//
//-
// ==========================================================================
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// rights reserved.
// 
// The coded instructions, statements, computer programs, and/or related 
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// copied or duplicated, in whole or in part, without the prior written 
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// ==========================================================================
//+
//
// CLASS:    MGeometryPrimitive
//
// *****************************************************************************
//
// CLASS DESCRIPTION (MGeometryPrimitive)
//
// MGeometryPrimitive is a class describes the topology used for accessing MGeometryData.
//
// Topology is specified as a set of index values which references into data elements
// in an MGeometryData. Index values can be assumed to be stored in contiguous memory.
//
// A "draw primitive type" indicates the format of the indexing as follows:
//
//		- kPoint : individual unconnected points.
//		- kLine : individual unconnected line segments.
//		- kLineStrip : connected line strip.
//		- kLineLoop : closed line loop.
//		- kTriangle : filled triangle.
//		- kTriangleStrip : filled triangle strip.
//		- kTriangleFan : filled triangle fan
//		- kQuad : filled quadrilateral (quad).
//		- kQuadStrip : filled quad strip.
//		- kPolygon : filled N-sided polygon
//
// Internal Maya data which is passed to the user via this class is always assumed to be
// non-modifiable. If modified stability cannot be ensured.
//
// *****************************************************************************

#if defined __cplusplus

// *****************************************************************************

// INCLUDED HEADER FILES

#ifndef _MGeometryPrimitive
#define _MGeometryPrimitive

#include <maya/MTypes.h>
#include <maya/MGeometryData.h>

class MHardwareRenderer;
class MGeometry;

// *****************************************************************************

// CLASS DECLARATION (MGeometryPrimitive)

/// Geometric index container (OpenMayaRender) (OpenMayaRender.py)
/**
This class is a geometric index container
*/
#ifdef _WIN32
#pragma warning(disable: 4522)
#endif // _WIN32

class OPENMAYARENDER_EXPORT MGeometryPrimitive
{
public:
	/// Specifies the data primitive type constructed by the indexing array
	///
	enum DrawPrimitiveType {
		/// Default value is not valid
		kInvalidIndexType = 0,	    
		/// Corresponds to GL_POINTS in OpenGL
		kPoints,						
		/// Corresponds to GL_LINES in OpenGL (individual unconnected line segments)
		kLines,		    	
		/// Corresponds to GL_LINE_STRIP in OpenGL
		kLineStrip,	    	
		/// Corresponds to GL_LINE_LOOP	in OpenGL (non-filled, connected line segments)
		kLineLoop,	    	
		/// Corresponds to GL_TRIANGLES In OpenGL
		kTriangles,	    	
		/// Corresponds to GL_TRIANGLE_STRIP in OpenGL
		kTriangleStrip,	    
		/// Corresponds to GL_TRIANGLE_FAN in OpenGL
		kTriangleFan,		
		/// Corresponds to GL_QUADS in OpenGL
		kQuads,	    		
		/// Corresponds to GL_QUAD_STRIP in OpenGL
		kQuadStrip,	    	
		/// Corresponds to GL_POLYGON in OpenGL
		kPolygon,		    
		kMaxDrawPrimitiveTypeIndex	// Valid entries are < kMaxDrawModeIndex
	};

	/// Destructor
	///
	~MGeometryPrimitive();

	///
	int				uniqueID() const;	
	///
	DrawPrimitiveType drawPrimitiveType() const;
	///
    unsigned int	elementCount() const;
	///
	MGeometryData::ElementType dataType() const;
	///
    const void *	data() const;

protected:
	// Default constructor is protected
	MGeometryPrimitive();
	MGeometryPrimitive(void *);
	//
	// Data destructor is protected
	void release();

	friend class MGeometry;
	friend class MHardwareRenderer;

	void *_pGeometryIndex;

private:
// No private members

};

#endif
#endif // _MGeometryPrimitive