anv: add VK_KHR_push_descriptor support

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/anv_cmd_buffer.c

@@ -197,6 +197,9 @@ static VkResult anv_create_cmd_buffer(
    anv_state_stream_init(&cmd_buffer->dynamic_state_stream,
                          &device->dynamic_state_block_pool);
 
+   memset(&cmd_buffer->state.push_descriptor, 0,
+          sizeof(cmd_buffer->state.push_descriptor));
+
    if (pool) {
       list_addtail(&cmd_buffer->pool_link, &pool->cmd_buffers);
    } else {
@@ -816,3 +819,91 @@ anv_cmd_buffer_get_depth_stencil_view(const struct anv_cmd_buffer *cmd_buffer)
 
    return iview;
 }
+
+void anv_CmdPushDescriptorSetKHR(
+    VkCommandBuffer commandBuffer,
+    VkPipelineBindPoint pipelineBindPoint,
+    VkPipelineLayout _layout,
+    uint32_t _set,
+    uint32_t descriptorWriteCount,
+    const VkWriteDescriptorSet* pDescriptorWrites)
+{
+   ANV_FROM_HANDLE(anv_cmd_buffer, cmd_buffer, commandBuffer);
+   ANV_FROM_HANDLE(anv_pipeline_layout, layout, _layout);
+
+   assert(pipelineBindPoint == VK_PIPELINE_BIND_POINT_GRAPHICS ||
+          pipelineBindPoint == VK_PIPELINE_BIND_POINT_COMPUTE);
+   assert(_set < MAX_SETS);
+
+   const struct anv_descriptor_set_layout *set_layout =
+      layout->set[_set].layout;
+   struct anv_descriptor_set *set = &cmd_buffer->state.push_descriptor.set;
+
+   set->layout = set_layout;
+   set->size = anv_descriptor_set_layout_size(set_layout);
+   set->buffer_count = set_layout->buffer_count;
+   set->buffer_views = cmd_buffer->state.push_descriptor.buffer_views;
+
+   /* Go through the user supplied descriptors. */
+   for (uint32_t i = 0; i < descriptorWriteCount; i++) {
+      const VkWriteDescriptorSet *write = &pDescriptorWrites[i];
+
+      switch (write->descriptorType) {
+      case VK_DESCRIPTOR_TYPE_SAMPLER:
+      case VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER:
+      case VK_DESCRIPTOR_TYPE_SAMPLED_IMAGE:
+      case VK_DESCRIPTOR_TYPE_STORAGE_IMAGE:
+      case VK_DESCRIPTOR_TYPE_INPUT_ATTACHMENT:
+         for (uint32_t j = 0; j < write->descriptorCount; j++) {
+            anv_descriptor_set_write_image_view(set,
+                                                write->descriptorType,
+                                                write->pImageInfo[j].imageView,
+                                                write->pImageInfo[j].sampler,
+                                                write->dstBinding,
+                                                write->dstArrayElement + j);
+         }
+         break;
+
+      case VK_DESCRIPTOR_TYPE_UNIFORM_TEXEL_BUFFER:
+      case VK_DESCRIPTOR_TYPE_STORAGE_TEXEL_BUFFER:
+         for (uint32_t j = 0; j < write->descriptorCount; j++) {
+            ANV_FROM_HANDLE(anv_buffer_view, bview,
+                            write->pTexelBufferView[j]);
+
+            anv_descriptor_set_write_buffer_view(set,
+                                                 write->descriptorType,
+                                                 bview,
+                                                 write->dstBinding,
+                                                 write->dstArrayElement + j);
+         }
+         break;
+
+      case VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER:
+      case VK_DESCRIPTOR_TYPE_STORAGE_BUFFER:
+      case VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER_DYNAMIC:
+      case VK_DESCRIPTOR_TYPE_STORAGE_BUFFER_DYNAMIC:
+         for (uint32_t j = 0; j < write->descriptorCount; j++) {
+            assert(write->pBufferInfo[j].buffer);
+            ANV_FROM_HANDLE(anv_buffer, buffer, write->pBufferInfo[j].buffer);
+            assert(buffer);
+
+            anv_descriptor_set_write_buffer(set,
+                                            cmd_buffer->device,
+                                            &cmd_buffer->surface_state_stream,
+                                            write->descriptorType,
+                                            buffer,
+                                            write->dstBinding,
+                                            write->dstArrayElement + j,
+                                            write->pBufferInfo[j].offset,
+                                            write->pBufferInfo[j].range);
+         }
+         break;
+
+      default:
+         break;
+      }
+   }
+
+   cmd_buffer->state.descriptors[_set] = set;
+   cmd_buffer->state.descriptors_dirty |= set_layout->shader_stages;
+}

src/intel/vulkan/anv_device.c

@@ -261,6 +261,10 @@ static const VkExtensionProperties device_extensions[] = {
    {
       .extensionName = VK_KHR_SHADER_DRAW_PARAMETERS_EXTENSION_NAME,
       .specVersion = 1,
+   },
+   {
+      .extensionName = VK_KHR_PUSH_DESCRIPTOR_EXTENSION_NAME,
+      .specVersion = 1,
    }
 };
 
@@ -502,6 +506,14 @@ void anv_GetPhysicalDeviceFeatures2KHR(
 
    vk_foreach_struct(ext, pFeatures->pNext) {
       switch (ext->sType) {
+      case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_PUSH_DESCRIPTOR_PROPERTIES_KHR: {
+         VkPhysicalDevicePushDescriptorPropertiesKHR *properties =
+            (VkPhysicalDevicePushDescriptorPropertiesKHR *) ext;
+
+         properties->maxPushDescriptors = MAX_PUSH_DESCRIPTORS;
+         break;
+      }
+
       default:
          anv_debug_ignored_stype(ext->sType);
          break;

src/intel/vulkan/anv_entrypoints_gen.py

@@ -30,6 +30,7 @@ max_api_version = 1.0
 supported_extensions = [
    'VK_KHR_get_physical_device_properties2',
    'VK_KHR_maintenance1',
+   'VK_KHR_push_descriptor',
    'VK_KHR_sampler_mirror_clamp_to_edge',
    'VK_KHR_shader_draw_parameters',
    'VK_KHR_surface',

src/intel/vulkan/anv_private.h

@@ -95,6 +95,7 @@ struct gen_l3_config;
 #define MAX_PUSH_CONSTANTS_SIZE 128
 #define MAX_DYNAMIC_BUFFERS 16
 #define MAX_IMAGES 8
+#define MAX_PUSH_DESCRIPTORS 32 /* Minimum requirement */
 
 #define ANV_SVGS_VB_INDEX    MAX_VBS
 #define ANV_DRAWID_VB_INDEX (MAX_VBS + 1)
@@ -928,6 +929,16 @@ struct anv_buffer_view {
    struct brw_image_param storage_image_param;
 };
 
+struct anv_push_descriptor_set {
+   struct anv_descriptor_set set;
+
+   /* Put this field right behind anv_descriptor_set so it fills up the
+    * descriptors[0] field. */
+   struct anv_descriptor descriptors[MAX_PUSH_DESCRIPTORS];
+
+   struct anv_buffer_view buffer_views[MAX_PUSH_DESCRIPTORS];
+};
+
 struct anv_descriptor_pool {
    uint32_t size;
    uint32_t next;
@@ -1211,6 +1222,8 @@ struct anv_cmd_state {
    struct anv_dynamic_state                     dynamic;
    bool                                         need_query_wa;
 
+   struct anv_push_descriptor_set               push_descriptor;
+
    /**
     * Whether or not the gen8 PMA fix is enabled.  We ensure that, at the top
     * of any command buffer it is disabled by disabling it in EndCommandBuffer