apiMeshShape/apiMeshGeometryOverride.h

//-
// ==========================================================================
// 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.
// ==========================================================================
//+

//
// apiMeshGeometryOverride.h
//
// Handles vertex data preparation for drawing the user defined shape in
// Viewport 2.0.
//

#include <maya/MPxGeometryOverride.h>
#include <maya/MIntArray.h>
#include <maya/MStateManager.h>
#include <maya/MTextureManager.h>
#include <set>

class apiMesh;
class apiMeshGeom;
namespace MHWRender
{
    class MIndexBuffer;
    class MVertexBuffer;
    class MVertexBufferDescriptor;
}

class apiMeshGeometryOverride : public MHWRender::MPxGeometryOverride
{
public:
    static MPxGeometryOverride* Creator(const MObject& obj)
    {
        return new apiMeshGeometryOverride(obj);
    }

    virtual ~apiMeshGeometryOverride();

    virtual MHWRender::DrawAPI supportedDrawAPIs() const;

    virtual void updateDG();
    virtual void updateRenderItems(
        const MDagPath& path,
        MHWRender::MRenderItemList& list);
    virtual void populateGeometry(
        const MHWRender::MGeometryRequirements& requirements,
        const MHWRender::MRenderItemList& renderItems,
        MHWRender::MGeometry& data);
    virtual void cleanUp();

    virtual void updateSelectionGranularity(
        const MDagPath& path,
        MHWRender::MSelectionContext& selectionContext);

    virtual bool traceCallSequence() const;
    virtual void handleTraceMessage( const MString &message ) const;

    static MStatus registerComponentConverters();
    static MStatus deregisterComponentConverters();

protected:
    void printShader(MHWRender::MShaderInstance* shader);
    void setSolidColor(MHWRender::MShaderInstance* shaderInstance, const float *value);
    void setSolidPointSize(MHWRender::MShaderInstance* shaderInstance, float value);
    void setLineWidth(MHWRender::MShaderInstance* shaderInstance, float lineWidth);
    bool enableActiveComponentDisplay(const MDagPath &path) const;

    // Render item handling methods
    void updateDormantAndTemplateWireframeItems(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateActiveWireframeItem(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateWireframeModeFaceCenterItem(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateShadedModeFaceCenterItem(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateDormantVerticesItem(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateActiveVerticesItem(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateVertexNumericItems(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateAffectedComponentItems(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateSelectionComponentItems(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);
    void updateProxyShadedItem(const MDagPath& path, MHWRender::MRenderItemList& list, const MHWRender::MShaderManager* shaderMgr);

    // Data stream (geometry requirements) handling
    void updateGeometryRequirements(const MHWRender::MGeometryRequirements& requirements,
        MHWRender::MGeometry& data,
        unsigned int activeVertexCount,
        unsigned int totalVerts,
        bool debugPopulateGeometry);

    void cloneVertexBuffer(
        MHWRender::MVertexBuffer* srcBuffer,
        MHWRender::MGeometry& data,
        MHWRender::MVertexBufferDescriptor& desc,
        unsigned int bufferSize,
        bool debugPopulateGeometry);

    // Indexing for render item handling methods
    void updateIndexingForWireframeItems(MHWRender::MIndexBuffer* wireIndexBuffer,
        const MHWRender::MRenderItem* item,
        MHWRender::MGeometry& data,
        unsigned int totalVerts);
    void updateIndexingForDormantVertices(const MHWRender::MRenderItem* item, MHWRender::MGeometry& data, unsigned int numTriangles);
    void updateIndexingForFaceCenters(const MHWRender::MRenderItem* item, MHWRender::MGeometry& data, bool debugPopulateGeometry);
    void updateIndexingForVertices(const MHWRender::MRenderItem* item, 
        MHWRender::MGeometry& data,
        unsigned int numTriangles,
        unsigned int activeVertexCount,
        bool debugPopulateGeometry);
    void updateIndexingForEdges(const MHWRender::MRenderItem* item,
        MHWRender::MGeometry& data, 
        unsigned int totalVerts,
        bool fromSelection);
    void updateIndexingForFaces(const MHWRender::MRenderItem* item,
        MHWRender::MGeometry& data, 
        unsigned int numTriangles,
        bool fromSelection);
    void updateIndexingForShadedTriangles(const MHWRender::MRenderItem* item,
        MHWRender::MGeometry& data, 
        unsigned int numTriangles);

    apiMeshGeometryOverride(const MObject& obj);

    apiMesh* fMesh;
    apiMeshGeom* fMeshGeom;
    MIntArray fActiveVertices;
    std::set<int> fActiveVerticesSet;
    std::set<int> fActiveEdgesSet;
    std::set<int> fActiveFacesSet;
    bool fCastsShadows;
    bool fReceivesShadows;

    // Render item names
    static const MString sWireframeItemName;
    static const MString sShadedTemplateItemName;
    static const MString sSelectedWireframeItemName;
    static const MString sVertexItemName;
    static const MString sActiveVertexItemName;
    static const MString sVertexIdItemName;
    static const MString sVertexPositionItemName;
    static const MString sShadedModeFaceCenterItemName;
    static const MString sWireframeModeFaceCenterItemName;
    static const MString sShadedProxyItemName;
    static const MString sAffectedEdgeItemName;
    static const MString sAffectedFaceItemName;
    static const MString sEdgeSelectionItemName;
    static const MString sFaceSelectionItemName;

    // Stream names used for filling in different data
    // for different streams required for different render items,
    // and toggle to choose whether to use name streams
    //
    static const MString sActiveVertexStreamName;
    bool fDrawSharedActiveVertices;
    bool fDrawActiveVerticesWithRamp;
    MHWRender::MTexture *fColorRemapTexture;
    const MHWRender::MSamplerState* fLinearSampler;

    //Vertex stream for face centers which is calculated from faces.
    static const MString sFaceCenterStreamName;
    bool fDrawFaceCenters;

    // Custom color option
    bool fUseCustomColors;

    // Proxy shader. Fallback shader to use when no shader is assigned
    // if set to < 0 then will use a fragment shader
    int fProxyShader;

    // Test overrides on shaded mode render items
    bool fInternalItems_NoShadowCast;
    bool fInternalItems_NoShadowReceive;
    bool fInternalItems_NoPostEffects;
    bool fExternalItems_NoShadowCast;
    bool fExternalItems_NoShadowReceive;
    bool fExternalItems_NoPostEffects;
    bool fExternalItemsNonTri_NoShadowCast;
    bool fExternalItemsNonTri_NoShadowReceive;
    bool fExternalItemsNonTri_NoPostEffects;
};