mapblock_mesh.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 "irrlichttypes_extrabloated.h"
#include "client/tile.h"
#include "voxel.h"
#include <array>
#include <map>
 
class Client;
class IShaderSource;
 
/*
    Mesh making stuff
*/
 
 
class MapBlock;
struct MinimapMapblock;
 
struct MeshMakeData
{
    VoxelManipulator m_vmanip;
    v3s16 m_blockpos = v3s16(-1337,-1337,-1337);
    v3s16 m_crack_pos_relative = v3s16(-1337,-1337,-1337);
    bool m_smooth_lighting = false;
 
    Client *m_client;
    bool m_use_shaders;
 
    MeshMakeData(Client *client, bool use_shaders);
 
    /*
        Copy block data manually (to allow optimizations by the caller)
    */
    void fillBlockDataBegin(const v3s16 &blockpos);
    void fillBlockData(const v3s16 &block_offset, MapNode *data);
 
    /*
        Copy central data directly from block, and other data from
        parent of block.
    */
    void fill(MapBlock *block);
 
    /*
        Set the (node) position of a crack
    */
    void setCrack(int crack_level, v3s16 crack_pos);
 
    /*
        Enable or disable smooth lighting
    */
    void setSmoothLighting(bool smooth_lighting);
};
 
/*
    Holds a mesh for a mapblock.
 
    Besides the SMesh*, this contains information used for animating
    the vertex positions, colors and texture coordinates of the mesh.
    For example:
    - cracks [implemented]
    - day/night transitions [implemented]
    - animated flowing liquids [not implemented]
    - animating vertex positions for e.g. axles [not implemented]
*/
class MapBlockMesh
{
public:
    // Builds the mesh given
    MapBlockMesh(MeshMakeData *data, v3s16 camera_offset);
    ~MapBlockMesh();
 
    // Main animation function, parameters:
    //   faraway: whether the block is far away from the camera (~50 nodes)
    //   time: the global animation time, 0 .. 60 (repeats every minute)
    //   daynight_ratio: 0 .. 1000
    //   crack: -1 .. CRACK_ANIMATION_LENGTH-1 (-1 for off)
    // Returns true if anything has been changed.
    bool animate(bool faraway, float time, int crack, u32 daynight_ratio);
 
    scene::IMesh *getMesh()
    {
        return m_mesh[0];
    }
 
    scene::IMesh *getMesh(u8 layer)
    {
        return m_mesh[layer];
    }
 
    MinimapMapblock *moveMinimapMapblock()
    {
        MinimapMapblock *p = m_minimap_mapblock;
        m_minimap_mapblock = NULL;
        return p;
    }
 
    bool isAnimationForced() const
    {
        return m_animation_force_timer == 0;
    }
 
    void decreaseAnimationForceTimer()
    {
        if(m_animation_force_timer > 0)
            m_animation_force_timer--;
    }
 
private:
    scene::IMesh *m_mesh[MAX_TILE_LAYERS];
    MinimapMapblock *m_minimap_mapblock;
    ITextureSource *m_tsrc;
    IShaderSource *m_shdrsrc;
 
    bool m_enable_shaders;
    bool m_enable_vbo;
 
    // Must animate() be called before rendering?
    bool m_has_animation;
    int m_animation_force_timer;
 
    // Animation info: cracks
    // Last crack value passed to animate()
    int m_last_crack;
    // Maps mesh and mesh buffer (i.e. material) indices to base texture names
    std::map<std::pair<u8, u32>, std::string> m_crack_materials;
 
    // Animation info: texture animationi
    // Maps mesh and mesh buffer indices to TileSpecs
    // Keys are pairs of (mesh index, buffer index in the mesh)
    std::map<std::pair<u8, u32>, TileLayer> m_animation_tiles;
    std::map<std::pair<u8, u32>, int> m_animation_frames; // last animation frame
    std::map<std::pair<u8, u32>, int> m_animation_frame_offsets;
 
    // Animation info: day/night transitions
    // Last daynight_ratio value passed to animate()
    u32 m_last_daynight_ratio;
    // For each mesh and mesh buffer, stores pre-baked colors
    // of sunlit vertices
    // Keys are pairs of (mesh index, buffer index in the mesh)
    std::map<std::pair<u8, u32>, std::map<u32, video::SColor > > m_daynight_diffs;
};
 
video::SColor encode_light(u16 light, u8 emissive_light);
 
// Compute light at node
u16 getInteriorLight(MapNode n, s32 increment, const NodeDefManager *ndef);
u16 getFaceLight(MapNode n, MapNode n2, const v3s16 &face_dir,
    const NodeDefManager *ndef);
u16 getSmoothLightSolid(const v3s16 &p, const v3s16 &face_dir, const v3s16 &corner, MeshMakeData *data);
u16 getSmoothLightTransparent(const v3s16 &p, const v3s16 &corner, MeshMakeData *data);
 
void get_sunlight_color(video::SColorf *sunlight, u32 daynight_ratio);
 
void final_color_blend(video::SColor *result,
        u16 light, u32 daynight_ratio);
 
void final_color_blend(video::SColor *result,
        const video::SColor &data, const video::SColorf &dayLight);
 
// Retrieves the TileSpec of a face of a node
// Adds MATERIAL_FLAG_CRACK if the node is cracked
// TileSpec should be passed as reference due to the underlying TileFrame and its vector
// TileFrame vector copy cost very much to client
void getNodeTileN(MapNode mn, const v3s16 &p, u8 tileindex, MeshMakeData *data, TileSpec &tile);
void getNodeTile(MapNode mn, const v3s16 &p, const v3s16 &dir, MeshMakeData *data, TileSpec &tile);