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87 lines
3.2 KiB
87 lines
3.2 KiB
#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 <length_t L, typename T, precision P> |
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inline vec<L, bool, P> in_interval(vec<L, T, P> const& Value, vec<L, T, P> const& Min, vec<L, 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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