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source: downloads/RenderSystems/GL/src/OgreGLTexture.cpp @ 3

Last change on this file since 3 was 3, checked in by anonymous, 17 years ago
=update
File size: 12.7 KB

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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 "OgreGLTexture.h"
31	#include "OgreGLSupport.h"
32	#include "OgreGLPixelFormat.h"
33	#include "OgreGLHardwarePixelBuffer.h"
34
35	#include "OgreTextureManager.h"
36	#include "OgreImage.h"
37	#include "OgreLogManager.h"
38	#include "OgreCamera.h"
39	#include "OgreException.h"
40	#include "OgreRoot.h"
41	#include "OgreCodec.h"
42	#include "OgreImageCodec.h"
43	#include "OgreStringConverter.h"
44	#include "OgreBitwise.h"
45
46	#include "OgreGLFBORenderTexture.h"
47
48	#if OGRE_PLATFORM == OGRE_PLATFORM_WIN32
49	# include <windows.h>
50	# include <wingdi.h>
51	#endif
52
53	namespace Ogre {
54
55
56
57	GLTexture::GLTexture(ResourceManager* creator, const String& name,
58	ResourceHandle handle, const String& group, bool isManual,
59	ManualResourceLoader* loader, GLSupport& support)
60	: Texture(creator, name, handle, group, isManual, loader),
61	mTextureID(0), mGLSupport(support)
62	{
63	}
64
65
66	GLTexture::~GLTexture()
67	{
68	// have to call this here reather than in Resource destructor
69	// since calling virtual methods in base destructors causes crash
70	if (isLoaded())
71	{
72	unload();
73	}
74	else
75	{
76	freeInternalResources();
77	}
78	}
79
80	GLenum GLTexture::getGLTextureTarget(void) const
81	{
82	switch(mTextureType)
83	{
84	case TEX_TYPE_1D:
85	return GL_TEXTURE_1D;
86	case TEX_TYPE_2D:
87	return GL_TEXTURE_2D;
88	case TEX_TYPE_3D:
89	return GL_TEXTURE_3D;
90	case TEX_TYPE_CUBE_MAP:
91	return GL_TEXTURE_CUBE_MAP;
92	default:
93	return 0;
94	};
95	}
96
97	//* Creation / loading methods ********************************************
98	void GLTexture::createInternalResourcesImpl(void)
99	{
100	// Convert to nearest power-of-two size if required
101	mWidth = GLPixelUtil::optionalPO2(mWidth);
102	mHeight = GLPixelUtil::optionalPO2(mHeight);
103	mDepth = GLPixelUtil::optionalPO2(mDepth);
104
105
106	// Adjust format if required
107	mFormat = TextureManager::getSingleton().getNativeFormat(mTextureType, mFormat, mUsage);
108
109	// Check requested number of mipmaps
110	size_t maxMips = GLPixelUtil::getMaxMipmaps(mWidth, mHeight, mDepth, mFormat);
111	mNumMipmaps = mNumRequestedMipmaps;
112	if(mNumMipmaps>maxMips)
113	mNumMipmaps = maxMips;
114
115	// Generate texture name
116	glGenTextures( 1, &mTextureID );
117
118	// Set texture type
119	glBindTexture( getGLTextureTarget(), mTextureID );
120
121	// This needs to be set otherwise the texture doesn't get rendered
122	glTexParameteri( getGLTextureTarget(), GL_TEXTURE_MAX_LEVEL, mNumMipmaps );
123
124	// Set some misc default parameters so NVidia won't complain, these can of course be changed later
125	glTexParameteri(getGLTextureTarget(), GL_TEXTURE_MIN_FILTER, GL_NEAREST);
126	glTexParameteri(getGLTextureTarget(), GL_TEXTURE_MAG_FILTER, GL_NEAREST);
127	glTexParameteri(getGLTextureTarget(), GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
128	glTexParameteri(getGLTextureTarget(), GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
129
130	// If we can do automip generation and the user desires this, do so
131	mMipmapsHardwareGenerated =
132	Root::getSingleton().getRenderSystem()->getCapabilities()->hasCapability(RSC_AUTOMIPMAP);
133	if((mUsage & TU_AUTOMIPMAP) &&
134	mNumRequestedMipmaps && mMipmapsHardwareGenerated)
135	{
136	glTexParameteri( getGLTextureTarget(), GL_GENERATE_MIPMAP, GL_TRUE );
137	}
138
139	// Allocate internal buffer so that glTexSubImageXD can be used
140	// Internal format
141	GLenum format = GLPixelUtil::getClosestGLInternalFormat(mFormat);
142	size_t width = mWidth;
143	size_t height = mHeight;
144	size_t depth = mDepth;
145	#if 0
146	/** Luckily, this hack seems not to be needed; empty compressed textures can very well be created the
147	conventional way with glTexImageXD.
148	*/
149	if(PixelUtil::isCompressed(mFormat))
150	{
151	// Compressed formats
152	size_t size = PixelUtil::getMemorySize(mWidth, mHeight, mDepth, mFormat);
153	// Provide temporary buffer filled with zeroes as glCompressedTexImageXD does not
154	// accept a 0 pointer like normal glTexImageXD
155	// Run through this process for every mipmap to pregenerate mipmap piramid
156	uint8 *tmpdata = new uint8[size];
157	memset(tmpdata, 0, size);
158
159	for(size_t mip=0; mip<=mNumMipmaps; mip++)
160	{
161	size = PixelUtil::getMemorySize(width, height, depth, mFormat);
162	switch(mTextureType)
163	{
164	case TEX_TYPE_1D:
165	glCompressedTexImage1DARB(GL_TEXTURE_1D, mip, format,
166	width, 0,
167	size, tmpdata);
168	break;
169	case TEX_TYPE_2D:
170	glCompressedTexImage2DARB(GL_TEXTURE_2D, mip, format,
171	width, height, 0,
172	size, tmpdata);
173	break;
174	case TEX_TYPE_3D:
175	glCompressedTexImage3DARB(GL_TEXTURE_3D, mip, format,
176	width, height, depth, 0,
177	size, tmpdata);
178	break;
179	case TEX_TYPE_CUBE_MAP:
180	for(int face=0; face<6; face++) {
181	glCompressedTexImage2DARB(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, mip, format,
182	width, height, 0,
183	size, tmpdata);
184	}
185	break;
186	};
187	if(width>1) width = width/2;
188	if(height>1) height = height/2;
189	if(depth>1) depth = depth/2;
190	}
191	delete [] tmpdata;
192	}
193	else
194	#endif
195	{
196	// Run through this process to pregenerate mipmap piramid
197	for(size_t mip=0; mip<=mNumMipmaps; mip++)
198	{
199	// Normal formats
200	switch(mTextureType)
201	{
202	case TEX_TYPE_1D:
203	glTexImage1D(GL_TEXTURE_1D, mip, format,
204	width, 0,
205	GL_RGBA, GL_UNSIGNED_BYTE, 0);
206
207	break;
208	case TEX_TYPE_2D:
209	glTexImage2D(GL_TEXTURE_2D, mip, format,
210	width, height, 0,
211	GL_RGBA, GL_UNSIGNED_BYTE, 0);
212	break;
213	case TEX_TYPE_3D:
214	glTexImage3D(GL_TEXTURE_3D, mip, format,
215	width, height, depth, 0,
216	GL_RGBA, GL_UNSIGNED_BYTE, 0);
217	break;
218	case TEX_TYPE_CUBE_MAP:
219	for(int face=0; face<6; face++) {
220	glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, mip, format,
221	width, height, 0,
222	GL_RGBA, GL_UNSIGNED_BYTE, 0);
223	}
224	break;
225	};
226	if(width>1) width = width/2;
227	if(height>1) height = height/2;
228	if(depth>1) depth = depth/2;
229	}
230	}
231	_createSurfaceList();
232	// Get final internal format
233	mFormat = getBuffer(0,0)->getFormat();
234	}
235
236	void GLTexture::createRenderTexture(void)
237	{
238	// Create the GL texture
239	// This already does everything neccessary
240	createInternalResources();
241	}
242
243	void GLTexture::loadImpl()
244	{
245	if( mUsage & TU_RENDERTARGET )
246	{
247	createRenderTexture();
248	}
249	else
250	{
251	String baseName, ext;
252	size_t pos = mName.find_last_of(".");
253	if( pos == String::npos )
254	OGRE_EXCEPT(
255	Exception::ERR_INVALIDPARAMS,
256	"Unable to load image file '"+ mName + "' - invalid extension.",
257	"GLTexture::loadImpl" );
258
259	baseName = mName.substr(0, pos);
260	ext = mName.substr(pos+1);
261
262	if(mTextureType == TEX_TYPE_1D \|\| mTextureType == TEX_TYPE_2D \|\|
263	mTextureType == TEX_TYPE_3D)
264	{
265	Image img;
266	// find & load resource data intro stream to allow resource
267	// group changes if required
268	DataStreamPtr dstream =
269	ResourceGroupManager::getSingleton().openResource(
270	mName, mGroup, true, this);
271
272	img.load(dstream, ext);
273
274	// If this is a cube map, set the texture type flag accordingly.
275	if (img.hasFlag(IF_CUBEMAP))
276	mTextureType = TEX_TYPE_CUBE_MAP;
277	// If this is a volumetric texture set the texture type flag accordingly.
278	if(img.getDepth() > 1)
279	mTextureType = TEX_TYPE_3D;
280
281	// Call internal _loadImages, not loadImage since that's external and
282	// will determine load status etc again
283	ConstImagePtrList imagePtrs;
284	imagePtrs.push_back(&img);
285	_loadImages( imagePtrs );
286	}
287	else if (mTextureType == TEX_TYPE_CUBE_MAP)
288	{
289	if(StringUtil::endsWith(getName(), ".dds"))
290	{
291	// XX HACK there should be a better way to specify whether
292	// all faces are in the same file or not
293	Image img;
294	// find & load resource data intro stream to allow resource
295	// group changes if required
296	DataStreamPtr dstream =
297	ResourceGroupManager::getSingleton().openResource(
298	mName, mGroup, true, this);
299
300	img.load(dstream, ext);
301	// Call internal _loadImages, not loadImage since that's external and
302	// will determine load status etc again
303	ConstImagePtrList imagePtrs;
304	imagePtrs.push_back(&img);
305	_loadImages( imagePtrs );
306	}
307	else
308	{
309	std::vector<Image> images(6);
310	ConstImagePtrList imagePtrs;
311	static const String suffixes[6] = {"_rt", "_lf", "_up", "_dn", "_fr", "_bk"};
312
313	for(size_t i = 0; i < 6; i++)
314	{
315	String fullName = baseName + suffixes[i] + "." + ext;
316	// find & load resource data intro stream to allow resource
317	// group changes if required
318	DataStreamPtr dstream =
319	ResourceGroupManager::getSingleton().openResource(
320	fullName, mGroup, true, this);
321
322	images[i].load(dstream, ext);
323	imagePtrs.push_back(&images[i]);
324	}
325
326	_loadImages( imagePtrs );
327	}
328	}
329	else
330	OGRE_EXCEPT( Exception::ERR_NOT_IMPLEMENTED, "** Unknown texture type **", "GLTexture::load" );
331	}
332	}
333
334	//*************************************************************************
335
336	void GLTexture::freeInternalResourcesImpl()
337	{
338	mSurfaceList.clear();
339	glDeleteTextures( 1, &mTextureID );
340	}
341
342
343	//---------------------------------------------------------------------------------------------
344	void GLTexture::_createSurfaceList()
345	{
346	mSurfaceList.clear();
347
348	// For all faces and mipmaps, store surfaces as HardwarePixelBufferSharedPtr
349	bool wantGeneratedMips = (mUsage & TU_AUTOMIPMAP)!=0;
350
351	// Do mipmapping in software? (uses GLU) For some cards, this is still needed. Of course,
352	// only when mipmap generation is desired.
353	bool doSoftware = wantGeneratedMips && !mMipmapsHardwareGenerated && getNumMipmaps();
354
355	for(size_t face=0; face<getNumFaces(); face++)
356	{
357	for(size_t mip=0; mip<=getNumMipmaps(); mip++)
358	{
359	GLHardwarePixelBuffer *buf = new GLTextureBuffer(mName, getGLTextureTarget(), mTextureID, face, mip,
360	static_cast<HardwareBuffer::Usage>(mUsage), doSoftware && mip==0);
361	mSurfaceList.push_back(HardwarePixelBufferSharedPtr(buf));
362
363	/// Check for error
364	if(buf->getWidth()==0 \|\| buf->getHeight()==0 \|\| buf->getDepth()==0)
365	{
366	OGRE_EXCEPT(
367	Exception::ERR_RENDERINGAPI_ERROR,
368	"Zero sized texture surface on texture "+getName()+
369	" face "+StringConverter::toString(face)+
370	" mipmap "+StringConverter::toString(mip)+
371	". Probably, the GL driver refused to create the texture.",
372	"GLTexture::_createSurfaceList");
373	}
374	}
375	}
376	}
377
378	//---------------------------------------------------------------------------------------------
379	HardwarePixelBufferSharedPtr GLTexture::getBuffer(size_t face, size_t mipmap)
380	{
381	if(face >= getNumFaces())
382	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Face index out of range",
383	"GLTexture::getBuffer");
384	if(mipmap > mNumMipmaps)
385	OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, "Mipmap index out of range",
386	"GLTexture::getBuffer");
387	unsigned int idx = face*(mNumMipmaps+1) + mipmap;
388	assert(idx < mSurfaceList.size());
389	return mSurfaceList[idx];
390	}
391
392	}
393

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