eac3dc1963
of these are public APIs and therefore will break linkage to existing shared libraries." Note from Robert Osfield, updated wrappers.
152 lines
5.4 KiB
C++
152 lines
5.4 KiB
C++
/* -*-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_BLENDEQUATION
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#define OSG_BLENDEQUATION 1
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#include <osg/StateAttribute>
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#ifndef GL_VERSION_1_2
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/* Logic Ops */
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#define GL_MIN 0x8007
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#define GL_MAX 0x8008
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#define GL_FUNC_ADD 0x8006
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#define GL_FUNC_SUBTRACT 0x800A
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#define GL_FUNC_REVERSE_SUBTRACT 0x800B
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#endif
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#ifndef GL_LOGIC_OP
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#define GL_LOGIC_OP 0x0BF1
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#endif
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#ifndef GL_ALPHA_MIN_SGIX
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#define GL_ALPHA_MIN_SGIX 0x8320
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#define GL_ALPHA_MAX_SGIX 0x8321
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#endif
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namespace osg {
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/** Encapsulates OpenGL BlendEquation state. */
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class OSG_EXPORT BlendEquation : public StateAttribute
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{
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public :
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enum Equation {
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RGBA_MIN = GL_MIN,
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RGBA_MAX = GL_MAX,
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ALPHA_MIN = GL_ALPHA_MIN_SGIX,
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ALPHA_MAX = GL_ALPHA_MAX_SGIX,
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LOGIC_OP = GL_LOGIC_OP,
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FUNC_ADD = GL_FUNC_ADD,
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FUNC_SUBTRACT = GL_FUNC_SUBTRACT,
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FUNC_REVERSE_SUBTRACT = GL_FUNC_REVERSE_SUBTRACT
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};
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BlendEquation();
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BlendEquation(Equation equation);
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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BlendEquation(const BlendEquation& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(trans,copyop),
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_equation(trans._equation){}
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META_StateAttribute(osg, BlendEquation,BLENDEQUATION);
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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 for equal types, then create the rhs variable
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// used by the COMPARE_StateAttribute_Paramter macros below.
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COMPARE_StateAttribute_Types(BlendEquation,sa)
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// Compare each parameter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_equation)
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return 0; // Passed all the above comparison macros, so 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_BLEND);
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return true;
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}
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inline void setEquation(Equation equation)
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{
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_equation = equation;
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}
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inline Equation getEquation() const { return _equation; }
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virtual void apply(State& state) const;
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/** Encapsulates queries of extension availability, obtains extension
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* function pointers, and provides convinience wrappers for
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* calling extension functions. */
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class OSG_EXPORT Extensions : public osg::Referenced
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{
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public:
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Extensions(unsigned int contextID);
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Extensions(const Extensions& rhs);
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void lowestCommonDenominator(const Extensions& rhs);
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void setupGLExtensions(unsigned int contextID);
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void setBlendEquationSupported(bool flag) { _isBlendEquationSupported=flag; }
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bool isBlendEquationSupported() const { return _isBlendEquationSupported; }
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bool isSGIXMinMaxSupported() const { return _isSGIXMinMaxSupported; }
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bool isLogicOpSupported() const { return _isLogicOpSupported; }
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void setBlendEquationProc(void* ptr) { _glBlendEquation = ptr; }
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void glBlendEquation(GLenum mode) const;
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protected:
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~Extensions() {}
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bool _isBlendEquationSupported;
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bool _isSGIXMinMaxSupported;
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bool _isLogicOpSupported;
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void* _glBlendEquation;
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};
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/** Returns the Extensions object for the given context.
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* If createIfNotInitalized is true and the Exentsions object doesn't
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* exist, getExtensions() creates it on the given context.
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* Returns NULL if createIfNotInitalized is false and the Extensions
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* object doesn't exist. */
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static Extensions* getExtensions(unsigned int contextID,bool createIfNotInitalized);
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/** setExtensions() allows users to override the extensions across graphics contexts.
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* Typically used when you have different extensions supported across graphics pipes,
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* but need to ensure that they all use the same low common denominator extensions. */
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static void setExtensions(unsigned int contextID,Extensions* extensions);
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protected :
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virtual ~BlendEquation();
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Equation _equation;
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};
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}
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#endif
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