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OgreDDSCodec.cpp @ 44

Last change on this file since 44 was 5, checked in by anonymous, 17 years ago
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1	/*
2	-----------------------------------------------------------------------------
3	This source file is part of OGRE
4	(Object-oriented Graphics Rendering Engine)
5	For the latest info, see http://www.ogre3d.org/
6
7	Copyright (c) 2000-2006 Torus Knot Software Ltd
8	Also see acknowledgements in Readme.html
9
10	This program is free software; you can redistribute it and/or modify it under
11	the terms of the GNU Lesser General Public License as published by the Free Software
12	Foundation; either version 2 of the License, or (at your option) any later
13	version.
14
15	This program is distributed in the hope that it will be useful, but WITHOUT
16	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17	FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19	You should have received a copy of the GNU Lesser General Public License along with
20	this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21	Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22	http://www.gnu.org/copyleft/lesser.txt.
23
24	You may alternatively use this source under the terms of a specific version of
25	the OGRE Unrestricted License provided you have obtained such a license from
26	Torus Knot Software Ltd.
27	-----------------------------------------------------------------------------
28	*/
29
30	#include "OgreStableHeaders.h"
31
32	#include "OgreRoot.h"
33	#include "OgreRenderSystem.h"
34	#include "OgreDDSCodec.h"
35	#include "OgreImage.h"
36	#include "OgreException.h"
37
38	#include "OgreLogManager.h"
39	#include "OgreStringConverter.h"
40
41
42	namespace Ogre {
43	// Internal DDS structure definitions
44	#define FOURCC(c0, c1, c2, c3) (c0 \| (c1 << 8) \| (c2 << 16) \| (c3 << 24))
45
46	#if OGRE_COMPILER == OGRE_COMPILER_MSVC
47	#pragma pack (push, 1)
48	#else
49	#pragma pack (1)
50	#endif
51
52	// Nested structure
53	struct DDSPixelFormat
54	{
55	uint32 size;
56	uint32 flags;
57	uint32 fourCC;
58	uint32 rgbBits;
59	uint32 redMask;
60	uint32 greenMask;
61	uint32 blueMask;
62	uint32 alphaMask;
63	};
64
65	// Nested structure
66	struct DDSCaps
67	{
68	uint32 caps1;
69	uint32 caps2;
70	uint32 reserved[2];
71	};
72	// Main header, note preceded by 'DDS '
73	struct DDSHeader
74	{
75	uint32 size;
76	uint32 flags;
77	uint32 height;
78	uint32 width;
79	uint32 sizeOrPitch;
80	uint32 depth;
81	uint32 mipMapCount;
82	uint32 reserved1[11];
83	DDSPixelFormat pixelFormat;
84	DDSCaps caps;
85	uint32 reserved2;
86	};
87
88	// An 8-byte DXT colour block, represents a 4x4 texel area. Used by all DXT formats
89	struct DXTColourBlock
90	{
91	// 2 colour ranges
92	uint16 colour_0;
93	uint16 colour_1;
94	// 16 2-bit indexes, each byte here is one row
95	uint8 indexRow[4];
96	};
97	// An 8-byte DXT explicit alpha block, represents a 4x4 texel area. Used by DXT2/3
98	struct DXTExplicitAlphaBlock
99	{
100	// 16 4-bit values, each 16-bit value is one row
101	uint16 alphaRow[4];
102	};
103	// An 8-byte DXT interpolated alpha block, represents a 4x4 texel area. Used by DXT4/5
104	struct DXTInterpolatedAlphaBlock
105	{
106	// 2 alpha ranges
107	uint8 alpha_0;
108	uint8 alpha_1;
109	// 16 3-bit indexes. Unfortunately 3 bits doesn't map too well to row bytes
110	// so just stored raw
111	uint8 indexes[6];
112	};
113
114	#if OGRE_COMPILER == OGRE_COMPILER_MSVC
115	#pragma pack (pop)
116	#else
117	#pragma pack ()
118	#endif
119
120	const uint32 DDS_PIXELFORMAT_SIZE = 8 * sizeof(uint32);
121	const uint32 DDS_CAPS_SIZE = 4 * sizeof(uint32);
122	const uint32 DDS_HEADER_SIZE = 19 * sizeof(uint32) + DDS_PIXELFORMAT_SIZE + DDS_CAPS_SIZE;
123
124	const uint32 DDSD_CAPS = 0x00000001;
125	const uint32 DDSD_HEIGHT = 0x00000002;
126	const uint32 DDSD_WIDTH = 0x00000004;
127	const uint32 DDSD_PITCH = 0x00000008;
128	const uint32 DDSD_PIXELFORMAT = 0x00001000;
129	const uint32 DDSD_MIPMAPCOUNT = 0x00020000;
130	const uint32 DDSD_LINEARSIZE = 0x00080000;
131	const uint32 DDSD_DEPTH = 0x00800000;
132	const uint32 DDPF_ALPHAPIXELS = 0x00000001;
133	const uint32 DDPF_FOURCC = 0x00000004;
134	const uint32 DDPF_RGB = 0x00000040;
135	const uint32 DDSCAPS_COMPLEX = 0x00000008;
136	const uint32 DDSCAPS_TEXTURE = 0x00001000;
137	const uint32 DDSCAPS_MIPMAP = 0x00400000;
138	const uint32 DDSCAPS2_CUBEMAP = 0x00000200;
139	const uint32 DDSCAPS2_CUBEMAP_POSITIVEX = 0x00000400;
140	const uint32 DDSCAPS2_CUBEMAP_NEGATIVEX = 0x00000800;
141	const uint32 DDSCAPS2_CUBEMAP_POSITIVEY = 0x00001000;
142	const uint32 DDSCAPS2_CUBEMAP_NEGATIVEY = 0x00002000;
143	const uint32 DDSCAPS2_CUBEMAP_POSITIVEZ = 0x00004000;
144	const uint32 DDSCAPS2_CUBEMAP_NEGATIVEZ = 0x00008000;
145	const uint32 DDSCAPS2_VOLUME = 0x00200000;
146
147	// Special FourCC codes
148	const uint32 D3DFMT_R16F = 111;
149	const uint32 D3DFMT_G16R16F = 112;
150	const uint32 D3DFMT_A16B16G16R16F = 113;
151	const uint32 D3DFMT_R32F = 114;
152	const uint32 D3DFMT_G32R32F = 115;
153	const uint32 D3DFMT_A32B32G32R32F = 116;
154
155
156	//---------------------------------------------------------------------
157	DDSCodec* DDSCodec::msInstance = 0;
158	//---------------------------------------------------------------------
159	void DDSCodec::startup(void)
160	{
161	if (!msInstance)
162	{
163
164	LogManager::getSingleton().logMessage(
165	LML_NORMAL,
166	"DDS codec registering");
167
168	msInstance = new DDSCodec();
169	Codec::registerCodec(msInstance);
170	}
171
172	}
173	//---------------------------------------------------------------------
174	void DDSCodec::shutdown(void)
175	{
176	if(msInstance)
177	{
178	Codec::unRegisterCodec(msInstance);
179	delete msInstance;
180	msInstance = 0;
181	}
182
183	}
184	//---------------------------------------------------------------------
185	DDSCodec::DDSCodec():
186	mType("dds")
187	{
188	}
189	//---------------------------------------------------------------------
190	DataStreamPtr DDSCodec::code(MemoryDataStreamPtr& input, Codec::CodecDataPtr& pData) const
191	{
192	OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED,
193	"DDS encoding not supported",
194	"DDSCodec::code" ) ;
195	}
196	//---------------------------------------------------------------------
197	void DDSCodec::codeToFile(MemoryDataStreamPtr& input,
198	const String& outFileName, Codec::CodecDataPtr& pData) const
199	{
200	OGRE_EXCEPT(Exception::ERR_NOT_IMPLEMENTED,
201	"DDS encoding not supported",
202	"DDSCodec::codeToFile" ) ;
203	}
204	//---------------------------------------------------------------------
205	PixelFormat DDSCodec::convertFourCCFormat(uint32 fourcc) const
206	{
207	// convert dxt pixel format
208	switch(fourcc)
209	{
210	case FOURCC('D','X','T','1'):
211	return PF_DXT1;
212	case FOURCC('D','X','T','2'):
213	return PF_DXT2;
214	case FOURCC('D','X','T','3'):
215	return PF_DXT3;
216	case FOURCC('D','X','T','4'):
217	return PF_DXT4;
218	case FOURCC('D','X','T','5'):
219	return PF_DXT5;
220	case D3DFMT_R16F:
221	return PF_FLOAT16_R;
222	case D3DFMT_G16R16F:
223	return PF_FLOAT16_GR;
224	case D3DFMT_A16B16G16R16F:
225	return PF_FLOAT16_RGBA;
226	case D3DFMT_R32F:
227	return PF_FLOAT32_R;
228	case D3DFMT_G32R32F:
229	return PF_FLOAT32_GR;
230	case D3DFMT_A32B32G32R32F:
231	return PF_FLOAT32_RGBA;
232	// We could support 3Dc here, but only ATI cards support it, not nVidia
233	default:
234	OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND,
235	"Unsupported FourCC format found in DDS file",
236	"DDSCodec::decode");
237	};
238
239	}
240	//---------------------------------------------------------------------
241	PixelFormat DDSCodec::convertPixelFormat(uint32 rgbBits, uint32 rMask,
242	uint32 gMask, uint32 bMask, uint32 aMask) const
243	{
244	// General search through pixel formats
245	for (int i = PF_UNKNOWN + 1; i < PF_COUNT; ++i)
246	{
247	PixelFormat pf = static_cast<PixelFormat>(i);
248	if (PixelUtil::getNumElemBits(pf) == rgbBits)
249	{
250	uint32 testMasks[4];
251	PixelUtil::getBitMasks(pf, testMasks);
252	int testBits[4];
253	PixelUtil::getBitDepths(pf, testBits);
254	if (testMasks[0] == rMask && testMasks[1] == gMask &&
255	testMasks[2] == bMask &&
256	// for alpha, deal with 'X8' formats by checking bit counts
257	(testMasks[3] == aMask \|\| (aMask == 0 && testBits[3] == 0)))
258	{
259	return pf;
260	}
261	}
262
263	}
264
265	OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND, "Cannot determine pixel format",
266	"DDSCodec::convertPixelFormat");
267
268	}
269	//---------------------------------------------------------------------
270	void DDSCodec::unpackDXTColour(PixelFormat pf, const DXTColourBlock& block,
271	ColourValue* pCol) const
272	{
273	// Note - we assume all values have already been endian swapped
274
275	// Colour lookup table
276	ColourValue derivedColours[4];
277
278	if (pf == PF_DXT1 && block.colour_0 <= block.colour_1)
279	{
280	// 1-bit alpha
281	PixelUtil::unpackColour(&(derivedColours[0]), PF_R5G6B5, &(block.colour_0));
282	PixelUtil::unpackColour(&(derivedColours[1]), PF_R5G6B5, &(block.colour_1));
283	// one intermediate colour, half way between the other two
284	derivedColours[2] = (derivedColours[0] + derivedColours[1]) / 2;
285	// transparent colour
286	derivedColours[3] = ColourValue::ZERO;
287	}
288	else
289	{
290	PixelUtil::unpackColour(&(derivedColours[0]), PF_R5G6B5, &(block.colour_0));
291	PixelUtil::unpackColour(&(derivedColours[1]), PF_R5G6B5, &(block.colour_1));
292	// first interpolated colour, 1/3 of the way along
293	derivedColours[2] = (2 * derivedColours[0] + derivedColours[1]) / 3;
294	// second interpolated colour, 2/3 of the way along
295	derivedColours[3] = (derivedColours[0] + 2 * derivedColours[1]) / 3;
296	}
297
298	// Process 4x4 block of texels
299	for (size_t row = 0; row < 4; ++row)
300	{
301	for (size_t x = 0; x < 4; ++x)
302	{
303	// LSB come first
304	uint8 colIdx = static_cast<uint8>(block.indexRow[row] >> (x * 2) & 0x3);
305	if (pf == PF_DXT1)
306	{
307	// Overwrite entire colour
308	pCol[(row * 4) + x] = derivedColours[colIdx];
309	}
310	else
311	{
312	// alpha has already been read (alpha precedes colour)
313	ColourValue& col = pCol[(row * 4) + x];
314	col.r = derivedColours[colIdx].r;
315	col.g = derivedColours[colIdx].g;
316	col.b = derivedColours[colIdx].b;
317	}
318	}
319
320	}
321
322
323	}
324	//---------------------------------------------------------------------
325	void DDSCodec::unpackDXTAlpha(
326	const DXTExplicitAlphaBlock& block, ColourValue* pCol) const
327	{
328	// Note - we assume all values have already been endian swapped
329
330	// This is an explicit alpha block, 4 bits per pixel, LSB first
331	for (size_t row = 0; row < 4; ++row)
332	{
333	for (size_t x = 0; x < 4; ++x)
334	{
335	// Shift and mask off to 4 bits
336	uint8 val = static_cast<uint8>(block.alphaRow[row] >> (x * 4) & 0xF);
337	// Convert to [0,1]
338	pCol->a = (Real)val / (Real)0xF;
339	pCol++;
340
341	}
342
343	}
344
345	}
346	//---------------------------------------------------------------------
347	void DDSCodec::unpackDXTAlpha(
348	const DXTInterpolatedAlphaBlock& block, ColourValue* pCol) const
349	{
350	// 8 derived alpha values to be indexed
351	Real derivedAlphas[8];
352
353	// Explicit extremes
354	derivedAlphas[0] = block.alpha_0 / (Real)0xFF;
355	derivedAlphas[1] = block.alpha_1 / (Real)0xFF;
356
357
358	if (block.alpha_0 <= block.alpha_1)
359	{
360	// 4 interpolated alphas, plus zero and one
361	// full range including extremes at [0] and [5]
362	// we want to fill in [1] through [4] at weights ranging
363	// from 1/5 to 4/5
364	Real denom = 1.0f / 5.0f;
365	for (size_t i = 0; i < 4; ++i)
366	{
367	Real factor0 = (4 - i) * denom;
368	Real factor1 = (i + 1) * denom;
369	derivedAlphas[i + 2] =
370	(factor0 * block.alpha_0) + (factor1 * block.alpha_1);
371	}
372	derivedAlphas[6] = 0.0f;
373	derivedAlphas[7] = 1.0f;
374
375	}
376	else
377	{
378	// 6 interpolated alphas
379	// full range including extremes at [0] and [7]
380	// we want to fill in [1] through [6] at weights ranging
381	// from 1/7 to 6/7
382	Real denom = 1.0f / 7.0f;
383	for (size_t i = 0; i < 6; ++i)
384	{
385	Real factor0 = (6 - i) * denom;
386	Real factor1 = (i + 1) * denom;
387	derivedAlphas[i + 2] =
388	(factor0 * block.alpha_0) + (factor1 * block.alpha_1);
389	}
390
391	}
392
393	// Ok, now we've built the reference values, process the indexes
394	for (size_t i = 0; i < 16; ++i)
395	{
396	size_t baseByte = (i * 3) / 8;
397	size_t baseBit = (i * 3) % 8;
398	uint8 bits = static_cast<uint8>(block.indexes[baseByte] >> baseBit & 0x7);
399	// do we need to stitch in next byte too?
400	if (baseBit > 5)
401	{
402	uint8 extraBits = static_cast<uint8>(
403	(block.indexes[baseByte+1] << (8 - baseBit)) & 0xFF);
404	bits \|= extraBits & 0x7;
405	}
406	pCol[i].a = derivedAlphas[bits];
407
408	}
409
410	}
411	//---------------------------------------------------------------------
412	Codec::DecodeResult DDSCodec::decode(DataStreamPtr& stream) const
413	{
414	// Read 4 character code
415	uint32 fileType;
416	stream->read(&fileType, sizeof(uint32));
417	flipEndian(&fileType, sizeof(uint32), 1);
418
419	if (FOURCC('D', 'D', 'S', ' ') != fileType)
420	{
421	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
422	"This is not a DDS file!", "DDSCodec::decode");
423	}
424
425	// Read header in full
426	DDSHeader header;
427	stream->read(&header, sizeof(DDSHeader));
428
429	// Endian flip if required, all 32-bit values
430	flipEndian(&header, 4, sizeof(DDSHeader) / 4);
431
432	// Check some sizes
433	if (header.size != DDS_HEADER_SIZE)
434	{
435	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
436	"DDS header size mismatch!", "DDSCodec::decode");
437	}
438	if (header.pixelFormat.size != DDS_PIXELFORMAT_SIZE)
439	{
440	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS,
441	"DDS header size mismatch!", "DDSCodec::decode");
442	}
443
444	ImageData* imgData = new ImageData();
445	MemoryDataStreamPtr output;
446
447	imgData->depth = 1; // (deal with volume later)
448	imgData->width = header.width;
449	imgData->height = header.height;
450	size_t numFaces = 1; // assume one face until we know otherwise
451
452	if (header.caps.caps1 & DDSCAPS_MIPMAP)
453	{
454	imgData->num_mipmaps = header.mipMapCount - 1;
455	}
456	else
457	{
458	imgData->num_mipmaps = 0;
459	}
460	imgData->flags = 0;
461
462	bool decompressDXT = false;
463	// Figure out basic image type
464	if (header.caps.caps2 & DDSCAPS2_CUBEMAP)
465	{
466	imgData->flags \|= IF_CUBEMAP;
467	numFaces = 6;
468	}
469	else if (header.caps.caps2 & DDSCAPS2_VOLUME)
470	{
471	imgData->flags \|= IF_3D_TEXTURE;
472	imgData->depth = header.depth;
473	}
474	// Pixel format
475	PixelFormat sourceFormat = PF_UNKNOWN;
476
477	if (header.pixelFormat.flags & DDPF_FOURCC)
478	{
479	sourceFormat = convertFourCCFormat(header.pixelFormat.fourCC);
480	}
481	else
482	{
483	sourceFormat = convertPixelFormat(header.pixelFormat.rgbBits,
484	header.pixelFormat.redMask, header.pixelFormat.greenMask,
485	header.pixelFormat.blueMask,
486	header.pixelFormat.flags & DDPF_ALPHAPIXELS ?
487	header.pixelFormat.alphaMask : 0);
488	}
489
490	if (PixelUtil::isCompressed(sourceFormat))
491	{
492	if (!Root::getSingleton().getRenderSystem()->getCapabilities()
493	->hasCapability(RSC_TEXTURE_COMPRESSION_DXT))
494	{
495	// We'll need to decompress
496	decompressDXT = true;
497	// Convert format
498	switch (sourceFormat)
499	{
500	case PF_DXT1:
501	// source can be either 565 or 5551 depending on whether alpha present
502	// unfortunately you have to read a block to figure out which
503	// Note that we upgrade to 32-bit pixel formats here, even
504	// though the source is 16-bit; this is because the interpolated
505	// values will benefit from the 32-bit results, and the source
506	// from which the 16-bit samples are calculated may have been
507	// 32-bit so can benefit from this.
508	DXTColourBlock block;
509	stream->read(&block, sizeof(DXTColourBlock));
510	flipEndian(&(block.colour_0), sizeof(uint16), 1);
511	flipEndian(&(block.colour_1), sizeof(uint16), 1);
512	// skip back since we'll need to read this again
513	stream->skip(0 - sizeof(DXTColourBlock));
514	// colour_0 <= colour_1 means transparency in DXT1
515	if (block.colour_0 <= block.colour_1)
516	{
517	imgData->format = PF_BYTE_RGBA;
518	}
519	else
520	{
521	imgData->format = PF_BYTE_RGB;
522	}
523	break;
524	case PF_DXT2:
525	case PF_DXT3:
526	case PF_DXT4:
527	case PF_DXT5:
528	// full alpha present, formats vary only in encoding
529	imgData->format = PF_BYTE_RGBA;
530	break;
531	default:
532	// all other cases need no special format handling
533	break;
534	}
535	}
536	else
537	{
538	// Use original format
539	imgData->format = sourceFormat;
540	// Keep DXT data compressed
541	imgData->flags \|= IF_COMPRESSED;
542	}
543	}
544	else // not compressed
545	{
546	// Don't test against DDPF_RGB since greyscale DDS doesn't set this
547	// just derive any other kind of format
548	imgData->format = sourceFormat;
549	}
550
551	// Calculate total size from number of mipmaps, faces and size
552	imgData->size = Image::calculateSize(imgData->num_mipmaps, numFaces,
553	imgData->width, imgData->height, imgData->depth, imgData->format);
554
555	// Bind output buffer
556	output.bind(new MemoryDataStream(imgData->size));
557
558
559	// Now deal with the data
560	void* destPtr = output->getPtr();
561
562	// all mips for a face, then each face
563	for(size_t i = 0; i < numFaces; ++i)
564	{
565	size_t width = imgData->width;
566	size_t height = imgData->height;
567	size_t depth = imgData->depth;
568
569	for(size_t mip = 0; mip <= imgData->num_mipmaps; ++mip)
570	{
571	size_t dstPitch = width * PixelUtil::getNumElemBytes(imgData->format);
572
573	if (PixelUtil::isCompressed(sourceFormat))
574	{
575	// Compressed data
576	if (decompressDXT)
577	{
578	DXTColourBlock col;
579	DXTInterpolatedAlphaBlock iAlpha;
580	DXTExplicitAlphaBlock eAlpha;
581	// 4x4 block of decompressed colour
582	ColourValue tempColours[16];
583	size_t destBpp = PixelUtil::getNumElemBytes(imgData->format);
584	size_t destPitchMinus4 = dstPitch - destBpp * 4;
585	// slices are done individually
586	for(size_t z = 0; z < depth; ++z)
587	{
588	// 4x4 blocks in x/y
589	for (size_t y = 0; y < height; y += 4)
590	{
591	for (size_t x = 0; x < width; x += 4)
592	{
593	if (sourceFormat == PF_DXT2 \|\|
594	sourceFormat == PF_DXT3)
595	{
596	// explicit alpha
597	stream->read(&eAlpha, sizeof(DXTExplicitAlphaBlock));
598	flipEndian(eAlpha.alphaRow, sizeof(uint16), 4);
599	unpackDXTAlpha(eAlpha, tempColours) ;
600	}
601	else if (sourceFormat == PF_DXT4 \|\|
602	sourceFormat == PF_DXT5)
603	{
604	// interpolated alpha
605	stream->read(&iAlpha, sizeof(DXTInterpolatedAlphaBlock));
606	flipEndian(&(iAlpha.alpha_0), sizeof(uint16), 1);
607	flipEndian(&(iAlpha.alpha_1), sizeof(uint16), 1);
608	unpackDXTAlpha(iAlpha, tempColours) ;
609	}
610	// always read colour
611	stream->read(&col, sizeof(DXTColourBlock));
612	flipEndian(&(col.colour_0), sizeof(uint16), 1);
613	flipEndian(&(col.colour_1), sizeof(uint16), 1);
614	unpackDXTColour(sourceFormat, col, tempColours);
615
616	// write 4x4 block to uncompressed version
617	for (size_t by = 0; by < 4; ++by)
618	{
619	for (size_t bx = 0; bx < 4; ++bx)
620	{
621	PixelUtil::packColour(tempColours[by*4+bx],
622	imgData->format, destPtr);
623	destPtr = static_cast<void*>(
624	static_cast<uchar*>(destPtr) + destBpp);
625	}
626	// advance to next row
627	destPtr = static_cast<void*>(
628	static_cast<uchar*>(destPtr) + destPitchMinus4);
629	}
630	// next block. Our dest pointer is 4 lines down
631	// from where it started
632	if (x + 4 == width)
633	{
634	// Jump back to the start of the line
635	destPtr = static_cast<void*>(
636	static_cast<uchar*>(destPtr) - destPitchMinus4);
637	}
638	else
639	{
640	// Jump back up 4 rows and 4 pixels to the
641	// right to be at the next block to the right
642	destPtr = static_cast<void*>(
643	static_cast<uchar>(destPtr) - dstPitch 4 + destBpp * 4);
644
645	}
646
647	}
648
649	}
650	}
651
652	}
653	else
654	{
655	// load directly
656	// DDS format lies! sizeOrPitch is not always set for DXT!!
657	size_t dxtSize = PixelUtil::getMemorySize(width, height, depth, imgData->format);
658	stream->read(destPtr, dxtSize);
659	destPtr = static_cast<void>(static_cast<uchar>(destPtr) + dxtSize);
660	}
661
662	}
663	else
664	{
665	// Final data - trim incoming pitch
666	size_t srcPitch;
667	if (header.flags & DDSD_PITCH)
668	{
669	srcPitch = header.sizeOrPitch /
670	std::max((size_t)1, mip * 2);
671	}
672	else
673	{
674	// assume same as final pitch
675	srcPitch = dstPitch;
676	}
677	assert (dstPitch <= srcPitch);
678	long srcAdvance = static_cast<long>(srcPitch) - static_cast<long>(dstPitch);
679
680	for (size_t z = 0; z < imgData->depth; ++z)
681	{
682	for (size_t y = 0; y < imgData->height; ++y)
683	{
684	stream->read(destPtr, dstPitch);
685	if (srcAdvance > 0)
686	stream->skip(srcAdvance);
687
688	destPtr = static_cast<void>(static_cast<uchar>(destPtr) + dstPitch);
689	}
690	}
691
692	}
693
694
695	/// Next mip
696	if(width!=1) width /= 2;
697	if(height!=1) height /= 2;
698	if(depth!=1) depth /= 2;
699	}
700
701	}
702
703	DecodeResult ret;
704	ret.first = output;
705	ret.second = CodecDataPtr(imgData);
706	return ret;
707
708
709
710	}
711	//---------------------------------------------------------------------
712	String DDSCodec::getType() const
713	{
714	return mType;
715	}
716	//---------------------------------------------------------------------
717	void DDSCodec::flipEndian(void * pData, size_t size, size_t count) const
718	{
719	#if OGRE_ENDIAN == OGRE_ENDIAN_BIG
720	for(unsigned int index = 0; index < count; index++)
721	{
722	flipEndian((void )((long)pData + (index size)), size);
723	}
724	#endif
725	}
726	//---------------------------------------------------------------------
727	void DDSCodec::flipEndian(void * pData, size_t size) const
728	{
729	#if OGRE_ENDIAN == OGRE_ENDIAN_BIG
730	char swapByte;
731	for(unsigned int byteIndex = 0; byteIndex < size/2; byteIndex++)
732	{
733	swapByte = (char )((long)pData + byteIndex);
734	(char )((long)pData + byteIndex) = (char )((long)pData + size - byteIndex - 1);
735	(char )((long)pData + size - byteIndex - 1) = swapByte;
736	}
737	#endif
738	}
739
740	}
741

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source: downloads/ogre/OgreMain/src/OgreDDSCodec.cpp @ 44

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