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//##########################################################################
//# #
//# CCFBO #
//# #
//# This program is free software; you can redistribute it and/or modify #
//# it under the terms of the GNU Library General Public License as #
//# published by the Free Software Foundation; version 2 or later of the License. #
//# #
//# 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. #
//# #
//# COPYRIGHT: EDF R&D / TELECOM ParisTech (ENST-TSI) #
//# #
//##########################################################################
#ifndef CC_GL_FILTER_HEADER
#define CC_GL_FILTER_HEADER
//Qt
#include <QString>
//! Default GL filter interface
/** A GL filter is a combination of shaders applied to
textures (typically the rendered scene), typically
through intensive use of Frame Buffer Objects.
**/
class ccGlFilter
{
public:
//! Default constructor
ccGlFilter(QString description)
: m_isValid(false)
, m_description(description)
{}
//! Default destructor
virtual ~ccGlFilter() {}
//! Returns filter name
inline virtual QString getDescription() const { return m_description; }
//! Cloning mechanism
virtual ccGlFilter* clone() const = 0;
//! Initializes GL filter
/** Must support reinit!
\param width texture/screen width
\param height texture/screen height
\param shadersPath path where shader files are stored
\param error error string (if an error occurred)
\return success
**/
virtual bool init( unsigned width,
unsigned height,
QString shadersPath,
QString& error) = 0;
//! Minimal set of 3D viewport parameters that can be used by shaders
struct ViewportParameters
{
//! Default constructor
ViewportParameters()
: zoom(1.0)
, perspectiveMode(false)
, zNear(0.0)
, zFar(1.0)
{}
//! Zoom
double zoom;
//! Whether perspective mode is enabled or not
bool perspectiveMode;
//! Near clipping plane position (perspective mode only)
double zNear;
//! Far clipping plane position (perspective mode only)
double zFar;
};
//! Applies filter to texture (depth + color)
virtual void shade( unsigned texDepth,
unsigned texColor,
ViewportParameters& parameters) = 0;
//! Returns resulting texture
virtual unsigned getTexture() = 0;
protected: //methods
//! Sets whether the filter is valid
inline void setValid(bool state) { m_isValid = state; }
//! Returns whether the filter is valid
inline bool isValid() const { return m_isValid; }
protected:
//! Filter validity
bool m_isValid;
//! Filter description
QString m_description;
};
#endif
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