<!DOCTYPE html>
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="file:///gen/layout_test_data/mojo/public/js/mojo_bindings.js"></script>
<script src="file:///gen/device/vr/public/mojom/vr_service.mojom.js"></script>
<script src="../external/wpt/resources/chromium/webxr-test.js"></script>
<script src="../external/wpt/webxr/resources/webxr_test_constants.js"></script>
<script src="../xr/resources/xr-internal-device-mocking.js"></script>
<script src="../xr/resources/xr-test-utils.js"></script>
<canvas id="webgl-canvas"></canvas>

<script>
let testName =
  "'floor-level' XRStationaryReferenceSpace updates properly when the transform changes";

let fakeDeviceInitParams = { supportsImmersive:true };

let requestSessionModes = [
  'inline',
  'immersive-vr',
];

let testFunction = function(session, t, fakeDeviceController) {
  // Session must have a baseLayer or else frame requests will be ignored.
  session.updateRenderState({
    baseLayer: new XRWebGLLayer(session, gl, {
        compositionDisabled: session.mode == 'inline' })
  });

  fakeDeviceController.setStageTransform(null);
  fakeDeviceController.setXRPresentationFrameData(ORIGIN_POSE, [{
      eye:"left",
      projectionMatrix: VALID_PROJECTION_MATRIX,
      viewMatrix: VALID_VIEW_MATRIX
    }, {
      eye:"right",
      projectionMatrix: VALID_PROJECTION_MATRIX,
      viewMatrix: VALID_VIEW_MATRIX
    }]);

  // Don't need to request a frame/allow the stage updates to propagate before
  // requesting local-floor because if the stage transform is set it just won't
  // be emulated on the first frame, and we wait a frame before checking.
  return session.requestReferenceSpace('local-floor')
    .then((referenceSpace) => new Promise((resolve, reject) => {
      function onFirstFrame(time, xrFrame) {
        // On the first frame where the pose has been initialized, the stage
        // should be using an emulated frame of reference because it has no
        // stageParameters yet. So the pose should be ~1.5 meters off the floor.
        t.step( () => {
          let pose = xrFrame.getViewerPose(referenceSpace);

          let poseMatrix = pose.transform.matrix;
          assert_approx_equals(poseMatrix[12], 0.0, FLOAT_EPSILON);
          assert_greater_than(poseMatrix[13], 1.0);
          assert_approx_equals(poseMatrix[14], 0.0, FLOAT_EPSILON);

          fakeDeviceController.setStageTransform(VALID_STAGE_TRANSFORM);

          // Need to request one animation frame for the new stage transform to
          // propagate before we check that it's what we expect.
          session.requestAnimationFrame(() => {
            session.requestAnimationFrame(onFrame);
          });
        });
      }

      function onFrame(time, xrFrame) {
        t.step( () => {
          // Check that stage transform was updated.
          let pose = xrFrame.getViewerPose(referenceSpace);
          assert_not_equals(pose, null);

          let poseMatrix = pose.transform.matrix;
          assert_matrices_approx_equal(poseMatrix, VALID_STAGE_TRANSFORM);
        });

        // Finished.
        resolve();
      }

      // Need to wait one frame for the removal to propagate before we check that
      // everything is at the expected emulated position.
      session.requestAnimationFrame(() => {
        session.requestAnimationFrame(onFirstFrame);
      });
    }));
};

xr_session_promise_test(
  testFunction, fakeDeviceInitParams, requestSessionModes, testName);

</script>