80 lines
2.3 KiB
C++
80 lines
2.3 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <array>
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#include <functional>
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#include <boost/serialization/access.hpp>
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#include <boost/serialization/array.hpp>
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#include "video_core/regs_pipeline.h"
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namespace Pica {
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/*
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* Utility class to build triangles from a series of vertices,
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* according to a given triangle topology.
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*/
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template <typename VertexType>
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struct PrimitiveAssembler {
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using TriangleHandler =
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std::function<void(const VertexType& v0, const VertexType& v1, const VertexType& v2)>;
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explicit PrimitiveAssembler(
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PipelineRegs::TriangleTopology topology = PipelineRegs::TriangleTopology::List);
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/*
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* Queues a vertex, builds primitives from the vertex queue according to the given
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* triangle topology, and calls triangle_handler for each generated primitive.
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* NOTE: We could specify the triangle handler in the constructor, but this way we can
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* keep event and handler code next to each other.
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*/
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void SubmitVertex(const VertexType& vtx, const TriangleHandler& triangle_handler);
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/**
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* Invert the vertex order of the next triangle. Called by geometry shader emitter.
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* This only takes effect for TriangleTopology::Shader.
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*/
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void SetWinding();
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/**
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* Resets the internal state of the PrimitiveAssembler.
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*/
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void Reset();
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/**
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* Reconfigures the PrimitiveAssembler to use a different triangle topology.
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*/
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void Reconfigure(PipelineRegs::TriangleTopology topology);
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/**
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* Returns whether the PrimitiveAssembler has an empty internal buffer.
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*/
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bool IsEmpty() const;
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/**
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* Returns the current topology.
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*/
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PipelineRegs::TriangleTopology GetTopology() const;
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private:
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PipelineRegs::TriangleTopology topology;
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int buffer_index = 0;
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std::array<VertexType, 2> buffer;
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bool strip_ready = false;
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bool winding = false;
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template <class Archive>
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void serialize(Archive& ar, const unsigned int version) {
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ar& topology;
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ar& buffer_index;
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ar& boost::serialization::make_array(buffer.data(), buffer.size());
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ar& strip_ready;
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ar& winding;
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}
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friend class boost::serialization::access;
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};
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} // namespace Pica
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