Function SampleCubemap

SampleFramework12/v1.00/Graphics/Textures.h:122–162

}

template<typename T> static DirectX::XMVECTOR SampleCubemap(Float3 direction, const TextureData<T>& texData)
{
    Assert_(texData.NumSlices == 6);

    float maxComponent = std::max(std::max(std::abs(direction.x), std::abs(direction.y)), std::abs(direction.z));
    uint32 faceIdx = 0;
    Float2 uv = Float2(direction.y, direction.z);
    if(direction.x == maxComponent)
    {
        faceIdx = 0;
        uv = Float2(-direction.z, -direction.y) / direction.x;
    }
    else if(-direction.x == maxComponent)
    {
        faceIdx = 1;
        uv = Float2(direction.z, -direction.y) / -direction.x;
    }
    else if(direction.y == maxComponent)
    {
        faceIdx = 2;
        uv = Float2(direction.x, direction.z) / direction.y;
    }
    else if(-direction.y == maxComponent)
    {
        faceIdx = 3;
        uv = Float2(direction.x, -direction.z) / -direction.y;
    }
    else if(direction.z == maxComponent)
    {
        faceIdx = 4;
        uv = Float2(direction.x, -direction.y) / direction.z;
    }
    else if(-direction.z == maxComponent)
    {
        faceIdx = 5;
        uv = Float2(-direction.x, -direction.y) / -direction.z;
    }

    uv = uv * Float2(0.5f, 0.5f) + Float2(0.5f, 0.5f);
    return SampleTexture2D(uv, faceIdx, texData);
}

}