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1/*
2* Copyright (c) Contributors, http://www.openmetaverse.org/
3* See CONTRIBUTORS.TXT for a full list of copyright holders.
4*
5* Redistribution and use in source and binary forms, with or without
6* modification, are permitted provided that the following conditions are met:
7* * Redistributions of source code must retain the above copyright
8* notice, this list of conditions and the following disclaimer.
9* * Redistributions in binary form must reproduce the above copyright
10* notice, this list of conditions and the following disclaimer in the
11* documentation and/or other materials provided with the distribution.
12* * Neither the name of the OpenSim Project nor the
13* names of its contributors may be used to endorse or promote products
14* derived from this software without specific prior written permission.
15*
16* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS AND ANY
17* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
20* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26*
27*/
28using System;
29using System.Collections.Generic;
30using System.Text;
31using System.Drawing;
32using libTerrain;
33
34namespace OpenSim.Terrain
35{
36 public class TerrainEngine
37 {
38 /// <summary>
39 /// A [normally] 256x256 heightmap
40 /// </summary>
41 public Channel heightmap;
42
43 /// <summary>
44 /// Whether or not the terrain has been modified since it was last saved and sent to the Physics engine.
45 /// Counts the number of modifications since the last save. (0 = Untainted)
46 /// </summary>
47 public int tainted;
48
49 int w, h;
50
51 /// <summary>
52 /// Generate a new TerrainEngine instance and creates a new heightmap
53 /// </summary>
54 public TerrainEngine()
55 {
56 w = 256;
57 h = 256;
58 heightmap = new Channel(w, h);
59
60 tainted++;
61 }
62
63 /// <summary>
64 /// Converts the heightmap to a 65536 value 1D floating point array
65 /// </summary>
66 /// <returns>A float[65536] array containing the heightmap</returns>
67 public float[] getHeights1D()
68 {
69 float[] heights = new float[w * h];
70 int i;
71
72 for (i = 0; i < w * h; i++)
73 {
74 heights[i] = (float)heightmap.map[i / w, i % w];
75 }
76
77 return heights;
78 }
79
80 /// <summary>
81 /// Converts the heightmap to a 256x256 value 2D floating point array.
82 /// </summary>
83 /// <returns>An array of 256,256 values containing the heightmap</returns>
84 public float[,] getHeights2D()
85 {
86 float[,] heights = new float[w, h];
87 int x, y;
88 for (x = 0; x < w; x++)
89 {
90 for (y = 0; y < h; y++)
91 {
92 heights[x, y] = (float)heightmap.map[x, y];
93 }
94 }
95 return heights;
96 }
97
98 /// <summary>
99 /// Imports a 1D floating point array into the 2D heightmap array
100 /// </summary>
101 /// <param name="heights">The array to import (must have 65536 members)</param>
102 public void setHeights1D(float[] heights)
103 {
104 int i;
105 for (i = 0; i < w * h; i++)
106 {
107 heightmap.map[i / w, i % w] = heights[i];
108 }
109
110 tainted++;
111 }
112
113 /// <summary>
114 /// Loads a 2D array of values into the heightmap
115 /// </summary>
116 /// <param name="heights">An array of 256,256 float values</param>
117 public void setHeights2D(float[,] heights)
118 {
119 int x, y;
120 for (x = 0; x < w; x++)
121 {
122 for (y = 0; y < h; y++)
123 {
124 heightmap.set(x, y, (double)heights[x, y]);
125 }
126 }
127 tainted++;
128 }
129
130 /// <summary>
131 /// Processes a terrain-specific command
132 /// </summary>
133 /// <param name="args">Commandline arguments (space seperated)</param>
134 /// <param name="resultText">Reference that returns error or help text if returning false</param>
135 /// <returns>If the operation was successful (if not, the error is placed into resultText)</returns>
136 public bool RunTerrainCmd(string[] args, ref string resultText)
137 {
138 string command = args[0];
139
140 try
141 {
142
143 switch (command)
144 {
145 case "help":
146 resultText += "terrain regenerate - rebuilds the sims terrain using a default algorithm\n";
147 resultText += "terrain seed <seed> - sets the random seed value to <seed>\n";
148 resultText += "terrain load <type> <filename> - loads a terrain from disk, type can be 'F32', 'F64', 'RAW' or 'IMG'\n";
149 resultText += "terrain save <type> <filename> - saves a terrain to disk, type can be 'F32' or 'F64'\n";
150 resultText += "terrain save grdmap <filename> <gradient map> - creates a PNG snapshot of the region using a named gradient map\n";
151 resultText += "terrain rescale <min> <max> - rescales a terrain to be between <min> and <max> meters high\n";
152 resultText += "terrain erode aerobic <windspeed> <pickupmin> <dropmin> <carry> <rounds> <lowest>\n";
153 resultText += "terrain erode thermal <talus> <rounds> <carry>\n";
154 resultText += "terrain multiply <val> - multiplies a terrain by <val>\n";
155 return false;
156
157 case "seed":
158 setSeed(Convert.ToInt32(args[1]));
159 break;
160
161 case "erode":
162 switch (args[1].ToLower())
163 {
164 case "aerobic":
165 // WindSpeed, PickupMinimum,DropMinimum,Carry,Rounds,Lowest
166 heightmap.AerobicErosion(Convert.ToDouble(args[2]), Convert.ToDouble(args[3]), Convert.ToDouble(args[4]), Convert.ToDouble(args[5]), Convert.ToInt32(args[6]), Convert.ToBoolean(args[7]));
167 break;
168 case "thermal":
169 heightmap.thermalWeathering(Convert.ToDouble(args[2]), Convert.ToInt32(args[3]), Convert.ToDouble(args[4]));
170 break;
171 default:
172 resultText = "Unknown erosion type";
173 return false;
174 }
175 break;
176
177 case "regenerate":
178 hills();
179 break;
180
181 case "rescale":
182 setRange(Convert.ToSingle(args[1]), Convert.ToSingle(args[2]));
183 break;
184
185 case "multiply":
186 heightmap *= Convert.ToDouble(args[1]);
187 break;
188
189 case "load":
190 switch (args[1].ToLower())
191 {
192 case "f32":
193 loadFromFileF32(args[2]);
194 break;
195
196 case "f64":
197 loadFromFileF64(args[2]);
198 break;
199
200 case "raw":
201 loadFromFileSLRAW(args[2]);
202 break;
203
204 case "img":
205 loadFromFileIMG(args[2]);
206 return false;
207
208 default:
209 resultText = "Unknown image or data format";
210 return false;
211 }
212 break;
213
214 case "save":
215 switch (args[1].ToLower())
216 {
217 case "f32":
218 writeToFileF32(args[2]);
219 break;
220
221 case "f64":
222 writeToFileF64(args[2]);
223 break;
224
225 case "grdmap":
226 exportImage(args[2], args[3]);
227 break;
228
229 default:
230 resultText = "Unknown image or data format";
231 return false;
232 }
233 break;
234
235 default:
236 resultText = "Unknown terrain command";
237 return false;
238 }
239 return true;
240 }
241 catch (Exception e)
242 {
243 resultText = "Error running terrain command: " + e.ToString();
244 return false;
245 }
246 }
247
248 /// <summary>
249 /// Renormalises the array between min and max
250 /// </summary>
251 /// <param name="min">Minimum value of the new array</param>
252 /// <param name="max">Maximum value of the new array</param>
253 public void setRange(float min, float max)
254 {
255 heightmap.normalise((double)min, (double)max);
256 tainted++;
257 }
258
259 /// <summary>
260 /// Loads a file from an image compatible with System.Drawing
261 /// </summary>
262 /// <param name="filename">File to load</param>
263 public void loadFromFileIMG(string filename)
264 {
265 System.Drawing.Bitmap bmp = new Bitmap(filename);
266
267 if (bmp.Width != heightmap.w && bmp.Height != heightmap.h)
268 throw new Exception("Wrong image size! Images for this region must be " + heightmap.w.ToString() + " by " + heightmap.h.ToString() + " pixels in dimension");
269
270 int x, y;
271
272 for (x = 0; x < w; x++)
273 {
274 for (y = 0; y < h; y++)
275 {
276 Color c = bmp.GetPixel(x, y);
277 }
278 }
279 }
280
281 /// <summary>
282 /// Loads a file consisting of 256x256 doubles and imports it as an array into the map.
283 /// </summary>
284 /// <remarks>TODO: Move this to libTerrain itself</remarks>
285 /// <param name="filename">The filename of the double array to import</param>
286 public void loadFromFileF64(string filename)
287 {
288 System.IO.FileInfo file = new System.IO.FileInfo(filename);
289 System.IO.FileStream s = file.Open(System.IO.FileMode.Open, System.IO.FileAccess.Read);
290 System.IO.BinaryReader bs = new System.IO.BinaryReader(s);
291 int x, y;
292 for (x = 0; x < w; x++)
293 {
294 for (y = 0; y < h; y++)
295 {
296 heightmap.map[x, y] = bs.ReadDouble();
297 }
298 }
299
300 bs.Close();
301 s.Close();
302
303 tainted++;
304 }
305
306 /// <summary>
307 /// Loads a file consisting of 256x256 floats and imports it as an array into the map.
308 /// </summary>
309 /// <remarks>TODO: Move this to libTerrain itself</remarks>
310 /// <param name="filename">The filename of the float array to import</param>
311 public void loadFromFileF32(string filename)
312 {
313 System.IO.FileInfo file = new System.IO.FileInfo(filename);
314 System.IO.FileStream s = file.Open(System.IO.FileMode.Open, System.IO.FileAccess.Read);
315 System.IO.BinaryReader bs = new System.IO.BinaryReader(s);
316 int x, y;
317 for (x = 0; x < w; x++)
318 {
319 for (y = 0; y < h; y++)
320 {
321 heightmap.map[x, y] = (double)bs.ReadSingle();
322 }
323 }
324
325 bs.Close();
326 s.Close();
327
328 tainted++;
329 }
330
331 /// <summary>
332 /// Loads a file formatted in the SL .RAW Format used on the main grid
333 /// </summary>
334 /// <remarks>This file format stinks and is best avoided.</remarks>
335 /// <param name="filename">A path to the .RAW format</param>
336 public void loadFromFileSLRAW(string filename)
337 {
338 System.IO.FileInfo file = new System.IO.FileInfo(filename);
339 System.IO.FileStream s = file.Open(System.IO.FileMode.Open, System.IO.FileAccess.Read);
340 System.IO.BinaryReader bs = new System.IO.BinaryReader(s);
341 int x, y;
342 for (x = 0; x < w; x++)
343 {
344 for (y = 0; y < h; y++)
345 {
346 heightmap.map[x, y] = (double)bs.ReadByte() * ((double)bs.ReadByte() / 127.0);
347 bs.ReadBytes(11); // Advance the stream to next bytes.
348 }
349 }
350
351 bs.Close();
352 s.Close();
353
354 tainted++;
355 }
356
357 /// <summary>
358 /// Writes the current terrain heightmap to disk, in the format of a 65536 entry double[] array.
359 /// </summary>
360 /// <param name="filename">The desired output filename</param>
361 public void writeToFileF64(string filename)
362 {
363 System.IO.FileInfo file = new System.IO.FileInfo(filename);
364 System.IO.FileStream s = file.Open(System.IO.FileMode.CreateNew, System.IO.FileAccess.Write);
365 System.IO.BinaryWriter bs = new System.IO.BinaryWriter(s);
366
367 int x, y;
368 for (x = 0; x < w; x++)
369 {
370 for (y = 0; y < h; y++)
371 {
372 bs.Write(heightmap.get(x, y));
373 }
374 }
375
376 bs.Close();
377 s.Close();
378 }
379
380 /// <summary>
381 /// Writes the current terrain heightmap to disk, in the format of a 65536 entry float[] array
382 /// </summary>
383 /// <param name="filename">The desired output filename</param>
384 public void writeToFileF32(string filename)
385 {
386 System.IO.FileInfo file = new System.IO.FileInfo(filename);
387 System.IO.FileStream s = file.Open(System.IO.FileMode.CreateNew, System.IO.FileAccess.Write);
388 System.IO.BinaryWriter bs = new System.IO.BinaryWriter(s);
389
390 int x, y;
391 for (x = 0; x < w; x++)
392 {
393 for (y = 0; y < h; y++)
394 {
395 bs.Write((float)heightmap.get(x, y));
396 }
397 }
398
399 bs.Close();
400 s.Close();
401 }
402
403 /// <summary>
404 /// Sets the random seed to be used by procedural functions which involve random numbers.
405 /// </summary>
406 /// <param name="val">The desired seed</param>
407 public void setSeed(int val)
408 {
409 heightmap.seed = val;
410 }
411
412 /// <summary>
413 /// Raises land in a sphere around the specified coordinates
414 /// </summary>
415 /// <param name="rx">Center of the sphere on the X axis</param>
416 /// <param name="ry">Center of the sphere on the Y axis</param>
417 /// <param name="size">The radius of the sphere</param>
418 /// <param name="amount">Scale the height of the sphere by this amount (recommended 0..2)</param>
419 public void raise(double rx, double ry, double size, double amount)
420 {
421 lock (heightmap)
422 {
423 heightmap.raise(rx, ry, size, amount);
424 }
425
426 tainted++;
427 }
428
429 /// <summary>
430 /// Lowers the land in a sphere around the specified coordinates
431 /// </summary>
432 /// <param name="rx">The center of the sphere at the X axis</param>
433 /// <param name="ry">The center of the sphere at the Y axis</param>
434 /// <param name="size">The radius of the sphere in meters</param>
435 /// <param name="amount">Scale the height of the sphere by this amount (recommended 0..2)</param>
436 public void lower(double rx, double ry, double size, double amount)
437 {
438 lock (heightmap)
439 {
440 heightmap.lower(rx, ry, size, amount);
441 }
442
443 tainted++;
444 }
445
446 /// <summary>
447 /// Generates a simple set of hills in the shape of an island
448 /// </summary>
449 public void hills()
450 {
451 lock (heightmap)
452 {
453 heightmap.hillsSpheres(200, 20, 40, true, true, false);
454 heightmap.normalise();
455 heightmap *= 60.0; // Raise to 60m
456 }
457
458 tainted++;
459 }
460
461 /// <summary>
462 /// Multiplies the heightfield by val
463 /// </summary>
464 /// <param name="meep">The heightfield</param>
465 /// <param name="val">The multiplier</param>
466 /// <returns></returns>
467 public static TerrainEngine operator *(TerrainEngine meep, Double val)
468 {
469 meep.heightmap *= val;
470 meep.tainted++;
471 return meep;
472 }
473
474 /// <summary>
475 /// Returns the height at the coordinates x,y
476 /// </summary>
477 /// <param name="x">X Coordinate</param>
478 /// <param name="y">Y Coordinate</param>
479 /// <returns></returns>
480 public float this[int x, int y]
481 {
482 get
483 {
484 return (float)heightmap.get(x, y);
485 }
486 set
487 {
488 tainted++;
489 heightmap.set(x, y, (double)value);
490 }
491 }
492
493 /// <summary>
494 /// Exports the current heightmap to a PNG file
495 /// </summary>
496 /// <param name="filename">The destination filename for the image</param>
497 /// <param name="gradientmap">A 1x*height* image which contains the colour gradient to export with. Must be at least 1x2 pixels, 1x256 or more is ideal.</param>
498 public void exportImage(string filename, string gradientmap)
499 {
500 try
501 {
502 Bitmap gradientmapLd = new Bitmap(gradientmap);
503
504 int pallete = gradientmapLd.Height;
505
506 Bitmap bmp = new Bitmap(heightmap.w, heightmap.h);
507 Color[] colours = new Color[pallete];
508
509 for (int i = 0; i < pallete; i++)
510 {
511 colours[i] = gradientmapLd.GetPixel(0, i);
512 }
513
514 Channel copy = heightmap.copy();
515 for (int x = 0; x < copy.w; x++)
516 {
517 for (int y = 0; y < copy.h; y++)
518 {
519 // 512 is the largest possible height before colours clamp
520 int colorindex = (int)(Math.Max(Math.Min(1.0, copy.get(x, y) / 512.0), 0.0) * pallete);
521 bmp.SetPixel(y, 255 - x, colours[colorindex]);
522 }
523 }
524
525 bmp.Save(filename, System.Drawing.Imaging.ImageFormat.Png);
526 }
527 catch (Exception e)
528 {
529 Console.WriteLine("Failed generating terrain map: " + e.ToString());
530 }
531 }
532 }
533} \ No newline at end of file
generated by cgit v1.1 at 2024-07-16 19:24:01 +0000