anv: Make subpass::depth_stencil_attachment a pointer

This makes certain checks a bit easier and means that we don't have
the attachment information duplicated in the attachment list and in
depth_stencil_attachment.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/intel/vulkan/anv_blorp.c

@@ -1060,7 +1060,7 @@ clear_depth_stencil_attachment(struct anv_cmd_buffer *cmd_buffer,
 {
    static const union isl_color_value color_value = { .u32 = { 0, } };
    const struct anv_subpass *subpass = cmd_buffer->state.subpass;
-   const uint32_t att_idx = subpass->depth_stencil_attachment.attachment;
+   const uint32_t att_idx = subpass->depth_stencil_attachment->attachment;
 
    if (att_idx == VK_ATTACHMENT_UNUSED)
       return;

src/intel/vulkan/anv_cmd_buffer.c

@@ -916,11 +916,11 @@ anv_cmd_buffer_get_depth_stencil_view(const struct anv_cmd_buffer *cmd_buffer)
    const struct anv_subpass *subpass = cmd_buffer->state.subpass;
    const struct anv_framebuffer *fb = cmd_buffer->state.framebuffer;
 
-   if (subpass->depth_stencil_attachment.attachment == VK_ATTACHMENT_UNUSED)
+   if (subpass->depth_stencil_attachment == NULL)
       return NULL;
 
    const struct anv_image_view *iview =
-      fb->attachments[subpass->depth_stencil_attachment.attachment];
+      fb->attachments[subpass->depth_stencil_attachment->attachment];
 
    assert(iview->aspect_mask & (VK_IMAGE_ASPECT_DEPTH_BIT |
                                 VK_IMAGE_ASPECT_STENCIL_BIT));

src/intel/vulkan/anv_pass.c

@@ -66,6 +66,14 @@ anv_render_pass_compile(struct anv_render_pass *pass)
    for (uint32_t i = 0; i < pass->subpass_count; i++) {
       struct anv_subpass *subpass = &pass->subpasses[i];
 
+      /* We don't allow depth_stencil_attachment to be non-NULL and be
+       * VK_ATTACHMENT_UNUSED.  This way something can just check for NULL
+       * and be guaranteed that they have a valid attachment.
+       */
+      if (subpass->depth_stencil_attachment &&
+          subpass->depth_stencil_attachment->attachment == VK_ATTACHMENT_UNUSED)
+         subpass->depth_stencil_attachment = NULL;
+
       for (uint32_t j = 0; j < subpass->attachment_count; j++) {
          struct anv_subpass_attachment *subpass_att = &subpass->attachments[j];
          if (subpass_att->attachment == VK_ATTACHMENT_UNUSED)
@@ -86,7 +94,8 @@ anv_render_pass_compile(struct anv_render_pass *pass)
          }
 
          if (subpass_att->usage == VK_IMAGE_USAGE_INPUT_ATTACHMENT_BIT &&
-             subpass_att->attachment == subpass->depth_stencil_attachment.attachment)
+             subpass->depth_stencil_attachment &&
+             subpass_att->attachment == subpass->depth_stencil_attachment->attachment)
             subpass->has_ds_self_dep = true;
       }
 
@@ -283,18 +292,13 @@ VkResult anv_CreateRenderPass(
       }
 
       if (desc->pDepthStencilAttachment) {
-         subpass->depth_stencil_attachment = (struct anv_subpass_attachment) {
+         subpass->depth_stencil_attachment = subpass_attachments++;
+
+         *subpass->depth_stencil_attachment = (struct anv_subpass_attachment) {
             .usage =       VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT,
             .attachment =  desc->pDepthStencilAttachment->attachment,
             .layout =      desc->pDepthStencilAttachment->layout,
          };
-         *subpass_attachments++ = subpass->depth_stencil_attachment;
-      } else {
-         subpass->depth_stencil_attachment = (struct anv_subpass_attachment) {
-            .usage =       VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT,
-            .attachment =  VK_ATTACHMENT_UNUSED,
-            .layout =   VK_IMAGE_LAYOUT_UNDEFINED,
-         };
       }
    }
 
@@ -357,8 +361,7 @@ void anv_GetRenderAreaGranularity(
     * for all sample counts.
     */
    for (unsigned i = 0; i < pass->subpass_count; ++i) {
-      if (pass->subpasses[i].depth_stencil_attachment.attachment !=
+      if (pass->subpasses[i].depth_stencil_attachment) {
-          VK_ATTACHMENT_UNUSED) {
          *pGranularity = (VkExtent2D) { .width = 8, .height = 4 };
          return;
       }

src/intel/vulkan/anv_pipeline.c

@@ -1173,7 +1173,7 @@ copy_non_dynamic_state(struct anv_pipeline *pipeline,
     *    against does not use a depth/stencil attachment.
     */
    if (!pCreateInfo->pRasterizationState->rasterizerDiscardEnable &&
-       subpass->depth_stencil_attachment.attachment != VK_ATTACHMENT_UNUSED) {
+       subpass->depth_stencil_attachment) {
       assert(pCreateInfo->pDepthStencilState);
 
       if (states & (1 << VK_DYNAMIC_STATE_DEPTH_BOUNDS)) {
@@ -1234,7 +1234,7 @@ anv_pipeline_validate_create_info(const VkGraphicsPipelineCreateInfo *info)
       assert(info->pViewportState);
       assert(info->pMultisampleState);
 
-      if (subpass && subpass->depth_stencil_attachment.attachment != VK_ATTACHMENT_UNUSED)
+      if (subpass && subpass->depth_stencil_attachment)
          assert(info->pDepthStencilState);
 
       if (subpass && subpass->color_count > 0) {

src/intel/vulkan/anv_private.h

@@ -3146,7 +3146,7 @@ struct anv_subpass {
    struct anv_subpass_attachment *              color_attachments;
    struct anv_subpass_attachment *              resolve_attachments;
 
-   struct anv_subpass_attachment                depth_stencil_attachment;
+   struct anv_subpass_attachment *              depth_stencil_attachment;
 
    uint32_t                                     view_mask;
 

src/intel/vulkan/gen7_cmd_buffer.c

@@ -127,11 +127,11 @@ get_depth_format(struct anv_cmd_buffer *cmd_buffer)
    const struct anv_render_pass *pass = cmd_buffer->state.pass;
    const struct anv_subpass *subpass = cmd_buffer->state.subpass;
 
-   if (subpass->depth_stencil_attachment.attachment >= pass->attachment_count)
+   if (!subpass->depth_stencil_attachment)
       return D16_UNORM;
 
    struct anv_render_pass_attachment *att =
-      &pass->attachments[subpass->depth_stencil_attachment.attachment];
+      &pass->attachments[subpass->depth_stencil_attachment->attachment];
 
    switch (att->format) {
    case VK_FORMAT_D16_UNORM:

src/intel/vulkan/genX_cmd_buffer.c

@@ -1372,7 +1372,7 @@ genX(BeginCommandBuffer)(
 
          if (iview) {
             VkImageLayout layout =
-                cmd_buffer->state.subpass->depth_stencil_attachment.layout;
+                cmd_buffer->state.subpass->depth_stencil_attachment->layout;
 
             enum isl_aux_usage aux_usage =
                anv_layout_to_aux_usage(&cmd_buffer->device->info, iview->image,
@@ -3417,7 +3417,7 @@ cmd_buffer_emit_depth_stencil(struct anv_cmd_buffer *cmd_buffer)
                               surface->offset);
 
       const uint32_t ds =
-         cmd_buffer->state.subpass->depth_stencil_attachment.attachment;
+         cmd_buffer->state.subpass->depth_stencil_attachment->attachment;
       info.hiz_usage = cmd_buffer->state.attachments[ds].aux_usage;
       if (info.hiz_usage == ISL_AUX_USAGE_HIZ) {
          info.hiz_surf = &image->planes[depth_plane].aux_surface.isl;

src/intel/vulkan/genX_pipeline.c

@@ -499,9 +499,9 @@ emit_rs_state(struct anv_pipeline *pipeline,
    /* Gen7 requires that we provide the depth format in 3DSTATE_SF so that it
     * can get the depth offsets correct.
     */
-   if (subpass->depth_stencil_attachment.attachment < pass->attachment_count) {
+   if (subpass->depth_stencil_attachment) {
       VkFormat vk_format =
-         pass->attachments[subpass->depth_stencil_attachment.attachment].format;
+         pass->attachments[subpass->depth_stencil_attachment->attachment].format;
       assert(vk_format_is_depth_or_stencil(vk_format));
       if (vk_format_aspects(vk_format) & VK_IMAGE_ASPECT_DEPTH_BIT) {
          enum isl_format isl_format =
@@ -816,9 +816,9 @@ emit_ds_state(struct anv_pipeline *pipeline,
    }
 
    VkImageAspectFlags ds_aspects = 0;
-   if (subpass->depth_stencil_attachment.attachment != VK_ATTACHMENT_UNUSED) {
+   if (subpass->depth_stencil_attachment) {
       VkFormat depth_stencil_format =
-         pass->attachments[subpass->depth_stencil_attachment.attachment].format;
+         pass->attachments[subpass->depth_stencil_attachment->attachment].format;
       ds_aspects = vk_format_aspects(depth_stencil_format);
    }