src/tile.h

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #ifndef TILE_HEADER
  21 #define TILE_HEADER
  22
  23 #include "common_irrlicht.h"
  24 #include "threads.h"
  25 #include "utility.h"
  26 #include <string>
  27
  28 class IGameDef;
  29
  30 /*
  31         tile.{h,cpp}: Texture handling stuff.
  32 */
  33
  34 /*
  35         Gets the path to a texture by first checking if the texture exists
  36         in texture_path and if not, using the data path.
  37
  38         Checks all supported extensions by replacing the original extension.
  39
  40         If not found, returns "".
  41
  42         Utilizes a thread-safe cache.
  43 */
  44 std::string getTexturePath(const std::string &filename);
  45
  46 /*
  47         Specifies a texture in an atlas.
  48
  49         This is used to specify single textures also.
  50
  51         This has been designed to be small enough to be thrown around a lot.
  52 */
  53 struct AtlasPointer
  54 {
  55         u32 id; // Texture id
  56         video::ITexture *atlas; // Atlas in where the texture is
  57         v2f pos; // Position in atlas
  58         v2f size; // Size in atlas
  59         u16 tiled; // X-wise tiling count. If 0, width of atlas is width of image.
  60
  61         AtlasPointer(
  62                         u16 id_,
  63                         video::ITexture *atlas_=NULL,
  64                         v2f pos_=v2f(0,0),
  65                         v2f size_=v2f(1,1),
  66                         u16 tiled_=1
  67                 ):
  68                 id(id_),
  69                 atlas(atlas_),
  70                 pos(pos_),
  71                 size(size_),
  72                 tiled(tiled_)
  73         {
  74         }
  75
  76         bool operator==(const AtlasPointer &other)
  77         {
  78                 return (
  79                         id == other.id
  80                 );
  81                 /*return (
  82                         id == other.id &&
  83                         atlas == other.atlas &&
  84                         pos == other.pos &&
  85                         size == other.size &&
  86                         tiled == other.tiled
  87                 );*/
  88         }
  89
  90         float x0(){ return pos.X; }
  91         float x1(){ return pos.X + size.X; }
  92         float y0(){ return pos.Y; }
  93         float y1(){ return pos.Y + size.Y; }
  94 };
  95
  96 /*
  97         An internal variant of the former with more data.
  98 */
  99 struct SourceAtlasPointer
 100 {
 101         std::string name;
 102         AtlasPointer a;
 103         video::IImage *atlas_img; // The source image of the atlas
 104         // Integer variants of position and size
 105         v2s32 intpos;
 106         v2u32 intsize;
 107
 108         SourceAtlasPointer(
 109                         const std::string &name_,
 110                         AtlasPointer a_=AtlasPointer(0, NULL),
 111                         video::IImage *atlas_img_=NULL,
 112                         v2s32 intpos_=v2s32(0,0),
 113                         v2u32 intsize_=v2u32(0,0)
 114                 ):
 115                 name(name_),
 116                 a(a_),
 117                 atlas_img(atlas_img_),
 118                 intpos(intpos_),
 119                 intsize(intsize_)
 120         {
 121         }
 122 };
 123
 124 /*
 125         TextureSource creates and caches textures.
 126 */
 127
 128 class ITextureSource
 129 {
 130 public:
 131         ITextureSource(){}
 132         virtual ~ITextureSource(){}
 133         virtual u32 getTextureId(const std::string &name){return 0;}
 134         virtual u32 getTextureIdDirect(const std::string &name){return 0;}
 135         virtual std::string getTextureName(u32 id){return "";}
 136         virtual AtlasPointer getTexture(u32 id){return AtlasPointer(0);}
 137         virtual AtlasPointer getTexture(const std::string &name)
 138                 {return AtlasPointer(0);}
 139         virtual video::ITexture* getTextureRaw(const std::string &name)
 140                 {return NULL;}
 141 };
 142
 143 class IWritableTextureSource : public ITextureSource
 144 {
 145 public:
 146         IWritableTextureSource(){}
 147         virtual ~IWritableTextureSource(){}
 148         virtual u32 getTextureId(const std::string &name){return 0;}
 149         virtual u32 getTextureIdDirect(const std::string &name){return 0;}
 150         virtual std::string getTextureName(u32 id){return "";}
 151         virtual AtlasPointer getTexture(u32 id){return AtlasPointer(0);}
 152         virtual AtlasPointer getTexture(const std::string &name)
 153                 {return AtlasPointer(0);}
 154         virtual video::ITexture* getTextureRaw(const std::string &name)
 155                 {return NULL;}
 156
 157         virtual void updateAP(AtlasPointer &ap)=0;
 158         virtual void buildMainAtlas(class IGameDef *gamedef)=0;
 159         virtual void processQueue()=0;
 160 };
 161
 162 IWritableTextureSource* createTextureSource(IrrlichtDevice *device);
 163
 164 enum MaterialType{
 165         MATERIAL_ALPHA_NONE,
 166         MATERIAL_ALPHA_VERTEX,
 167         MATERIAL_ALPHA_SIMPLE, // >127 = opaque
 168         MATERIAL_ALPHA_BLEND,
 169 };
 170
 171 // Material flags
 172 #define MATERIAL_FLAG_BACKFACE_CULLING 0x01
 173
 174 /*
 175         This fully defines the looks of a tile.
 176         The SMaterial of a tile is constructed according to this.
 177 */
 178 struct TileSpec
 179 {
 180         TileSpec():
 181                 texture(0),
 182                 alpha(255),
 183                 //material_type(MATERIAL_ALPHA_NONE),
 184                 // Use this so that leaves don't need a separate material
 185                 material_type(MATERIAL_ALPHA_SIMPLE),
 186                 material_flags(
 187                         //0 // <- DEBUG, Use the one below
 188                         MATERIAL_FLAG_BACKFACE_CULLING
 189                 )
 190         {
 191         }
 192
 193         bool operator==(TileSpec &other)
 194         {
 195                 return (
 196                         texture == other.texture &&
 197                         alpha == other.alpha &&
 198                         material_type == other.material_type &&
 199                         material_flags == other.material_flags
 200                 );
 201         }
 202
 203         // Sets everything else except the texture in the material
 204         void applyMaterialOptions(video::SMaterial &material) const
 205         {
 206                 if(alpha != 255 && material_type != MATERIAL_ALPHA_VERTEX)
 207                         dstream<<"WARNING: TileSpec: alpha != 255 "
 208                                         "but not MATERIAL_ALPHA_VERTEX"
 209                                         <<std::endl;
 210
 211                 if(material_type == MATERIAL_ALPHA_NONE)
 212                         material.MaterialType = video::EMT_SOLID;
 213                 else if(material_type == MATERIAL_ALPHA_VERTEX)
 214                         material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
 215                 else if(material_type == MATERIAL_ALPHA_SIMPLE)
 216                         material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
 217                 else if(material_type == MATERIAL_ALPHA_BLEND)
 218                         material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 219
 220                 material.BackfaceCulling = (material_flags & MATERIAL_FLAG_BACKFACE_CULLING) ? true : false;
 221         }
 222
 223         // NOTE: Deprecated, i guess?
 224         void setTexturePos(u8 tx_, u8 ty_, u8 tw_, u8 th_)
 225         {
 226                 texture.pos = v2f((float)tx_/256.0, (float)ty_/256.0);
 227                 texture.size = v2f(((float)tw_ + 1.0)/256.0, ((float)th_ + 1.0)/256.0);
 228         }
 229
 230         AtlasPointer texture;
 231         // Vertex alpha
 232         u8 alpha;
 233         // Material type
 234         u8 material_type;
 235         // Material flags
 236         u8 material_flags;
 237 };
 238
 239 #endif