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// Copyright 2018 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef DAWNNATIVE_VULKAN_BINDGROUPLAYOUTVK_H_
#define DAWNNATIVE_VULKAN_BINDGROUPLAYOUTVK_H_
#include "dawn_native/BindGroupLayout.h"
#include "common/vulkan_platform.h"
#include <vector>
namespace dawn_native { namespace vulkan {
class Device;
VkDescriptorType VulkanDescriptorType(wgpu::BindingType type, bool isDynamic);
// Contains a descriptor set along with data necessary to track its allocation.
struct DescriptorSetAllocation {
size_t index = 0;
VkDescriptorSet set = VK_NULL_HANDLE;
};
// In Vulkan descriptor pools have to be sized to an exact number of descriptors. This means
// it's hard to have something where we can mix different types of descriptor sets because
// we don't know if their vector of number of descriptors will be similar.
//
// That's why that in addition to containing the VkDescriptorSetLayout to create
// VkDescriptorSets for its bindgroups, the layout also acts as an allocator for the descriptor
// sets.
//
// The allocations is done with one pool per descriptor set, which is inefficient, but at least
// the pools are reused when no longer used. Minimizing the number of descriptor pool allocation
// is important because creating them can incur GPU memory allocation which is usually an
// expensive syscall.
class BindGroupLayout : public BindGroupLayoutBase {
public:
static ResultOrError<BindGroupLayout*> Create(Device* device,
const BindGroupLayoutDescriptor* descriptor);
~BindGroupLayout();
VkDescriptorSetLayout GetHandle() const;
ResultOrError<DescriptorSetAllocation> AllocateOneSet();
void Deallocate(DescriptorSetAllocation* allocation);
// Interaction with the DescriptorSetService.
void FinishDeallocation(size_t index);
private:
using BindGroupLayoutBase::BindGroupLayoutBase;
MaybeError Initialize();
std::vector<VkDescriptorPoolSize> mPoolSizes;
struct SingleDescriptorSetAllocation {
VkDescriptorPool pool = VK_NULL_HANDLE;
// Descriptor sets are freed when the pool is destroyed.
VkDescriptorSet set = VK_NULL_HANDLE;
};
std::vector<SingleDescriptorSetAllocation> mAllocations;
std::vector<size_t> mAvailableAllocations;
VkDescriptorSetLayout mHandle = VK_NULL_HANDLE;
};
}} // namespace dawn_native::vulkan
#endif // DAWNNATIVE_VULKAN_BINDGROUPLAYOUTVK_H_