#ifndef _hwToonShader_NV20
#define _hwToonShader_NV20

//-
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///////////////////////////////////////////////////////////////////
//
// NOTE: PLEASE READ THE README.TXT FILE FOR INSTRUCTIONS ON
// COMPILING AND USAGE REQUIREMENTS.
//
// DESCRIPTION: NV20-specific (Geforce3) sample shader.
//				<fill up later>
//
//  This shader builds on the foundation demonstrated in the 
//  hwUnlitShader.
//
//
///////////////////////////////////////////////////////////////////

#include <maya/MPxHwShaderNode.h>
#include "MTextureCache.h"


class hwToonShader_NV20 : public MPxHwShaderNode
{
public:
                    hwToonShader_NV20();
    virtual         ~hwToonShader_NV20();
	void			releaseEverything();

    virtual MStatus compute( const MPlug&, MDataBlock& );
	virtual void    postConstructor();

	virtual MStatus	bind(const MDrawRequest& request,
						 M3dView& view);

	virtual MStatus	unbind(const MDrawRequest& request,
						   M3dView& view);

	virtual MStatus	geometry( const MDrawRequest& request,
							  M3dView& view,
							  int prim,
							  unsigned int writable,
							  int indexCount,
							  const unsigned int * indexArray,
							  int vertexCount,
							  const int * vertexIDs,
							  const float * vertexArray,
							  int normalCount,
							  const float ** normalArrays,
							  int colorCount,
							  const float ** colorArrays,
							  int texCoordCount,
							  const float ** texCoordArrays);

	virtual int		normalsPerVertex();

	virtual int		texCoordsPerVertex();

    static  void *  creator();
    static  MStatus initialize();
    static  MTypeId id;

	MTextureCache	*m_pTextureCache;

	void			loadVertexProgramGL();
	float*			computeBinormals(int indexCount, const unsigned int * indexArray, 
									 int vertexCount, const float* vertexArray, 
									 const float* normalsArray, 
									 const float* texCoordsArray);

	bool			fVertexProgramsLoaded;
	GLuint			fVertexProgramDirectional;
	GLuint			fVertexProgramPointDecay;
	GLuint			fVertexProgramPointNoDecay;

	void			printGlError( const char *call );

	void			init_ext(const char *ext);
	MStatus			getFloat3(MObject colorAttr, float colorValue[3]);
	MStatus			getString(MObject attr, MString &str);

	vec3f			lightRotation;
	vec3f			cameraPos;

	boolean			isDirectionalLight;	// when light's rotation is on the lightPos attr
	boolean			isNonAmbientLight; // Has a decay rate 

protected:
    static MObject  colorR;
	static MObject  colorG;
	static MObject  colorB;
	static MObject  color;
    static MObject  lightModelR;
	static MObject  lightModelG;
	static MObject  lightModelB;
	static MObject  lightModel;
	static MObject	cameraX;
	static MObject	cameraY;
	static MObject	cameraZ;
	static MObject	camera;
    static MObject  uCoord;
	static MObject  vCoord;
	static MObject  uvCoord;
    static MObject  uBias;
	static MObject  vBias;
    static MObject  uvFilterSize;
    static MObject  uvFilterSizeX;
    static MObject  uvFilterSizeY;

    static MObject  shininess;
	static MObject  lightColorR;
	static MObject  lightColorG;
	static MObject  lightColorB;
	static MObject  lightColor;

	static MObject  decalTextureName;
	static MObject	lightModelTextureName;


	// Shininess value/scale, used to generate the lookup texture.
	float currentShininessValue, currentShininessScale;
	tex_object_2D *lookup_texture;
	unsigned char *lookup_table;
	static const unsigned int lookup_texture_size;
	bool fLookupTextureReprocessed;

	// Bind the look-up texture in the current GL texture unit.
	// This function automatically calls make_lookup_texture,
	// and reloads the texture in video memory if it needs to.
	void bind_lookup_table();

	// Release the memory occupied by the look-up texture.
	void release_lookup_texture();

	// Callbacks that we monitor so we can release OpenGL-dependant resources before
	// their context gets destroyed.
	MCallbackId fBeforeNewCB;
	MCallbackId fBeforeOpenCB;
	MCallbackId fBeforeRemoveReferenceCB;
	MCallbackId fMayaExitingCB;

	void attachSceneCallbacks();
	void detachSceneCallbacks();

	static void releaseCallback(void* clientData);
};

#endif /* _hwToonShader_NV20 */