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161 lines
6.3 KiB
161 lines
6.3 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_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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BlendEquation(Equation equationRGB, Equation equationAlpha); |
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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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_equationRGB(trans._equationRGB), |
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_equationAlpha(trans._equationAlpha){} |
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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_Parameter 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(_equationRGB) |
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COMPARE_StateAttribute_Parameter(_equationAlpha) |
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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) { _equationRGB = _equationAlpha = equation; } |
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inline Equation getEquation() const { return _equationRGB; } |
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inline void setEquationRGB(Equation equation) { _equationRGB = equation; } |
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inline Equation getEquationRGB() const { return _equationRGB; } |
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inline void setEquationAlpha(Equation equation) { _equationAlpha = equation; } |
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inline Equation getEquationAlpha() const { return _equationAlpha; } |
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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 convenience 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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bool isBlendEquationSupported() const { return _isBlendEquationSupported; } |
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bool isBlendEquationSeparateSupported() const { return _isBlendEquationSeparateSupported; } |
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bool isSGIXMinMaxSupported() const { return _isSGIXMinMaxSupported; } |
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bool isLogicOpSupported() const { return _isLogicOpSupported; } |
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void glBlendEquation(GLenum mode) const; |
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void glBlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha) const; |
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protected: |
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~Extensions() {} |
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typedef void (GL_APIENTRY * GLBlendEquationProc)(GLenum mode); |
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typedef void (GL_APIENTRY * GLBlendEquationSeparateProc)(GLenum modeRGB, GLenum modeAlpha); |
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bool _isBlendEquationSupported; |
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bool _isBlendEquationSeparateSupported; |
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bool _isSGIXMinMaxSupported; |
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bool _isLogicOpSupported; |
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GLBlendEquationProc _glBlendEquation; |
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GLBlendEquationSeparateProc _glBlendEquationSeparate; |
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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 Extensions 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 _equationRGB, _equationAlpha; |
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}; |
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} |
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#endif
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