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sglLogicOp Class Reference

#include <sglStatelet.hpp>

Inheritance diagram for sglLogicOp::

List of all members.

Public Types
enum	LogicOpEnum {   eCOPY = GL_COPY,   eCLEAR = GL_CLEAR,   eSET = GL_SET,   eCOPY_INVERTED = GL_COPY_INVERTED,   eNOOP = GL_NOOP,   eINVERT = GL_INVERT,   eAND = GL_AND,   eNAND = GL_NAND,   eOR = GL_OR,   eNOR = GL_NOR,   eXOR = GL_XOR,   eEQUIV = GL_EQUIV,   eAND_REVERSE = GL_AND_REVERSE,   eAND_INVERTED = GL_AND_INVERTED,   eOR_REVERSE = GL_OR_REVERSE,   eOR_INVERTED = GL_OR_INVERTED }
Public Methods
	sglLogicOp (LogicOpEnum op=eCOPY)
virtual	~sglLogicOp ()
void	setLogicOp (LogicOpEnum op)
LogicOpEnum	getLogicOp () const
void	apply (sglCurrState *curr_state) const
virtual void	printInfo (ostream &ostrm, const char *indent_string) const
Protected Attributes
LogicOpEnum	m_logic_op

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Detailed Description

This statelet encapsulates OpenGL's glLogicOp() and glEnable(GL_COLOR_LOGIC_OP) functions (note that glEnable(GL_INDEX_LOGIC_OP) is not supported by SGL) which sets the logical operation to be performed given the incoming fragment and the pixel currently stored in the color buffer. The default operation is sglLogicOp::eCOPY which overwrites the color buffer (destination) with the incoming fragment (source). The complete list of logical operations is contained in the LogicOpEnum list of this class.

Example:

   sglLogicOp *logic_op = new sglLogicOp;     // defaults to eCOPY
   logic_op->setLogicOp(sglLogicOp::eEQUIV);  // ~(source XOR dest)

Definition at line 1377 of file sglStatelet.hpp.

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Member Enumeration Documentation

enum sglLogicOp::LogicOpEnum

The list of valid logic op tokens. Enumeration values: eCOPY   source (the default). eCLEAR   zero. eSET   one. eCOPY_INVERTED   ~source. eNOOP   dest. eINVERT   ~dest. eAND   source & dest. eNAND   ~(source & dest). eOR   source | dest. eNOR   ~(source | dest). eXOR   source ^ dest. eEQUIV   ~(source ^ dest). eAND_REVERSE   source & ~dest. eAND_INVERTED   ~source & dest. eOR_REVERSE   source | ~dest. eOR_INVERTED   ~source | dest. Definition at line 1381 of file sglStatelet.hpp.

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Constructor & Destructor Documentation

sglLogicOp::sglLogicOp ( LogicOpEnum op = eCOPY ) [inline]

Constructor (also the default constructor). Parameters: op   The logical operation (one of the LogicOpEnum tokens). The default is eCOPY. Definition at line 1422 of file sglStatelet.hpp.

sglLogicOp::~sglLogicOp ( ) [inline, virtual]

virtual destructor. Definition at line 1426 of file sglStatelet.hpp.

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Member Function Documentation

void sglLogicOp::setLogicOp ( LogicOpEnum op ) [inline]

Set the logical operation. Parameters: op   The logical operation (one of the LogicOpEnum tokens). Definition at line 1431 of file sglStatelet.hpp.

LogicOpEnum sglLogicOp::getLogicOp ( ) const [inline]

Query the current logical operation. Returns: One of the LogicOpEnum tokens corresponding to the current logical operation. Definition at line 1437 of file sglStatelet.hpp.

void sglLogicOp::apply ( sglCurrState * curr_state ) const [virtual]

Apply this state change to the current rendering state. Parameters: curr_state   Required for statelets that affect one another. For example the sglTransparency sets up depth mask and blending modes which interact with the sglBlending and sglDepthMask statelets, and the curr_state object is used to resolve these internal issues. Reimplemented from sglStatelet.

virtual void sglLogicOp::printInfo ( ostream & ostrm, const char * indent_string ) const [virtual]

Output the state of this node to the specified ostream. Parameters: ostrm   the ostream to which the output is sent indent_string   the string (usually spaces) that is output at the beginning of every line of output Reimplemented from sglStatelet.

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The documentation for this class was generated from the following file:

• sglStatelet.hpp

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