root = RootWindow(dpy, scrnum);
  75
  76    visinfo = glXChooseVisual(dpy, scrnum, attrib);
  77    if (!visinfo) {
  78       Error(displayName, "Unable to find RGB, double-buffered visual");
  79       return NULL;
  80    }
  81
  82    /* window attributes */
  83    xpos = (NumContexts % 10) * 100;
  84    ypos = (NumContexts / 10) * 100;
  85    attr.background_pixel = 0;
  86    attr.border_pixel = 0;
  87    attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
  88    attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
  89    mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
  90
  91    win = XCreateWindow(dpy, root, xpos, ypos, width, height,
  92                         0, visinfo->depth, InputOutput,
  93                         visinfo->visual, mask, &attr);
  94    if (!win) {
  95       Error(displayName, "Couldn't create window");
  96       return NULL;
  97    }
  98
  99    {
 100       XSizeHints sizehints;
 101       sizehints.x = xpos;
 102       sizehints.y = ypos;
 103       sizehints.width  = width;
 104       sizehints.height = height;
 105       sizehints.flags = USSize | USPosition;
 106       XSetNormalHints(dpy, win, &sizehints);
 107       XSetStandardProperties(dpy, win, name, name,
 108                               None, (char **)NULL, 0, &sizehints);
 109    }
 110
 111    if (NumContexts == 0) {
 112       ctx = glXCreateContext(dpy, visinfo, NULL, True);
 113    }
 114    else {
 115       /* share textures & dlists with 0th context */
 116       ctx = glXCreateContext(dpy, visinfo, Contexts[0].Context, True);
 117    }
 118    if (!ctx) {
 119       Error(displayName, "Couldn't create GLX context");
 120       return NULL;
 121    }
 122
 123    XMapWindow(dpy, win);
 124
 125    if (!glXMakeCurrent(dpy, win, ctx)) {
 126       Error(displayName, "glXMakeCurrent failed");
 127       return NULL;
 128    }
 129
 130    if (NumContexts == 0) {
 131       printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 132    }
 133
 134    /* save the info for this context */
 135    {
 136       struct context *h = &Contexts[NumContexts];
 137       strcpy(h->DisplayName, name);
 138       h->Dpy = dpy;
 139       h->Win = win;
 140       h->Context = ctx;
 141       NumContexts++;
 142       return &Contexts[NumContexts-1];
 143    }
 144 }
 145
 146
 147 static void
 148 MakeCurrent(int i)
 149 {
 150    if (!glXMakeCurrent(Contexts[i].Dpy, Contexts[i].Win, Contexts[i].Context)) {
 151       fprintf(stderr, "glXMakeCurrent failed!\n");
 152    }
 153 }
 154
 155
 156
 157 static void
 158 DestroyContext(int i)
 159 {
 160    XDestroyWindow(Contexts[i].Dpy, Contexts[i].Win);
 161    glXDestroyContext(Contexts[i].Dpy, Contexts[i].Context);
 162    XCloseDisplay(Contexts[i].Dpy);
 163 }
 164
 165
 166 int
 167 main(int argc, char *argv[])
 168 {
 169    char *dpyName = NULL;
 170    int i;
 171    GLuint t;
 172    GLint tb;
 173
 174    for (i = 0; i < 2; i++) {
 175       CreateContext(dpyName, "context");
 176    }
 177
 178    /* Create texture and bind it in context 0 */
 179    MakeCurrent(0);
 180    glGenTextures(1, &t);
 181    printf("Generated texture ID %u\n", t);
 182    assert(!glIsTexture(t));
 183    glBindTexture(GL_TEXTURE_2D, t);
 184    assert(glIsTexture(t));
 185    glGetIntegerv(GL_TEXTURE_BINDING_2D, &tb);
 186    assert(tb == t);
 187
 188    /* Bind texture in context 1 */
 189    MakeCurrent(1);
 190    assert(glIsTexture(t));
 191    glBindTexture(GL_TEXTURE_2D, t);
 192    glGetIntegerv(GL_TEXTURE_BINDING_2D, &tb);
 193    assert(tb == t);
 194
 195    /* Delete texture from context 0 */
 196    MakeCurrent(0);
 197    glDeleteTextures(1, &t);
 198    assert(!glIsTexture(t));
 199    glGetIntegerv(GL_TEXTURE_BINDING_2D, &tb);
 200    printf("After delete, binding = %d\n", tb);
 201
 202    /* Check texture state from context 1 */
 203    MakeCurrent(1);
 204    assert(!glIsTexture(t));
 205    glGetIntegerv(GL_TEXTURE_BINDING_2D, &tb);
 206    printf("In second context, binding = %d\n", tb);
 207    glBindTexture(GL_TEXTURE_2D, 0);
 208    glGetIntegerv(GL_TEXTURE_BINDING_2D, &tb);
 209    assert(tb == 0);
 210
 211
 212    for (i = 0; i < NumContexts; i++) {
 213       DestroyContext(i);
 214    }
 215
 216    printf("Success!\n");
 217
 218    return 0;
 219 }