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Add Descriptor Sets to Filament (#8165)
We add the concept of the descriptor set as a way to describe shader resources into Filament. This is a comprehensive change across Filament. Info on descriptor sets is available here: https://docs.vulkan.org/spec/latest/chapters/descriptorsets.html Co-authored-by: Benjamin Doherty <[email protected]> Co-authored-by: Mathias Agopian <[email protected]> Co-authored-by: Sungun Park <[email protected]>
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101
filament/backend/include/backend/DescriptorSetOffsetArray.h
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| /* | ||
| * Copyright (C) 2024 The Android Open Source Project | ||
| * | ||
| * 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. | ||
| */ | ||
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| #ifndef TNT_FILAMENT_BACKEND_COMMANDSTREAMVECTOR_H | ||
| #define TNT_FILAMENT_BACKEND_COMMANDSTREAMVECTOR_H | ||
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| #include <backend/DriverApiForward.h> | ||
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| #include <initializer_list> | ||
| #include <memory> | ||
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| #include <stddef.h> | ||
| #include <stdint.h> | ||
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| namespace filament::backend { | ||
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| void* allocateFromCommandStream(DriverApi& driver, size_t size, size_t alignment) noexcept; | ||
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| class DescriptorSetOffsetArray { | ||
| public: | ||
| using value_type = uint32_t; | ||
| using reference = value_type&; | ||
| using const_reference = value_type const&; | ||
| using size_type = uint32_t; | ||
| using difference_type = int32_t; | ||
| using pointer = value_type*; | ||
| using const_pointer = value_type const*; | ||
| using iterator = pointer; | ||
| using const_iterator = const_pointer; | ||
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| DescriptorSetOffsetArray() noexcept = default; | ||
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| ~DescriptorSetOffsetArray() noexcept = default; | ||
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| DescriptorSetOffsetArray(size_type size, DriverApi& driver) noexcept { | ||
| mOffsets = (value_type *)allocateFromCommandStream(driver, | ||
| size * sizeof(value_type), alignof(value_type)); | ||
| std::uninitialized_fill_n(mOffsets, size, 0); | ||
| } | ||
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| DescriptorSetOffsetArray(std::initializer_list<uint32_t> list, DriverApi& driver) noexcept { | ||
| mOffsets = (value_type *)allocateFromCommandStream(driver, | ||
| list.size() * sizeof(value_type), alignof(value_type)); | ||
| std::uninitialized_copy(list.begin(), list.end(), mOffsets); | ||
| } | ||
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| DescriptorSetOffsetArray(DescriptorSetOffsetArray const&) = delete; | ||
| DescriptorSetOffsetArray& operator=(DescriptorSetOffsetArray const&) = delete; | ||
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| DescriptorSetOffsetArray(DescriptorSetOffsetArray&& rhs) noexcept | ||
| : mOffsets(rhs.mOffsets) { | ||
| rhs.mOffsets = nullptr; | ||
| } | ||
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| DescriptorSetOffsetArray& operator=(DescriptorSetOffsetArray&& rhs) noexcept { | ||
| if (this != &rhs) { | ||
| mOffsets = rhs.mOffsets; | ||
| rhs.mOffsets = nullptr; | ||
| } | ||
| return *this; | ||
| } | ||
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| bool empty() const noexcept { return mOffsets == nullptr; } | ||
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| value_type* data() noexcept { return mOffsets; } | ||
| const value_type* data() const noexcept { return mOffsets; } | ||
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| reference operator[](size_type n) noexcept { | ||
| return *(data() + n); | ||
| } | ||
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| const_reference operator[](size_type n) const noexcept { | ||
| return *(data() + n); | ||
| } | ||
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| void clear() noexcept { | ||
| mOffsets = nullptr; | ||
| } | ||
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| private: | ||
| value_type *mOffsets = nullptr; | ||
| }; | ||
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| } // namespace filament::backend | ||
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| #endif //TNT_FILAMENT_BACKEND_COMMANDSTREAMVECTOR_H |
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