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  1. /*
  2.  Copyright (c) 2009 Apple Inc.
  3.  
  4.  Permission is hereby granted, free of charge, to any person
  5.  obtaining a copy of this software and associated documentation files
  6.  (the "Software"), to deal in the Software without restriction,
  7.  including without limitation the rights to use, copy, modify, merge,
  8.  publish, distribute, sublicense, and/or sell copies of the Software,
  9.  and to permit persons to whom the Software is furnished to do so,
  10.  subject to the following conditions:
  11.  
  12.  The above copyright notice and this permission notice shall be
  13.  included in all copies or substantial portions of the Software.
  14.  
  15.  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16.  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17.  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18.  NONINFRINGEMENT.  IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT
  19.  HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20.  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21.  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22.  DEALINGS IN THE SOFTWARE.
  23.  
  24.  Except as contained in this notice, the name(s) of the above
  25.  copyright holders shall not be used in advertising or otherwise to
  26.  promote the sale, use or other dealings in this Software without
  27.  prior written authorization.
  28. */
  29. #include <assert.h>
  30. #include "glxclient.h"
  31. #include "apple_glx.h"
  32. #include "appledri.h"
  33. #include "apple_glx_drawable.h"
  34.  
  35. static bool surface_make_current(struct apple_glx_context *ac,
  36.                                  struct apple_glx_drawable *d);
  37.  
  38. static void surface_destroy(Display * dpy, struct apple_glx_drawable *d);
  39.  
  40.  
  41. static struct apple_glx_drawable_callbacks callbacks = {
  42.    .type = APPLE_GLX_DRAWABLE_SURFACE,
  43.    .make_current = surface_make_current,
  44.    .destroy = surface_destroy
  45. };
  46.  
  47. static void
  48. update_viewport_and_scissor(Display * dpy, GLXDrawable drawable)
  49. {
  50.    Window root;
  51.    int x, y;
  52.    unsigned int width = 0, height = 0, bd, depth;
  53.  
  54.    XGetGeometry(dpy, drawable, &root, &x, &y, &width, &height, &bd, &depth);
  55.  
  56.    apple_glapi_oglfw_viewport_scissor(0, 0, width, height);
  57. }
  58.  
  59. static bool
  60. surface_make_current(struct apple_glx_context *ac,
  61.                      struct apple_glx_drawable *d)
  62. {
  63.    struct apple_glx_surface *s = &d->types.surface;
  64.    xp_error error;
  65.  
  66.    assert(APPLE_GLX_DRAWABLE_SURFACE == d->type);
  67.  
  68.    apple_glx_diagnostic("%s: ac->context_obj %p s->surface_id %u\n",
  69.                         __func__, (void *) ac->context_obj, s->surface_id);
  70.  
  71.    error = xp_attach_gl_context(ac->context_obj, s->surface_id);
  72.  
  73.    if (error) {
  74.       fprintf(stderr, "error: xp_attach_gl_context returned: %d\n", error);
  75.       return true;
  76.    }
  77.  
  78.  
  79.    if (!ac->made_current) {
  80.       /*
  81.        * The first time a new context is made current the glViewport
  82.        * and glScissor should be updated.
  83.        */
  84.       update_viewport_and_scissor(ac->drawable->display,
  85.                                   ac->drawable->drawable);
  86.       ac->made_current = true;
  87.    }
  88.  
  89.    apple_glx_diagnostic("%s: drawable 0x%lx\n", __func__, d->drawable);
  90.  
  91.    return false;
  92. }
  93.  
  94. static void
  95. surface_destroy(Display * dpy, struct apple_glx_drawable *d)
  96. {
  97.    struct apple_glx_surface *s = &d->types.surface;
  98.  
  99.    apple_glx_diagnostic("%s: s->surface_id %u\n", __func__, s->surface_id);
  100.  
  101.    xp_error error = xp_destroy_surface(s->surface_id);
  102.  
  103.    if (error) {
  104.       fprintf(stderr, "xp_destroy_surface error: %d\n", (int) error);
  105.    }
  106.  
  107.    /*
  108.     * Check if this surface destroy came from the surface being destroyed
  109.     * on the server.  If s->pending_destroy is true, then it did, and
  110.     * we don't want to try to destroy the surface on the server.
  111.     */
  112.    if (!s->pending_destroy) {
  113.       /*
  114.        * Warning: this causes other routines to be called (potentially)
  115.        * from surface_notify_handler.  It's probably best to not have
  116.        * any locks at this point locked.
  117.        */
  118.       XAppleDRIDestroySurface(d->display, DefaultScreen(d->display),
  119.                               d->drawable);
  120.  
  121.       apple_glx_diagnostic
  122.          ("%s: destroyed a surface for drawable 0x%lx uid %u\n", __func__,
  123.           d->drawable, s->uid);
  124.    }
  125. }
  126.  
  127. /* Return true if an error occured. */
  128. static bool
  129. create_surface(Display * dpy, int screen, struct apple_glx_drawable *d)
  130. {
  131.    struct apple_glx_surface *s = &d->types.surface;
  132.    unsigned int key[2];
  133.    xp_client_id id;
  134.  
  135.    id = apple_glx_get_client_id();
  136.    if (0 == id)
  137.       return true;
  138.  
  139.    assert(None != d->drawable);
  140.  
  141.    s->pending_destroy = false;
  142.  
  143.    if (XAppleDRICreateSurface(dpy, screen, d->drawable, id, key, &s->uid)) {
  144.       xp_error error;
  145.  
  146.       error = xp_import_surface(key, &s->surface_id);
  147.  
  148.       if (error) {
  149.          fprintf(stderr, "error: xp_import_surface returned: %d\n", error);
  150.          return true;
  151.       }
  152.  
  153.       apple_glx_diagnostic("%s: created a surface for drawable 0x%lx"
  154.                            " with uid %u\n", __func__, d->drawable, s->uid);
  155.       return false;             /*success */
  156.    }
  157.  
  158.    return true;                 /* unable to create a surface. */
  159. }
  160.  
  161. /* Return true if an error occured. */
  162. /* This returns a referenced object via resultptr. */
  163. bool
  164. apple_glx_surface_create(Display * dpy, int screen,
  165.                          GLXDrawable drawable,
  166.                          struct apple_glx_drawable ** resultptr)
  167. {
  168.    struct apple_glx_drawable *d;
  169.  
  170.    if (apple_glx_drawable_create(dpy, screen, drawable, &d, &callbacks))
  171.       return true;
  172.  
  173.    /* apple_glx_drawable_create creates a locked and referenced object. */
  174.  
  175.    if (create_surface(dpy, screen, d)) {
  176.       d->unlock(d);
  177.       d->destroy(d);
  178.       return true;
  179.    }
  180.  
  181.    *resultptr = d;
  182.  
  183.    d->unlock(d);
  184.  
  185.    return false;
  186. }
  187.  
  188. /*
  189.  * All surfaces are reference counted, and surfaces are only created
  190.  * when the window is made current.  When all contexts no longer reference
  191.  * a surface drawable the apple_glx_drawable gets destroyed, and thus
  192.  * its surface is destroyed.  
  193.  *
  194.  * However we can make the destruction occur a bit sooner by setting
  195.  * pending_destroy, which is then checked for in glViewport by
  196.  * apple_glx_context_update.
  197.  */
  198. void
  199. apple_glx_surface_destroy(unsigned int uid)
  200. {
  201.    struct apple_glx_drawable *d;
  202.  
  203.    d = apple_glx_drawable_find_by_uid(uid, APPLE_GLX_DRAWABLE_REFERENCE
  204.                                       | APPLE_GLX_DRAWABLE_LOCK);
  205.  
  206.    if (d) {
  207.       d->types.surface.pending_destroy = true;
  208.       d->release(d);
  209.  
  210.       /*
  211.        * We release 2 references to the surface.  One was acquired by
  212.        * the find, and the other was leftover from a context, or
  213.        * the surface being displayed, so the destroy() will decrease it
  214.        * once more.
  215.        *
  216.        * If the surface is in a context, it will take one d->destroy(d);
  217.        * to actually destroy it when the pending_destroy is processed
  218.        * by a glViewport callback (see apple_glx_context_update()).
  219.        */
  220.       if (!d->destroy(d)) {
  221.           /* apple_glx_drawable_find_by_uid returns a locked drawable */
  222.           d->unlock(d);
  223.       }
  224.    }
  225. }
  226.