88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
#pragma once
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#include "../type.hpp"
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namespace gli{
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namespace detail
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{
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template <typename T, precision P, template <typename, precision> class vecType>
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inline vecType<bool, P> in_interval(vecType<T, P> const& Value, vecType<T, P> const& Min, vecType<T, P> const& Max)
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{
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return greaterThanEqual(Value, Min) && lessThanEqual(Value, Max);
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}
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template <typename extent_type, typename normalized_type>
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struct coord_nearest
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{
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extent_type Texel;
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typename extent_type::bool_type UseTexel;
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};
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template <typename extent_type, typename normalized_type>
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inline coord_nearest<extent_type, normalized_type> make_coord_nearest(extent_type const& TexelExtent, normalized_type const& SampleCoord)
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{
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normalized_type const TexelLast(normalized_type(TexelExtent) - normalized_type(1));
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coord_nearest<extent_type, normalized_type> Coord;
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Coord.Texel = extent_type(round(SampleCoord * TexelLast));
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Coord.UseTexel = in_interval(Coord.Texel, extent_type(0), TexelExtent - 1);
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return Coord;
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}
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template <typename extent_type, typename normalized_type>
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struct coord_linear
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{
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extent_type TexelFloor;
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extent_type TexelCeil;
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normalized_type Blend;
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};
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template <typename extent_type, typename normalized_type>
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struct coord_linear_border : public coord_linear<extent_type, normalized_type>
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{
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typename extent_type::bool_type UseTexelFloor;
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typename extent_type::bool_type UseTexelCeil;
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};
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template <typename extent_type, typename normalized_type>
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GLI_FORCE_INLINE coord_linear<extent_type, normalized_type> make_coord_linear(extent_type const& TexelExtent, normalized_type const& SampleCoord)
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{
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coord_linear<extent_type, normalized_type> Coord;
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normalized_type const TexelExtentF(TexelExtent);
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normalized_type const TexelLast = TexelExtentF - normalized_type(1);
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normalized_type const ScaledCoord(SampleCoord * TexelLast);
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normalized_type const ScaledCoordFloor = normalized_type(extent_type(ScaledCoord));
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normalized_type const ScaledCoordCeil = normalized_type(extent_type(ScaledCoord + normalized_type(0.5)));
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//normalized_type const ScaledCoordFloor(floor(ScaledCoord));
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//normalized_type const ScaledCoordCeil(ceil(ScaledCoord));
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Coord.Blend = ScaledCoord - ScaledCoordFloor;
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Coord.TexelFloor = extent_type(ScaledCoordFloor);
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Coord.TexelCeil = extent_type(ScaledCoordCeil);
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return Coord;
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}
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template <typename extent_type, typename normalized_type>
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GLI_FORCE_INLINE coord_linear_border<extent_type, normalized_type> make_coord_linear_border(extent_type const& TexelExtent, normalized_type const& SampleCoord)
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{
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coord_linear_border<extent_type, normalized_type> Coord;
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normalized_type const TexelExtentF(TexelExtent);
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normalized_type const TexelLast = TexelExtentF - normalized_type(1);
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normalized_type const ScaledCoord(SampleCoord * TexelLast);
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normalized_type const ScaledCoordFloor(floor(ScaledCoord));
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normalized_type const ScaledCoordCeil(ceil(ScaledCoord));
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Coord.Blend = ScaledCoord - ScaledCoordFloor;
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Coord.TexelFloor = extent_type(ScaledCoordFloor);
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Coord.TexelCeil = extent_type(ScaledCoordCeil);
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Coord.UseTexelFloor = in_interval(Coord.TexelFloor, extent_type(0), TexelExtent - 1);
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Coord.UseTexelCeil = in_interval(Coord.TexelCeil, extent_type(0), TexelExtent - 1);
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return Coord;
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}
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}//namespace detail
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}//namespace gli
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