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<!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>
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