content_mapblock.h

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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.
 
You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
 
#pragma once
 
#include "nodedef.h"
#include <IMeshManipulator.h>
 
struct MeshMakeData;
struct MeshCollector;
 
struct LightPair {
    u8 lightDay;
    u8 lightNight;
 
    LightPair() = default;
    explicit LightPair(u16 value) : lightDay(value & 0xff), lightNight(value >> 8) {}
    LightPair(u8 valueA, u8 valueB) : lightDay(valueA), lightNight(valueB) {}
    LightPair(float valueA, float valueB) :
        lightDay(core::clamp(core::round32(valueA), 0, 255)),
        lightNight(core::clamp(core::round32(valueB), 0, 255)) {}
    operator u16() const { return lightDay | lightNight << 8; }
};
 
struct LightInfo {
    float light_day;
    float light_night;
    float light_boosted;
 
    LightPair getPair(float sunlight_boost = 0.0) const
    {
        return LightPair(
            (1 - sunlight_boost) * light_day
            + sunlight_boost * light_boosted,
            light_night);
    }
};
 
struct LightFrame {
    f32 lightsDay[8];
    f32 lightsNight[8];
    bool sunlight[8];
};
 
class MapblockMeshGenerator
{
public:
    MapblockMeshGenerator(MeshMakeData *input, MeshCollector *output,
            scene::IMeshManipulator *mm);
    void generate();
    void renderSingle(content_t node, u8 param2 = 0x00);
 
private:
    MeshMakeData *const data;
    MeshCollector *const collector;
 
    const NodeDefManager *const nodedef;
    scene::IMeshManipulator *const meshmanip;
 
    const v3s16 blockpos_nodes;
 
// options
    const bool enable_mesh_cache;
 
// current node
    struct {
        v3s16 p;
        v3f origin;
        MapNode n;
        const ContentFeatures *f;
        LightPair light;
        LightFrame frame;
        video::SColor color;
        TileSpec tile;
        f32 scale;
    } cur_node;
 
// lighting
    void getSmoothLightFrame();
    LightInfo blendLight(const v3f &vertex_pos);
    video::SColor blendLightColor(const v3f &vertex_pos);
    video::SColor blendLightColor(const v3f &vertex_pos, const v3f &vertex_normal);
 
    void useTile(int index = 0, u8 set_flags = MATERIAL_FLAG_CRACK_OVERLAY,
        u8 reset_flags = 0, bool special = false);
    void getTile(int index, TileSpec *tile);
    void getTile(v3s16 direction, TileSpec *tile);
    void getSpecialTile(int index, TileSpec *tile, bool apply_crack = false);
 
// face drawing
    void drawQuad(v3f *vertices, const v3s16 &normal = v3s16(0, 0, 0),
        float vertical_tiling = 1.0);
 
// cuboid drawing!
    template <typename Fn>
    void drawCuboid(const aabb3f &box, TileSpec *tiles, int tilecount, const f32 *txc, u8 mask, Fn &&face_lighter);
    void generateCuboidTextureCoords(aabb3f const &box, f32 *coords);
    void drawAutoLightedCuboid(aabb3f box, f32 const *txc = nullptr, TileSpec *tiles = nullptr, int tile_count = 0, u8 mask = 0);
    u8 getNodeBoxMask(aabb3f box, u8 solid_neighbors, u8 sametype_neighbors) const;
 
// liquid-specific
    struct LiquidData {
        struct NeighborData {
            f32 level;
            content_t content;
            bool is_same_liquid;
            bool top_is_same_liquid;
        };
 
        bool top_is_same_liquid;
        bool draw_bottom;
        TileSpec tile;
        TileSpec tile_top;
        content_t c_flowing;
        content_t c_source;
        video::SColor color_top;
        NeighborData neighbors[3][3];
        f32 corner_levels[2][2];
    };
    LiquidData cur_liquid;
 
    void prepareLiquidNodeDrawing();
    void getLiquidNeighborhood();
    void calculateCornerLevels();
    f32 getCornerLevel(int i, int k) const;
    void drawLiquidSides();
    void drawLiquidTop();
    void drawLiquidBottom();
 
// raillike-specific
    // name of the group that enables connecting to raillike nodes of different kind
    static const std::string raillike_groupname;
    struct RaillikeData {
        int raillike_group;
    };
    RaillikeData cur_rail;
    bool isSameRail(v3s16 dir);
 
// plantlike-specific
    struct PlantlikeData {
        PlantlikeStyle draw_style;
        v3f offset;
        float rotate_degree;
        bool random_offset_Y;
        int face_num;
        float plant_height;
    };
    PlantlikeData cur_plant;
 
    void drawPlantlikeQuad(float rotation, float quad_offset = 0,
        bool offset_top_only = false);
    void drawPlantlike(bool is_rooted = false);
 
// firelike-specific
    void drawFirelikeQuad(float rotation, float opening_angle,
        float offset_h, float offset_v = 0.0);
 
// drawtypes
    void drawSolidNode();
    void drawLiquidNode();
    void drawGlasslikeNode();
    void drawGlasslikeFramedNode();
    void drawAllfacesNode();
    void drawTorchlikeNode();
    void drawSignlikeNode();
    void drawPlantlikeNode();
    void drawPlantlikeRootedNode();
    void drawFirelikeNode();
    void drawFencelikeNode();
    void drawRaillikeNode();
    void drawNodeboxNode();
    void drawMeshNode();
 
// common
    void errorUnknownDrawtype();
    void drawNode();
};