Mesa (master): anv/image: Create an additional surface state for sampling

[Nanley Chery]

Module: Mesa
Branch: master
Commit: efc2222323b662ca20a23044a5d4b79157152fe5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=efc2222323b662ca20a23044a5d4b79157152fe5

Author: Nanley Chery <nanley.g.chery at intel.com>
Date:   Tue Jan 31 11:04:42 2017 -0800

anv/image: Create an additional surface state for sampling

This will be used to sample a depth input attachment without having to
pass through the HiZ buffer.

Signed-off-by: Nanley Chery <nanley.g.chery at intel.com>
Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

---

 src/intel/vulkan/anv_image.c   | 22 +++++++++++++++++++++-
 src/intel/vulkan/anv_private.h |  6 ++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/intel/vulkan/anv_image.c b/src/intel/vulkan/anv_image.c
index 16a6083..95ba12c 100644
--- a/src/intel/vulkan/anv_image.c
+++ b/src/intel/vulkan/anv_image.c
@@ -692,8 +692,19 @@ anv_CreateImageView(VkDevice _device,
        (image->usage & VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT &&
         !(iview->aspect_mask & VK_IMAGE_ASPECT_COLOR_BIT))) {
       iview->sampler_surface_state = alloc_surface_state(device);
+      iview->no_aux_sampler_surface_state = alloc_surface_state(device);
 
-      /* Select the optimal aux_usage for sampling. */
+      /* Sampling is performed in one of two buffer configurations in anv: with
+       * an auxiliary buffer or without it. Sampler states aren't always needed
+       * for both configurations, but are currently created unconditionally for
+       * simplicity.
+       *
+       * TODO: Consider allocating each surface state only when necessary.
+       */
+
+      /* Create a sampler state with the optimal aux_usage for sampling. This
+       * may use the aux_buffer.
+       */
       const enum isl_aux_usage surf_usage =
          anv_layout_to_aux_usage(&device->info, image, iview->aspect_mask,
                                  VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL);
@@ -716,9 +727,18 @@ anv_CreateImageView(VkDevice _device,
                           .aux_usage = surf_usage,
                           .mocs = device->default_mocs);
 
+      /* Create a sampler state that only uses the main buffer. */
+      isl_surf_fill_state(&device->isl_dev,
+                          iview->no_aux_sampler_surface_state.map,
+                          .surf = &surface->isl,
+                          .view = &view,
+                          .mocs = device->default_mocs);
+
       anv_state_flush(device, iview->sampler_surface_state);
+      anv_state_flush(device, iview->no_aux_sampler_surface_state);
    } else {
       iview->sampler_surface_state.alloc_size = 0;
+      iview->no_aux_sampler_surface_state.alloc_size = 0;
    }
 
    /* NOTE: This one needs to go last since it may stomp isl_view.format */
diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 49ca510..b12012d 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -1819,6 +1819,12 @@ struct anv_image_view {
    struct anv_state sampler_surface_state;
 
    /**
+    * RENDER_SURFACE_STATE when using image as a sampler surface with the
+    * auxiliary buffer disabled.
+    */
+   struct anv_state no_aux_sampler_surface_state;
+
+   /**
     * RENDER_SURFACE_STATE when using image as a storage image. Separate states
     * for write-only and readable, using the real format for write-only and the
     * lowered format for readable.