src/dawn/native/dawn_platform.h

// Copyright 2018 The Dawn & Tint Authors
//
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//    this list of conditions and the following disclaimer in the documentation
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#ifndef SRC_DAWN_NATIVE_DAWN_PLATFORM_H_
#define SRC_DAWN_NATIVE_DAWN_PLATFORM_H_

// Use webgpu_cpp to have the enum and bitfield definitions
#include "dawn/webgpu_cpp.h"

#include "dawn/native/dawn_platform_autogen.h"

namespace dawn::native {

// kEnumCount is a constant specifying the number of enums in a WebGPU enum type,
// if the enums are contiguous, making it suitable for iteration.
// It is defined in dawn_platform_autogen.h
template <typename T>
constexpr uint32_t kEnumCount = EnumCount<T>::value;

// Extra buffer usages
// Add an extra buffer usage and an extra binding type for binding the buffers with QueryResolve
// usage as storage buffer in the internal pipeline.
static constexpr wgpu::BufferUsage kInternalStorageBuffer =
    static_cast<wgpu::BufferUsage>(1u << 31);

// Add an extra buffer usage (readonly storage buffer usage) for render pass resource tracking
static constexpr wgpu::BufferUsage kReadOnlyStorageBuffer =
    static_cast<wgpu::BufferUsage>(1u << 30);

static constexpr wgpu::BufferUsage kAllInternalBufferUsages =
    kInternalStorageBuffer | kReadOnlyStorageBuffer;

// Extra texture usages
// Usage to denote an extra tag value used in system specific ways.
//  - Used to store that attachments are used more than once in PassResourceUsageTracker.
//  - Used to store mixed read-only vs. not depth-stencil layouts in Vulkan.
static constexpr wgpu::TextureUsage kReservedTextureUsage =
    static_cast<wgpu::TextureUsage>(1u << 31);

// Extrea texture usages for textures that are used with the presentation engine.
// Acquire is that Dawn is acquiring the texture from the presentation engine while Release is Dawn
// releasing is to the presentation engine.
static constexpr wgpu::TextureUsage kPresentAcquireTextureUsage =
    static_cast<wgpu::TextureUsage>(1u << 30);
static constexpr wgpu::TextureUsage kPresentReleaseTextureUsage =
    static_cast<wgpu::TextureUsage>(1u << 29);

// Add an extra texture usage (readonly render attachment usage) for render pass resource
// tracking
static constexpr wgpu::TextureUsage kReadOnlyRenderAttachment =
    static_cast<wgpu::TextureUsage>(1u << 28);

// Add an extra texture usage (readonly storage texture usage) for resource tracking
static constexpr wgpu::TextureUsage kReadOnlyStorageTexture =
    static_cast<wgpu::TextureUsage>(1u << 27);

// Add an extra texture usage (writeonly storage texture usage) for resource tracking
static constexpr wgpu::TextureUsage kWriteOnlyStorageTexture =
    static_cast<wgpu::TextureUsage>(1u << 26);

// Add an extra texture usage (load resolve texture to MSAA) for render pass resource tracking
static constexpr wgpu::TextureUsage kResolveAttachmentLoadingUsage =
    static_cast<wgpu::TextureUsage>(1u << 25);

// Extra BufferBindingType for internal storage buffer binding.
static constexpr wgpu::BufferBindingType kInternalStorageBufferBinding =
    static_cast<wgpu::BufferBindingType>(~0u);

// Extra TextureSampleType for sampling from a resolve attachment.
static constexpr wgpu::TextureSampleType kInternalResolveAttachmentSampleType =
    static_cast<wgpu::TextureSampleType>(~0u);
}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_DAWN_PLATFORM_H_