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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/vr/elements/scaled_depth_adjuster.h"
namespace vr {
ScaledDepthAdjuster::ScaledDepthAdjuster(float delta_z) : delta_z_(delta_z) {
SetType(kTypeScaledDepthAdjuster);
set_contributes_to_parent_bounds(false);
}
ScaledDepthAdjuster::~ScaledDepthAdjuster() = default;
gfx::Transform ScaledDepthAdjuster::LocalTransform() const {
return transform_;
}
gfx::Transform ScaledDepthAdjuster::GetTargetLocalTransform() const {
return transform_;
}
bool ScaledDepthAdjuster::OnBeginFrame(const gfx::Transform& head_pose) {
// NB: we compute our local transform only once in the first call to
// OnBeginFrame that occurs after this element's construction. This permits
// ScaledDepthAdjuster elements to be added to subtrees that are later added
// to the scene graph as opposed to requiring that the full hierarchy be
// available at the time of construction, simplifying scene graph building.
if (!transform_.IsIdentity())
return false;
gfx::Transform inherited;
for (UiElement* anc = parent(); anc; anc = anc->parent()) {
if (anc->type() == kTypeScaledDepthAdjuster) {
inherited.PostConcat(anc->LocalTransform());
}
}
transform_ = inherited.GetCheckedInverse();
gfx::Point3F o = inherited.MapPoint(gfx::Point3F());
float z = -o.z() + delta_z_;
transform_.Scale3d(z, z, z);
transform_.Translate3d(0, 0, -1);
set_world_space_transform_dirty();
return true;
}
#ifndef NDEBUG
void ScaledDepthAdjuster::DumpGeometry(std::ostringstream* os) const {
*os << "tz(" << delta_z_ << ") ";
}
#endif
} // namespace vr
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