kopia lustrzana https://github.com/jameshball/osci-render
89 wiersze
3.5 KiB
C++
89 wiersze
3.5 KiB
C++
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// L=============================================================================
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// L This software is distributed under the MIT license.
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// L Copyright 2021 Péter Kardos
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// L=============================================================================
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#pragma once
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#include "../Matrix/MatrixImpl.hpp"
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#include "../Vector.hpp"
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#include "IdentityBuilder.hpp"
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namespace mathter {
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template <class T, int Dim, bool Packed>
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class OrthographicBuilder {
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static_assert(!std::is_integral_v<T>);
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using VectorT = Vector<T, Dim, Packed>;
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public:
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OrthographicBuilder(const VectorT& minBounds, const VectorT& maxBounds, T projNearPlane, T projFarPlane)
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: minBounds(minBounds), maxBounds(maxBounds), projNearPlane(projNearPlane), projFarPlane(projFarPlane) {}
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OrthographicBuilder& operator=(const OrthographicBuilder&) = delete;
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template <class U, eMatrixOrder Order, eMatrixLayout Layout, bool MPacked>
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operator Matrix<U, Dim + 1, Dim + 1, Order, Layout, MPacked>() const {
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Matrix<U, Dim + 1, Dim + 1, Order, Layout, MPacked> m;
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Set(m);
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return m;
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}
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template <class U, eMatrixLayout Layout, bool MPacked>
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operator Matrix<U, Dim, Dim + 1, eMatrixOrder::PRECEDE_VECTOR, Layout, MPacked>() const {
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Matrix<U, Dim, Dim + 1, eMatrixOrder::PRECEDE_VECTOR, Layout, MPacked> m;
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Set(m);
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return m;
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}
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template <class U, eMatrixLayout Layout, bool MPacked>
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operator Matrix<U, Dim + 1, Dim, eMatrixOrder::FOLLOW_VECTOR, Layout, MPacked>() const {
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Matrix<U, Dim + 1, Dim, eMatrixOrder::FOLLOW_VECTOR, Layout, MPacked> m;
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Set(m);
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return m;
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}
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private:
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template <class U, int Rows, int Columns, eMatrixOrder Order, eMatrixLayout Layout, bool MPacked>
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void Set(Matrix<U, Rows, Columns, Order, Layout, MPacked>& m) const {
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using VectorT = Vector<T, Dim, Packed>;
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VectorT volumeSize = maxBounds - minBounds;
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VectorT scale = T(2) / volumeSize;
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scale[scale.Dimension() - 1] *= T(0.5) * (projFarPlane - projNearPlane);
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VectorT offset = -(maxBounds + minBounds) / T(2) * scale;
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offset[offset.Dimension() - 1] += (projFarPlane + projNearPlane) / 2;
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m = Identity();
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for (int i = 0; i < scale.Dimension(); ++i) {
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m(i, i) = scale(i);
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(Order == eMatrixOrder::FOLLOW_VECTOR ? m(scale.Dimension(), i) : m(i, scale.Dimension())) = offset(i);
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}
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}
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const Vector<T, Dim, Packed> minBounds, maxBounds;
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T projNearPlane, projFarPlane;
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};
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/// <summary> Creates an orthographics projection matrix. The volume before projection
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/// is an axis-aligned hypercube and it is projected onto a unit hypercube. </summary>
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/// <param name="minBounds"> The "left" corner of the hypercube. </param>
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/// <param name="maxBounds"> The "right" corner of the hypercube. </param>
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/// <param name="projNearPlane"> The lower bound of the last axis of the projected volume (Z axis in 3D). </param>
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/// <param name="projFarPlane"> The upper bound of the last axis of the projected volume (Z axis in 3D). </param>
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/// <remarks> After projection, all axes range from -1 to 1, except for the last axis, which is specified explicitly. </remarks>
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template <class T, int Dim, bool Packed>
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auto Orthographic(const Vector<T, Dim, Packed>& minBounds, const Vector<T, Dim, Packed>& maxBounds, T projNearPlane, T projFarPlane) {
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if constexpr (std::is_integral_v<T>) {
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using VectorT = Vector<float, Dim, false>;
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return OrthographicBuilder(VectorT(minBounds), VectorT(maxBounds), float(projNearPlane), float(projFarPlane));
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}
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else {
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return OrthographicBuilder(minBounds, maxBounds, projNearPlane, projFarPlane);
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}
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}
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} // namespace mathter
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