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58 lines
1.6 KiB
C++
58 lines
1.6 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 <functional>
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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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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, 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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private:
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PipelineRegs::TriangleTopology topology;
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int buffer_index;
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VertexType buffer[2];
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bool strip_ready = false;
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bool winding = false;
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};
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} // namespace Pica
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