145 lines
4.8 KiB
C++
145 lines
4.8 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_CLAMPCOLOR
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#define OSG_CLAMPCOLOR 1
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#include <osg/StateAttribute>
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#ifndef GL_ARB_color_buffer_float
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#define GL_RGBA_FLOAT_MODE_ARB 0x8820
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#define GL_CLAMP_VERTEX_COLOR_ARB 0x891A
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#define GL_CLAMP_FRAGMENT_COLOR_ARB 0x891B
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#define GL_CLAMP_READ_COLOR_ARB 0x891C
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#define GL_FIXED_ONLY_ARB 0x891D
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#endif
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namespace osg {
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/** Encapsulates OpenGL ClampColor state. */
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class OSG_EXPORT ClampColor : public StateAttribute
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{
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public :
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enum Target {
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CLAMP_VERTEX_COLOR = GL_CLAMP_VERTEX_COLOR_ARB,
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CLAMP_FRAGMENT_COLOR = GL_CLAMP_FRAGMENT_COLOR_ARB,
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CLAMP_READ_COLOR = GL_CLAMP_READ_COLOR_ARB
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};
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enum Mode {
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FIXED_ONLY = GL_FIXED_ONLY_ARB,
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FALSE = GL_FALSE,
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TRUE = GL_TRUE
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};
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ClampColor();
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ClampColor(Target target, Mode mode);
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/** Copy constructor using CopyOp to manage deep vs shallow copy. */
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ClampColor(const ClampColor& trans,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
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StateAttribute(trans,copyop),
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_target(trans._target),
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_mode(trans._mode) {}
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META_StateAttribute(osg, ClampColor,CLAMPCOLOR);
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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(ClampColor,sa)
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// Compare each parameter in turn against the rhs.
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COMPARE_StateAttribute_Parameter(_target)
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COMPARE_StateAttribute_Parameter(_mode)
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return 0; // Passed all the above comparison macros, so must be equal.
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}
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inline void setTarget(Target target)
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{
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_target = target;
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}
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inline Target getTarget() const { return _target; }
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inline void setMode(Mode mode)
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{
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_mode = mode;
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}
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inline Mode getMode() const { return _mode; }
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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 setupGLExtenions(unsigned int contextID);
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void setClampColorSupported(bool flag) { _isClampColorSupported=flag; }
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bool isClampColorSupported() const { return _isClampColorSupported; }
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void setClampColorProc(void* ptr) { _glClampColor = ptr; }
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void glClampColor(GLenum target, GLenum mode) const;
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protected:
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~Extensions() {}
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bool _isClampColorSupported;
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void* _glClampColor;
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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 ~ClampColor();
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Target _target;
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Mode _mode;
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};
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}
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#endif
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