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) 2000-2012 Torus Knot Software Ltd
8 
9  Permission is hereby granted, free of charge, to any person obtaining a copy
10  of this software and associated documentation files (the "Software"), to deal
11  in the Software without restriction, including without limitation the rights
12  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13  copies of the Software, and to permit persons to whom the Software is
14  furnished to do so, subject to the following conditions:
15 
16  The above copyright notice and this permission notice shall be included in
17  all copies or substantial portions of the Software.
18 
19  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
22  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
24  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
25  THE SOFTWARE.
26  -----------------------------------------------------------------------------
27  */
28 
29 #include "OgreGLUniformCache.h"
30 #include "OgreCommon.h"
31 
32 namespace Ogre {
33 
clearCache()34     void GLUniformCache::clearCache()
35     {
36 #ifdef OGRE_ENABLE_STATE_CACHE
37         mUniformValueMap.clear();
38 #endif
39     }
40 
updateUniform(int location,const void * value,int length)41     bool GLUniformCache::updateUniform(int location, const void *value, int length)
42     {
43 #ifdef OGRE_ENABLE_STATE_CACHE
44         uint32 current = mUniformValueMap[location];
45         uint32 hash = Ogre::FastHash((const char *)value, length);
46         // First check if the uniform name is in the map. If not, this is new so insert it into the map.
47         if (!current || (current != hash))
48         {
49             // Haven't cached this state yet or the value has changed
50             mUniformValueMap[location] = hash;
51             return true;
52         }
53 
54         return false;
55 #else
56         return true;
57 #endif
58     }
59 }
60