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blockimages.h
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blockimages.h
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// Copyright 2010, 2011 Michael J. Nelson
//
// This file is part of pigmap.
//
// pigmap is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// pigmap 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with pigmap. If not, see <http://www.gnu.org/licenses/>.
#ifndef BLOCKIMAGES_H
#define BLOCKIMAGES_H
#include <stdint.h>
#include "rgba.h"
// this structure holds the block images used to build the map; each block image is a hexagonal shape within
// a 4Bx4B rectangle, with the unused area around it set to fully transparent
//
// example of hexagon shape for B = 3, where U represents pixels belonging to the U-facing side of the block, etc.:
//
// UU
// UUUUUU
// UUUUUUUUUU
// NUUUUUUUUUUW
// NNNUUUUUUWWW
// NNNNNUUWWWWW
// NNNNNNWWWWWW
// NNNNNNWWWWWW
// NNNNNNWWWWWW
// NNNNNWWWWW
// NNNWWW
// NW
//
// when supplying your own block images, there's nothing to stop you from going "out of bounds" and having
// non-transparent pixels outside the hexagon, but you'll just get a messed-up image, since the renderer
// uses only the hexagon to determine visibility, etc.
//
// note that translucent blocks require the most work to render, simply because you can see what's behind them;
// if every block in the world was translucent, for example, then every block would be considered visible
// ...so if you're editing the block images for special purposes like X-ray vision, the fastest results are
// obtained by making unwanted blocks fully transparent, not just translucent
// ...also, any pixels in the block images with alphas < 10 will have their alphas set to 0, and similarly
// any alphas > 245 will be set to 255; this is to prevent massive slowdown from accidental image-editing
// cock-ups, like somehow setting the transparency of the whole image to 99% instead of 100%, etc.
//
// most block images are created by resizing the relevant terrain.png images from 16x16 to 2Bx2B, then painting
// their columns onto the faces of the block image thusly (example is for B = 3 again):
//
// a f
// abcdef ab abc def
// abcdef aabbcd abcde bcdef
// abcdef ---> aabbccddef or abcdef or abcdef
// abcdef abccddeeff abcdef abcdef
// abcdef cdeeff abcdef abcdef
// abcdef ef bcdef abcde
// def abc
// f a
struct BlockImages
{
// this image holds all the block images, in rows of 16 (so its width is 4B*16; height depends on number of rows)
// ...the very first block image is a dummy one, fully transparent, for use with unrecognized blocks
RGBAImage img;
int rectsize; // size of block image bounding boxes
// for every possible 8-bit block id/4-bit block data combination, this holds the offset into the image
// (unrecognized id/data values are pointed at the dummy block image)
// this doesn't handle some things like fences and double chests where the rendering doesn't depend solely
// on the blockID/blockData; for those, the renderer just has to know the proper offsets on its own
int blockOffsets[256 * 16];
int getOffset(uint8_t blockID, uint8_t blockData) const {return blockOffsets[blockID * 16 + blockData];}
// check whether a block image is opaque (this is a function of the block images computed from the terrain,
// not of the actual block data; if a block image has 100% alpha everywhere, it's considered opaque)
std::vector<bool> opacity; // size is NUMBLOCKIMAGES; indexed by offset
bool isOpaque(int offset) const {return opacity[offset];}
bool isOpaque(uint8_t blockID, uint8_t blockData) const {return opacity[getOffset(blockID, blockData)];}
// ...and the same thing for complete transparency (0% alpha everywhere)
std::vector<bool> transparency; // size is NUMBLOCKIMAGES; indexed by offset
bool isTransparent(int offset) const {return transparency[offset];}
bool isTransparent(uint8_t blockID, uint8_t blockData) const {return transparency[getOffset(blockID, blockData)];}
// get the rectangle in img corresponding to an offset
ImageRect getRect(int offset) const {return ImageRect((offset%16)*rectsize, (offset/16)*rectsize, rectsize, rectsize);}
ImageRect getRect(uint8_t blockID, uint8_t blockData) const {return getRect(getOffset(blockID, blockData));}
// attempt to create a BlockImages structure: look for blocks-B.png in the imgpath, where B is the block size
// parameter; failing that, look for terrain.png and construct a new blocks-B.png from it; failing that, uh, fail
bool create(int B, const std::string& imgpath);
// set the offsets
void setOffsets();
// fill in the opacity and transparency members
void checkOpacityAndTransparency(int B);
// scan the block images looking for not-quite-transparent or not-quite-opaque pixels; if they're close enough,
// push them all the way
void retouchAlphas(int B);
// build block images from terrain.png
bool construct(int B, const std::string& terrainfile, const std::string& firefile);
};
#define NUMBLOCKIMAGES 273
// block image offsets:
//
// 0 dummy/air (transparent) 32 brown mushroom 64 wheat level 2 96 cobble stairs asc S
// 1 stone 33 red mushroom 65 wheat level 1 97 cobble stairs asc N
// 2 grass 34 gold block 66 wheat level 0 98 cobble stairs asc W
// 3 dirt 35 iron block 67 farmland 99 cobble stairs asc E
// 4 cobblestone 36 double stone slab 68 UNUSED 100 wall sign facing E
// 5 planks 37 stone slab 69 UNUSED 101 wall sign facing W
// 6 sapling 38 brick 70 sign facing N/S 102 wall sign facing N
// 7 bedrock 39 TNT 71 sign facing NE/SW 103 wall sign facing S
// 8 water full/falling 40 bookshelf 72 sign facing E/W 104 UNUSED
// 9 water level 7 41 mossy cobblestone 73 sign facing SE/NW 105 UNUSED
// 10 water level 6 42 obsidian 74 wood door S side 106 UNUSED
// 11 water level 5 43 torch floor 75 wood door N side 107 UNUSED
// 12 water level 4 44 torch pointing S 76 wood door W side 108 UNUSED
// 13 water level 3 45 torch pointing N 77 wood door E side 109 UNUSED
// 14 water level 2 46 torch pointing W 78 wood door top S 110 stone pressure plate
// 15 water level 1 47 torch pointing E 79 wood door top N 111 iron door S side
// 16 lava full/falling 48 UNUSED 80 wood door top W 112 iron door N side
// 17 lava level 3 49 spawner 81 wood door top E 113 iron door W side
// 18 lava level 2 50 wood stairs asc S 82 ladder E side 114 iron door E side
// 19 lava level 1 51 wood stairs asc N 83 ladder W side 115 iron door top S
// 20 sand 52 wood stairs asc W 84 ladder N side 116 iron door top N
// 21 gravel 53 wood stairs asc E 85 ladder S side 117 iron door top W
// 22 gold ore 54 chest facing W 86 track EW 118 iron door top E
// 23 iron ore 55 redstone wire NSEW 87 track NS 119 wood pressure plate
// 24 coal ore 56 diamond ore 88 UNUSED 120 redstone ore
// 25 log 57 diamond block 89 UNUSED 121 red torch floor off
// 26 leaves 58 workbench 90 UNUSED 122 red torch floor on
// 27 sponge 59 wheat level 7 91 UNUSED 123 UNUSED
// 28 glass 60 wheat level 6 92 track NE corner 124 UNUSED
// 29 white wool 61 wheat level 5 93 track SE corner 125 UNUSED
// 30 yellow flower 62 wheat level 4 94 track SW corner 126 UNUSED
// 31 red rose 63 wheat level 3 95 track NW corner 127 snow
//
// 128 ice 160 fence NS 192 stone button facing W 224 dispenser N
// 129 snow block 161 fence E 193 stone button facing E 225 dispenser E/S
// 130 cactus 162 fence NE 194 wall lever facing S 226 sandstone
// 131 clay 163 fence SE 195 wall lever facing N 227 note block
// 132 reeds 164 fence NSE 196 wall lever facing W 228 cake
// 133 jukebox 165 fence W 197 wall lever facing E 229 sandstone slab
// 134 fence post 166 fence NW 198 ground lever EW 230 wooden slab
// 135 pumpkin facing W 167 fence SW 199 ground lever NS 231 cobble slab
// 136 netherrack 168 fence NSW 200 track asc S 232 bed head W
// 137 soul sand 169 fence EW 201 track asc N 233 bed head N
// 138 glowstone 170 fence NEW 202 track asc E 234 bed head E
// 139 portal 171 fence SEW 203 track asc W 235 bed head S
// 140 jack-o-lantern W 172 fence NSEW 204 orange wool 236 bed foot W
// 141 red torch S on 173 double chest N 205 magenta wool 237 bed foot N
// 142 red torch N on 174 double chest S 206 light blue wool 238 bed foot E
// 143 red torch E on 175 double chest E 207 yellow wool 239 bed foot S
// 144 red torch W on 176 double chest W 208 lime wool 240 repeater on N
// 145 red torch S off 177 chest facing N 209 pink wool 241 repeater on S
// 146 red torch N off 178 water missing W 210 gray wool 242 repeater on E
// 147 red torch E off 179 water missing N 211 light gray wool 243 repeater on W
// 148 red torch W off 180 ice surface 212 cyan wool 244 repeater off N
// 149 UNUSED 181 ice missing W 213 purple wool 245 repeater off S
// 150 UNUSED 182 ice missing N 214 blue wool 246 repeater off E
// 151 UNUSED 183 furnace W 215 brown wool 247 repeater off W
// 152 UNUSED 184 furnace N 216 green wool 248 pine leaves
// 153 pumpkin facing E/S 185 furnace E/S 217 red wool 249 birch leaves
// 154 pumpkin facing N 186 lit furnace W 218 black wool 250 pine sapling
// 155 jack-o-lantern E/S 187 lit furnace N 219 pine log 251 birch sapling
// 156 jack-o-lantern N 188 lit furnace E/S 220 birch log 252 booster on EW
// 157 water surface 189 fire 221 lapis ore 253 booster on NS
// 158 fence N 190 stone button facing S 222 lapis block 254 booster on asc S
// 159 fence S 191 stone button facing N 223 dispenser W 255 booster on asc N
//
// 256 booster on asc E
// 257 booster on asc W
// 258 booster off EW
// 259 booster off NS
// 260 booster off asc S
// 261 booster off asc N
// 262 booster off asc E
// 263 booster off asc W
// 264 detector EW
// 265 detector NS
// 266 detector asc S
// 267 detector asc N
// 268 detector asc E
// 269 detector asc W
// 270 locked chest facing W
// 271 locked chest facing N
// 272 web
#endif // BLOCKIMAGES_H