greggman · January 8, 2026 18:21
diff --git a/README.md b/README.md
diff --git a/index.css b/index.css
 /*bug-in-github-api-content-can-not-be-empty*/
diff --git a/index.html b/index.html
 /*bug-in-github-api-content-can-not-be-empty*/
diff --git a/index.js b/index.js
 const adapter = await navigator.gpu.requestAdapter();
 const device = await adapter.requestDevice({
  requiredFeatures: ['primitive-index'],
 });
 if (!device) {
  fail('no device');
 }
 console.log('features:', [...device.features].join(', '));

 device.addEventListener('uncapturederror', e => console.error(e.error.message));

 device.createShaderModule({
  code: `
    requires primitive_index;

    struct VSOut {
      @builtin(position) p: vec4f,
    }
    struct FSIn {
      @builtin(primitive_index) i_0: u32,
    }

    struct FSOut {
      @location(0) color: vec4f,
    }

    @vertex fn vs() -> VSOut {
      var o: VSOut;
      o.p = vec4f(0);
      return o;
    }

    @fragment fn fs(i: FSIn) -> FSOut {
      var o: FSOut;

      o.color = vec4f(0);
      return o;
    }
  `,
 })
 device.queue.submit([]);

diff --git a/jsGist.json b/jsGist.json
 {"name":"WebGPU: primitive-index test","settings":{},"filenames":["index.html","index.css","index.js"]}
	const adapter = await navigator.gpu.requestAdapter();
	const device = await adapter.requestDevice({
	requiredFeatures: ['primitive-index'],
	});
	if (!device) {
	fail('no device');
	}
	console.log('features:', [...device.features].join(', '));

	device.addEventListener('uncapturederror', e => console.error(e.error.message));

	device.createShaderModule({
	code: `
	requires primitive_index;

	struct VSOut {
	@builtin(position) p: vec4f,
	}
	struct FSIn {
	@builtin(primitive_index) i_0: u32,
	}

	struct FSOut {
	@location(0) color: vec4f,
	}

	@vertex fn vs() -> VSOut {
	var o: VSOut;
	o.p = vec4f(0);
	return o;
	}

	@fragment fn fs(i: FSIn) -> FSOut {
	var o: FSOut;

	o.color = vec4f(0);
	return o;
	}
	`,
	})
	device.queue.submit([]);
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