/******************************************************************************
 * Copyright 2019 NVIDIA Corporation. All rights reserved.
 *****************************************************************************/
/// \file
/// \brief Scene attribute for texturing geometric primitives using a regular
///        volume dataset.

#ifndef NVIDIA_INDEX_IREGULAR_VOLUME_TEXTURE_H
#define NVIDIA_INDEX_IREGULAR_VOLUME_TEXTURE_H

#include <mi/dice.h>

#include <nv/index/iattribute.h>

namespace nv {
namespace index {

/// @ingroup nv_index_scene_description_attribute

/// The interface class representing a regular volume texture attribute.
///
class IRegular_volume_texture :
    public mi::base::Interface_declare<0xcffdcde9,0x3f88,0x4147,0xa4,0xfa,0x4b,0xc9,0xe2,0x63,0xb6,0x53,
                                       nv::index::IAttribute>
{
public:
    /// Defines how a texture access outside of the volume boundary is handled.
    enum Volume_boundary_mode
    {
        /// A texture access outside of the volume boundary will be considered fully transparent
        /// and therefore be ignored for rendering
        CLAMP_TO_TRANSPARENT = 0,
        /// A texture access outside of the volume boundary will return fully opaque white, i.e.
        /// RGBA [1.0, 1.0, 1.0, 1.0], which may be further modulated by a material property.
        CLAMP_TO_OPAQUE      = 1,
    };

    /// Sets the reference to the regular volume scene element to be used as the texturing source.
    ///
    /// \param[in] elem_tag     Tag of an IRegular_volume scene element.
    ///
    virtual void set_volume_element(mi::neuraylib::Tag_struct elem_tag) = 0;

    /// Returns the reference to the regular volume scene element.
    ///
    /// \return Tag of an IRegular_volume scene element.
    ///
    virtual mi::neuraylib::Tag_struct get_volume_element() const = 0;

    /// Sets the mode for handling textures accesses outside of the volume boundary.
    ///
    /// \param[in] mode Volume boundary mode
    virtual void set_volume_boundary_mode(Volume_boundary_mode mode) = 0;

    /// Returns the mode for handling texture accesses outside of the volume boundary.
    ///
    /// \return Current volume boundary mode
    virtual Volume_boundary_mode get_volume_boundary_mode() const = 0;
};

} // namespace index
} // namespace nv

#endif // NVIDIA_INDEX_IREGULAR_VOLUME_TEXTURE_H
