Maya-SDK/cpp_ref/hw_phong_shader_2hw_phong_shader_8h-example.html

#ifndef _hwPhongShader

#define _hwPhongShader


//-

// ==========================================================================

// Copyright 2015 Autodesk, Inc.  All rights reserved.

//

// Use of this software is subject to the terms of the Autodesk

// license agreement provided at the time of installation or download,

// or which otherwise accompanies this software in either electronic

// or hard copy form.

// ==========================================================================

//+


//

// NOTE: PLEASE READ THE README.TXT FILE FOR INSTRUCTIONS ON

// COMPILING AND USAGE REQUIREMENTS.

//

// DESCRIPTION:

//

// Simple node that implements Phong shading for the special

// case when the light is at the eye. We use a simple

// spherical reflection environment map to compute the Phong

// highlight

//


#include <maya/MPxHwShaderNode.h>

#include <maya/MPoint.h>


// For swatch rendering

#include <maya/MHardwareRenderer.h>

#include <maya/MGeometryData.h>


class hwPhongShader : public MPxHwShaderNode

{

public:

                    hwPhongShader();

            ~hwPhongShader() override;

    void            releaseEverything();


    MStatus compute( const MPlug&, MDataBlock& ) override;

    void    postConstructor() override;


    // Internally cached attribute handling routines

    bool getInternalValue( const MPlug&, MDataHandle& )         override;

    bool setInternalValue( const MPlug&, const MDataHandle& )   override;


    // Interactive overrides

    MStatus     bind( const MDrawRequest& request,

                              M3dView& view ) override;

    MStatus     unbind( const MDrawRequest& request,

                                M3dView& view ) override;

    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,

                                const int * faceIDs,

                                const float * localUVCoord) override;


    // Batch overrides

    MStatus glBind(const MDagPath& shapePath) override;

    MStatus glUnbind(const MDagPath& shapePath) override;

    MStatus glGeometry( const MDagPath& shapePath,

                              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,

                              const int * faceIDs,

                              const float * localUVCoord) override;


    MStatus         draw(

                              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,

                              const int * faceIDs,

                              const float * localUVCoord);


    void            drawDefaultGeometry();


    // Overridden to draw an image for swatch rendering.

    MStatus renderSwatchImage( MImage & image ) override;

    void            drawTheSwatch( MGeometryData* pGeomData,

                                   unsigned int* pIndexing,

                                   unsigned int  numberOfData,

                                   unsigned int  indexCount );


    int     normalsPerVertex() override;

    int     texCoordsPerVertex() override;

    int     getTexCoordSetNames(MStringArray& names) override;


    bool    hasTransparency() override;


    bool    provideVertexIDs() override;

    bool    provideFaceIDs() override;

    bool    provideLocalUVCoord() override;


    static  void *  creator();

    static  MStatus initialize();


    MFloatVector    Phong ( double cos_a );

    void            init_Phong_texture ( void );

    unsigned int    PhongTextureId() const { return phong_map_id; }

    float           Transparency() const { return mTransparency; }

    const float3 *  Ambient() const { return &mAmbientColor; }

    const float3 *  Diffuse() const { return &mDiffuseColor; }

    const float3 *  Specular() const { return &mSpecularColor; }

    const float3 *  Shininess() const { return &mShininess; }

    void setTransparency(const float fTransparency);

    void setAmbient(const float3 &fAmbient);

    void setDiffuse(const float3 &fDiffuse);

    void setSpecular(const float3 &fSpecular);

    void setShininess(const float3 &fShininess);


    void            printGlError( const char *call );


    bool            attributesChangedVP2() { return mAttributesChangedVP2; }

    void            markAttributesChangedVP2() { mAttributesChangedVP2 = true; }

    void            markAttributesCleanVP2() { mAttributesChangedVP2 = false; }


    static  MTypeId id;


    protected:


    void attachSceneCallbacks();

    void detachSceneCallbacks();


    static void releaseCallback(void* clientData);


    private:


    // Attributes

    static MObject  aColor;

    static MObject  aDiffuseColor;

    static MObject  aSpecularColor;

    static MObject  aShininessX;

    static MObject  aShininessY;

    static MObject  aShininessZ;

    static MObject  aShininess;

    static MObject  aTransparency;

    static MObject  aGeometryShape;


    // Internal data

    GLuint          phong_map_id;


    MPoint          cameraPosWS;


    float3          mAmbientColor;

    float           mTransparency;

    float3          mDiffuseColor;

    float3          mSpecularColor;

    float3          mShininess;

    unsigned int    mGeometryShape;

    bool            mAttributesChanged; // Keep track if any attributes changed

    bool            mAttributesChangedVP2; // Keep track if any attributes changed for VP2


    // Callbacks that we monitor so we can release OpenGL-dependant

    // resources before their context gets destroyed.

    MCallbackId fBeforeNewCB;

    MCallbackId fBeforeOpenCB;

    MCallbackId fBeforeRemoveReferenceCB;

    MCallbackId fMayaExitingCB;


};


#endif /* _hwPhongShader */