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