1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
|
#region --- License ---
/* Licensed under the MIT/X11 license.
* Copyright (c) 2006-2008 the OpenTK Team.
* This notice may not be removed from any source distribution.
* See license.txt for licensing details.
*/
#endregion
// #define READALL
// uncomment so ALL fields read from file are interpreted and filled. Necessary to implement uncompressed DDS
// TODO: Find app that can build compressed dds cubemaps and verify that the import code works.
using System;
using System.IO;
using System.Diagnostics;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
namespace Examples.TextureLoaders
{
/// <summary>
/// Expects the presence of a valid OpenGL Context and Texture Compression Extensions (GL 1.5) and Cube Maps (GL 1.3).
/// You will get what you give. No automatic Mipmap generation or automatic compression is done. (both bad quality)
/// Textures are never rescaled or checked if Power of 2, but you should make the Width and Height a multiple of 4 because DXTn uses 4x4 blocks.
/// (Image displays correctly but runs extremely slow with non-power-of-two Textures on FX5600, Cache misses?)
/// CubeMap support is experimental and the file must specify all 6 faces to work at all.
/// </summary>
static class ImageDDS
{
#region Constants
private const byte HeaderSizeInBytes = 128; // all non-image data together is 128 Bytes
private const uint BitMask = 0x00000007; // bits = 00 00 01 11
private static NotImplementedException Unfinished = new NotImplementedException( "ERROR: Only 2 Dimensional DXT1/3/5 compressed images for now. 1D/3D Textures may not be compressed according to spec." );
#endregion Constants
#region Simplified In-Memory representation of the Image
private static bool _IsCompressed;
private static int _Width, _Height, _Depth, _MipMapCount;
private static int _BytesForMainSurface; // must be handled with care when implementing uncompressed formats!
private static byte _BytesPerBlock;
private static PixelInternalFormat _PixelInternalFormat;
#endregion Simplified In-Memory representation of the Image
#region Flag Enums
[Flags] // Surface Description
private enum eDDSD: uint
{
CAPS = 0x00000001, // is always present
HEIGHT = 0x00000002, // is always present
WIDTH = 0x00000004, // is always present
PITCH = 0x00000008, // is set if the image is uncompressed
PIXELFORMAT = 0x00001000, // is always present
MIPMAPCOUNT = 0x00020000, // is set if the image contains MipMaps
LINEARSIZE = 0x00080000, // is set if the image is compressed
DEPTH = 0x00800000 // is set for 3D Volume Textures
}
[Flags] // Pixelformat
private enum eDDPF: uint
{
NONE = 0x00000000, // not part of DX, added for convenience
ALPHAPIXELS = 0x00000001,
FOURCC = 0x00000004,
RGB = 0x00000040,
RGBA = 0x00000041
}
/// <summary>This list was derived from nVidia OpenGL SDK</summary>
[Flags] // Texture types
private enum eFOURCC: uint
{
UNKNOWN = 0,
#if READALL
R8G8B8 = 20,
A8R8G8B8 = 21,
X8R8G8B8 = 22,
R5G6B5 = 23,
X1R5G5B5 = 24,
A1R5G5B5 = 25,
A4R4G4B4 = 26,
R3G3B2 = 27,
A8 = 28,
A8R3G3B2 = 29,
X4R4G4B4 = 30,
A2B10G10R10 = 31,
A8B8G8R8 = 32,
X8B8G8R8 = 33,
G16R16 = 34,
A2R10G10B10 = 35,
A16B16G16R16 = 36,
L8 = 50,
A8L8 = 51,
A4L4 = 52,
D16_LOCKABLE = 70,
D32 = 71,
D24X8 = 77,
D16 = 80,
D32F_LOCKABLE = 82,
L16 = 81,
// s10e5 formats (16-bits per channel)
R16F = 111,
G16R16F = 112,
A16B16G16R16F = 113,
// IEEE s23e8 formats (32-bits per channel)
R32F = 114,
G32R32F = 115,
A32B32G32R32F = 116
#endif
DXT1 = 0x31545844,
DXT2 = 0x32545844,
DXT3 = 0x33545844,
DXT4 = 0x34545844,
DXT5 = 0x35545844,
}
[Flags] // dwCaps1
private enum eDDSCAPS: uint
{
NONE = 0x00000000, // not part of DX, added for convenience
COMPLEX = 0x00000008, // should be set for any DDS file with more than one main surface
TEXTURE = 0x00001000, // should always be set
MIPMAP = 0x00400000 // only for files with MipMaps
}
[Flags] // dwCaps2
private enum eDDSCAPS2: uint
{
NONE = 0x00000000, // not part of DX, added for convenience
CUBEMAP = 0x00000200,
CUBEMAP_POSITIVEX = 0x00000400,
CUBEMAP_NEGATIVEX = 0x00000800,
CUBEMAP_POSITIVEY = 0x00001000,
CUBEMAP_NEGATIVEY = 0x00002000,
CUBEMAP_POSITIVEZ = 0x00004000,
CUBEMAP_NEGATIVEZ = 0x00008000,
CUBEMAP_ALL_FACES = 0x0000FC00,
VOLUME = 0x00200000 // for 3D Textures
}
#endregion Flag Enums
#region Private Members
private static string idString; // 4 bytes, must be "DDS "
private static UInt32 dwSize; // Size of structure is 124 bytes, 128 including all sub-structs and the header
private static UInt32 dwFlags; // Flags to indicate valid fields.
private static UInt32 dwHeight; // Height of the main image in pixels
private static UInt32 dwWidth; // Width of the main image in pixels
private static UInt32 dwPitchOrLinearSize; // For compressed formats, this is the total number of bytes for the main image.
private static UInt32 dwDepth; // For volume textures, this is the depth of the volume.
private static UInt32 dwMipMapCount; // total number of levels in the mipmap chain of the main image.
#if READALL
private static UInt32[] dwReserved1; // 11 UInt32s
#endif
// Pixelformat sub-struct, 32 bytes
private static UInt32 pfSize; // Size of Pixelformat structure. This member must be set to 32.
private static UInt32 pfFlags; // Flags to indicate valid fields.
private static UInt32 pfFourCC; // This is the four-character code for compressed formats.
#if READALL
private static UInt32 pfRGBBitCount; // For RGB formats, this is the total number of bits in the format. dwFlags should include DDpf_RGB in this case. This value is usually 16, 24, or 32. For A8R8G8B8, this value would be 32.
private static UInt32 pfRBitMask; // For RGB formats, these three fields contain the masks for the red, green, and blue channels. For A8R8G8B8, these values would be 0x00ff0000, 0x0000ff00, and 0x000000ff respectively.
private static UInt32 pfGBitMask; // ..
private static UInt32 pfBBitMask; // ..
private static UInt32 pfABitMask; // For RGB formats, this contains the mask for the alpha channel, if any. dwFlags should include DDpf_ALPHAPIXELS in this case. For A8R8G8B8, this value would be 0xff000000.
#endif
// Capabilities sub-struct, 16 bytes
private static UInt32 dwCaps1; // always includes DDSCAPS_TEXTURE. with more than one main surface DDSCAPS_COMPLEX should also be set.
private static UInt32 dwCaps2; // For cubic environment maps, DDSCAPS2_CUBEMAP should be included as well as one or more faces of the map (DDSCAPS2_CUBEMAP_POSITIVEX, DDSCAPS2_CUBEMAP_NEGATIVEX, DDSCAPS2_CUBEMAP_POSITIVEY, DDSCAPS2_CUBEMAP_NEGATIVEY, DDSCAPS2_CUBEMAP_POSITIVEZ, DDSCAPS2_CUBEMAP_NEGATIVEZ). For volume textures, DDSCAPS2_VOLUME should be included.
#if READALL
private static UInt32[] dwReserved2; // 3 = 2 + 1 UInt32
#endif
#endregion Private Members
/// <summary>
/// This function will generate, bind and fill a Texture Object with a DXT1/3/5 compressed Texture in .dds Format.
/// MipMaps below 4x4 Pixel Size are discarded, because DXTn's smallest unit is a 4x4 block of Pixel data.
/// It will set correct MipMap parameters, Filtering, Wrapping and EnvMode for the Texture.
/// The only call inside this function affecting OpenGL State is GL.BindTexture();
/// </summary>
/// <param name="filename">The name of the file you wish to load, including path and file extension.</param>
/// <param name="texturehandle">0 if invalid, otherwise a Texture Object usable with GL.BindTexture().</param>
/// <param name="dimension">0 if invalid, will output what was loaded (typically Texture1D/2D/3D or Cubemap)</param>
public static void LoadFromDisk( string filename, out uint texturehandle, out TextureTarget dimension )
{
#region Prep data
// invalidate whatever it was before
dimension = (TextureTarget) 0;
texturehandle = TextureLoaderParameters.OpenGLDefaultTexture;
ErrorCode GLError = ErrorCode.NoError;
_IsCompressed = false;
_Width = 0;
_Height = 0;
_Depth = 0;
_MipMapCount = 0;
_BytesForMainSurface = 0;
_BytesPerBlock = 0;
_PixelInternalFormat = PixelInternalFormat.Rgba8;
byte[] _RawDataFromFile;
#endregion
#region Try
try // Exceptions will be thrown if any Problem occurs while working on the file.
{
_RawDataFromFile = File.ReadAllBytes( @filename );
#region Translate Header to less cryptic representation
ConvertDX9Header( ref _RawDataFromFile ); // The first 128 Bytes of the file is non-image data
// start by checking if all forced flags are present. Flags indicate valid fields, but aren't written by every tool .....
if ( idString != "DDS " || // magic key
dwSize != 124 || // constant size of struct, never reused
pfSize != 32 || // constant size of struct, never reused
!CheckFlag( dwFlags, (uint) eDDSD.CAPS ) || // must know it's caps
!CheckFlag( dwFlags, (uint) eDDSD.PIXELFORMAT ) || // must know it's format
!CheckFlag( dwCaps1, (uint) eDDSCAPS.TEXTURE ) // must be a Texture
)
throw new ArgumentException( "ERROR: File has invalid signature or missing Flags." );
#region Examine Flags
if ( CheckFlag( dwFlags, (uint) eDDSD.WIDTH ) )
_Width = (int) dwWidth;
else
throw new ArgumentException( "ERROR: Flag for Width not set." );
if ( CheckFlag( dwFlags, (uint) eDDSD.HEIGHT ) )
_Height = (int) dwHeight;
else
throw new ArgumentException( "ERROR: Flag for Height not set." );
if ( CheckFlag( dwFlags, (uint) eDDSD.DEPTH ) && CheckFlag( dwCaps2, (uint) eDDSCAPS2.VOLUME ) )
{
dimension = TextureTarget.Texture3D; // image is 3D Volume
_Depth = (int) dwDepth;
throw Unfinished;
} else
{// image is 2D or Cube
if ( CheckFlag( dwCaps2, (uint) eDDSCAPS2.CUBEMAP ) )
{
dimension = TextureTarget.TextureCubeMap;
_Depth = 6;
} else
{
dimension = TextureTarget.Texture2D;
_Depth = 1;
}
}
// these flags must be set for mipmaps to be included
if ( CheckFlag( dwCaps1, (uint) eDDSCAPS.MIPMAP ) && CheckFlag( dwFlags, (uint) eDDSD.MIPMAPCOUNT ) )
_MipMapCount = (int) dwMipMapCount; // image contains MipMaps
else
_MipMapCount = 1; // only 1 main image
// Should never happen
if ( CheckFlag( dwFlags, (uint) eDDSD.PITCH ) && CheckFlag( dwFlags, (uint) eDDSD.LINEARSIZE ) )
throw new ArgumentException( "INVALID: Pitch AND Linear Flags both set. Image cannot be uncompressed and DTXn compressed at the same time." );
// This flag is set if format is uncompressed RGB RGBA etc.
if ( CheckFlag( dwFlags, (uint) eDDSD.PITCH ) )
{
// _BytesForMainSurface = (int) dwPitchOrLinearSize; // holds bytes-per-scanline for uncompressed
_IsCompressed = false;
throw Unfinished;
}
// This flag is set if format is compressed DXTn.
if ( CheckFlag( dwFlags, (uint) eDDSD.LINEARSIZE ) )
{
_BytesForMainSurface = (int) dwPitchOrLinearSize;
_IsCompressed = true;
}
#endregion Examine Flags
#region Examine Pixel Format, anything but DXTn will fail atm.
if ( CheckFlag( pfFlags, (uint) eDDPF.FOURCC ) )
switch ( (eFOURCC) pfFourCC )
{
case eFOURCC.DXT1:
_PixelInternalFormat = (PixelInternalFormat) ExtTextureCompressionS3tc.CompressedRgbS3tcDxt1Ext;
_BytesPerBlock = 8;
_IsCompressed = true;
break;
//case eFOURCC.DXT2:
case eFOURCC.DXT3:
_PixelInternalFormat = (PixelInternalFormat) ExtTextureCompressionS3tc.CompressedRgbaS3tcDxt3Ext;
_BytesPerBlock = 16;
_IsCompressed = true;
break;
//case eFOURCC.DXT4:
case eFOURCC.DXT5:
_PixelInternalFormat = (PixelInternalFormat) ExtTextureCompressionS3tc.CompressedRgbaS3tcDxt5Ext;
_BytesPerBlock = 16;
_IsCompressed = true;
break;
default:
throw Unfinished; // handle uncompressed formats
} else
throw Unfinished;
// pf*Bitmasks should be examined here
#endregion
// Works, but commented out because some texture authoring tools don't set this flag.
/* Safety Check, if file is only 1x 2D surface without mipmaps, eDDSCAPS.COMPLEX should not be set
if ( CheckFlag( dwCaps1, (uint) eDDSCAPS.COMPLEX ) )
{
if ( result == eTextureDimension.Texture2D && _MipMapCount == 1 ) // catch potential problem
Trace.WriteLine( "Warning: Image is declared complex, but contains only 1 surface." );
}*/
if ( TextureLoaderParameters.Verbose )
Trace.WriteLine( "\n" + GetDescriptionFromMemory( filename, dimension ) );
#endregion Translate Header to less cryptic representation
#region send the Texture to GL
#region Generate and Bind Handle
GL.GenTextures( 1, out texturehandle );
GL.BindTexture( dimension, texturehandle );
#endregion Generate and Bind Handle
int Cursor = HeaderSizeInBytes;
// foreach face in the cubemap, get all it's mipmaps levels. Only one iteration for Texture2D
for ( int Slices = 0 ; Slices < _Depth ; Slices++ )
{
int trueMipMapCount = _MipMapCount - 1; // TODO: triplecheck correctness
int Width = _Width;
int Height = _Height;
for ( int Level = 0 ; Level < _MipMapCount ; Level++ ) // start at base image
{
#region determine Dimensions
int BlocksPerRow = ( Width + 3 ) >> 2;
int BlocksPerColumn = ( Height + 3 ) >> 2;
int SurfaceBlockCount = BlocksPerRow * BlocksPerColumn; // // DXTn stores Texels in 4x4 blocks, a Color block is 8 Bytes, an Alpha block is 8 Bytes for DXT3/5
int SurfaceSizeInBytes = SurfaceBlockCount * _BytesPerBlock;
// this check must evaluate to false for 2D and Cube maps, or it's impossible to determine MipMap sizes.
if ( TextureLoaderParameters.Verbose && Level == 0 && _IsCompressed && _BytesForMainSurface != SurfaceSizeInBytes )
Trace.WriteLine( "Warning: Calculated byte-count of main image differs from what was read from file." );
#endregion determine Dimensions
// skip mipmaps smaller than a 4x4 Pixels block, which is the smallest DXTn unit.
if ( Width > 2 && Height > 2 )
{ // Note: there could be a potential problem with non-power-of-two cube maps
#region Prepare Array for TexImage
byte[] RawDataOfSurface = new byte[SurfaceSizeInBytes];
if ( !TextureLoaderParameters.FlipImages )
{ // no changes to the image, copy as is
Array.Copy( _RawDataFromFile, Cursor, RawDataOfSurface, 0, SurfaceSizeInBytes );
} else
{ // Turn the blocks upside down and the rows aswell, done in a single pass through all blocks
for ( int sourceColumn = 0 ; sourceColumn < BlocksPerColumn ; sourceColumn++ )
{
int targetColumn = BlocksPerColumn - sourceColumn - 1;
for ( int row = 0 ; row < BlocksPerRow ; row++ )
{
int target = ( targetColumn * BlocksPerRow + row ) * _BytesPerBlock;
int source = ( sourceColumn * BlocksPerRow + row ) * _BytesPerBlock + Cursor;
#region Swap Bytes
switch ( _PixelInternalFormat )
{
case (PixelInternalFormat) ExtTextureCompressionS3tc.CompressedRgbS3tcDxt1Ext:
// Color only
RawDataOfSurface[target + 0] = _RawDataFromFile[source + 0];
RawDataOfSurface[target + 1] = _RawDataFromFile[source + 1];
RawDataOfSurface[target + 2] = _RawDataFromFile[source + 2];
RawDataOfSurface[target + 3] = _RawDataFromFile[source + 3];
RawDataOfSurface[target + 4] = _RawDataFromFile[source + 7];
RawDataOfSurface[target + 5] = _RawDataFromFile[source + 6];
RawDataOfSurface[target + 6] = _RawDataFromFile[source + 5];
RawDataOfSurface[target + 7] = _RawDataFromFile[source + 4];
break;
case (PixelInternalFormat) ExtTextureCompressionS3tc.CompressedRgbaS3tcDxt3Ext:
// Alpha
RawDataOfSurface[target + 0] = _RawDataFromFile[source + 6];
RawDataOfSurface[target + 1] = _RawDataFromFile[source + 7];
RawDataOfSurface[target + 2] = _RawDataFromFile[source + 4];
RawDataOfSurface[target + 3] = _RawDataFromFile[source + 5];
RawDataOfSurface[target + 4] = _RawDataFromFile[source + 2];
RawDataOfSurface[target + 5] = _RawDataFromFile[source + 3];
RawDataOfSurface[target + 6] = _RawDataFromFile[source + 0];
RawDataOfSurface[target + 7] = _RawDataFromFile[source + 1];
// Color
RawDataOfSurface[target + 8] = _RawDataFromFile[source + 8];
RawDataOfSurface[target + 9] = _RawDataFromFile[source + 9];
RawDataOfSurface[target + 10] = _RawDataFromFile[source + 10];
RawDataOfSurface[target + 11] = _RawDataFromFile[source + 11];
RawDataOfSurface[target + 12] = _RawDataFromFile[source + 15];
RawDataOfSurface[target + 13] = _RawDataFromFile[source + 14];
RawDataOfSurface[target + 14] = _RawDataFromFile[source + 13];
RawDataOfSurface[target + 15] = _RawDataFromFile[source + 12];
break;
case (PixelInternalFormat) ExtTextureCompressionS3tc.CompressedRgbaS3tcDxt5Ext:
// Alpha, the first 2 bytes remain
RawDataOfSurface[target + 0] = _RawDataFromFile[source + 0];
RawDataOfSurface[target + 1] = _RawDataFromFile[source + 1];
// extract 3 bits each and flip them
GetBytesFromUInt24( ref RawDataOfSurface, (uint) target + 5, FlipUInt24( GetUInt24( ref _RawDataFromFile, (uint) source + 2 ) ) );
GetBytesFromUInt24( ref RawDataOfSurface, (uint) target + 2, FlipUInt24( GetUInt24( ref _RawDataFromFile, (uint) source + 5 ) ) );
// Color
RawDataOfSurface[target + 8] = _RawDataFromFile[source + 8];
RawDataOfSurface[target + 9] = _RawDataFromFile[source + 9];
RawDataOfSurface[target + 10] = _RawDataFromFile[source + 10];
RawDataOfSurface[target + 11] = _RawDataFromFile[source + 11];
RawDataOfSurface[target + 12] = _RawDataFromFile[source + 15];
RawDataOfSurface[target + 13] = _RawDataFromFile[source + 14];
RawDataOfSurface[target + 14] = _RawDataFromFile[source + 13];
RawDataOfSurface[target + 15] = _RawDataFromFile[source + 12];
break;
default:
throw new ArgumentException( "ERROR: Should have never arrived here! Bad _PixelInternalFormat! Should have been dealt with much earlier." );
}
#endregion Swap Bytes
}
}
}
#endregion Prepare Array for TexImage
#region Create TexImage
switch ( dimension )
{
case TextureTarget.Texture2D:
GL.CompressedTexImage2D( TextureTarget.Texture2D,
Level,
_PixelInternalFormat,
Width,
Height,
TextureLoaderParameters.Border,
SurfaceSizeInBytes,
RawDataOfSurface );
break;
case TextureTarget.TextureCubeMap:
GL.CompressedTexImage2D( TextureTarget.TextureCubeMapPositiveX + Slices,
Level,
_PixelInternalFormat,
Width,
Height,
TextureLoaderParameters.Border,
SurfaceSizeInBytes,
RawDataOfSurface );
break;
case TextureTarget.Texture1D: // Untested
case TextureTarget.Texture3D: // Untested
default:
throw new ArgumentException( "ERROR: Use DXT for 2D Images only. Cannot evaluate " + dimension );
}
GL.Finish( );
#endregion Create TexImage
#region Query Success
int width, height, internalformat, compressed;
switch ( dimension )
{
case TextureTarget.Texture1D:
case TextureTarget.Texture2D:
case TextureTarget.Texture3D:
GL.GetTexLevelParameter( dimension, Level, GetTextureParameter.TextureWidth, out width );
GL.GetTexLevelParameter( dimension, Level, GetTextureParameter.TextureHeight, out height );
GL.GetTexLevelParameter( dimension, Level, GetTextureParameter.TextureInternalFormat, out internalformat );
GL.GetTexLevelParameter( dimension, Level, GetTextureParameter.TextureCompressed, out compressed );
break;
case TextureTarget.TextureCubeMap:
GL.GetTexLevelParameter( TextureTarget.TextureCubeMapPositiveX + Slices, Level, GetTextureParameter.TextureWidth, out width );
GL.GetTexLevelParameter( TextureTarget.TextureCubeMapPositiveX + Slices, Level, GetTextureParameter.TextureHeight, out height );
GL.GetTexLevelParameter( TextureTarget.TextureCubeMapPositiveX + Slices, Level, GetTextureParameter.TextureInternalFormat, out internalformat );
GL.GetTexLevelParameter( TextureTarget.TextureCubeMapPositiveX + Slices, Level, GetTextureParameter.TextureCompressed, out compressed );
break;
default:
throw Unfinished;
}
GLError = GL.GetError( );
if ( TextureLoaderParameters.Verbose )
Trace.WriteLine( "GL: " + GLError.ToString( ) + " Level: " + Level + " DXTn: " + ( ( compressed == 1 ) ? "Yes" : "No" ) + " Frmt:" + (ExtTextureCompressionS3tc) internalformat + " " + width + "*" + height );
if ( GLError != ErrorCode.NoError || compressed == 0 || width == 0 || height == 0 || internalformat == 0 )
{
GL.DeleteTextures( 1, ref texturehandle );
throw new ArgumentException( "ERROR: Something went wrong after GL.CompressedTexImage(); Last GL Error: " + GLError.ToString( ) );
}
#endregion Query Success
} else
{
if ( trueMipMapCount > Level )
trueMipMapCount = Level - 1; // The current Level is invalid
}
#region Prepare the next MipMap level
Width /= 2;
if ( Width < 1 )
Width = 1;
Height /= 2;
if ( Height < 1 )
Height = 1;
Cursor += SurfaceSizeInBytes;
#endregion Prepare the next MipMap level
}
#region Set States properly
GL.TexParameter( dimension, (TextureParameterName) All.TextureBaseLevel, 0 );
GL.TexParameter( dimension, (TextureParameterName) All.TextureMaxLevel, trueMipMapCount );
int TexMaxLevel;
GL.GetTexParameter( dimension, GetTextureParameter.TextureMaxLevel, out TexMaxLevel );
if ( TextureLoaderParameters.Verbose )
Trace.WriteLine( "Verification: GL: " + GL.GetError( ).ToString( ) + " TextureMaxLevel: " + TexMaxLevel + ( ( TexMaxLevel == trueMipMapCount ) ? " (Correct.)" : " (Wrong!)" ) );
#endregion Set States properly
}
#region Set Texture Parameters
GL.TexParameter( dimension, TextureParameterName.TextureMinFilter, (int) TextureLoaderParameters.MinificationFilter );
GL.TexParameter( dimension, TextureParameterName.TextureMagFilter, (int) TextureLoaderParameters.MagnificationFilter );
GL.TexParameter( dimension, TextureParameterName.TextureWrapS, (int) TextureLoaderParameters.WrapModeS );
GL.TexParameter( dimension, TextureParameterName.TextureWrapT, (int) TextureLoaderParameters.WrapModeT );
GL.TexEnv( TextureEnvTarget.TextureEnv, TextureEnvParameter.TextureEnvMode, (int) TextureLoaderParameters.EnvMode );
GLError = GL.GetError( );
if ( GLError != ErrorCode.NoError )
{
throw new ArgumentException( "Error setting Texture Parameters. GL Error: " + GLError );
}
#endregion Set Texture Parameters
// If it made it here without throwing any Exception the result is a valid Texture.
return; // success
#endregion send the Texture to GL
} catch ( Exception e )
{
dimension = (TextureTarget) 0;
texturehandle = TextureLoaderParameters.OpenGLDefaultTexture;
throw new ArgumentException( "ERROR: Exception caught when attempting to load file " + filename + ".\n" + e + "\n" + GetDescriptionFromFile( filename ) );
// return; // failure
} finally
{
_RawDataFromFile = null; // clarity, not really needed
}
#endregion Try
}
#region Helpers
private static void ConvertDX9Header( ref byte[] input )
{
UInt32 offset = 0;
idString = GetString( ref input, offset );
offset += 4;
dwSize = GetUInt32( ref input, offset );
offset += 4;
dwFlags = GetUInt32( ref input, offset );
offset += 4;
dwHeight = GetUInt32( ref input, offset );
offset += 4;
dwWidth = GetUInt32( ref input, offset );
offset += 4;
dwPitchOrLinearSize = GetUInt32( ref input, offset );
offset += 4;
dwDepth = GetUInt32( ref input, offset );
offset += 4;
dwMipMapCount = GetUInt32( ref input, offset );
offset += 4;
#if READALL
dwReserved1 = new UInt32[11]; // reserved
#endif
offset += 4 * 11;
pfSize = GetUInt32( ref input, offset );
offset += 4;
pfFlags = GetUInt32( ref input, offset );
offset += 4;
pfFourCC = GetUInt32( ref input, offset );
offset += 4;
#if READALL
pfRGBBitCount = GetUInt32( ref input, offset );
offset += 4;
pfRBitMask = GetUInt32( ref input, offset );
offset += 4;
pfGBitMask = GetUInt32( ref input, offset );
offset += 4;
pfBBitMask = GetUInt32( ref input, offset );
offset += 4;
pfABitMask = GetUInt32( ref input, offset );
offset += 4;
#else
offset += 20;
#endif
dwCaps1 = GetUInt32( ref input, offset );
offset += 4;
dwCaps2 = GetUInt32( ref input, offset );
offset += 4;
#if READALL
dwReserved2 = new UInt32[3]; // offset is 4+112 here, + 12 = 4+124
#endif
offset += 4 * 3;
}
/// <summary> Returns true if the flag is set, false otherwise</summary>
private static bool CheckFlag( uint variable, uint flag )
{
return ( variable & flag ) > 0 ? true : false;
}
private static string GetString( ref byte[] input, uint offset )
{
return "" + (char) input[offset + 0] + (char) input[offset + 1] + (char) input[offset + 2] + (char) input[offset + 3];
}
private static uint GetUInt32( ref byte[] input, uint offset )
{
return (uint) ( ( ( input[offset + 3] * 256 + input[offset + 2] ) * 256 + input[offset + 1] ) * 256 + input[offset + 0] );
}
private static uint GetUInt24( ref byte[] input, uint offset )
{
return (uint) ( ( input[offset + 2] * 256 + input[offset + 1] ) * 256 + input[offset + 0] );
}
private static void GetBytesFromUInt24( ref byte[] input, uint offset, uint splitme )
{
input[offset + 0] = (byte) ( splitme & 0x000000ff );
input[offset + 1] = (byte) ( ( splitme & 0x0000ff00 ) >> 8 );
input[offset + 2] = (byte) ( ( splitme & 0x00ff0000 ) >> 16 );
return;
}
/// <summary>DXT5 Alpha block flipping, inspired by code from Evan Hart (nVidia SDK)</summary>
private static uint FlipUInt24( uint inputUInt24 )
{
byte[][] ThreeBits = new byte[2][];
for ( int i = 0 ; i < 2 ; i++ )
ThreeBits[i] = new byte[4];
// extract 3 bits each into the array
ThreeBits[0][0] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[0][1] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[0][2] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[0][3] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[1][0] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[1][1] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[1][2] = (byte) ( inputUInt24 & BitMask );
inputUInt24 >>= 3;
ThreeBits[1][3] = (byte) ( inputUInt24 & BitMask );
// stuff 8x 3bits into 3 bytes
uint Result = 0;
Result = Result | (uint) ( ThreeBits[1][0] << 0 );
Result = Result | (uint) ( ThreeBits[1][1] << 3 );
Result = Result | (uint) ( ThreeBits[1][2] << 6 );
Result = Result | (uint) ( ThreeBits[1][3] << 9 );
Result = Result | (uint) ( ThreeBits[0][0] << 12 );
Result = Result | (uint) ( ThreeBits[0][1] << 15 );
Result = Result | (uint) ( ThreeBits[0][2] << 18 );
Result = Result | (uint) ( ThreeBits[0][3] << 21 );
return Result;
}
#endregion Helpers
#region String Representations
private static string GetDescriptionFromFile( string filename )
{
return "\n--> Header of " + filename +
"\nID: " + idString +
"\nSize: " + dwSize +
"\nFlags: " + dwFlags + " (" + (eDDSD) dwFlags + ")" +
"\nHeight: " + dwHeight +
"\nWidth: " + dwWidth +
"\nPitch: " + dwPitchOrLinearSize +
"\nDepth: " + dwDepth +
"\nMipMaps: " + dwMipMapCount +
"\n\n---PixelFormat---" + filename +
"\nSize: " + pfSize +
"\nFlags: " + pfFlags + " (" + (eDDPF) pfFlags + ")" +
"\nFourCC: " + pfFourCC + " (" + (eFOURCC) pfFourCC + ")" +
#if READALL
"\nBitcount: " + pfRGBBitCount +
"\nBitMask Red: " + pfRBitMask +
"\nBitMask Green: " + pfGBitMask +
"\nBitMask Blue: " + pfBBitMask +
"\nBitMask Alpha: " + pfABitMask +
#endif
"\n\n---Capabilities---" + filename +
"\nCaps1: " + dwCaps1 + " (" + (eDDSCAPS) dwCaps1 + ")" +
"\nCaps2: " + dwCaps2 + " (" + (eDDSCAPS2) dwCaps2 + ")";
}
private static string GetDescriptionFromMemory( string filename, TextureTarget Dimension )
{
return "\nFile: " + filename +
"\nDimension: " + Dimension +
"\nSize: " + _Width + " * " + _Height + " * " + _Depth +
"\nCompressed: " + _IsCompressed +
"\nBytes for Main Image: " + _BytesForMainSurface +
"\nMipMaps: " + _MipMapCount;
}
#endregion String Representations
}
}
|
