RAS_2DFilterManager.h

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/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

#ifndef __RAS_I2DFILTER
#define __RAS_I2DFILTER

#include "RAS_ICanvas.h"
#define MAX_RENDER_PASS 100

#ifdef WITH_CXX_GUARDEDALLOC
#include "MEM_guardedalloc.h"
#endif

class RAS_2DFilterManager
{
private:
        unsigned int    CreateShaderProgram(const char* shadersource);
        unsigned int    CreateShaderProgram(int filtermode);
        void            AnalyseShader(int passindex, vector<STR_String>& propNames);
        void                    StartShaderProgram(int passindex);
        void                    EndShaderProgram();
        void                    PrintShaderErrors(unsigned int shader, const char *task, const char *code);

        void SetupTextures(bool depth, bool luminance);
        void FreeTextures();

        void UpdateOffsetMatrix(RAS_ICanvas* canvas);
        void UpdateCanvasTextureCoord(unsigned int * viewport);
 
        float                   canvascoord[4];
        float                   textureoffsets[18];
        float                   view[4];
        /* texname[0] contains render to texture, texname[1] contains depth texture,  texname[2] contains luminance texture*/
        unsigned int    texname[3]; 
        int                             texturewidth;
        int                             textureheight;
        int                             canvaswidth;
        int                             canvasheight;
        int                             numberoffilters;
        /* bit 0: enable/disable depth texture
         * bit 1: enable/disable luminance texture*/
        short                   texflag[MAX_RENDER_PASS];

        bool                    isshadersupported;
        bool                    errorprinted;
        bool                    need_tex_update;

        unsigned int    m_filters[MAX_RENDER_PASS];
        short           m_enabled[MAX_RENDER_PASS];

        // stores object properties to send to shaders in each pass
        vector<STR_String>      m_properties[MAX_RENDER_PASS];
        void* m_gameObjects[MAX_RENDER_PASS];
public:
        enum RAS_2DFILTER_MODE {
                RAS_2DFILTER_ENABLED = -2,
                RAS_2DFILTER_DISABLED = -1,
                RAS_2DFILTER_NOFILTER = 0,
                RAS_2DFILTER_MOTIONBLUR,
                RAS_2DFILTER_BLUR,
                RAS_2DFILTER_SHARPEN,
                RAS_2DFILTER_DILATION,
                RAS_2DFILTER_EROSION,
                RAS_2DFILTER_LAPLACIAN,
                RAS_2DFILTER_SOBEL,
                RAS_2DFILTER_PREWITT,
                RAS_2DFILTER_GRAYSCALE,
                RAS_2DFILTER_SEPIA,
                RAS_2DFILTER_INVERT,
                RAS_2DFILTER_CUSTOMFILTER,
                RAS_2DFILTER_NUMBER_OF_FILTERS
        };

        RAS_2DFilterManager();

        ~RAS_2DFilterManager();

        void RenderFilters(RAS_ICanvas* canvas);

        void EnableFilter(vector<STR_String>& propNames, void* gameObj, RAS_2DFILTER_MODE mode, int pass, STR_String& text);
        
        
#ifdef WITH_CXX_GUARDEDALLOC
public:
        void *operator new(size_t num_bytes) { return MEM_mallocN(num_bytes, "GE:RAS_2DFilterManager"); }
        void operator delete( void *mem ) { MEM_freeN(mem); }
#endif
};
#endif