nvk: some boilerplate for descriptor sets

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24326>

src/nouveau/vulkan/nvk_descriptor_set.c

@@ -165,10 +165,21 @@ VKAPI_ATTR void VKAPI_CALL nvk_UpdateDescriptorSets(
    }
 }
 
+static void
+nvk_descriptor_set_destroy(struct nvk_device *device, struct nvk_descriptor_pool *pool,
+                           struct nvk_descriptor_set *set, bool free_bo)
+{
+   vk_object_base_finish(&set->base);
+   vk_free2(&device->vk.alloc, NULL, set);
+}
+
 static void
 nvk_destroy_descriptor_pool(struct nvk_device *device, const VkAllocationCallbacks *pAllocator,
                             struct nvk_descriptor_pool *pool)
 {
+   for (int i = 0; i < pool->entry_count; ++i) {
+      nvk_descriptor_set_destroy(device, pool, pool->entries[i].set, false);
+   }
    vk_object_base_finish(&pool->base);
    vk_free2(&device->vk.alloc, pAllocator, pool);
 }
@@ -187,10 +198,78 @@ nvk_CreateDescriptorPool(VkDevice _device,
    if (!pool)
       return vk_error(device, VK_ERROR_OUT_OF_HOST_MEMORY);
    vk_object_base_init(&device->vk, &pool->base, VK_OBJECT_TYPE_DESCRIPTOR_POOL);
+
+   pool->max_entry_count = pCreateInfo->maxSets;
+
    *pDescriptorPool = nvk_descriptor_pool_to_handle(pool);
    return VK_SUCCESS;
 }
 
+static VkResult
+nvk_descriptor_set_create(struct nvk_device *device, struct nvk_descriptor_pool *pool,
+                          struct nvk_descriptor_set_layout *layout, const uint32_t *variable_count,
+                          struct nvk_descriptor_set **out_set)
+{
+   struct nvk_descriptor_set *set;
+   uint32_t mem_size = sizeof(struct nvk_descriptor_set);
+   set = vk_zalloc2(&device->vk.alloc, NULL, mem_size, 8, VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+   if (!set)
+      return vk_error(device, VK_ERROR_OUT_OF_HOST_MEMORY);
+
+   vk_object_base_init(&device->vk, &set->base, VK_OBJECT_TYPE_DESCRIPTOR_SET);
+
+   *out_set = set;
+   return VK_SUCCESS;
+}
+
+VKAPI_ATTR VkResult VKAPI_CALL
+nvk_AllocateDescriptorSets(VkDevice _device,
+                           const VkDescriptorSetAllocateInfo *pAllocateInfo,
+                           VkDescriptorSet *pDescriptorSets)
+{
+   VK_FROM_HANDLE(nvk_device, device, _device);
+   VK_FROM_HANDLE(nvk_descriptor_pool, pool, pAllocateInfo->descriptorPool);
+
+   VkResult result = VK_SUCCESS;
+   uint32_t i;
+
+   struct nvk_descriptor_set *set = NULL;
+
+   /* allocate a set of buffers for each shader to contain descriptors */
+   for (i = 0; i < pAllocateInfo->descriptorSetCount; i++) {
+      VK_FROM_HANDLE(nvk_descriptor_set_layout, layout, pAllocateInfo->pSetLayouts[i]);
+      const uint32_t *variable_count = NULL;
+      result = nvk_descriptor_set_create(device, pool, layout, variable_count, &set);
+      if (result != VK_SUCCESS)
+         break;
+
+      pDescriptorSets[i] = nvk_descriptor_set_to_handle(set);
+   }
+
+   if (result != VK_SUCCESS) {
+      nvk_FreeDescriptorSets(_device, pAllocateInfo->descriptorPool, i, pDescriptorSets);
+            for (i = 0; i < pAllocateInfo->descriptorSetCount; i++) {
+         pDescriptorSets[i] = VK_NULL_HANDLE;
+      }
+   }
+   return result;
+}
+
+VKAPI_ATTR VkResult VKAPI_CALL
+nvk_FreeDescriptorSets(VkDevice _device, VkDescriptorPool descriptorPool, uint32_t count,
+                       const VkDescriptorSet *pDescriptorSets)
+{
+   VK_FROM_HANDLE(nvk_device, device, _device);
+   VK_FROM_HANDLE(nvk_descriptor_pool, pool, descriptorPool);
+
+   for (uint32_t i = 0; i < count; i++) {
+      VK_FROM_HANDLE(nvk_descriptor_set, set, pDescriptorSets[i]);
+
+      if (set)
+         nvk_descriptor_set_destroy(device, pool, set, true);
+   }
+   return VK_SUCCESS;
+}
 
 VKAPI_ATTR void VKAPI_CALL
 nvk_DestroyDescriptorPool(VkDevice _device, VkDescriptorPool _pool,
@@ -201,3 +280,18 @@ nvk_DestroyDescriptorPool(VkDevice _device, VkDescriptorPool _pool,
 
    nvk_destroy_descriptor_pool(device, pAllocator, pool);
 }
+
+VKAPI_ATTR VkResult VKAPI_CALL
+nvk_ResetDescriptorPool(VkDevice _device, VkDescriptorPool descriptorPool,
+                         VkDescriptorPoolResetFlags flags)
+{
+   VK_FROM_HANDLE(nvk_device, device, _device);
+   VK_FROM_HANDLE(nvk_descriptor_pool, pool, descriptorPool);
+
+   for (int i = 0; i < pool->entry_count; ++i) {
+      nvk_descriptor_set_destroy(device, pool, pool->entries[i].set, false);
+   }
+   pool->entry_count = 0;
+
+   return VK_SUCCESS;
+}

src/nouveau/vulkan/nvk_descriptor_set.h

@@ -27,8 +27,15 @@ struct nvk_descriptor_set {
    void *map;
 };
 
+struct nvk_descriptor_pool_entry {
+   struct nvk_descriptor_set *set;
+};
+
 struct nvk_descriptor_pool {
    struct vk_object_base base;
+   uint32_t entry_count;
+   uint32_t max_entry_count;
+   struct nvk_descriptor_pool_entry entries[0];
 };
 
 VK_DEFINE_NONDISP_HANDLE_CASTS(nvk_descriptor_pool, base, VkDescriptorPool,