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99 lines
3.3 KiB
99 lines
3.3 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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* |
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* This library is open source and may be redistributed and/or modified under |
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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* (at your option) any later version. The full license is in LICENSE file |
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* included with this distribution, and on the openscenegraph.org website. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* OpenSceneGraph Public License for more details. |
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*/ |
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#ifndef OSG_POLYGONOFFSET |
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#define OSG_POLYGONOFFSET 1 |
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#include <osg/StateAttribute> |
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#ifndef GL_POLYGON_OFFSET_LINE |
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#define GL_POLYGON_OFFSET_LINE 0x2A02 |
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#define GL_POLYGON_OFFSET_POINT 0x2A01 |
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#endif |
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namespace osg { |
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/** PolygonOffset - encapsulates the OpenGL glPolygonOffset state.*/ |
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class OSG_EXPORT PolygonOffset : public StateAttribute |
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{ |
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public : |
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PolygonOffset(); |
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PolygonOffset(float factor, float units); |
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/** Copy constructor using CopyOp to manage deep vs shallow copy.*/ |
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PolygonOffset(const PolygonOffset& po,const CopyOp& copyop=CopyOp::SHALLOW_COPY): |
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StateAttribute(po,copyop), |
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_factor(po._factor), |
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_units(po._units) {} |
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META_StateAttribute(osg, PolygonOffset, POLYGONOFFSET); |
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/** return -1 if *this < *rhs, 0 if *this==*rhs, 1 if *this>*rhs.*/ |
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virtual int compare(const StateAttribute& sa) const |
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{ |
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// check the types are equal and then create the rhs variable |
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// used by the COMPARE_StateAttribute_Parameter macros below. |
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COMPARE_StateAttribute_Types(PolygonOffset,sa) |
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// compare each parameter in turn against the rhs. |
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COMPARE_StateAttribute_Parameter(_factor) |
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COMPARE_StateAttribute_Parameter(_units) |
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return 0; // passed all the above comparison macros, must be equal. |
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} |
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virtual bool getModeUsage(StateAttribute::ModeUsage& usage) const |
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{ |
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usage.usesMode(GL_POLYGON_OFFSET_FILL); |
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#if !defined(OSG_GLES1_AVAILABLE) && !defined(OSG_GLES2_AVAILABLE) |
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usage.usesMode(GL_POLYGON_OFFSET_LINE); |
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usage.usesMode(GL_POLYGON_OFFSET_POINT); |
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#endif |
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return true; |
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} |
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inline void setFactor(float factor) { _factor = factor; } |
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inline float getFactor() const { return _factor; } |
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inline void setUnits(float units) { _units = units; } |
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inline float getUnits() const { return _units; } |
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virtual void apply(State& state) const; |
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static void setFactorMultiplier(float multiplier); |
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static float getFactorMultiplier(); |
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static void setUnitsMultiplier(float multiplier); |
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static float getUnitsMultiplier(); |
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static bool areFactorAndUnitsMultipliersSet(); |
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/** Checks with the OpenGL driver to try and pick multiplier appropriate for the hardware. |
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note, requires a valid graphics context to be current. */ |
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static void setFactorAndUnitsMultipliersUsingBestGuessForDriver(); |
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protected : |
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virtual ~PolygonOffset(); |
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float _factor; |
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float _units; |
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}; |
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} |
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#endif
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