xrWebGLLayer_framebuffer_scale.https.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /webxr/xrWebGLLayer_framebuffer_scale.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/webxr_util.js"></script>

<script src="resources/webxr_test_constants.js"></script>

<script>

let testName = "Ensure framebuffer scaling works as expected.";

let fakeDeviceInitParams = TRACKED_IMMERSIVE_DEVICE;

let testFunction =

  (session, fakeDeviceController, t, sessionObjects) => new Promise((resolve, reject) => {

  let gl = sessionObjects.gl;

  let webglLayer = sessionObjects.glLayer;

  let defaultFramebufferWidth = webglLayer.framebufferWidth;

  let defaultFramebufferHeight = webglLayer.framebufferHeight;

  let nativeScale = XRWebGLLayer.getNativeFramebufferScaleFactor(session);

  t.step(() => {

    // Ensure the framebuffer default sizes and native scale are all non-zero.

    assert_greater_than(defaultFramebufferWidth, 0);

    assert_greater_than(defaultFramebufferHeight, 0);

    assert_greater_than(nativeScale, 0);

    // The native scale should be the inverse for the default framebuffer scale.

    assert_approx_equals(nativeScale, 1/fakeDeviceController.defaultFramebufferScale_, FLOAT_EPSILON);

});

  webglLayer = new XRWebGLLayer(session, gl, { framebufferScaleFactor: nativeScale });

  t.step(() => {

    // Ensure that requesting a native scale framebuffer gives the expected result.

    assert_approx_equals(webglLayer.framebufferWidth, defaultFramebufferWidth*nativeScale, 2);

    assert_approx_equals(webglLayer.framebufferHeight, defaultFramebufferHeight*nativeScale, 2);

});

  webglLayer = new XRWebGLLayer(session, gl, { framebufferScaleFactor: 0 });

  t.step(() => {

    // Ensure that the framebuffer has a lower bounds clamp.

    assert_greater_than(webglLayer.framebufferWidth, 0);

    assert_greater_than(webglLayer.framebufferHeight, 0);

});

  webglLayer = new XRWebGLLayer(session, gl, { framebufferScaleFactor: 100 });

  t.step(() => {

    // Ensure that the framebuffer has a reasonable upper bounds clamp.

    assert_less_than(webglLayer.framebufferWidth, defaultFramebufferWidth*100);

    assert_less_than(webglLayer.framebufferHeight, defaultFramebufferHeight*100);

});

  resolve();

});

xr_session_promise_test(

  testName, testFunction, fakeDeviceInitParams, 'immersive-vr');

</script>