409cdd0b28
local function pointer to avoid compiler warnings related to case void*. Moved various OSG classes across to using setGLExtensions instead of getGLExtensions, and changed them to use typedef declarations in the headers rather than casts in the .cpp. Updated wrappers
153 lines
5.5 KiB
C++
153 lines
5.5 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 glBlendEquation(GLenum mode) const;
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protected:
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~Extensions() {}
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typedef void (APIENTRY * GLBlendEquationProc) (GLenum mode);
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bool _isBlendEquationSupported;
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bool _isSGIXMinMaxSupported;
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bool _isLogicOpSupported;
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GLBlendEquationProc _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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