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 (C) 2015-2020 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#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 SFVEC3F ApplyShadeColor( const SFVEC2I& aShaderPos, const SFVEC3F& 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 SFVEC3F& aColor, const SFVEC3F& aHitPosition,
 float aDepth, float aShadowAttFactor );
 
 const SFVEC3F& 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 SFVEC3F& 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 SFVEC3F& 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;
 SFVEC3F* m_color;
 SFVEC3F* m_wc_hitposition;
 float* m_depth;
 float* m_shadow_att_factor;
 float m_tmin;
 float m_tmax;
};
 
 
#endif // POST_SHADER_H