dri: add __DRI_IMAGE_FORMAT_SXRGB8
[mesa.git] / src / loader / loader_dri3_helper.c
index 51e4e97fb25f6b403551df08409456c3a68068ca..45e1c102ed152692e5b78c85584164dd88d25242 100644 (file)
@@ -24,6 +24,7 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <unistd.h>
+#include <string.h>
 
 #include <X11/xshmfence.h>
 #include <xcb/xcb.h>
@@ -32,8 +33,9 @@
 
 #include <X11/Xlib-xcb.h>
 
-#include <c11/threads.h>
 #include "loader_dri3_helper.h"
+#include "util/macros.h"
+#include "drm-uapi/drm_fourcc.h"
 
 /* From xmlpool/options.h, user exposed so should be stable */
 #define DRI_CONF_VBLANK_NEVER 0
@@ -62,6 +64,81 @@ dri3_flush_present_events(struct loader_dri3_drawable *draw);
 static struct loader_dri3_buffer *
 dri3_find_back_alloc(struct loader_dri3_drawable *draw);
 
+static xcb_screen_t *
+get_screen_for_root(xcb_connection_t *conn, xcb_window_t root)
+{
+   xcb_screen_iterator_t screen_iter =
+   xcb_setup_roots_iterator(xcb_get_setup(conn));
+
+   for (; screen_iter.rem; xcb_screen_next (&screen_iter)) {
+      if (screen_iter.data->root == root)
+         return screen_iter.data;
+   }
+
+   return NULL;
+}
+
+static xcb_visualtype_t *
+get_xcb_visualtype_for_depth(struct loader_dri3_drawable *draw, int depth)
+{
+   xcb_visualtype_iterator_t visual_iter;
+   xcb_screen_t *screen = draw->screen;
+   xcb_depth_iterator_t depth_iter;
+
+   if (!screen)
+      return NULL;
+
+   depth_iter = xcb_screen_allowed_depths_iterator(screen);
+   for (; depth_iter.rem; xcb_depth_next(&depth_iter)) {
+      if (depth_iter.data->depth != depth)
+         continue;
+
+      visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
+      if (visual_iter.rem)
+         return visual_iter.data;
+   }
+
+   return NULL;
+}
+
+/* Sets the adaptive sync window property state. */
+static void
+set_adaptive_sync_property(xcb_connection_t *conn, xcb_drawable_t drawable,
+                           uint32_t state)
+{
+   static char const name[] = "_VARIABLE_REFRESH";
+   xcb_intern_atom_cookie_t cookie;
+   xcb_intern_atom_reply_t* reply;
+   xcb_void_cookie_t check;
+
+   cookie = xcb_intern_atom(conn, 0, strlen(name), name);
+   reply = xcb_intern_atom_reply(conn, cookie, NULL);
+   if (reply == NULL)
+      return;
+
+   if (state)
+      check = xcb_change_property_checked(conn, XCB_PROP_MODE_REPLACE,
+                                          drawable, reply->atom,
+                                          XCB_ATOM_CARDINAL, 32, 1, &state);
+   else
+      check = xcb_delete_property_checked(conn, drawable, reply->atom);
+
+   xcb_discard_reply(conn, check.sequence);
+   free(reply);
+}
+
+/* Get red channel mask for given drawable at given depth. */
+static unsigned int
+dri3_get_red_mask_for_depth(struct loader_dri3_drawable *draw, int depth)
+{
+   xcb_visualtype_t *visual = get_xcb_visualtype_for_depth(draw, depth);
+
+   if (visual)
+      return visual->red_mask;
+
+   return 0;
+}
+
 /**
  * Do we have blit functionality in the image blit extension?
  *
@@ -186,14 +263,17 @@ dri3_fence_await(xcb_connection_t *c, struct loader_dri3_drawable *draw,
 {
    xcb_flush(c);
    xshmfence_await(buffer->shm_fence);
-   if (draw)
+   if (draw) {
+      mtx_lock(&draw->mtx);
       dri3_flush_present_events(draw);
+      mtx_unlock(&draw->mtx);
+   }
 }
 
 static void
 dri3_update_num_back(struct loader_dri3_drawable *draw)
 {
-   if (draw->flipping)
+   if (draw->last_present_mode == XCB_PRESENT_COMPLETE_MODE_FLIP)
       draw->num_back = 3;
    else
       draw->num_back = 2;
@@ -203,7 +283,6 @@ void
 loader_dri3_set_swap_interval(struct loader_dri3_drawable *draw, int interval)
 {
    draw->swap_interval = interval;
-   dri3_update_num_back(draw);
 }
 
 /** dri3_free_render_buffer
@@ -232,7 +311,7 @@ loader_dri3_drawable_fini(struct loader_dri3_drawable *draw)
 
    draw->ext->core->destroyDrawable(draw->dri_drawable);
 
-   for (i = 0; i < LOADER_DRI3_NUM_BUFFERS; i++) {
+   for (i = 0; i < ARRAY_SIZE(draw->buffers); i++) {
       if (draw->buffers[i])
          dri3_free_render_buffer(draw, draw->buffers[i]);
    }
@@ -245,6 +324,9 @@ loader_dri3_drawable_fini(struct loader_dri3_drawable *draw)
       xcb_discard_reply(draw->conn, cookie.sequence);
       xcb_unregister_for_special_event(draw->conn, draw->special_event);
    }
+
+   cnd_destroy(&draw->event_cnd);
+   mtx_destroy(&draw->mtx);
 }
 
 int
@@ -252,6 +334,7 @@ loader_dri3_drawable_init(xcb_connection_t *conn,
                           xcb_drawable_t drawable,
                           __DRIscreen *dri_screen,
                           bool is_different_gpu,
+                          bool multiplanes_available,
                           const __DRIconfig *dri_config,
                           struct loader_dri3_extensions *ext,
                           const struct loader_dri3_vtable *vtable,
@@ -269,18 +352,35 @@ loader_dri3_drawable_init(xcb_connection_t *conn,
    draw->drawable = drawable;
    draw->dri_screen = dri_screen;
    draw->is_different_gpu = is_different_gpu;
+   draw->multiplanes_available = multiplanes_available;
 
    draw->have_back = 0;
    draw->have_fake_front = 0;
    draw->first_init = true;
+   draw->adaptive_sync = false;
+   draw->adaptive_sync_active = false;
 
    draw->cur_blit_source = -1;
    draw->back_format = __DRI_IMAGE_FORMAT_NONE;
+   mtx_init(&draw->mtx, mtx_plain);
+   cnd_init(&draw->event_cnd);
+
+   if (draw->ext->config) {
+      unsigned char adaptive_sync = 0;
 
-   if (draw->ext->config)
       draw->ext->config->configQueryi(draw->dri_screen,
                                       "vblank_mode", &vblank_mode);
 
+      draw->ext->config->configQueryb(draw->dri_screen,
+                                      "adaptive_sync",
+                                      &adaptive_sync);
+
+      draw->adaptive_sync = adaptive_sync;
+   }
+
+   if (!draw->adaptive_sync)
+      set_adaptive_sync_property(conn, draw->drawable, false);
+
    switch (vblank_mode) {
    case DRI_CONF_VBLANK_NEVER:
    case DRI_CONF_VBLANK_DEF_INTERVAL_0:
@@ -312,6 +412,7 @@ loader_dri3_drawable_init(xcb_connection_t *conn,
       return 1;
    }
 
+   draw->screen = get_screen_for_root(draw->conn, reply->root);
    draw->width = reply->width;
    draw->height = reply->height;
    draw->depth = reply->depth;
@@ -348,6 +449,7 @@ dri3_handle_present_event(struct loader_dri3_drawable *draw,
       draw->width = ce->width;
       draw->height = ce->height;
       draw->vtable->set_drawable_size(draw, draw->width, draw->height);
+      draw->ext->flush->invalidate(draw->dri_drawable);
       break;
    }
    case XCB_PRESENT_COMPLETE_NOTIFY: {
@@ -358,26 +460,50 @@ dri3_handle_present_event(struct loader_dri3_drawable *draw,
        * checking for wrap.
        */
       if (ce->kind == XCB_PRESENT_COMPLETE_KIND_PIXMAP) {
-         draw->recv_sbc = (draw->send_sbc & 0xffffffff00000000LL) | ce->serial;
-         if (draw->recv_sbc > draw->send_sbc)
-            draw->recv_sbc -= 0x100000000;
-         switch (ce->mode) {
-         case XCB_PRESENT_COMPLETE_MODE_FLIP:
-            draw->flipping = true;
-            break;
-         case XCB_PRESENT_COMPLETE_MODE_COPY:
-            draw->flipping = false;
-            break;
+         uint64_t recv_sbc = (draw->send_sbc & 0xffffffff00000000LL) | ce->serial;
+
+         /* Only assume wraparound if that results in exactly the previous
+          * SBC + 1, otherwise ignore received SBC > sent SBC (those are
+          * probably from a previous loader_dri3_drawable instance) to avoid
+          * calculating bogus target MSC values in loader_dri3_swap_buffers_msc
+          */
+         if (recv_sbc <= draw->send_sbc)
+            draw->recv_sbc = recv_sbc;
+         else if (recv_sbc == (draw->recv_sbc + 0x100000001ULL))
+            draw->recv_sbc = recv_sbc - 0x100000000ULL;
+
+         /* When moving from flip to copy, we assume that we can allocate in
+          * a more optimal way if we don't need to cater for the display
+          * controller.
+          */
+         if (ce->mode == XCB_PRESENT_COMPLETE_MODE_COPY &&
+             draw->last_present_mode == XCB_PRESENT_COMPLETE_MODE_FLIP) {
+            for (int b = 0; b < ARRAY_SIZE(draw->buffers); b++) {
+               if (draw->buffers[b])
+                  draw->buffers[b]->reallocate = true;
+            }
          }
-         dri3_update_num_back(draw);
+
+         /* If the server tells us that our allocation is suboptimal, we
+          * reallocate once.
+          */
+#ifdef HAVE_DRI3_MODIFIERS
+         if (ce->mode == XCB_PRESENT_COMPLETE_MODE_SUBOPTIMAL_COPY &&
+             draw->last_present_mode != ce->mode) {
+            for (int b = 0; b < ARRAY_SIZE(draw->buffers); b++) {
+               if (draw->buffers[b])
+                  draw->buffers[b]->reallocate = true;
+            }
+         }
+#endif
+         draw->last_present_mode = ce->mode;
 
          if (draw->vtable->show_fps)
             draw->vtable->show_fps(draw, ce->ust);
 
          draw->ust = ce->ust;
          draw->msc = ce->msc;
-      } else {
-         draw->recv_msc_serial = ce->serial;
+      } else if (ce->serial == draw->eid) {
          draw->notify_ust = ce->ust;
          draw->notify_msc = ce->msc;
       }
@@ -387,17 +513,11 @@ dri3_handle_present_event(struct loader_dri3_drawable *draw,
       xcb_present_idle_notify_event_t *ie = (void *) ge;
       int b;
 
-      for (b = 0; b < sizeof(draw->buffers) / sizeof(draw->buffers[0]); b++) {
+      for (b = 0; b < ARRAY_SIZE(draw->buffers); b++) {
          struct loader_dri3_buffer *buf = draw->buffers[b];
 
-         if (buf && buf->pixmap == ie->pixmap) {
+         if (buf && buf->pixmap == ie->pixmap)
             buf->busy = 0;
-            if (draw->num_back <= b && b < LOADER_DRI3_MAX_BACK) {
-               dri3_free_render_buffer(draw, buf);
-               draw->buffers[b] = NULL;
-            }
-            break;
-         }
       }
       break;
    }
@@ -406,13 +526,27 @@ dri3_handle_present_event(struct loader_dri3_drawable *draw,
 }
 
 static bool
-dri3_wait_for_event(struct loader_dri3_drawable *draw)
+dri3_wait_for_event_locked(struct loader_dri3_drawable *draw)
 {
    xcb_generic_event_t *ev;
    xcb_present_generic_event_t *ge;
 
    xcb_flush(draw->conn);
-   ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
+
+   /* Only have one thread waiting for events at a time */
+   if (draw->has_event_waiter) {
+      cnd_wait(&draw->event_cnd, &draw->mtx);
+      /* Another thread has updated the protected info, so retest. */
+      return true;
+   } else {
+      draw->has_event_waiter = true;
+      /* Allow other threads access to the drawable while we're waiting. */
+      mtx_unlock(&draw->mtx);
+      ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
+      mtx_lock(&draw->mtx);
+      draw->has_event_waiter = false;
+      cnd_broadcast(&draw->event_cnd);
+   }
    if (!ev)
       return false;
    ge = (void *) ev;
@@ -431,29 +565,34 @@ loader_dri3_wait_for_msc(struct loader_dri3_drawable *draw,
                          int64_t divisor, int64_t remainder,
                          int64_t *ust, int64_t *msc, int64_t *sbc)
 {
-   uint32_t msc_serial;
-
-   msc_serial = ++draw->send_msc_serial;
-   xcb_present_notify_msc(draw->conn,
-                          draw->drawable,
-                          msc_serial,
-                          target_msc,
-                          divisor,
-                          remainder);
+   xcb_void_cookie_t cookie = xcb_present_notify_msc(draw->conn,
+                                                     draw->drawable,
+                                                     draw->eid,
+                                                     target_msc,
+                                                     divisor,
+                                                     remainder);
+   xcb_generic_event_t *ev;
+   unsigned full_sequence;
 
+   mtx_lock(&draw->mtx);
    xcb_flush(draw->conn);
 
    /* Wait for the event */
-   if (draw->special_event) {
-      while ((int32_t) (msc_serial - draw->recv_msc_serial) > 0) {
-         if (!dri3_wait_for_event(draw))
-            return false;
+   do {
+      ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
+      if (!ev) {
+         mtx_unlock(&draw->mtx);
+         return false;
       }
-   }
+
+      full_sequence = ev->full_sequence;
+      dri3_handle_present_event(draw, (void *) ev);
+   } while (full_sequence != cookie.sequence || draw->notify_msc < target_msc);
 
    *ust = draw->notify_ust;
    *msc = draw->notify_msc;
    *sbc = draw->recv_sbc;
+   mtx_unlock(&draw->mtx);
 
    return true;
 }
@@ -475,17 +614,21 @@ loader_dri3_wait_for_sbc(struct loader_dri3_drawable *draw,
     *      swaps requested with glXSwapBuffersMscOML for that window have
     *      completed."
     */
+   mtx_lock(&draw->mtx);
    if (!target_sbc)
       target_sbc = draw->send_sbc;
 
    while (draw->recv_sbc < target_sbc) {
-      if (!dri3_wait_for_event(draw))
+      if (!dri3_wait_for_event_locked(draw)) {
+         mtx_unlock(&draw->mtx);
          return 0;
+      }
    }
 
    *ust = draw->ust;
    *msc = draw->msc;
    *sbc = draw->recv_sbc;
+   mtx_unlock(&draw->mtx);
    return 1;
 }
 
@@ -498,16 +641,16 @@ static int
 dri3_find_back(struct loader_dri3_drawable *draw)
 {
    int b;
-   xcb_generic_event_t *ev;
-   xcb_present_generic_event_t *ge;
-   int num_to_consider = draw->num_back;
+   int num_to_consider;
 
+   mtx_lock(&draw->mtx);
    /* Increase the likelyhood of reusing current buffer */
    dri3_flush_present_events(draw);
 
    /* Check whether we need to reuse the current back buffer as new back.
     * In that case, wait until it's not busy anymore.
     */
+   num_to_consider = draw->num_back;
    if (!loader_dri3_have_image_blit(draw) && draw->cur_blit_source != -1) {
       num_to_consider = 1;
       draw->cur_blit_source = -1;
@@ -520,15 +663,14 @@ dri3_find_back(struct loader_dri3_drawable *draw)
 
          if (!buffer || !buffer->busy) {
             draw->cur_back = id;
+            mtx_unlock(&draw->mtx);
             return id;
          }
       }
-      xcb_flush(draw->conn);
-      ev = xcb_wait_for_special_event(draw->conn, draw->special_event);
-      if (!ev)
+      if (!dri3_wait_for_event_locked(draw)) {
+         mtx_unlock(&draw->mtx);
          return -1;
-      ge = (void *) ev;
-      dri3_handle_present_event(draw, ge);
+      }
    }
 }
 
@@ -621,7 +763,7 @@ loader_dri3_copy_sub_buffer(struct loader_dri3_drawable *draw,
 
    if (flush)
       flags |= __DRI2_FLUSH_CONTEXT;
-   loader_dri3_flush(draw, flags, __DRI2_THROTTLE_SWAPBUFFER);
+   loader_dri3_flush(draw, flags, __DRI2_THROTTLE_COPYSUBBUFFER);
 
    back = dri3_find_back_alloc(draw);
    if (!back)
@@ -675,7 +817,7 @@ loader_dri3_copy_drawable(struct loader_dri3_drawable *draw,
                           xcb_drawable_t dest,
                           xcb_drawable_t src)
 {
-   loader_dri3_flush(draw, __DRI2_FLUSH_DRAWABLE, 0);
+   loader_dri3_flush(draw, __DRI2_FLUSH_DRAWABLE, __DRI2_THROTTLE_COPYSUBBUFFER);
 
    dri3_fence_reset(draw->conn, dri3_fake_front_buffer(draw));
    dri3_copy_area(draw->conn,
@@ -744,6 +886,9 @@ dri3_flush_present_events(struct loader_dri3_drawable *draw)
    /* Check to see if any configuration changes have occurred
     * since we were last invoked
     */
+   if (draw->has_event_waiter)
+      return;
+
    if (draw->special_event) {
       xcb_generic_event_t    *ev;
 
@@ -773,6 +918,13 @@ loader_dri3_swap_buffers_msc(struct loader_dri3_drawable *draw,
 
    back = dri3_find_back_alloc(draw);
 
+   mtx_lock(&draw->mtx);
+
+   if (draw->adaptive_sync && !draw->adaptive_sync_active) {
+      set_adaptive_sync_property(draw->conn, draw->drawable, true);
+      draw->adaptive_sync_active = true;
+   }
+
    if (draw->is_different_gpu && back) {
       /* Update the linear buffer before presenting the pixmap */
       (void) loader_dri3_blit_image(draw,
@@ -848,7 +1000,10 @@ loader_dri3_swap_buffers_msc(struct loader_dri3_drawable *draw,
        */
       if (!loader_dri3_have_image_blit(draw) && draw->cur_blit_source != -1)
          options |= XCB_PRESENT_OPTION_COPY;
-
+#ifdef HAVE_DRI3_MODIFIERS
+      if (draw->multiplanes_available)
+         options |= XCB_PRESENT_OPTION_SUBOPTIMAL;
+#endif
       back->busy = 1;
       back->last_swap = draw->send_sbc;
       xcb_present_pixmap(draw->conn,
@@ -892,6 +1047,7 @@ loader_dri3_swap_buffers_msc(struct loader_dri3_drawable *draw,
       if (draw->stamp)
          ++(*draw->stamp);
    }
+   mtx_unlock(&draw->mtx);
 
    draw->ext->flush->invalidate(draw->dri_drawable);
 
@@ -902,11 +1058,14 @@ int
 loader_dri3_query_buffer_age(struct loader_dri3_drawable *draw)
 {
    struct loader_dri3_buffer *back = dri3_find_back_alloc(draw);
+   int ret;
 
-   if (!back || back->last_swap == 0)
-      return 0;
+   mtx_lock(&draw->mtx);
+   ret = (!back || back->last_swap == 0) ? 0 :
+      draw->send_sbc - back->last_swap + 1;
+   mtx_unlock(&draw->mtx);
 
-   return draw->send_sbc - back->last_swap + 1;
+   return ret;
 }
 
 /** loader_dri3_open
@@ -956,35 +1115,117 @@ dri3_cpp_for_format(uint32_t format) {
    case  __DRI_IMAGE_FORMAT_XBGR8888:
    case  __DRI_IMAGE_FORMAT_XRGB2101010:
    case  __DRI_IMAGE_FORMAT_ARGB2101010:
+   case  __DRI_IMAGE_FORMAT_XBGR2101010:
+   case  __DRI_IMAGE_FORMAT_ABGR2101010:
    case  __DRI_IMAGE_FORMAT_SARGB8:
+   case  __DRI_IMAGE_FORMAT_SABGR8:
+   case  __DRI_IMAGE_FORMAT_SXRGB8:
       return 4;
+   case __DRI_IMAGE_FORMAT_XBGR16161616F:
+   case __DRI_IMAGE_FORMAT_ABGR16161616F:
+      return 8;
    case  __DRI_IMAGE_FORMAT_NONE:
    default:
       return 0;
    }
 }
 
+/* Map format of render buffer to corresponding format for the linear_buffer
+ * used for sharing with the display gpu of a Prime setup (== is_different_gpu).
+ * Usually linear_format == format, except for depth >= 30 formats, where
+ * different gpu vendors have different preferences wrt. color channel ordering.
+ */
+static uint32_t
+dri3_linear_format_for_format(struct loader_dri3_drawable *draw, uint32_t format)
+{
+   switch (format) {
+      case  __DRI_IMAGE_FORMAT_XRGB2101010:
+      case  __DRI_IMAGE_FORMAT_XBGR2101010:
+         /* Different preferred formats for different hw */
+         if (dri3_get_red_mask_for_depth(draw, 30) == 0x3ff)
+            return __DRI_IMAGE_FORMAT_XBGR2101010;
+         else
+            return __DRI_IMAGE_FORMAT_XRGB2101010;
+
+      case  __DRI_IMAGE_FORMAT_ARGB2101010:
+      case  __DRI_IMAGE_FORMAT_ABGR2101010:
+         /* Different preferred formats for different hw */
+         if (dri3_get_red_mask_for_depth(draw, 30) == 0x3ff)
+            return __DRI_IMAGE_FORMAT_ABGR2101010;
+         else
+            return __DRI_IMAGE_FORMAT_ARGB2101010;
+
+      default:
+         return format;
+   }
+}
+
 /* the DRIimage createImage function takes __DRI_IMAGE_FORMAT codes, while
- * the createImageFromFds call takes __DRI_IMAGE_FOURCC codes. To avoid
+ * the createImageFromFds call takes DRM_FORMAT codes. To avoid
  * complete confusion, just deal in __DRI_IMAGE_FORMAT codes for now and
- * translate to __DRI_IMAGE_FOURCC codes in the call to createImageFromFds
+ * translate to DRM_FORMAT codes in the call to createImageFromFds
  */
 static int
 image_format_to_fourcc(int format)
 {
 
-   /* Convert from __DRI_IMAGE_FORMAT to __DRI_IMAGE_FOURCC (sigh) */
+   /* Convert from __DRI_IMAGE_FORMAT to DRM_FORMAT (sigh) */
    switch (format) {
    case __DRI_IMAGE_FORMAT_SARGB8: return __DRI_IMAGE_FOURCC_SARGB8888;
-   case __DRI_IMAGE_FORMAT_RGB565: return __DRI_IMAGE_FOURCC_RGB565;
-   case __DRI_IMAGE_FORMAT_XRGB8888: return __DRI_IMAGE_FOURCC_XRGB8888;
-   case __DRI_IMAGE_FORMAT_ARGB8888: return __DRI_IMAGE_FOURCC_ARGB8888;
-   case __DRI_IMAGE_FORMAT_ABGR8888: return __DRI_IMAGE_FOURCC_ABGR8888;
-   case __DRI_IMAGE_FORMAT_XBGR8888: return __DRI_IMAGE_FOURCC_XBGR8888;
+   case __DRI_IMAGE_FORMAT_SABGR8: return __DRI_IMAGE_FOURCC_SABGR8888;
+   case __DRI_IMAGE_FORMAT_SXRGB8: return __DRI_IMAGE_FOURCC_SXRGB8888;
+   case __DRI_IMAGE_FORMAT_RGB565: return DRM_FORMAT_RGB565;
+   case __DRI_IMAGE_FORMAT_XRGB8888: return DRM_FORMAT_XRGB8888;
+   case __DRI_IMAGE_FORMAT_ARGB8888: return DRM_FORMAT_ARGB8888;
+   case __DRI_IMAGE_FORMAT_ABGR8888: return DRM_FORMAT_ABGR8888;
+   case __DRI_IMAGE_FORMAT_XBGR8888: return DRM_FORMAT_XBGR8888;
+   case __DRI_IMAGE_FORMAT_XRGB2101010: return DRM_FORMAT_XRGB2101010;
+   case __DRI_IMAGE_FORMAT_ARGB2101010: return DRM_FORMAT_ARGB2101010;
+   case __DRI_IMAGE_FORMAT_XBGR2101010: return DRM_FORMAT_XBGR2101010;
+   case __DRI_IMAGE_FORMAT_ABGR2101010: return DRM_FORMAT_ABGR2101010;
+   case __DRI_IMAGE_FORMAT_XBGR16161616F: return DRM_FORMAT_XBGR16161616F;
+   case __DRI_IMAGE_FORMAT_ABGR16161616F: return DRM_FORMAT_ABGR16161616F;
    }
    return 0;
 }
 
+#ifdef HAVE_DRI3_MODIFIERS
+static bool
+has_supported_modifier(struct loader_dri3_drawable *draw, unsigned int format,
+                       uint64_t *modifiers, uint32_t count)
+{
+   uint64_t *supported_modifiers;
+   int32_t supported_modifiers_count;
+   bool found = false;
+   int i, j;
+
+   if (!draw->ext->image->queryDmaBufModifiers(draw->dri_screen,
+                                               format, 0, NULL, NULL,
+                                               &supported_modifiers_count) ||
+       supported_modifiers_count == 0)
+      return false;
+
+   supported_modifiers = malloc(supported_modifiers_count * sizeof(uint64_t));
+   if (!supported_modifiers)
+      return false;
+
+   draw->ext->image->queryDmaBufModifiers(draw->dri_screen, format,
+                                          supported_modifiers_count,
+                                          supported_modifiers, NULL,
+                                          &supported_modifiers_count);
+
+   for (i = 0; !found && i < supported_modifiers_count; i++) {
+      for (j = 0; !found && j < count; j++) {
+         if (supported_modifiers[i] == modifiers[j])
+            found = true;
+      }
+   }
+
+   free(supported_modifiers);
+   return found;
+}
+#endif
+
 /** loader_dri3_alloc_render_buffer
  *
  * Use the driver createImage function to construct a __DRIimage, then
@@ -1001,8 +1242,10 @@ dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int format,
    xcb_pixmap_t pixmap;
    xcb_sync_fence_t sync_fence;
    struct xshmfence *shm_fence;
-   int buffer_fd, fence_fd;
-   int stride;
+   int buffer_fds[4], fence_fd;
+   int num_planes = 0;
+   int i, mod;
+   int ret;
 
    /* Create an xshmfence object and
     * prepare to send that to the X server
@@ -1027,13 +1270,88 @@ dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int format,
       goto no_image;
 
    if (!draw->is_different_gpu) {
-      buffer->image = draw->ext->image->createImage(draw->dri_screen,
-                                                    width, height,
-                                                    format,
-                                                    __DRI_IMAGE_USE_SHARE |
-                                                    __DRI_IMAGE_USE_SCANOUT |
-                                                    __DRI_IMAGE_USE_BACKBUFFER,
-                                                    buffer);
+#ifdef HAVE_DRI3_MODIFIERS
+      if (draw->multiplanes_available &&
+          draw->ext->image->base.version >= 15 &&
+          draw->ext->image->queryDmaBufModifiers &&
+          draw->ext->image->createImageWithModifiers) {
+         xcb_dri3_get_supported_modifiers_cookie_t mod_cookie;
+         xcb_dri3_get_supported_modifiers_reply_t *mod_reply;
+         xcb_generic_error_t *error = NULL;
+         uint64_t *modifiers = NULL;
+         uint32_t count = 0;
+
+         mod_cookie = xcb_dri3_get_supported_modifiers(draw->conn,
+                                                       draw->window,
+                                                       depth, buffer->cpp * 8);
+         mod_reply = xcb_dri3_get_supported_modifiers_reply(draw->conn,
+                                                            mod_cookie,
+                                                            &error);
+         if (!mod_reply)
+            goto no_image;
+
+         if (mod_reply->num_window_modifiers) {
+            count = mod_reply->num_window_modifiers;
+            modifiers = malloc(count * sizeof(uint64_t));
+            if (!modifiers) {
+               free(mod_reply);
+               goto no_image;
+            }
+
+            memcpy(modifiers,
+                   xcb_dri3_get_supported_modifiers_window_modifiers(mod_reply),
+                   count * sizeof(uint64_t));
+
+            if (!has_supported_modifier(draw, image_format_to_fourcc(format),
+                                        modifiers, count)) {
+               free(modifiers);
+               count = 0;
+               modifiers = NULL;
+            }
+         }
+
+         if (mod_reply->num_screen_modifiers && modifiers == NULL) {
+            count = mod_reply->num_screen_modifiers;
+            modifiers = malloc(count * sizeof(uint64_t));
+            if (!modifiers) {
+               free(modifiers);
+               free(mod_reply);
+               goto no_image;
+            }
+
+            memcpy(modifiers,
+                   xcb_dri3_get_supported_modifiers_screen_modifiers(mod_reply),
+                   count * sizeof(uint64_t));
+         }
+
+         free(mod_reply);
+
+         /* don't use createImageWithModifiers() if we have no
+          * modifiers, other things depend on the use flags when
+          * there are no modifiers to know that a buffer can be
+          * shared.
+          */
+         if (modifiers) {
+            buffer->image = draw->ext->image->createImageWithModifiers(draw->dri_screen,
+                                                                       width, height,
+                                                                       format,
+                                                                       modifiers,
+                                                                       count,
+                                                                       buffer);
+         }
+
+         free(modifiers);
+      }
+#endif
+      if (!buffer->image)
+         buffer->image = draw->ext->image->createImage(draw->dri_screen,
+                                                       width, height,
+                                                       format,
+                                                       __DRI_IMAGE_USE_SHARE |
+                                                       __DRI_IMAGE_USE_SCANOUT |
+                                                       __DRI_IMAGE_USE_BACKBUFFER,
+                                                       buffer);
+
       pixmap_buffer = buffer->image;
 
       if (!buffer->image)
@@ -1050,7 +1368,8 @@ dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int format,
 
       buffer->linear_buffer =
         draw->ext->image->createImage(draw->dri_screen,
-                                      width, height, format,
+                                      width, height,
+                                      dri3_linear_format_for_format(draw, format),
                                       __DRI_IMAGE_USE_SHARE |
                                       __DRI_IMAGE_USE_LINEAR |
                                       __DRI_IMAGE_USE_BACKBUFFER,
@@ -1061,25 +1380,70 @@ dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int format,
          goto no_linear_buffer;
    }
 
-   /* X wants the stride, so ask the image for it
+   /* X want some information about the planes, so ask the image for it
     */
-   if (!draw->ext->image->queryImage(pixmap_buffer, __DRI_IMAGE_ATTRIB_STRIDE,
-                                     &stride))
-      goto no_buffer_attrib;
+   if (!draw->ext->image->queryImage(pixmap_buffer, __DRI_IMAGE_ATTRIB_NUM_PLANES,
+                                     &num_planes))
+      num_planes = 1;
 
-   buffer->pitch = stride;
+   for (i = 0; i < num_planes; i++) {
+      __DRIimage *image = draw->ext->image->fromPlanar(pixmap_buffer, i, NULL);
 
-   if (!draw->ext->image->queryImage(pixmap_buffer, __DRI_IMAGE_ATTRIB_FD,
-                                     &buffer_fd))
-      goto no_buffer_attrib;
+      if (!image) {
+         assert(i == 0);
+         image = pixmap_buffer;
+      }
 
-   xcb_dri3_pixmap_from_buffer(draw->conn,
-                               (pixmap = xcb_generate_id(draw->conn)),
-                               draw->drawable,
-                               buffer->size,
-                               width, height, buffer->pitch,
-                               depth, buffer->cpp * 8,
-                               buffer_fd);
+      ret = draw->ext->image->queryImage(image, __DRI_IMAGE_ATTRIB_FD,
+                                         &buffer_fds[i]);
+      ret &= draw->ext->image->queryImage(image, __DRI_IMAGE_ATTRIB_STRIDE,
+                                          &buffer->strides[i]);
+      ret &= draw->ext->image->queryImage(image, __DRI_IMAGE_ATTRIB_OFFSET,
+                                          &buffer->offsets[i]);
+      if (image != pixmap_buffer)
+         draw->ext->image->destroyImage(image);
+
+      if (!ret)
+         goto no_buffer_attrib;
+   }
+
+   ret = draw->ext->image->queryImage(pixmap_buffer,
+                                     __DRI_IMAGE_ATTRIB_MODIFIER_UPPER, &mod);
+   buffer->modifier = (uint64_t) mod << 32;
+   ret &= draw->ext->image->queryImage(pixmap_buffer,
+                                       __DRI_IMAGE_ATTRIB_MODIFIER_LOWER, &mod);
+   buffer->modifier |= (uint64_t)(mod & 0xffffffff);
+
+   if (!ret)
+      buffer->modifier = DRM_FORMAT_MOD_INVALID;
+
+   pixmap = xcb_generate_id(draw->conn);
+#ifdef HAVE_DRI3_MODIFIERS
+   if (draw->multiplanes_available &&
+       buffer->modifier != DRM_FORMAT_MOD_INVALID) {
+      xcb_dri3_pixmap_from_buffers(draw->conn,
+                                   pixmap,
+                                   draw->window,
+                                   num_planes,
+                                   width, height,
+                                   buffer->strides[0], buffer->offsets[0],
+                                   buffer->strides[1], buffer->offsets[1],
+                                   buffer->strides[2], buffer->offsets[2],
+                                   buffer->strides[3], buffer->offsets[3],
+                                   depth, buffer->cpp * 8,
+                                   buffer->modifier,
+                                   buffer_fds);
+   } else
+#endif
+   {
+      xcb_dri3_pixmap_from_buffer(draw->conn,
+                                  pixmap,
+                                  draw->drawable,
+                                  buffer->size,
+                                  width, height, buffer->strides[0],
+                                  depth, buffer->cpp * 8,
+                                  buffer_fds[0]);
+   }
 
    xcb_dri3_fence_from_fd(draw->conn,
                           pixmap,
@@ -1101,6 +1465,9 @@ dri3_alloc_render_buffer(struct loader_dri3_drawable *draw, unsigned int format,
    return buffer;
 
 no_buffer_attrib:
+   do {
+      close(buffer_fds[i]);
+   } while (--i >= 0);
    draw->ext->image->destroyImage(pixmap_buffer);
 no_linear_buffer:
    if (draw->is_different_gpu)
@@ -1121,9 +1488,9 @@ no_shm_fence:
  * track the geometry of the drawable
  */
 static int
-dri3_update_drawable(__DRIdrawable *driDrawable,
-                     struct loader_dri3_drawable *draw)
+dri3_update_drawable(struct loader_dri3_drawable *draw)
 {
+   mtx_lock(&draw->mtx);
    if (draw->first_init) {
       xcb_get_geometry_cookie_t                 geom_cookie;
       xcb_get_geometry_reply_t                  *geom_reply;
@@ -1131,6 +1498,7 @@ dri3_update_drawable(__DRIdrawable *driDrawable,
       xcb_generic_error_t                       *error;
       xcb_present_query_capabilities_cookie_t   present_capabilities_cookie;
       xcb_present_query_capabilities_reply_t    *present_capabilities_reply;
+      xcb_window_t                               root_win;
 
       draw->first_init = false;
 
@@ -1164,13 +1532,15 @@ dri3_update_drawable(__DRIdrawable *driDrawable,
 
       geom_reply = xcb_get_geometry_reply(draw->conn, geom_cookie, NULL);
 
-      if (!geom_reply)
+      if (!geom_reply) {
+         mtx_unlock(&draw->mtx);
          return false;
-
+      }
       draw->width = geom_reply->width;
       draw->height = geom_reply->height;
       draw->depth = geom_reply->depth;
       draw->vtable->set_drawable_size(draw, draw->width, draw->height);
+      root_win = geom_reply->root;
 
       free(geom_reply);
 
@@ -1197,14 +1567,22 @@ dri3_update_drawable(__DRIdrawable *driDrawable,
       if (error) {
          if (error->error_code != BadWindow) {
             free(error);
+            mtx_unlock(&draw->mtx);
             return false;
          }
+         free(error);
          draw->is_pixmap = true;
          xcb_unregister_for_special_event(draw->conn, draw->special_event);
          draw->special_event = NULL;
       }
+
+      if (draw->is_pixmap)
+         draw->window = root_win;
+      else
+         draw->window = draw->drawable;
    }
    dri3_flush_present_events(draw);
+   mtx_unlock(&draw->mtx);
    return true;
 }
 
@@ -1244,10 +1622,57 @@ loader_dri3_create_image(xcb_connection_t *c,
 
    ret = image->fromPlanar(image_planar, 0, loaderPrivate);
 
-   image->destroyImage(image_planar);
+   if (!ret)
+      ret = image_planar;
+   else
+      image->destroyImage(image_planar);
+
+   return ret;
+}
+
+#ifdef HAVE_DRI3_MODIFIERS
+__DRIimage *
+loader_dri3_create_image_from_buffers(xcb_connection_t *c,
+                                      xcb_dri3_buffers_from_pixmap_reply_t *bp_reply,
+                                      unsigned int format,
+                                      __DRIscreen *dri_screen,
+                                      const __DRIimageExtension *image,
+                                      void *loaderPrivate)
+{
+   __DRIimage                           *ret;
+   int                                  *fds;
+   uint32_t                             *strides_in, *offsets_in;
+   int                                   strides[4], offsets[4];
+   unsigned                              error;
+   int                                   i;
+
+   if (bp_reply->nfd > 4)
+      return NULL;
+
+   fds = xcb_dri3_buffers_from_pixmap_reply_fds(c, bp_reply);
+   strides_in = xcb_dri3_buffers_from_pixmap_strides(bp_reply);
+   offsets_in = xcb_dri3_buffers_from_pixmap_offsets(bp_reply);
+   for (i = 0; i < bp_reply->nfd; i++) {
+      strides[i] = strides_in[i];
+      offsets[i] = offsets_in[i];
+   }
+
+   ret = image->createImageFromDmaBufs2(dri_screen,
+                                        bp_reply->width,
+                                        bp_reply->height,
+                                        image_format_to_fourcc(format),
+                                        bp_reply->modifier,
+                                        fds, bp_reply->nfd,
+                                        strides, offsets,
+                                        0, 0, 0, 0, /* UNDEFINED */
+                                        &error, loaderPrivate);
+
+   for (i = 0; i < bp_reply->nfd; i++)
+      close(fds[i]);
 
    return ret;
 }
+#endif
 
 /** dri3_get_pixmap_buffer
  *
@@ -1262,11 +1687,12 @@ dri3_get_pixmap_buffer(__DRIdrawable *driDrawable, unsigned int format,
    int                                  buf_id = loader_dri3_pixmap_buf_id(buffer_type);
    struct loader_dri3_buffer            *buffer = draw->buffers[buf_id];
    xcb_drawable_t                       pixmap;
-   xcb_dri3_buffer_from_pixmap_cookie_t bp_cookie;
-   xcb_dri3_buffer_from_pixmap_reply_t  *bp_reply;
    xcb_sync_fence_t                     sync_fence;
    struct xshmfence                     *shm_fence;
+   int                                  width;
+   int                                  height;
    int                                  fence_fd;
+   __DRIscreen                          *cur_screen;
 
    if (buffer)
       return buffer;
@@ -1286,38 +1712,73 @@ dri3_get_pixmap_buffer(__DRIdrawable *driDrawable, unsigned int format,
       goto no_fence;
    }
 
+   /* Get the currently-bound screen or revert to using the drawable's screen if
+    * no contexts are currently bound. The latter case is at least necessary for
+    * obs-studio, when using Window Capture (Xcomposite) as a Source.
+    */
+   cur_screen = draw->vtable->get_dri_screen();
+   if (!cur_screen) {
+       cur_screen = draw->dri_screen;
+   }
+
    xcb_dri3_fence_from_fd(draw->conn,
                           pixmap,
                           (sync_fence = xcb_generate_id(draw->conn)),
                           false,
                           fence_fd);
+#ifdef HAVE_DRI3_MODIFIERS
+   if (draw->multiplanes_available &&
+       draw->ext->image->base.version >= 15 &&
+       draw->ext->image->createImageFromDmaBufs2) {
+      xcb_dri3_buffers_from_pixmap_cookie_t bps_cookie;
+      xcb_dri3_buffers_from_pixmap_reply_t *bps_reply;
+
+      bps_cookie = xcb_dri3_buffers_from_pixmap(draw->conn, pixmap);
+      bps_reply = xcb_dri3_buffers_from_pixmap_reply(draw->conn, bps_cookie,
+                                                     NULL);
+      if (!bps_reply)
+         goto no_image;
+      buffer->image =
+         loader_dri3_create_image_from_buffers(draw->conn, bps_reply, format,
+                                               cur_screen, draw->ext->image,
+                                               buffer);
+      width = bps_reply->width;
+      height = bps_reply->height;
+      free(bps_reply);
+   } else
+#endif
+   {
+      xcb_dri3_buffer_from_pixmap_cookie_t bp_cookie;
+      xcb_dri3_buffer_from_pixmap_reply_t *bp_reply;
+
+      bp_cookie = xcb_dri3_buffer_from_pixmap(draw->conn, pixmap);
+      bp_reply = xcb_dri3_buffer_from_pixmap_reply(draw->conn, bp_cookie, NULL);
+      if (!bp_reply)
+         goto no_image;
 
-   bp_cookie = xcb_dri3_buffer_from_pixmap(draw->conn, pixmap);
-   bp_reply = xcb_dri3_buffer_from_pixmap_reply(draw->conn, bp_cookie, NULL);
-   if (!bp_reply)
-      goto no_image;
+      buffer->image = loader_dri3_create_image(draw->conn, bp_reply, format,
+                                               cur_screen, draw->ext->image,
+                                               buffer);
+      width = bp_reply->width;
+      height = bp_reply->height;
+      free(bp_reply);
+   }
 
-   buffer->image = loader_dri3_create_image(draw->conn, bp_reply, format,
-                                            draw->dri_screen, draw->ext->image,
-                                            buffer);
    if (!buffer->image)
       goto no_image;
 
    buffer->pixmap = pixmap;
    buffer->own_pixmap = false;
-   buffer->width = bp_reply->width;
-   buffer->height = bp_reply->height;
+   buffer->width = width;
+   buffer->height = height;
    buffer->shm_fence = shm_fence;
    buffer->sync_fence = sync_fence;
 
    draw->buffers[buf_id] = buffer;
 
-   free(bp_reply);
-
    return buffer;
 
 no_image:
-   free(bp_reply);
    xcb_sync_destroy_fence(draw->conn, sync_fence);
    xshmfence_unmap_shm(shm_fence);
 no_fence:
@@ -1337,6 +1798,7 @@ dri3_get_buffer(__DRIdrawable *driDrawable,
                 struct loader_dri3_drawable *draw)
 {
    struct loader_dri3_buffer *buffer;
+   bool fence_await = buffer_type == loader_dri3_buffer_back;
    int buf_id;
 
    if (buffer_type == loader_dri3_buffer_back) {
@@ -1352,11 +1814,12 @@ dri3_get_buffer(__DRIdrawable *driDrawable,
 
    buffer = draw->buffers[buf_id];
 
-   /* Allocate a new buffer if there isn't an old one, or if that
-    * old one is the wrong size
+   /* Allocate a new buffer if there isn't an old one, if that
+    * old one is the wrong size, or if it's suboptimal
     */
    if (!buffer || buffer->width != draw->width ||
-       buffer->height != draw->height) {
+       buffer->height != draw->height ||
+       buffer->reallocate) {
       struct loader_dri3_buffer *new_buffer;
 
       /* Allocate the new buffers
@@ -1372,30 +1835,32 @@ dri3_get_buffer(__DRIdrawable *driDrawable,
       /* When resizing, copy the contents of the old buffer, waiting for that
        * copy to complete using our fences before proceeding
        */
-      switch (buffer_type) {
-      case loader_dri3_buffer_back:
-         if (buffer) {
-            if (!buffer->linear_buffer) {
-               dri3_fence_reset(draw->conn, new_buffer);
-               dri3_fence_await(draw->conn, draw, buffer);
-               dri3_copy_area(draw->conn,
-                              buffer->pixmap,
-                              new_buffer->pixmap,
-                              dri3_drawable_gc(draw),
-                              0, 0, 0, 0,
-                              draw->width, draw->height);
-               dri3_fence_trigger(draw->conn, new_buffer);
-            } else if (draw->vtable->in_current_context(draw)) {
-               (void) loader_dri3_blit_image(draw,
-                                             new_buffer->image,
-                                             buffer->image,
-                                             0, 0, draw->width, draw->height,
-                                             0, 0, 0);
-            }
-            dri3_free_render_buffer(draw, buffer);
+      if ((buffer_type == loader_dri3_buffer_back ||
+           (buffer_type == loader_dri3_buffer_front && draw->have_fake_front))
+          && buffer) {
+
+         /* Fill the new buffer with data from an old buffer */
+         if (!loader_dri3_blit_image(draw,
+                                     new_buffer->image,
+                                     buffer->image,
+                                     0, 0,
+                                     MIN2(buffer->width, new_buffer->width),
+                                     MIN2(buffer->height, new_buffer->height),
+                                     0, 0, 0) &&
+             !buffer->linear_buffer) {
+            dri3_fence_reset(draw->conn, new_buffer);
+            dri3_copy_area(draw->conn,
+                           buffer->pixmap,
+                           new_buffer->pixmap,
+                           dri3_drawable_gc(draw),
+                           0, 0, 0, 0,
+                           draw->width, draw->height);
+            dri3_fence_trigger(draw->conn, new_buffer);
+            fence_await = true;
          }
-         break;
-      case loader_dri3_buffer_front:
+         dri3_free_render_buffer(draw, buffer);
+      } else if (buffer_type == loader_dri3_buffer_front) {
+         /* Fill the new fake front with data from a real front */
          loader_dri3_swapbuffer_barrier(draw);
          dri3_fence_reset(draw->conn, new_buffer);
          dri3_copy_area(draw->conn,
@@ -1406,21 +1871,22 @@ dri3_get_buffer(__DRIdrawable *driDrawable,
                         draw->width, draw->height);
          dri3_fence_trigger(draw->conn, new_buffer);
 
-         if (new_buffer->linear_buffer &&
-             draw->vtable->in_current_context(draw)) {
+         if (new_buffer->linear_buffer) {
             dri3_fence_await(draw->conn, draw, new_buffer);
             (void) loader_dri3_blit_image(draw,
                                           new_buffer->image,
                                           new_buffer->linear_buffer,
                                           0, 0, draw->width, draw->height,
                                           0, 0, 0);
-         }
-         break;
+         } else
+            fence_await = true;
       }
       buffer = new_buffer;
       draw->buffers[buf_id] = buffer;
    }
-   dri3_fence_await(draw->conn, draw, buffer);
+
+   if (fence_await)
+      dri3_fence_await(draw->conn, draw, buffer);
 
    /*
     * Do we need to preserve the content of a previous buffer?
@@ -1470,10 +1936,12 @@ dri3_free_buffers(__DRIdrawable *driDrawable,
    case loader_dri3_buffer_back:
       first_id = LOADER_DRI3_BACK_ID(0);
       n_id = LOADER_DRI3_MAX_BACK;
+      draw->cur_blit_source = -1;
       break;
    case loader_dri3_buffer_front:
       first_id = LOADER_DRI3_FRONT_ID;
-      n_id = 1;
+      /* Don't free a fake front holding new backbuffer content. */
+      n_id = (draw->cur_blit_source == LOADER_DRI3_FRONT_ID) ? 0 : 1;
    }
 
    for (buf_id = first_id; buf_id < first_id + n_id; buf_id++) {
@@ -1501,6 +1969,7 @@ loader_dri3_get_buffers(__DRIdrawable *driDrawable,
 {
    struct loader_dri3_drawable *draw = loaderPrivate;
    struct loader_dri3_buffer   *front, *back;
+   int buf_id;
 
    buffers->image_mask = 0;
    buffers->front = NULL;
@@ -1509,9 +1978,19 @@ loader_dri3_get_buffers(__DRIdrawable *driDrawable,
    front = NULL;
    back = NULL;
 
-   if (!dri3_update_drawable(driDrawable, draw))
+   if (!dri3_update_drawable(draw))
       return false;
 
+   dri3_update_num_back(draw);
+
+   /* Free no longer needed back buffers */
+   for (buf_id = draw->num_back; buf_id < LOADER_DRI3_MAX_BACK; buf_id++) {
+      if (draw->cur_blit_source != buf_id && draw->buffers[buf_id]) {
+         dri3_free_render_buffer(draw, draw->buffers[buf_id]);
+         draw->buffers[buf_id] = NULL;
+      }
+   }
+
    /* pixmaps always have front buffers.
     * Exchange swaps also mandate fake front buffers.
     */
@@ -1592,6 +2071,7 @@ loader_dri3_update_drawable_geometry(struct loader_dri3_drawable *draw)
       draw->width = geom_reply->width;
       draw->height = geom_reply->height;
       draw->vtable->set_drawable_size(draw, draw->width, draw->height);
+      draw->ext->flush->invalidate(draw->dri_drawable);
 
       free(geom_reply);
    }
@@ -1639,6 +2119,7 @@ loader_dri3_close_screen(__DRIscreen *dri_screen)
  * Find a potentially new back buffer, and if it's not been allocated yet and
  * in addition needs initializing, then try to allocate and initialize it.
  */
+#include <stdio.h>
 static struct loader_dri3_buffer *
 dri3_find_back_alloc(struct loader_dri3_drawable *draw)
 {
@@ -1646,16 +2127,36 @@ dri3_find_back_alloc(struct loader_dri3_drawable *draw)
    int id;
 
    id = dri3_find_back(draw);
-   back = (id >= 0) ? draw->buffers[id] : NULL;
-
-   if (back || (id >= 0 && draw->back_format != __DRI_IMAGE_FORMAT_NONE)) {
-      if (dri3_update_drawable(draw->dri_drawable, draw)) {
-         (void) dri3_get_buffer(draw->dri_drawable,
-                                draw->back_format,
-                                loader_dri3_buffer_back,
-                                draw);
-         back = (id >= 0) ? draw->buffers[id] : NULL;
-      }
+   if (id < 0)
+      return NULL;
+
+   back = draw->buffers[id];
+   /* Allocate a new back if we haven't got one */
+   if (!back && draw->back_format != __DRI_IMAGE_FORMAT_NONE &&
+       dri3_update_drawable(draw))
+      back = dri3_alloc_render_buffer(draw, draw->back_format,
+                                      draw->width, draw->height, draw->depth);
+
+   if (!back)
+      return NULL;
+
+   draw->buffers[id] = back;
+
+   /* If necessary, prefill the back with data according to swap_method mode. */
+   if (draw->cur_blit_source != -1 &&
+       draw->buffers[draw->cur_blit_source] &&
+       back != draw->buffers[draw->cur_blit_source]) {
+      struct loader_dri3_buffer *source = draw->buffers[draw->cur_blit_source];
+
+      dri3_fence_await(draw->conn, draw, source);
+      dri3_fence_await(draw->conn, draw, back);
+      (void) loader_dri3_blit_image(draw,
+                                    back->image,
+                                    source->image,
+                                    0, 0, draw->width, draw->height,
+                                    0, 0, 0);
+      back->last_swap = source->last_swap;
+      draw->cur_blit_source = -1;
    }
 
    return back;