collector.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2018 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>
 
#pragma once
#include <array>
#include <vector>
#include "irrlichttypes.h"
#include "irr_v3d.h"
#include <S3DVertex.h>
#include "client/tile.h"
 
struct PreMeshBuffer
{
        TileLayer layer;
        std::vector<u16> indices;
        std::vector<video::S3DVertex> vertices;
 
        PreMeshBuffer() = default;
        explicit PreMeshBuffer(const TileLayer &layer) : layer(layer) {}
 
        bool empty() const {
                return indices.empty();
        }
 
        void applyTileColor()
        {
                video::SColor tc = layer.color;
                if (tc == video::SColor(0xFFFFFFFF))
                        return;
                for (auto &vertex : vertices) {
                        video::SColor *c = &vertex.Color;
                        c->set(c->getAlpha(),
                                c->getRed() * tc.getRed() / 255U,
                                c->getGreen() * tc.getGreen() / 255U,
                                c->getBlue() * tc.getBlue() / 255U);
                }
        }
 
        bool append(const PreMeshBuffer &other);
};
 
struct MeshCollector
{
        std::array<std::vector<PreMeshBuffer>, MAX_TILE_LAYERS> prebuffers;
        // bounding sphere radius and center
        f32 m_bounding_radius_sq = 0.0f;
        v3f m_center_pos;
        v3f offset;
 
        // center_pos: pos to use for bounding-sphere, in BS-space
        // offset: offset added to vertices
        MeshCollector(const v3f center_pos, v3f offset = v3f()) : m_center_pos(center_pos), offset(offset) {}
 
        void append(const TileSpec &material,
                        const video::S3DVertex *vertices, u32 numVertices,
                        const u16 *indices, u32 numIndices);
 
private:
        void append(const TileLayer &material,
                        const video::S3DVertex *vertices, u32 numVertices,
                        const u16 *indices, u32 numIndices,
                        u8 layernum);
 
        PreMeshBuffer &findBuffer(const TileLayer &layer, u8 layernum, u32 numVertices);
};