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// -                        Open3D: www.open3d.org                            -
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// The MIT License (MIT)
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// Copyright (c) 2020 www.open3d.org
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#include "Open3D/Visualization/Rendering/MaterialModifier.h"

namespace open3d {
namespace visualization {

TextureSamplerParameters TextureSamplerParameters::Simple() {
    return TextureSamplerParameters();
}

TextureSamplerParameters TextureSamplerParameters::Pretty() {
    TextureSamplerParameters parameters;

    parameters.filter_min = TextureSamplerParameters::MinFilter::Linear;
    parameters.filter_mag = TextureSamplerParameters::MagFilter::Linear;
    parameters.SetAnisotropy(4);

    return parameters;
}

TextureSamplerParameters::TextureSamplerParameters(MagFilter min_mag,
                                                   WrapMode uvw) {
    filter_min = MinFilter(min_mag);
    filter_mag = min_mag;
    wrap_u = uvw;
    wrap_v = uvw;
    wrap_w = uvw;
}

TextureSamplerParameters::TextureSamplerParameters(MinFilter min,
                                                   MagFilter mag,
                                                   WrapMode uvw) {
    filter_min = min;
    filter_mag = mag;
    wrap_u = uvw;
    wrap_v = uvw;
    wrap_w = uvw;
}

TextureSamplerParameters::TextureSamplerParameters(
        MinFilter min, MagFilter mag, WrapMode u, WrapMode v, WrapMode w) {
    filter_min = min;
    filter_mag = mag;
    wrap_u = u;
    wrap_v = v;
    wrap_w = w;
}

void TextureSamplerParameters::SetAnisotropy(const std::uint8_t a) {
    anisotropy = a;
    // check is NOT power-of-two
    if (false == (a && !(a & (a - 1)))) {
        // ceil to nearest power-of-two
        anisotropy |= anisotropy >> 1;
        anisotropy |= anisotropy >> 2;
        anisotropy |= anisotropy >> 4;
        anisotropy |= anisotropy >> 8;
        anisotropy |= anisotropy >> 16;

        anisotropy = anisotropy - (anisotropy >> 1);
    }
}

}  // namespace visualization
}  // namespace open3d