libogre-1.9-dev 1.9.0+dfsg1-1 / usr / include / OGRE / RTShaderSystem / OgreShaderFunctionAtom.h

/*
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This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
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*/
#ifndef _ShaderFunctionAtom_
#define _ShaderFunctionAtom_

#include "OgreShaderPrerequisites.h"
#include "OgreGpuProgram.h"
#include "OgreSingleton.h"
#include "OgreShaderParameter.h"
#include "OgreStringVector.h"

namespace Ogre {
namespace RTShader {

/** \addtogroup Core
*  @{
*/
/** \addtogroup RTShader
*  @{
*/

/** A class that represents an atomic code section of shader based program function.
*/
class _OgreRTSSExport FunctionAtom : public RTShaderSystemAlloc
{
// Interface.
public:
	/** Class default constructor. */
	FunctionAtom();

	/** Class default destructor. */
	virtual ~FunctionAtom() {}

	/** Get the group execution order of this function atom. */
	int getGroupExecutionOrder() const;
	
	/** Get an internal execution order within a group of this function atom. */
	int getInternalExecutionOrder() const;
	
	/** Abstract method that writes a source code to the given output stream in the target shader language. */
	virtual void writeSourceCode(std::ostream& os, const String& targetLanguage) const = 0;
	
	/** Return the type of this atom instance implementation. */
	virtual const String& getFunctionAtomType() = 0;

// Attributes.
protected:
	// The owner group execution order.	
	int mGroupExecutionOrder;
	// The execution order within the group.		
	int mInternalExecutionOrder;
};

/** A class that represents a function operand (its the combination of a parameter the in/out semantic and the used fields)
*/
class _OgreRTSSExport Operand : public RTShaderSystemAlloc
{
public:

	// InOut semantic
	enum OpSemantic
	{
		/// The parameter is a input parameter
		OPS_IN, 
		/// The parameter is a output parameter
		OPS_OUT,
		/// The parameter is a input/output parameter
		OPS_INOUT
	};

	// Used field mask
	enum OpMask
	{
		OPM_ALL		= 0x0001,
		OPM_X		= 0x0002,
		OPM_Y		= 0x0004,
		OPM_Z		= 0x0008,
		OPM_W		= 0x0010,
		OPM_XY		= OPM_X | OPM_Y,
		OPM_XZ		= OPM_X | OPM_Z,
		OPM_XW		= OPM_X | OPM_W,
		OPM_YZ		= OPM_Y | OPM_Z,
		OPM_YW		= OPM_Y | OPM_W,
		OPM_ZW		= OPM_Z | OPM_W,
		OPM_XYZ		= OPM_X | OPM_Y | OPM_Z,
		OPM_XYW		= OPM_X | OPM_Y | OPM_W,
		OPM_XZW		= OPM_X | OPM_Z | OPM_W,
		OPM_YZW		= OPM_Y | OPM_Z | OPM_W,
		OPM_XYZW	= OPM_X | OPM_Y | OPM_Z | OPM_W
	};

	/** Class constructor 
	@param parameter A function parameter.
	@param opSemantic The in/out semantic of the parameter.
	@param opMask The field mask of the parameter.
	*/
	Operand(ParameterPtr parameter, Operand::OpSemantic opSemantic, int opMask = Operand::OPM_ALL, ushort indirectionLevel = 0);

	/** Copy constructor */
	Operand(const Operand& rhs);

	/** Copy the given Operand to this Operand.
	@param rhs The other Operand to copy to this state.
	*/
	Operand& operator= (const Operand & rhs);

	/** Class destructor */
	~Operand();

	/** Returns the parameter object as weak reference */
	const ParameterPtr& getParameter()	const { return mParameter; }

	/** Returns true if not all fields used. (usage is described through semantic)*/
	bool hasFreeFields()	const { return ((mMask & ~OPM_ALL) && ((mMask & ~OPM_X) || (mMask & ~OPM_Y) || (mMask & ~OPM_Z) || (mMask & ~OPM_W))); }
	
	/** Returns the mask bitfield. */
	int getMask()	const { return mMask; }

	/** Returns the operand semantic (do we read/write or both with the parameter). */
	OpSemantic getSemantic()	const { return mSemantic; }

	/** Returns the level of indirection. 
	The greater the indirection level the more the parameter needs to be nested in brackets.
	For example given 4 parameters x1...x4 with the indirections levels 0,1,1,2 
	respectively. The parameters should form the following string: x1[x2][x3[x4]].
	*/
	ushort getIndirectionLevel()	const { return mIndirectionLevel; }

	/** Returns the parameter name and the usage mask like this 'color.xyz' */
	String toString()	const;

	/** Returns the given mask as string representation. */
	static String getMaskAsString(int mask);

	/** Return the float count of the given mask. */
	static int getFloatCount(int mask);

	/** Return the gpu constant type of the given mask. */
	static GpuConstantType getGpuConstantType(int mask);

protected:
	/// The parameter being carried by the operand
	ParameterPtr mParameter;
	/// Tells if the parameter is of type input,output or both
	OpSemantic mSemantic;
	/// Which part of the parameter should be passed (x,y,z,w)
	int mMask;
	/// The level of indirection. @see getIndirectionLevel
	ushort mIndirectionLevel;
};

/** A class that represents function invocation code from shader based program function.
*/
class _OgreRTSSExport FunctionInvocation : public FunctionAtom
{
	// Interface.
public:	
	typedef vector<Operand>::type OperandVector;

	/** Class constructor 
	@param functionName The name of the function to invoke.
	@param groupOrder The group order of this invocation.
	@param internalOrder The internal order of this invocation.
	@param returnType The return type of the used function.
	*/
	FunctionInvocation(const String& functionName, int groupOrder, int internalOrder, String returnType = "void");

    /** Copy constructor */
	FunctionInvocation(const FunctionInvocation& rhs);

	/** 
	@see FunctionAtom::writeSourceCode
	*/
	virtual void writeSourceCode(std::ostream& os, const String& targetLanguage) const;

	/** 
	@see FunctionAtom::getFunctionAtomType
	*/
	virtual const String& getFunctionAtomType() { return Type; }

	/** Get a list of parameters this function invocation will use in the function call as arguments. */
	OperandVector& getOperandList() { return mOperands; }
	
	/** Push a new operand (on the end) to the function. 
	@param parameter A function parameter.
	@param opSemantic The in/out semantic of the parameter.
	@param opMask The field mask of the parameter.
	@param indirectionLevel The level of nesting inside brackets
	*/
	void pushOperand(ParameterPtr parameter, Operand::OpSemantic opSemantic, int opMask = Operand::OPM_ALL, int indirectionLevel = 0);

	/** Return the function name */
	const String& getFunctionName() const { return mFunctionName; }

	/** Return the return type */
	const String& getReturnType() const { return mReturnType; }

    /** Determines if the current object is equal to the compared one. */
    bool operator == ( const FunctionInvocation& rhs ) const;

    /** Determines if the current object is not equal to the compared one. */
    bool operator != ( const FunctionInvocation& rhs ) const;

    /** Determines if the current object is less than the compared one. */
    bool operator <  ( const FunctionInvocation& rhs ) const;

    /** Comparator function to be used for sorting.
        Implemented as a struct to make it easier for the compiler to inline
    */
    struct FunctionInvocationLessThan
    {
        bool operator()(FunctionInvocation const& lhs, FunctionInvocation const& rhs) const;
    };

    /** Comparator function to be used for comparisons.
        Implemented as a struct to make it easier for the compiler to inline
    */
    struct FunctionInvocationCompare
    {
        bool operator()(FunctionInvocation const& lhs, FunctionInvocation const& rhs) const;
    };

	/// The type of this class.
	static String Type;

	// Attributes.
protected:	
	String mFunctionName;
	String mReturnType;
	OperandVector mOperands;	
};

typedef vector<FunctionAtom*>::type					FunctionAtomInstanceList;
typedef FunctionAtomInstanceList::iterator 			FunctionAtomInstanceIterator;
typedef FunctionAtomInstanceList::const_iterator	FunctionAtomInstanceConstIterator;

/** @} */
/** @} */

}
}

#endif