[Mesa-dev] [PATCH v5 11/19] i965/miptree: Add new clear color BO for winsys aux buffers

[Rafael Antognolli]

Add an extra BO to store clear color when we receive the aux buffer from
the window system. Since we have no control over the aux buffer size in
this case, we need the new BO to store only the clear color.

v5:
 - Better subject (Jordan).
 - Drop alignment from brw_bo_alloc().

Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>
---
 src/mesa/drivers/dri/i965/intel_mipmap_tree.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index d11ae65243f..89074a64930 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -969,6 +969,23 @@ create_ccs_buf_for_image(struct brw_context *brw,
       return false;
    }
 
+   /* On gen10+ we start using an extra space in the aux buffer to store the
+    * indirect clear color. However, if we imported an image from the window
+    * system with CCS, we don't have the extra space at the end of the aux
+    * buffer. So create a new bo here that will store that clear color.
+    */
+   const struct gen_device_info *devinfo = &brw->screen->devinfo;
+   if (devinfo->gen >= 10) {
+      mt->mcs_buf->clear_color_bo =
+         brw_bo_alloc(brw->bufmgr, "clear_color_bo",
+                      brw->isl_dev.ss.clear_color_state_size);
+      if (!mt->mcs_buf->clear_color_bo) {
+         free(mt->mcs_buf);
+         mt->mcs_buf = NULL;
+         return false;
+      }
+   }
+
    mt->mcs_buf->bo = image->bo;
    brw_bo_reference(image->bo);
 
-- 
2.14.3