| // Copyright 2019 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 SRC_DAWN_NATIVE_FORMAT_H_ |
| #define SRC_DAWN_NATIVE_FORMAT_H_ |
| |
| #include <array> |
| |
| #include "dawn/native/dawn_platform.h" |
| |
| #include "dawn/common/TypedInteger.h" |
| #include "dawn/common/ityp_array.h" |
| #include "dawn/common/ityp_bitset.h" |
| #include "dawn/native/EnumClassBitmasks.h" |
| #include "dawn/native/Error.h" |
| #include "dawn/native/Subresource.h" |
| |
| // About multi-planar formats. |
| // |
| // Dawn supports additional multi-planar formats when the multiplanar-formats extension is enabled. |
| // When enabled, Dawn treats planar data as sub-resources (ie. 1 sub-resource == 1 view == 1 plane). |
| // A multi-planar format name encodes the channel mapping and order of planes. For example, |
| // R8BG8Biplanar420Unorm is YUV 4:2:0 where Plane 0 = R8, and Plane 1 = BG8. |
| // |
| // Requirements: |
| // * Plane aspects cannot be combined with color, depth, or stencil aspects. |
| // * Only compatible multi-planar formats of planes can be used with multi-planar texture |
| // formats. |
| // * Can't access multiple planes without creating per plane views (no color conversion). |
| // * Multi-planar format cannot be written or read without a per plane view. |
| // |
| // TODO(dawn:551): Consider moving this comment. |
| |
| namespace dawn::native { |
| |
| enum class Aspect : uint8_t; |
| class DeviceBase; |
| |
| // This mirrors wgpu::TextureSampleType as a bitmask instead. |
| enum class SampleTypeBit : uint8_t { |
| None = 0x0, |
| Float = 0x1, |
| UnfilterableFloat = 0x2, |
| Depth = 0x4, |
| Sint = 0x8, |
| Uint = 0x10, |
| }; |
| |
| // Converts a wgpu::TextureSampleType to its bitmask representation. |
| SampleTypeBit SampleTypeToSampleTypeBit(wgpu::TextureSampleType sampleType); |
| |
| struct TexelBlockInfo { |
| uint32_t byteSize; |
| uint32_t width; |
| uint32_t height; |
| }; |
| |
| enum class TextureComponentType { |
| Float, |
| Sint, |
| Uint, |
| }; |
| |
| struct AspectInfo { |
| TexelBlockInfo block; |
| TextureComponentType baseType{}; |
| SampleTypeBit supportedSampleTypes{}; |
| wgpu::TextureFormat format = wgpu::TextureFormat::Undefined; |
| }; |
| |
| // The number of formats Dawn knows about. Asserts in BuildFormatTable ensure that this is the |
| // exact number of known format. |
| static constexpr uint32_t kKnownFormatCount = 95; |
| |
| using FormatIndex = TypedInteger<struct FormatIndexT, uint32_t>; |
| |
| struct Format; |
| using FormatTable = ityp::array<FormatIndex, Format, kKnownFormatCount>; |
| |
| // A wgpu::TextureFormat along with all the information about it necessary for validation. |
| struct Format { |
| wgpu::TextureFormat format = wgpu::TextureFormat::Undefined; |
| |
| // TODO(crbug.com/dawn/1332): These members could be stored in a Format capability matrix. |
| bool isRenderable = false; |
| bool isCompressed = false; |
| // A format can be known but not supported because it is part of a disabled extension. |
| bool isSupported = false; |
| bool supportsStorageUsage = false; |
| bool supportsMultisample = false; |
| bool supportsResolveTarget = false; |
| Aspect aspects{}; |
| // Only used for renderable color formats: |
| uint8_t componentCount = 0; // number of color channels |
| uint8_t renderTargetPixelByteCost = 0; // byte cost of pixel in render targets |
| uint8_t renderTargetComponentAlignment = 0; // byte alignment for components in render targets |
| |
| bool IsColor() const; |
| bool HasDepth() const; |
| bool HasStencil() const; |
| bool HasDepthOrStencil() const; |
| bool HasAlphaChannel() const; |
| |
| // IsMultiPlanar() returns true if the format allows selecting a plane index. This is only |
| // allowed by multi-planar formats (ex. NV12). |
| bool IsMultiPlanar() const; |
| |
| const AspectInfo& GetAspectInfo(wgpu::TextureAspect aspect) const; |
| const AspectInfo& GetAspectInfo(Aspect aspect) const; |
| |
| // The index of the format in the list of all known formats: a unique number for each format |
| // in [0, kKnownFormatCount) |
| FormatIndex GetIndex() const; |
| |
| // baseFormat represents the memory layout of the format. |
| // If two formats has the same baseFormat, they could copy to and be viewed as the other |
| // format. Currently two formats have the same baseFormat if they differ only in sRGB-ness. |
| wgpu::TextureFormat baseFormat = wgpu::TextureFormat::Undefined; |
| |
| // Returns true if the formats are copy compatible. |
| // Currently means they differ only in sRGB-ness. |
| bool CopyCompatibleWith(const Format& format) const; |
| |
| // Returns true if the formats are texture view format compatible. |
| // Currently means they differ only in sRGB-ness. |
| bool ViewCompatibleWith(const Format& format) const; |
| |
| private: |
| // Used to store the aspectInfo for one or more planes. For single plane "color" formats, |
| // only the first aspect info or aspectInfo[0] is valid. For depth-stencil, the first aspect |
| // info is depth and the second aspect info is stencil. For multi-planar formats, |
| // aspectInfo[i] is the ith plane. |
| std::array<AspectInfo, kMaxPlanesPerFormat> aspectInfo{}; |
| |
| friend FormatTable BuildFormatTable(const DeviceBase* device); |
| }; |
| |
| class FormatSet : public ityp::bitset<FormatIndex, kKnownFormatCount> { |
| using Base = ityp::bitset<FormatIndex, kKnownFormatCount>; |
| |
| public: |
| using Base::Base; |
| using Base::operator[]; |
| |
| bool operator[](const Format& format) const; |
| typename Base::reference operator[](const Format& format); |
| }; |
| |
| // Implementation details of the format table in the device. |
| |
| // Returns the index of a format in the FormatTable. |
| FormatIndex ComputeFormatIndex(wgpu::TextureFormat format); |
| // Builds the format table with the extensions enabled on the device. |
| FormatTable BuildFormatTable(const DeviceBase* device); |
| |
| } // namespace dawn::native |
| |
| namespace dawn { |
| |
| template <> |
| struct IsDawnBitmask<dawn::native::SampleTypeBit> { |
| static constexpr bool enable = true; |
| }; |
| |
| } // namespace dawn |
| |
| #endif // SRC_DAWN_NATIVE_FORMAT_H_ |