post_shader.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015-2016 Mario Luzeiro <[email protected]>
 * Copyright The KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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, see <https://www.gnu.org/licenses/>.
 */

 
#ifndef POST_SHADER_H
#define POST_SHADER_H
 
#include <gal/3d/camera.h>
 
class POST_SHADER
{
public:
    explicit POST_SHADER( const CAMERA& aCamera );
    virtual ~POST_SHADER();
 
    virtual SFVEC3F Shade( const SFVEC2I& aShaderPos ) const = 0;

    virtual SFVEC4F ApplyShadeColor( const SFVEC2I& aShaderPos, const SFVEC4F& aInputColor,
                                     const SFVEC3F& aShadeColor ) const = 0;
 
    void UpdateSize( const SFVEC2UI& aSize );
 
    void UpdateSize( unsigned int xSize, unsigned int ySize );
 
    void InitFrame() { m_tmin = FLT_MAX; m_tmax = 0.0f; }
 
    void SetPixelData( unsigned int x, unsigned int y, const SFVEC3F& aNormal,
                       const SFVEC4F& aColor, const SFVEC3F& aHitPosition,
                       float aDepth, float aShadowAttFactor );
 
    const SFVEC4F& GetColorAtNotProtected( const SFVEC2I& aPos ) const;
 
    void DebugBuffersOutputAsImages() const;
 
    inline unsigned int GetIndex( const SFVEC2F& aPos ) const
    {
        SFVEC2F clampPos;
 
        clampPos.x = glm::clamp( aPos.x, 0.0f, 1.0f );
        clampPos.y = glm::clamp( aPos.y, 0.0f, 1.0f );
 
        const unsigned int idx = (unsigned int)( (float)m_size.x * clampPos.x +
                                                 (float)m_size.x * (float)m_size.y *
                                                 clampPos.y );
 
        return glm::min( idx, m_size.x * m_size.y );
    }
 
    inline unsigned int GetIndex( const SFVEC2I& aPos ) const
    {
        SFVEC2I clampPos;
        clampPos.x = glm::clamp( aPos.x, 0, (int)m_size.x - 1 );
        clampPos.y = glm::clamp( aPos.y, 0, (int)m_size.y - 1 );
 
        return (unsigned int)( clampPos.x + m_size.x * clampPos.y );
    }
 
protected:
    const SFVEC3F& GetNormalAt( const SFVEC2F& aPos ) const;
    const SFVEC4F& GetColorAt( const SFVEC2F& aPos ) const;
    const SFVEC3F& GetPositionAt( const SFVEC2F& aPos ) const;
    float GetDepthAt( const SFVEC2F& aPos ) const;
 
    const SFVEC3F& GetNormalAt( const SFVEC2I& aPos ) const;
    const SFVEC4F& GetColorAt( const SFVEC2I& aPos ) const;
    const SFVEC3F& GetPositionAt( const SFVEC2I& aPos ) const;
    const float& GetShadowFactorAt( const SFVEC2I& aPos ) const;
 
    float GetDepthAt( const SFVEC2I& aPos ) const;
    float GetDepthNormalizedAt( const SFVEC2I& aPos ) const;
    float GetMaxDepth() const { return m_tmax; }
 
private:
    void destroy_buffers();
 
protected:
    const CAMERA& m_camera;
 
    SFVEC2UI m_size;
    SFVEC3F* m_normals;
    SFVEC4F* m_color;
    SFVEC3F* m_wc_hitposition;
    float*   m_depth;
    float*   m_shadow_att_factor;
    float    m_tmin;
    float    m_tmax;
};
 
 
#endif   // POST_SHADER_H