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authorUbitUmarov2015-09-25 17:41:50 +0100
committerUbitUmarov2015-09-25 17:41:50 +0100
commite6f675b81b73804b625efd2bdc98a9841a607729 (patch)
treea656e8a6cb86b95c6d3cf27f7e57706cf41531ff
parent add butterflies to terrain (diff)
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rearrange source code
Diffstat
-rw-r--r--OpenSim/Region/Framework/Scenes/TerrainCompressor.cs617
1 files changed, 304 insertions, 313 deletions
diff --git a/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs b/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs
index 32fd263..e744202 100644
--- a/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs
+++ b/OpenSim/Region/Framework/Scenes/TerrainCompressor.cs
@@ -65,7 +65,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
65 private const int NEGATIVE_VALUE = 0x7; 65 private const int NEGATIVE_VALUE = 0x7;
66 66
67 67
68 private static readonly float[] CosineTable16 = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize]; 68// private static readonly float[] CosineTable16 = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
69 private static readonly int[] CopyMatrix16 = new int[Constants.TerrainPatchSize * Constants.TerrainPatchSize]; 69 private static readonly int[] CopyMatrix16 = new int[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
70 70
71 private static readonly float[] QuantizeTable16 = 71 private static readonly float[] QuantizeTable16 =
@@ -77,7 +77,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
77 { 77 {
78 // Initialize the decompression tables 78 // Initialize the decompression tables
79 BuildDequantizeTable16(); 79 BuildDequantizeTable16();
80 SetupCosines16(); 80// SetupCosines16();
81 BuildCopyMatrix16(); 81 BuildCopyMatrix16();
82 BuildQuantizeTable16(); 82 BuildQuantizeTable16();
83 } 83 }
@@ -140,6 +140,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
140 140
141 return header; 141 return header;
142 } 142 }
143
143 private static int[] CompressPatch(float[] patchData, TerrainPatch.Header header, int prequant, out int wbits) 144 private static int[] CompressPatch(float[] patchData, TerrainPatch.Header header, int prequant, out int wbits)
144 { 145 {
145 float[] block = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize]; 146 float[] block = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
@@ -189,7 +190,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
189 190
190 for (int i = 0; i < x.Length; i++) 191 for (int i = 0; i < x.Length; i++)
191 { 192 {
192 CreatePatchFromHeightmap(bitpack, terrData, x[i], y[i]); 193 CreatePatchFromTerrainData(bitpack, terrData, x[i], y[i]);
193 if (bitpack.BytePos > 1000 && i != x.Length - 1) 194 if (bitpack.BytePos > 1000 && i != x.Length - 1)
194 { 195 {
195 //finish this packet 196 //finish this packet
@@ -219,22 +220,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
219 return ret; 220 return ret;
220 } 221 }
221 222
222 /// <summary> 223 public static void CreatePatchFromTerrainData(BitPack output, TerrainData terrData, int patchX, int patchY)
223 /// Add a patch of terrain to a BitPacker
224 /// </summary>
225 /// <param name="output">BitPacker to write the patch to</param>
226 /// <param name="heightmap">
227 /// Heightmap of the simulator. Presumed to be an sizeX*sizeY array.
228 /// </param>
229 /// <param name="patchX">
230 /// X offset of the patch to create.
231 /// </param>
232 /// <param name="patchY">
233 /// Y offset of the patch to create.
234 /// </param>
235 /// <param name="pRegionSizeX"></param>
236 /// <param name="pRegionSizeY"></param>
237 public static void CreatePatchFromHeightmap(BitPack output, TerrainData terrData, int patchX, int patchY)
238 { 224 {
239 float frange; 225 float frange;
240 TerrainPatch.Header header = PrescanPatch(terrData, patchX, patchY, out frange); 226 TerrainPatch.Header header = PrescanPatch(terrData, patchX, patchY, out frange);
@@ -284,8 +270,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
284 private static TerrainPatch.Header PrescanPatch(TerrainData terrData, int patchX, int patchY, out float frange) 270 private static TerrainPatch.Header PrescanPatch(TerrainData terrData, int patchX, int patchY, out float frange)
285 { 271 {
286 TerrainPatch.Header header = new TerrainPatch.Header(); 272 TerrainPatch.Header header = new TerrainPatch.Header();
287 float zmax = -99999999.0f; 273 float zmax = float.MinValue;
288 float zmin = 99999999.0f; 274 float zmin = float.MaxValue;
275
289 int startx = patchX * Constants.TerrainPatchSize; 276 int startx = patchX * Constants.TerrainPatchSize;
290 int starty = patchY * Constants.TerrainPatchSize; 277 int starty = patchY * Constants.TerrainPatchSize;
291 278
@@ -306,29 +293,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
306 return header; 293 return header;
307 } 294 }
308 295
309 public static TerrainPatch.Header DecodePatchHeader(BitPack bitpack)
310 {
311 TerrainPatch.Header header = new TerrainPatch.Header { QuantWBits = bitpack.UnpackBits(8) };
312
313 // Quantized word bits
314 if (header.QuantWBits == END_OF_PATCHES)
315 return header;
316
317 // DC offset
318 header.DCOffset = bitpack.UnpackFloat();
319
320 // Range
321 header.Range = bitpack.UnpackBits(16);
322
323 // Patch IDs (10 bits)
324 header.PatchIDs = bitpack.UnpackBits(10);
325
326 // Word bits
327 header.WordBits = (uint)((header.QuantWBits & 0x0f) + 2);
328
329 return header;
330 }
331
332 private static void EncodePatchHeader(BitPack output, TerrainPatch.Header header, int[] patch, bool largeRegion, ref int wbits) 296 private static void EncodePatchHeader(BitPack output, TerrainPatch.Header header, int[] patch, bool largeRegion, ref int wbits)
333 { 297 {
334 if (wbits > 17) 298 if (wbits > 17)
@@ -348,85 +312,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
348 output.PackBits(header.PatchIDs, 10); 312 output.PackBits(header.PatchIDs, 10);
349 } 313 }
350 314
351 private static void IDCTColumn16(float[] linein, float[] lineout, int column)
352 {
353 for (int n = 0; n < Constants.TerrainPatchSize; n++)
354 {
355 float total = OO_SQRT2 * linein[column];
356
357 for (int u = 1; u < Constants.TerrainPatchSize; u++)
358 {
359 int usize = u * Constants.TerrainPatchSize;
360 total += linein[usize + column] * CosineTable16[usize + n];
361 }
362
363 lineout[Constants.TerrainPatchSize * n + column] = total;
364 }
365 }
366
367 private static void IDCTLine16(float[] linein, float[] lineout, int line)
368 {
369 const float oosob = 2.0f / Constants.TerrainPatchSize;
370 int lineSize = line * Constants.TerrainPatchSize;
371
372 for (int n = 0; n < Constants.TerrainPatchSize; n++)
373 {
374 float total = OO_SQRT2 * linein[lineSize];
375
376 for (int u = 1; u < Constants.TerrainPatchSize; u++)
377 {
378 total += linein[lineSize + u] * CosineTable16[u * Constants.TerrainPatchSize + n];
379 }
380
381 lineout[lineSize + n] = total * oosob;
382 }
383 }
384
385 public static void DecodePatch(int[] patches, BitPack bitpack, TerrainPatch.Header header, int size)
386 {
387 for (int n = 0; n < size * size; n++)
388 {
389 // ?
390 int temp = bitpack.UnpackBits(1);
391 if (temp != 0)
392 {
393 // Value or EOB
394 temp = bitpack.UnpackBits(1);
395 if (temp != 0)
396 {
397 // Value
398 temp = bitpack.UnpackBits(1);
399 if (temp != 0)
400 {
401 // Negative
402 temp = bitpack.UnpackBits((int)header.WordBits);
403 patches[n] = temp * -1;
404 }
405 else
406 {
407 // Positive
408 temp = bitpack.UnpackBits((int)header.WordBits);
409 patches[n] = temp;
410 }
411 }
412 else
413 {
414 // Set the rest to zero
415 // TODO: This might not be necessary
416 for (int o = n; o < size * size; o++)
417 {
418 patches[o] = 0;
419 }
420 break;
421 }
422 }
423 else
424 {
425 patches[n] = 0;
426 }
427 }
428 }
429
430 private static void EncodePatch(BitPack output, int[] patch, int postquant, int wbits) 315 private static void EncodePatch(BitPack output, int[] patch, int postquant, int wbits)
431 { 316 {
432 int maxwbitssize = (1 << wbits) - 1; 317 int maxwbitssize = (1 << wbits) - 1;
@@ -493,6 +378,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
493 int prequant, out int wbits) 378 int prequant, out int wbits)
494 { 379 {
495 float[] block = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize]; 380 float[] block = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
381 int[] iout = new int[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
496 382
497 float oozrange = 1.0f / header.Range; 383 float oozrange = 1.0f / header.Range;
498 float invprequat = (1 << prequant); 384 float invprequat = (1 << prequant);
@@ -505,27 +391,16 @@ namespace OpenSim.Region.ClientStack.LindenUDP
505 header.QuantWBits |= wordsize << 4; 391 header.QuantWBits |= wordsize << 4;
506 392
507 int k = 0; 393 int k = 0;
508 394 int startX = patchX * Constants.TerrainPatchSize;
509 int yPatchLimit = patchY >= (terrData.SizeY / Constants.TerrainPatchSize) ? 395 int startY = patchY * Constants.TerrainPatchSize;
510 (terrData.SizeY - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchY; 396 for (int y = startY; y < startY + Constants.TerrainPatchSize; y++)
511 yPatchLimit = (yPatchLimit + 1) * Constants.TerrainPatchSize;
512
513 int xPatchLimit = patchX >= (terrData.SizeX / Constants.TerrainPatchSize) ?
514 (terrData.SizeX - Constants.TerrainPatchSize) / Constants.TerrainPatchSize : patchX;
515 xPatchLimit = (xPatchLimit + 1) * Constants.TerrainPatchSize;
516
517 for (int yy = patchY * Constants.TerrainPatchSize; yy < yPatchLimit; yy++)
518 { 397 {
519 for (int xx = patchX * Constants.TerrainPatchSize; xx < xPatchLimit; xx++) 398 for (int x = startX; x < startX + Constants.TerrainPatchSize; x++)
520 { 399 {
521 block[k++] = (terrData[xx, yy] - sub) * premult; 400 block[k++] = (terrData[x, y] - sub) * premult;
522 } 401 }
523 } 402 }
524 403
525
526 float[] ftemp = new float[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
527 int[] iout = new int[Constants.TerrainPatchSize * Constants.TerrainPatchSize];
528
529 wbits = (prequant >> 1); 404 wbits = (prequant >> 1);
530 405
531 dct16x16(block, iout, ref wbits); 406 dct16x16(block, iout, ref wbits);
@@ -558,19 +433,6 @@ namespace OpenSim.Region.ClientStack.LindenUDP
558 } 433 }
559 } 434 }
560 435
561 private static void SetupCosines16()
562 {
563 const float hposz = (float)Math.PI * 0.5f / Constants.TerrainPatchSize;
564
565 for (int u = 0; u < Constants.TerrainPatchSize; u++)
566 {
567 for (int n = 0; n < Constants.TerrainPatchSize; n++)
568 {
569 CosineTable16[u * Constants.TerrainPatchSize + n] = (float)Math.Cos((2.0f * n + 1.0f) * u * hposz);
570 }
571 }
572 }
573
574 private static void BuildCopyMatrix16() 436 private static void BuildCopyMatrix16()
575 { 437 {
576 bool diag = false; 438 bool diag = false;
@@ -622,7 +484,11 @@ namespace OpenSim.Region.ClientStack.LindenUDP
622 484
623 #endregion Initialization 485 #endregion Initialization
624 486
487
488
489
625 #region DCT 490 #region DCT
491
626 /* DCT (Discrete Cosine Transform) 492 /* DCT (Discrete Cosine Transform)
627 adaptation from 493 adaptation from
628 General Purpose 2D,3D FFT (Fast Fourier Transform) Package 494 General Purpose 2D,3D FFT (Fast Fourier Transform) Package
@@ -677,15 +543,14 @@ namespace OpenSim.Region.ClientStack.LindenUDP
677 float xr, xi; 543 float xr, xi;
678 float ftmp; 544 float ftmp;
679 545
546 int fullSize = Constants.TerrainPatchSize * Constants.TerrainPatchSize;
680 int itmp; 547 int itmp;
681 int j, k; 548 int j, k;
682 int indx; 549 int indx;
683 550
684 const int maxwbits = 17; // per header encoding 551 const int maxwbits = 17; // per header encoding
685 bool dowbits = wbits < 17;
686 int wbitsMaxValue = 1 << wbits; 552 int wbitsMaxValue = 1 << wbits;
687 553 bool dowbits = wbits < 17;
688 int fullSize = Constants.TerrainPatchSize * Constants.TerrainPatchSize;
689 554
690 for (j = 0, k = 0; j < fullSize; j += Constants.TerrainPatchSize, k++) 555 for (j = 0, k = 0; j < fullSize; j += Constants.TerrainPatchSize, k++)
691 { 556 {
@@ -1166,169 +1031,295 @@ namespace OpenSim.Region.ClientStack.LindenUDP
1166 } 1031 }
1167 } 1032 }
1168 1033
1169 /* not in use, and still not fixed 1034 #endregion DCT
1170 static void idct16x16(float[] a) 1035
1036 #region Decode
1037 /*
1038 public static TerrainPatch.Header DecodePatchHeader(BitPack bitpack)
1171 { 1039 {
1172 int j; 1040 TerrainPatch.Header header = new TerrainPatch.Header { QuantWBits = bitpack.UnpackBits(8) };
1173 float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
1174 float x4r, x4i, x5r, x5i, x6r, x6i, x7r, x7i;
1175 float xr, xi;
1176 1041
1177 int fullSize = Constants.TerrainPatchSize * Constants.TerrainPatchSize; 1042 // Quantized word bits
1043 if (header.QuantWBits == END_OF_PATCHES)
1044 return header;
1178 1045
1179 for (j = 0; j < fullSize; j += Constants.TerrainPatchSize) 1046 // DC offset
1180 { 1047 header.DCOffset = bitpack.UnpackFloat();
1181 x5r = C16_1R * tmp[1 + j] + C16_1I * tmp[15 + j]; 1048
1182 x5i = C16_1R * tmp[15 + j] - C16_1I * tmp[1 + j]; 1049 // Range
1183 xr = C16_7R * tmp[7 + j] + C16_7I * tmp[9 + j]; 1050 header.Range = bitpack.UnpackBits(16);
1184 xi = C16_7R * tmp[9 + j] - C16_7I * tmp[7 + j]; 1051
1185 x4r = x5r + xr; 1052 // Patch IDs (10 bits)
1186 x4i = x5i - xi; 1053 header.PatchIDs = bitpack.UnpackBits(10);
1187 x5r -= xr; 1054
1188 x5i += xi; 1055 // Word bits
1189 x7r = C16_5R * tmp[5 + j] + C16_5I * tmp[11 + j]; 1056 header.WordBits = (uint)((header.QuantWBits & 0x0f) + 2);
1190 x7i = C16_5R * tmp[11 + j] - C16_5I * tmp[5 + j]; 1057
1191 xr = C16_3R * tmp[3 + j] + C16_3I * tmp[13 + j]; 1058 return header;
1192 xi = C16_3R * tmp[13 + j] - C16_3I * tmp[3 + j]; 1059 }
1193 x6r = x7r + xr; 1060 */
1194 x6i = x7i - xi; 1061
1195 x7r -= xr; 1062 /*
1196 x7i += xi; 1063 public static void DecodePatch(int[] patches, BitPack bitpack, TerrainPatch.Header header, int size)
1197 xr = x4r - x6r; 1064 {
1198 xi = x4i - x6i; 1065 for (int n = 0; n < size * size; n++)
1199 x4r += x6r;
1200 x4i += x6i;
1201 x6r = W16_8R * (xi + xr);
1202 x6i = W16_8R * (xi - xr);
1203 xr = x5r + x7i;
1204 xi = x5i - x7r;
1205 x5r -= x7i;
1206 x5i += x7r;
1207 x7r = W16_4I * x5r + W16_4R * x5i;
1208 x7i = W16_4I * x5i - W16_4R * x5r;
1209 x5r = W16_4R * xr + W16_4I * xi;
1210 x5i = W16_4R * xi - W16_4I * xr;
1211 xr = C16_4R * tmp[4 + j] + C16_4I * tmp[12 + j];
1212 xi = C16_4R * tmp[12 + j] - C16_4I * tmp[4 + j];
1213 x2r = C16_8R * (tmp[0 + j] + tmp[8 + j]);
1214 x3r = C16_8R * (tmp[0 + j] - tmp[8 + j]);
1215 x0r = x2r + xr;
1216 x1r = x3r + xi;
1217 x2r -= xr;
1218 x3r -= xi;
1219 x0i = C16_2R * tmp[2 + j] + C16_2I * tmp[14 + j];
1220 x2i = C16_2R * tmp[14 + j] - C16_2I * tmp[2 + j];
1221 x1i = C16_6R * tmp[6 + j] + C16_6I * tmp[10 + j];
1222 x3i = C16_6R * tmp[10 + j] - C16_6I * tmp[6 + j];
1223 xr = x0i - x1i;
1224 xi = x2i + x3i;
1225 x0i += x1i;
1226 x2i -= x3i;
1227 x1i = W16_8R * (xi + xr);
1228 x3i = W16_8R * (xi - xr);
1229 xr = x0r + x0i;
1230 xi = x0r - x0i;
1231 tmp[0 + j] = xr + x4r;
1232 tmp[15 + j] = xr - x4r;
1233 tmp[8 + j] = xi + x4i;
1234 tmp[7 + j] = xi - x4i;
1235 xr = x1r + x1i;
1236 xi = x1r - x1i;
1237 tmp[2 + j] = xr + x5r;
1238 tmp[13 + j] = xr - x5r;
1239 tmp[10 + j] = xi + x5i;
1240 tmp[5 + j] = xi - x5i;
1241 xr = x2r + x2i;
1242 xi = x2r - x2i;
1243 tmp[4 + j] = xr + x6r;
1244 tmp[11 + j] = xr - x6r;
1245 tmp[12 + j] = xi + x6i;
1246 tmp[3 + j] = xi - x6i;
1247 xr = x3r + x3i;
1248 xi = x3r - x3i;
1249 tmp[6 + j] = xr + x7r;
1250 tmp[9 + j] = xr - x7r;
1251 tmp[14 + j] = xi + x7i;
1252 tmp[1 + j] = xi - x7i;
1253 }
1254 for (j = 0; j < fullSize; j += Constants.TerrainPatchSize)
1255 { 1066 {
1256 x5r = C16_1R * tmp[j + 1] + C16_1I * tmp[j + 15]; 1067 // ?
1257 x5i = C16_1R * tmp[j + 15] - C16_1I * tmp[j + 1]; 1068 int temp = bitpack.UnpackBits(1);
1258 xr = C16_7R * tmp[j + 7] + C16_7I * tmp[j + 9]; 1069 if (temp != 0)
1259 xi = C16_7R * tmp[j + 9] - C16_7I * tmp[j + 7]; 1070 {
1260 x4r = x5r + xr; 1071 // Value or EOB
1261 x4i = x5i - xi; 1072 temp = bitpack.UnpackBits(1);
1262 x5r -= xr; 1073 if (temp != 0)
1263 x5i += xi; 1074 {
1264 x7r = C16_5R * tmp[j + 5] + C16_5I * tmp[j + 11]; 1075 // Value
1265 x7i = C16_5R * tmp[j + 11] - C16_5I * tmp[j + 5]; 1076 temp = bitpack.UnpackBits(1);
1266 xr = C16_3R * tmp[j + 3] + C16_3I * tmp[j + 13]; 1077 if (temp != 0)
1267 xi = C16_3R * tmp[j + 13] - C16_3I * tmp[j + 3]; 1078 {
1268 x6r = x7r + xr; 1079 // Negative
1269 x6i = x7i - xi; 1080 temp = bitpack.UnpackBits((int)header.WordBits);
1270 x7r -= xr; 1081 patches[n] = temp * -1;
1271 x7i += xi; 1082 }
1272 xr = x4r - x6r; 1083 else
1273 xi = x4i - x6i; 1084 {
1274 x4r += x6r; 1085 // Positive
1275 x4i += x6i; 1086 temp = bitpack.UnpackBits((int)header.WordBits);
1276 x6r = W16_8R * (xi + xr); 1087 patches[n] = temp;
1277 x6i = W16_8R * (xi - xr); 1088 }
1278 xr = x5r + x7i; 1089 }
1279 xi = x5i - x7r; 1090 else
1280 x5r -= x7i; 1091 {
1281 x5i += x7r; 1092 // Set the rest to zero
1282 x7r = W16_4I * x5r + W16_4R * x5i; 1093 // TODO: This might not be necessary
1283 x7i = W16_4I * x5i - W16_4R * x5r; 1094 for (int o = n; o < size * size; o++)
1284 x5r = W16_4R * xr + W16_4I * xi; 1095 {
1285 x5i = W16_4R * xi - W16_4I * xr; 1096 patches[o] = 0;
1286 xr = C16_4R * tmp[j + 4] + C16_4I * tmp[j + 12]; 1097 }
1287 xi = C16_4R * tmp[j + 12] - C16_4I * tmp[j + 4]; 1098 break;
1288 x2r = C16_8R * (tmp[j + 0] + tmp[j + 8]); 1099 }
1289 x3r = C16_8R * (tmp[j + 0] - tmp[j + 8]); 1100 }
1290 x0r = x2r + xr; 1101 else
1291 x1r = x3r + xi; 1102 {
1292 x2r -= xr; 1103 patches[n] = 0;
1293 x3r -= xi; 1104 }
1294 x0i = C16_2R * tmp[j + 2] + C16_2I * tmp[j + 14];
1295 x2i = C16_2R * tmp[j + 14] - C16_2I * tmp[j + 2];
1296 x1i = C16_6R * tmp[j + 6] + C16_6I * tmp[j + 10];
1297 x3i = C16_6R * tmp[j + 10] - C16_6I * tmp[j + 6];
1298 xr = x0i - x1i;
1299 xi = x2i + x3i;
1300 x0i += x1i;
1301 x2i -= x3i;
1302 x1i = W16_8R * (xi + xr);
1303 x3i = W16_8R * (xi - xr);
1304 xr = x0r + x0i;
1305 xi = x0r - x0i;
1306 tmp[j + 0] = xr + x4r;
1307 tmp[j + 15] = xr - x4r;
1308 tmp[j + 8] = xi + x4i;
1309 tmp[j + 7] = xi - x4i;
1310 xr = x1r + x1i;
1311 xi = x1r - x1i;
1312 tmp[j + 2] = xr + x5r;
1313 tmp[j + 13] = xr - x5r;
1314 tmp[j + 10] = xi + x5i;
1315 tmp[j + 5] = xi - x5i;
1316 xr = x2r + x2i;
1317 xi = x2r - x2i;
1318 tmp[j + 4] = xr + x6r;
1319 tmp[j + 11] = xr - x6r;
1320 tmp[j + 12] = xi + x6i;
1321 tmp[j + 3] = xi - x6i;
1322 xr = x3r + x3i;
1323 xi = x3r - x3i;
1324 tmp[j + 6] = xr + x7r;
1325 tmp[j + 9] = xr - x7r;
1326 tmp[j + 14] = xi + x7i;
1327 tmp[j + 1] = xi - x7i;
1328 } 1105 }
1329 } 1106 }
1330 */ 1107 */
1331 #endregion DCT 1108 #region IDCT
1109 /* not in use
1110 private static void IDCTColumn16(float[] linein, float[] lineout, int column)
1111 {
1112 for (int n = 0; n < Constants.TerrainPatchSize; n++)
1113 {
1114 float total = OO_SQRT2 * linein[column];
1115
1116 for (int u = 1; u < Constants.TerrainPatchSize; u++)
1117 {
1118 int usize = u * Constants.TerrainPatchSize;
1119 total += linein[usize + column] * CosineTable16[usize + n];
1120 }
1121
1122 lineout[Constants.TerrainPatchSize * n + column] = total;
1123 }
1124 }
1125
1126 private static void IDCTLine16(float[] linein, float[] lineout, int line)
1127 {
1128 const float oosob = 2.0f / Constants.TerrainPatchSize;
1129 int lineSize = line * Constants.TerrainPatchSize;
1130
1131 for (int n = 0; n < Constants.TerrainPatchSize; n++)
1132 {
1133 float total = OO_SQRT2 * linein[lineSize];
1134
1135 for (int u = 1; u < Constants.TerrainPatchSize; u++)
1136 {
1137 total += linein[lineSize + u] * CosineTable16[u * Constants.TerrainPatchSize + n];
1138 }
1139
1140 lineout[lineSize + n] = total * oosob;
1141 }
1142 }
1143
1144/*
1145 private static void SetupCosines16()
1146 {
1147 const float hposz = (float)Math.PI * 0.5f / Constants.TerrainPatchSize;
1148
1149 for (int u = 0; u < Constants.TerrainPatchSize; u++)
1150 {
1151 for (int n = 0; n < Constants.TerrainPatchSize; n++)
1152 {
1153 CosineTable16[u * Constants.TerrainPatchSize + n] = (float)Math.Cos((2.0f * n + 1.0f) * u * hposz);
1154 }
1155 }
1156 }
1157*/
1158 //not in use, and still not fixed
1159 /*
1160 static void idct16x16(float[] a)
1161 {
1162 int j;
1163 float x0r, x0i, x1r, x1i, x2r, x2i, x3r, x3i;
1164 float x4r, x4i, x5r, x5i, x6r, x6i, x7r, x7i;
1165 float xr, xi;
1166
1167 int fullSize = Constants.TerrainPatchSize * Constants.TerrainPatchSize;
1168
1169 for (j = 0; j < fullSize; j += Constants.TerrainPatchSize)
1170 {
1171 x5r = C16_1R * tmp[1 + j] + C16_1I * tmp[15 + j];
1172 x5i = C16_1R * tmp[15 + j] - C16_1I * tmp[1 + j];
1173 xr = C16_7R * tmp[7 + j] + C16_7I * tmp[9 + j];
1174 xi = C16_7R * tmp[9 + j] - C16_7I * tmp[7 + j];
1175 x4r = x5r + xr;
1176 x4i = x5i - xi;
1177 x5r -= xr;
1178 x5i += xi;
1179 x7r = C16_5R * tmp[5 + j] + C16_5I * tmp[11 + j];
1180 x7i = C16_5R * tmp[11 + j] - C16_5I * tmp[5 + j];
1181 xr = C16_3R * tmp[3 + j] + C16_3I * tmp[13 + j];
1182 xi = C16_3R * tmp[13 + j] - C16_3I * tmp[3 + j];
1183 x6r = x7r + xr;
1184 x6i = x7i - xi;
1185 x7r -= xr;
1186 x7i += xi;
1187 xr = x4r - x6r;
1188 xi = x4i - x6i;
1189 x4r += x6r;
1190 x4i += x6i;
1191 x6r = W16_8R * (xi + xr);
1192 x6i = W16_8R * (xi - xr);
1193 xr = x5r + x7i;
1194 xi = x5i - x7r;
1195 x5r -= x7i;
1196 x5i += x7r;
1197 x7r = W16_4I * x5r + W16_4R * x5i;
1198 x7i = W16_4I * x5i - W16_4R * x5r;
1199 x5r = W16_4R * xr + W16_4I * xi;
1200 x5i = W16_4R * xi - W16_4I * xr;
1201 xr = C16_4R * tmp[4 + j] + C16_4I * tmp[12 + j];
1202 xi = C16_4R * tmp[12 + j] - C16_4I * tmp[4 + j];
1203 x2r = C16_8R * (tmp[0 + j] + tmp[8 + j]);
1204 x3r = C16_8R * (tmp[0 + j] - tmp[8 + j]);
1205 x0r = x2r + xr;
1206 x1r = x3r + xi;
1207 x2r -= xr;
1208 x3r -= xi;
1209 x0i = C16_2R * tmp[2 + j] + C16_2I * tmp[14 + j];
1210 x2i = C16_2R * tmp[14 + j] - C16_2I * tmp[2 + j];
1211 x1i = C16_6R * tmp[6 + j] + C16_6I * tmp[10 + j];
1212 x3i = C16_6R * tmp[10 + j] - C16_6I * tmp[6 + j];
1213 xr = x0i - x1i;
1214 xi = x2i + x3i;
1215 x0i += x1i;
1216 x2i -= x3i;
1217 x1i = W16_8R * (xi + xr);
1218 x3i = W16_8R * (xi - xr);
1219 xr = x0r + x0i;
1220 xi = x0r - x0i;
1221 tmp[0 + j] = xr + x4r;
1222 tmp[15 + j] = xr - x4r;
1223 tmp[8 + j] = xi + x4i;
1224 tmp[7 + j] = xi - x4i;
1225 xr = x1r + x1i;
1226 xi = x1r - x1i;
1227 tmp[2 + j] = xr + x5r;
1228 tmp[13 + j] = xr - x5r;
1229 tmp[10 + j] = xi + x5i;
1230 tmp[5 + j] = xi - x5i;
1231 xr = x2r + x2i;
1232 xi = x2r - x2i;
1233 tmp[4 + j] = xr + x6r;
1234 tmp[11 + j] = xr - x6r;
1235 tmp[12 + j] = xi + x6i;
1236 tmp[3 + j] = xi - x6i;
1237 xr = x3r + x3i;
1238 xi = x3r - x3i;
1239 tmp[6 + j] = xr + x7r;
1240 tmp[9 + j] = xr - x7r;
1241 tmp[14 + j] = xi + x7i;
1242 tmp[1 + j] = xi - x7i;
1243 }
1244 for (j = 0; j < fullSize; j += Constants.TerrainPatchSize)
1245 {
1246 x5r = C16_1R * tmp[j + 1] + C16_1I * tmp[j + 15];
1247 x5i = C16_1R * tmp[j + 15] - C16_1I * tmp[j + 1];
1248 xr = C16_7R * tmp[j + 7] + C16_7I * tmp[j + 9];
1249 xi = C16_7R * tmp[j + 9] - C16_7I * tmp[j + 7];
1250 x4r = x5r + xr;
1251 x4i = x5i - xi;
1252 x5r -= xr;
1253 x5i += xi;
1254 x7r = C16_5R * tmp[j + 5] + C16_5I * tmp[j + 11];
1255 x7i = C16_5R * tmp[j + 11] - C16_5I * tmp[j + 5];
1256 xr = C16_3R * tmp[j + 3] + C16_3I * tmp[j + 13];
1257 xi = C16_3R * tmp[j + 13] - C16_3I * tmp[j + 3];
1258 x6r = x7r + xr;
1259 x6i = x7i - xi;
1260 x7r -= xr;
1261 x7i += xi;
1262 xr = x4r - x6r;
1263 xi = x4i - x6i;
1264 x4r += x6r;
1265 x4i += x6i;
1266 x6r = W16_8R * (xi + xr);
1267 x6i = W16_8R * (xi - xr);
1268 xr = x5r + x7i;
1269 xi = x5i - x7r;
1270 x5r -= x7i;
1271 x5i += x7r;
1272 x7r = W16_4I * x5r + W16_4R * x5i;
1273 x7i = W16_4I * x5i - W16_4R * x5r;
1274 x5r = W16_4R * xr + W16_4I * xi;
1275 x5i = W16_4R * xi - W16_4I * xr;
1276 xr = C16_4R * tmp[j + 4] + C16_4I * tmp[j + 12];
1277 xi = C16_4R * tmp[j + 12] - C16_4I * tmp[j + 4];
1278 x2r = C16_8R * (tmp[j + 0] + tmp[j + 8]);
1279 x3r = C16_8R * (tmp[j + 0] - tmp[j + 8]);
1280 x0r = x2r + xr;
1281 x1r = x3r + xi;
1282 x2r -= xr;
1283 x3r -= xi;
1284 x0i = C16_2R * tmp[j + 2] + C16_2I * tmp[j + 14];
1285 x2i = C16_2R * tmp[j + 14] - C16_2I * tmp[j + 2];
1286 x1i = C16_6R * tmp[j + 6] + C16_6I * tmp[j + 10];
1287 x3i = C16_6R * tmp[j + 10] - C16_6I * tmp[j + 6];
1288 xr = x0i - x1i;
1289 xi = x2i + x3i;
1290 x0i += x1i;
1291 x2i -= x3i;
1292 x1i = W16_8R * (xi + xr);
1293 x3i = W16_8R * (xi - xr);
1294 xr = x0r + x0i;
1295 xi = x0r - x0i;
1296 tmp[j + 0] = xr + x4r;
1297 tmp[j + 15] = xr - x4r;
1298 tmp[j + 8] = xi + x4i;
1299 tmp[j + 7] = xi - x4i;
1300 xr = x1r + x1i;
1301 xi = x1r - x1i;
1302 tmp[j + 2] = xr + x5r;
1303 tmp[j + 13] = xr - x5r;
1304 tmp[j + 10] = xi + x5i;
1305 tmp[j + 5] = xi - x5i;
1306 xr = x2r + x2i;
1307 xi = x2r - x2i;
1308 tmp[j + 4] = xr + x6r;
1309 tmp[j + 11] = xr - x6r;
1310 tmp[j + 12] = xi + x6i;
1311 tmp[j + 3] = xi - x6i;
1312 xr = x3r + x3i;
1313 xi = x3r - x3i;
1314 tmp[j + 6] = xr + x7r;
1315 tmp[j + 9] = xr - x7r;
1316 tmp[j + 14] = xi + x7i;
1317 tmp[j + 1] = xi - x7i;
1318 }
1319 }
1320 */
1321 #endregion IDCT
1322 #endregion Decode
1332 } 1323 }
1333 1324
1334} 1325}
generated by cgit v1.1 at 2024-08-22 08:20:23 +0000