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source: code/archive/tutorialHS09/src/external/ogreceguirenderer/OgreCEGUITexture.cpp @ 9179

Last change on this file since 9179 was 5738, checked in by landauf, 15 years ago

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1/************************************************************************
2        filename:       OgreCEGUITexture.cpp
3        created:        11/5/2004
4        author:         Paul D Turner
5       
6        purpose:        Implementation of Texture using Ogre engine
7*************************************************************************/
8/*************************************************************************
9    Crazy Eddie's GUI System (http://www.cegui.org.uk)
10    Copyright (C)2004 - 2005 Paul D Turner (paul@cegui.org.uk)
11
12    This library is free software; you can redistribute it and/or
13    modify it under the terms of the GNU Lesser General Public
14    License as published by the Free Software Foundation; either
15    version 2.1 of the License, or (at your option) any later version.
16
17    This library is distributed in the hope that it will be useful,
18    but WITHOUT ANY WARRANTY; without even the implied warranty of
19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
20    Lesser General Public License for more details.
21
22    You should have received a copy of the GNU Lesser General Public
23    License along with this library; if not, write to the Free Software
24    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
25*************************************************************************/
26
27#include <CEGUISystem.h>
28#include <CEGUIExceptions.h>
29#include "OgreCEGUITexture.h"
30#include "OgreCEGUIRenderer.h"
31
32#include <OgreTextureManager.h>
33
34// Start of CEGUI namespace section
35namespace CEGUI
36{
37/*************************************************************************
38        Static data definition / initialisation
39*************************************************************************/
40uint32 OgreCEGUITexture::d_texturenumber                = 0;
41
42
43/*************************************************************************
44        Constructor
45*************************************************************************/
46OgreCEGUITexture::OgreCEGUITexture(Renderer* owner) :
47        Texture(owner)
48{
49        d_ogre_texture.setNull();
50        d_isLinked = false;
51}
52
53
54/*************************************************************************
55        Destructor
56*************************************************************************/
57OgreCEGUITexture::~OgreCEGUITexture(void)
58{
59        freeOgreTexture();
60}
61
62
63/*************************************************************************
64        Loads the specified image file into the texture.  The texture is
65        resized as required to hold the image. 
66*************************************************************************/
67void OgreCEGUITexture::loadFromFile(const String& filename, const String& resourceGroup)
68{
69        using namespace Ogre;
70
71        // unload old ogre texture
72        freeOgreTexture();
73
74        // create / load a new ogre texture from the specified image
75        try
76        {
77                TextureManager& textureManager = TextureManager::getSingleton();
78
79                // see if texture already exists
80                Ogre::TexturePtr ogreTexture = (Ogre::TexturePtr)textureManager.getByName(filename.c_str());
81
82                if (!ogreTexture.isNull())
83                {
84                        // texture already exists, so create a 'linked' texture (ensures texture is not destroyed twice)
85                        d_ogre_texture = ogreTexture;
86                        d_isLinked = true;
87                }
88                // texture does not already exist, so load it in
89                else
90                {
91            String orpGroup;
92            if (resourceGroup.empty())
93            {
94                const String& defGrp = CEGUI::System::getSingleton().getResourceProvider()->getDefaultResourceGroup();
95                orpGroup = defGrp.empty() ? Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME.c_str() : defGrp;
96            }
97            else
98            {
99                orpGroup = resourceGroup;
100            }
101
102                        d_ogre_texture = TextureManager::getSingleton().load(filename.c_str(), orpGroup.c_str(), TEX_TYPE_2D, 0, 1.0f);
103                        d_isLinked = false;
104                }
105
106        }
107        catch(Ogre::Exception e)
108        {
109                throw RendererException((utf8*)"Failed to create Texture object from file '" + filename + "'. Additional Information:\n" + e.getFullDescription().c_str());
110        }
111
112        // if we got a pointer cache some details
113        if (!d_ogre_texture.isNull())
114        {
115                d_width         = d_ogre_texture->getWidth();
116                d_height        = d_ogre_texture->getHeight();
117        }
118        // no texture from image so throw.
119        else
120        {
121                throw RendererException((utf8*)"Failed to create Texture object from file '" + filename + "'.  Ogre returned a NULL pointer.");
122        }
123
124}
125
126
127/*************************************************************************
128        Loads (copies) an image in memory into the texture.  The texture is
129        resized as required to hold the image. 
130*************************************************************************/
131
132void _byteSwap(unsigned char* b, int n)
133{
134    register int i = 0;
135    register int j = n-1;
136    while (i<j)
137    {
138        std::swap(b[i], b[j]);
139        i++, j--;
140    }
141}
142#define byteSwap(x) _byteSwap((unsigned char*) &x,sizeof(x))
143
144void OgreCEGUITexture::loadFromMemory(const void* buffPtr, uint buffWidth, uint buffHeight, PixelFormat pixelFormat)
145{
146        using namespace Ogre;
147
148        // get rid of old texture
149        freeOgreTexture();
150
151        // wrap input buffer with an Ogre DataChunk
152    uint32 bytesize = ((buffWidth * sizeof(uint32)) * buffHeight);
153
154#if OGRE_ENDIAN == OGRE_ENDIAN_BIG
155    uint32* swappedBuffer = new uint32[bytesize/4];
156    memcpy(swappedBuffer, buffPtr, bytesize);
157
158    for (int i=0; i < bytesize/4; i++)
159        byteSwap(swappedBuffer[i]);
160
161    DataStreamPtr odc(new MemoryDataStream(static_cast<void*>(swappedBuffer), bytesize, false));
162#else
163        DataStreamPtr odc(new MemoryDataStream(const_cast<void*>(buffPtr), bytesize, false));
164#endif
165
166        // get pixel type for the target texture - the elements here might look wrong, but is just
167        // differences in definition (at the core level, between GL and D3D).
168        Ogre::PixelFormat targetFmt =
169                (pixelFormat == PF_RGBA) ? Ogre::PF_A8R8G8B8 : Ogre::PF_R8G8B8;
170
171        // try to create a Ogre::Texture from the input data
172        d_ogre_texture = TextureManager::getSingleton().loadRawData(getUniqueName(), "General", odc, buffWidth, buffHeight, targetFmt , TEX_TYPE_2D, 0, 1.0f);
173
174        // if we got a pointer cache some details
175        if (!d_ogre_texture.isNull())
176        {
177                d_width         = d_ogre_texture->getWidth();
178                d_height        = d_ogre_texture->getHeight();
179        }
180        // no texture from memory so throw.
181        else
182        {
183                throw RendererException((utf8*)"Failed to create Texture object from memory:  Ogre returned a NULL Ogre::Texture pointer.");
184        }
185
186}
187
188
189/*************************************************************************
190        set the size of the internal Ogre texture.  Previous Ogre texture
191        is lost.       
192*************************************************************************/
193void OgreCEGUITexture::setOgreTextureSize(uint size)
194{
195        using namespace Ogre;
196
197        // unload any current Ogre::Texture
198        freeOgreTexture();
199
200        // Try to create an empty texture of the given size
201        d_ogre_texture = TextureManager::getSingleton().createManual(getUniqueName(), "General", TEX_TYPE_2D, size, size, 0, PF_A8R8G8B8, TU_DEFAULT);
202
203        // if we got a pointer cache some details
204        if (!d_ogre_texture.isNull())
205        {
206                d_width         = d_ogre_texture->getWidth();
207                d_height        = d_ogre_texture->getHeight();
208        }
209        // no texture so throw.
210        else
211        {
212                throw RendererException((utf8*)"Failed to create texture of specified size: Ogre::Texture creation failed.");
213        }
214
215}
216
217
218/*************************************************************************
219        safely free Ogre::Texture texture (can be called multiple times with
220        no ill effect)
221*************************************************************************/
222void OgreCEGUITexture::freeOgreTexture(void)
223{
224        if ((!d_ogre_texture.isNull()) && !d_isLinked)
225        {
226                Ogre::TextureManager::getSingleton().remove(d_ogre_texture->getHandle());
227        }
228        d_ogre_texture.setNull();
229}
230
231
232/*************************************************************************
233        return a Ogre::string that contains a unique name.     
234*************************************************************************/
235Ogre::String OgreCEGUITexture::getUniqueName(void)
236{
237        Ogre::String str;
238
239#ifdef CEGUI_USEOLDOGRESTRING
240        str << "_cegui_ogre_" << d_texturenumber;
241#else
242        Ogre::StringUtil::StrStreamType strstream;
243        strstream << "_cegui_ogre_" << d_texturenumber;
244        str = strstream.str();
245#endif
246
247        ++d_texturenumber;
248
249        return str;
250}
251
252
253/*************************************************************************
254        Set the internal Ogre::Texture object.
255*************************************************************************/
256void OgreCEGUITexture::setOgreTexture(Ogre::TexturePtr& texture)
257{
258        freeOgreTexture();
259
260        d_ogre_texture = texture;
261        d_width  = d_ogre_texture->getWidth();
262        d_height = d_ogre_texture->getHeight();
263        d_isLinked = true;
264}
265
266
267} // End of  CEGUI namespace section
268
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