WebGPU 的新变化 (Chrome 118)

François Beaufort
François Beaufort

copyExternalImageToTexture() 中支持 HTMLImageElement 和 ImageData

借助 GPUQueue 上的 copyExternalImageToTexture() 方法,您可以将源图片、视频或画布中的快照复制到指定的 GPUTexture。您现在可以将 HTMLImageElementImageData 对象作为来源传递。请参阅以下示例并问题 chromium:1471372

// Fetch and decode image.
const source = document.createElement("img");
source.src = "my-image.png";
await source.decode();

// Create destination texture.
const size = [source.width, source.height];
const texture = myDevice.createTexture({
 size,
 format: "rgba8unorm",
 usage:
   GPUTextureUsage.COPY_DST |
   GPUTextureUsage.RENDER_ATTACHMENT |
   GPUTextureUsage.TEXTURE_BINDING,
});

// Copies a snapshot taken from the source image into a texture.
myDevice.queue.copyExternalImageToTexture({ source }, { texture }, size);

对读写和只读存储纹理的实验性支持

存储纹理绑定类型允许您在不采样的情况下执行纹理读取,并将其存储到着色器中的任意位置。当 GPUAdapter 中提供 "chromium-experimental-read-write-storage-texture" 功能时,您现在可以使用该功能请求 GPUDevice,并在创建绑定组布局时将 GPUStorageTexture 访问权限设置为 "read-write""read-only"。之前,只有 "write-only" 可以使用。

为了利用这一点,您必须在 WGSL 代码中使用 enable chromium_experimental_read_write_storage_texture 明确启用此扩展。启用后,您可以将 read_writeread 访问限定符用于存储纹理,textureLoad()textureStore() 内置函数会相应地运行,并且有新的 textureBarrier() 内置函数可用于同步工作组中的纹理内存访问。请参阅以下示例和issue dawn:1972

此功能仍处于实验阶段,可能会有所变化。在标准化期间,运行带有 --enable-dawn-features=allow_unsafe_apis 标志的 Chrome 以使其可供使用。

const feature = "chromium-experimental-read-write-storage-texture";
const adapter = await navigator.gpu.requestAdapter();
if (!adapter.features.has(feature)) {
  throw new Error("Read-write storage texture support is not available");
}
// Explicitly request read-write storage texture support.
const device = await adapter.requestDevice({
  requiredFeatures: [feature],
});

const bindGroupLayout = device.createBindGroupLayout({
  entries: [{
    binding: 0,
    visibility: GPUShaderStage.COMPUTE,
    storageTexture: {
      access: "read-write", // <-- New!
      format: "r32uint",
    },
  }],
});

const shaderModule = device.createShaderModule({ code: `
  enable chromium_experimental_read_write_storage_texture;
  @group(0) @binding(0) var tex : texture_storage_2d<r32uint, read_write>;

  @compute @workgroup_size(1, 1)
  fn main(@builtin(local_invocation_id) local_id: vec3u) {
    var data = textureLoad(tex, vec2i(local_id.xy));
    data.x *= 2;
    textureStore(tex, vec2i(local_id.xy), data);
  }`,
});

// You can now create a compute pipeline with this shader module and
// send the appropriate commands to the GPU.

Dawn 最新动态

为保持一致性,webgpu.h C API 已将以下字段重命名为:requiredFeaturesCount 重命名为 requiredFeatureCountpipelineStatisticsCount 重命名为 pipelineStatisticCountcolorFormatsCount 重命名为 colorFormatCount。请参阅问题 dawn:146040

新的 DawnInfo 程序(类似于 vulkaninfo)允许您列出切换开关、适配器、适配器功能和适配器限制。可在构建黎明 samples 时使用。为简洁起见,以下输出经过大量删减。请参阅 change dawn:149020

./out/Debug/DawnInfo
Toggles
=======
  Name: allow_unsafe_apis
    Suppresses validation errors on API entry points or parameter combinations
    that aren't considered secure yet.
    http://crbug.com/1138528
[…]

Adapter
=======
VendorID: 0x106B
Vendor: apple
Architecture: common-3
DeviceID: 0x0000
Name: Apple M1 Pro
Driver description: Metal driver on macOS Version 13.5.1 (Build 22G90)
Adapter Type: discrete GPU
Backend Type: Metal
Power: <undefined>

  Features
  ========
   * depth_clip_control
      Disable depth clipping of primitives to the clip volume
      https://bugs.chromium.org/p/dawn/issues/detail?id=1178
[…]

  Adapter Limits
  ==============
    maxTextureDimension1D: 16,384
    maxTextureDimension2D: 16,384
[…]

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WebGPU 的新变化

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Chrome 128

Chrome 127

Chrome 126

Chrome 125

Chrome 124

Chrome 123

Chrome 122

Chrome 121

Chrome 120

Chrome 119

Chrome 118

Chrome 117

Chrome 116

Chrome 115

Chrome 114

Chrome 113