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////////////////////////////////////////////////////////////////////////////
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//        File:                ProgramGPU.h
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//        Author:                Changchang Wu
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//        Description : Based class for GPU programs
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//                ProgramGPU:        base class of ProgramGLSL
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//                FilterProgram:        base class of FilterGLSL, FilterPKSL
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//
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//        Copyright (c) 2007 University of North Carolina at Chapel Hill
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//        All Rights Reserved
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//
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//        Permission to use, copy, modify and distribute this software and its
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//        documentation for educational, research and non-profit purposes, without
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//        fee, and without a written agreement is hereby granted, provided that the
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//        above copyright notice and the following paragraph appear in all copies.
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//        
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//        The University of North Carolina at Chapel Hill make no representations
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//        about the suitability of this software for any purpose. It is provided
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//        'as is' without express or implied warranty. 
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//
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//        Please send BUG REPORTS to ccwu@cs.unc.edu
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//
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////////////////////////////////////////////////////////////////////////////
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#ifndef _PROGRAM_GPU_H
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#define _PROGRAM_GPU_H
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////////////////////////////////////////////////////////////////////////////
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//class                ProgramGPU
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//description:        pure virtual class
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//                                provides a common interface for shader programs
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///////////////////////////////////////////////////////////////////////////
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class ProgramGPU
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{
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public:
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        //use a gpu program
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        virtual int     UseProgram() = 0;
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    virtual void*   GetProgramID() = 0;
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        //not used
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        virtual ~ProgramGPU(){};
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};
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///////////////////////////////////////////////////////////////////////////
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//class                        FilterProgram
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///////////////////////////////////////////////////////////////////////////
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class  FilterProgram
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{
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public:
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        ProgramGPU*  s_shader_h;
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        ProgramGPU*  s_shader_v;
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        int                         _size;
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        int                         _id; 
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public:
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    FilterProgram()          {  s_shader_h = s_shader_v = NULL; _size = _id = 0; }
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    virtual ~FilterProgram() {        if(s_shader_h) delete s_shader_h;        if(s_shader_v) delete s_shader_v;}
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};
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#endif
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