ordering-table.hh

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/*
 
MIT License
 
Copyright (c) 2024 PCSX-Redux authors
 
Permission is hereby granted, free of charge, to any person obtaining a copy
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*/
 
#pragma once
 
#include <EASTL/algorithm.h>
#include <stdint.h>
 
#include "psyqo/fragment-concept.hh"
#include "psyqo/shared.hh"
 
namespace psyqo {
 
class GPU;
 
class OrderingTableBase {
  protected:
    static void clear(uint32_t* table, size_t size);
};
 
template <size_t N = 4096, Safe safety = Safe::Yes>
class OrderingTable : private OrderingTableBase {
  public:
    OrderingTable() { clear(); }
 
    void clear() { OrderingTableBase::clear(m_table, N); }
 
    template <Fragment Frag>
    void insert(Frag& frag, int32_t z) {
        // TODO: cater for big packets
        uint32_t* table = m_table + 1;
        uint32_t* head = &frag.head;
        if constexpr (safety == Safe::Yes) {
            z = eastl::clamp(z, int32_t(0), int32_t(N - 1));
        }
        *head = (frag.getActualFragmentSize() << 24) | table[z];
        table[z] = reinterpret_cast<uint32_t>(head) & 0xffffff;
    }
 
  private:
    uint32_t m_table[N + 1];
    friend class GPU;
};
 
}  // namespace psyqo