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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
#include "third_party/blink/renderer/modules/xr/xr_render_state.h"
#include <algorithm>
#include <cmath>
#include "third_party/blink/renderer/bindings/modules/v8/v8_xr_render_state_init.h"
#include "third_party/blink/renderer/modules/xr/xr_webgl_layer.h"
namespace blink {
namespace {
// The WebXR spec specifies that the min and max are up the UA, but have to be
// within 0 and Pi. Using those exact numbers can lead to floating point math
// errors, so set them slightly inside those numbers.
constexpr double kMinFieldOfView = 0.01;
constexpr double kMaxFieldOfView = 3.13;
constexpr double kDefaultFieldOfView = M_PI * 0.5;
} // namespace
XRRenderState::XRRenderState(bool immersive) : immersive_(immersive) {
if (!immersive_)
inline_vertical_fov_ = kDefaultFieldOfView;
}
void XRRenderState::Update(const XRRenderStateInit* init) {
if (init->hasDepthNear()) {
depth_near_ = std::max(0.0, init->depthNear());
}
if (init->hasDepthFar()) {
depth_far_ = std::max(0.0, init->depthFar());
}
if (init->hasBaseLayer()) {
base_layer_ = init->baseLayer();
layers_ = MakeGarbageCollected<FrozenArray<XRLayer>>();
}
if (init->hasLayers()) {
base_layer_ = nullptr;
layers_ = init->layers()
? MakeGarbageCollected<FrozenArray<XRLayer>>(*init->layers())
: MakeGarbageCollected<FrozenArray<XRLayer>>();
}
if (init->hasInlineVerticalFieldOfView()) {
double fov = init->inlineVerticalFieldOfView();
// Clamp the value between our min and max.
fov = std::max(kMinFieldOfView, fov);
fov = std::min(kMaxFieldOfView, fov);
inline_vertical_fov_ = fov;
}
}
XRLayer* XRRenderState::GetFirstLayer() const {
if (base_layer_) {
return base_layer_.Get();
}
if (layers_->size()) {
return layers_->at(0);
}
return nullptr;
}
HTMLCanvasElement* XRRenderState::output_canvas() const {
if (base_layer_) {
return base_layer_->output_canvas();
}
return nullptr;
}
std::optional<double> XRRenderState::inlineVerticalFieldOfView() const {
if (immersive_)
return std::nullopt;
return inline_vertical_fov_;
}
void XRRenderState::Trace(Visitor* visitor) const {
visitor->Trace(base_layer_);
visitor->Trace(layers_);
ScriptWrappable::Trace(visitor);
}
} // namespace blink
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