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