[692] | 1 | /*
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| 2 | -----------------------------------------------------------------------------
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| 3 | This source file is part of OGRE
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| 4 | (Object-oriented Graphics Rendering Engine)
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| 5 | For the latest info, see http://www.ogre3d.org/
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| 6 |
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| 7 | Copyright (c) 2000-2005 The OGRE Team
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| 8 | Also see acknowledgements in Readme.html
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| 9 |
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| 10 | This program is free software you can redistribute it and/or modify it under
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| 11 | the terms of the GNU Lesser General Public License as published by the Free Software
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| 12 | Foundation either version 2 of the License, or (at your option) any later
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| 13 | version.
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| 14 |
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| 15 | This program is distributed in the hope that it will be useful, but WITHOUT
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| 16 | ANY WARRANTY without even the implied warranty of MERCHANTABILITY or FITNESS
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| 17 | FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU Lesser General Public License along with
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| 20 | this program if not, write to the Free Software Foundation, Inc., 59 Temple
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| 21 | Place - Suite 330, Boston, MA 02111-1307, USA, or go to
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| 22 | http://www.gnu.org/copyleft/lesser.txt.
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| 23 | -----------------------------------------------------------------------------
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| 24 | */
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| 25 | #ifndef __GLSLLinkProgramManager_H__
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| 26 | #define __GLSLLinkProgramManager_H__
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| 27 |
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| 28 | #include "OgreGLPrerequisites.h"
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| 29 | #include "OgreSingleton.h"
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| 30 |
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| 31 | #include "OgreGLSLExtSupport.h"
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| 32 |
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| 33 | namespace Ogre {
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| 34 |
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| 35 | /** Ogre assumes that there are seperate vertex and fragment programs to deal with but
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| 36 | GLSL has one program object that represents the active vertex and fragment shader objects
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| 37 | during a rendering state. GLSL Vertex and fragment
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| 38 | shader objects are compiled seperately and then attached to a program object and then the
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| 39 | program object is linked. Since Ogre can only handle one vertex program and one fragment
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| 40 | program being active in a pass, the GLSL Link Program Manager does the same. The GLSL Link
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| 41 | program manager acts as a state machine and activates a program object based on the active
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| 42 | vertex and fragment program. Previously created program objects are stored along with a unique
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| 43 | key in a hash_map for quick retrieval the next time the program object is required.
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| 44 |
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| 45 | */
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| 46 |
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| 47 | class GLSLLinkProgramManager : public Singleton<GLSLLinkProgramManager>
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| 48 | {
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| 49 |
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| 50 | private:
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| 51 |
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| 52 | typedef HashMap<GLuint, GLSLLinkProgram*> LinkProgramMap;
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| 53 | typedef LinkProgramMap::iterator LinkProgramIterator;
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| 54 |
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| 55 | /// container holding previously created program objects
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| 56 | LinkProgramMap LinkPrograms;
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| 57 |
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| 58 | /// active objects defining the active rendering gpu state
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| 59 | GLSLGpuProgram* mActiveVertexGpuProgram;
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| 60 | GLSLGpuProgram* mActiveFragmentGpuProgram;
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| 61 | GLSLLinkProgram* mActiveLinkProgram;
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| 62 |
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| 63 | public:
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| 64 |
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| 65 | GLSLLinkProgramManager(void);
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| 66 |
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| 67 | ~GLSLLinkProgramManager(void);
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| 68 |
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| 69 | /**
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| 70 | Get the program object that links the two active shader objects together
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| 71 | if a program object was not already created and linked a new one is created and linked
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| 72 | */
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| 73 | GLSLLinkProgram* getActiveLinkProgram(void);
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| 74 |
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| 75 | /** Set the active fragment shader for the next rendering state.
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| 76 | The active program object will be cleared.
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| 77 | Normally called from the GLSLGpuProgram::bindProgram and unbindProgram methods
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| 78 | */
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| 79 | void setActiveFragmentShader(GLSLGpuProgram* fragmentGpuProgram);
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| 80 | /** Set the active vertex shader for the next rendering state.
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| 81 | The active program object will be cleared.
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| 82 | Normally called from the GLSLGpuProgram::bindProgram and unbindProgram methods
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| 83 | */
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| 84 | void setActiveVertexShader(GLSLGpuProgram* vertexGpuProgram);
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| 85 |
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| 86 | static GLSLLinkProgramManager& getSingleton(void);
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| 87 | static GLSLLinkProgramManager* getSingletonPtr(void);
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| 88 |
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| 89 | };
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| 90 |
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| 91 | }
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| 92 |
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| 93 | #endif // __GLSLLinkProgramManager_H__
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