drawingCoord.h

//
// Copyright 2016 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//
#ifndef PXR_IMAGING_HD_DRAWING_COORD_H
#define PXR_IMAGING_HD_DRAWING_COORD_H

#include "pxr/pxr.h"
#include "pxr/imaging/hd/api.h"
#include "pxr/imaging/hd/version.h"
#include "pxr/base/tf/diagnostic.h"
#include <stdint.h>

PXR_NAMESPACE_OPEN_SCOPE

class HdDrawingCoord {
public:
    static const int CustomSlotsBegin = 8;
    static const int DefaultNumSlots = 3; /* Constant, Vertex, Topology */
    static const int Unassigned = -1;

    HdDrawingCoord() :
        // default slots:
        _topology(2),
        _instancePrimvar(Unassigned),
        _constantPrimvar(0),
        _vertexPrimvar(1),
        _elementPrimvar(3),
        _instanceIndex(4),
        _faceVaryingPrimvar(5),
        _topologyVisibility(6),
        _varyingPrimvar(7) {
    }

    int GetConstantPrimvarIndex() const    { return _constantPrimvar; }
    void SetConstantPrimvarIndex(int slot) { _constantPrimvar = slot; }
    int GetVertexPrimvarIndex() const      { return _vertexPrimvar; }
    void SetVertexPrimvarIndex(int slot)   { _vertexPrimvar = slot; }
    int GetTopologyIndex() const           { return _topology; }
    void SetTopologyIndex(int slot)        { _topology = slot; }
    int GetElementPrimvarIndex() const     { return _elementPrimvar; }
    void SetElementPrimvarIndex(int slot)  { _elementPrimvar = slot; }
    int GetInstanceIndexIndex() const      { return _instanceIndex; }
    void SetInstanceIndexIndex(int slot)   { _instanceIndex = slot; }
    int GetFaceVaryingPrimvarIndex() const    { return _faceVaryingPrimvar; }
    void SetFaceVaryingPrimvarIndex(int slot) { _faceVaryingPrimvar = slot; }
    int GetTopologyVisibilityIndex() const    { return _topologyVisibility; }
    void SetTopologyVisibilityIndex(int slot) { _topologyVisibility = slot; }
    int GetVaryingPrimvarIndex() const      { return _varyingPrimvar; }
    void SetVaryingPrimvarIndex(int slot)   { _varyingPrimvar = slot; }

    // instance primvars take up a range of slots.
    void SetInstancePrimvarBaseIndex(int slot) { _instancePrimvar = slot; }
    int GetInstancePrimvarIndex(int level) const {
        TF_VERIFY(_instancePrimvar != Unassigned);
        return _instancePrimvar + level;
    }

private:
    int16_t _topology;
    int16_t _instancePrimvar;
    int8_t _constantPrimvar;
    int8_t _vertexPrimvar;
    int8_t _elementPrimvar;
    int8_t _instanceIndex;
    int8_t _faceVaryingPrimvar;
    int8_t _topologyVisibility;
    int8_t _varyingPrimvar;
};


PXR_NAMESPACE_CLOSE_SCOPE

#endif  // PXR_IMAGING_HD_DRAWING_COORD_H