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/*
* Copyright (C) 2024 Jani Hautakangas <jani@kodegood.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "FloatPolygon3D.h"
#include "FloatQuad.h"
#include "TextureMapperLayer.h"
#include <wtf/HashSet.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class ClipPath;
class FloatPlane3D;
class TextureMapper;
class TextureMapperLayer3DRenderingContext final {
WTF_MAKE_TZONE_ALLOCATED(TextureMapperLayerPreserves3DContext);
public:
void paint(TextureMapper&, const Vector<TextureMapperLayer*>&,
const std::function<void(TextureMapperLayer*, const ClipPath&)>&);
private:
enum class LayerPosition {
InFront,
Behind,
Coplanar,
Intersecting
};
struct BoundingBox final {
FloatPoint3D min;
FloatPoint3D max;
};
struct Layer final {
FloatPolygon3D geometry;
BoundingBox boundingBox;
TextureMapperLayer* textureMapperLayer { nullptr };
bool isSplitted { false };
unsigned clipVertexBufferOffset { 0 };
};
struct LayerNode final {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
explicit LayerNode(Layer&& layer)
{
layers.append(WTFMove(layer));
}
const Layer& firstLayer() const { return layers[0]; }
Vector<Layer> layers;
std::unique_ptr<LayerNode> frontNode;
std::unique_ptr<LayerNode> backNode;
};
using SweepAndPrunePairs = HashSet<std::pair<size_t, size_t>>;
static BoundingBox computeBoundingBox(const FloatPolygon3D&);
static SweepAndPrunePairs sweepAndPrune(const Vector<Layer>&);
static void buildTree(LayerNode&, Deque<Layer>&);
static void traverseTree(LayerNode&, const std::function<void(LayerNode&)>&);
static LayerPosition classifyLayer(const Layer&, const FloatPlane3D&);
};
} // namespace WebCore
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