32 lines
810 B
C++
32 lines
810 B
C++
#pragma once
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#include <plot/core/types.hpp>
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namespace plot::math {
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/// Column-major 3x3 matrix of `f32`, the layout OpenGL expects for `mat3`
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/// uniforms.
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struct Mat3 {
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f32 m[9] = {1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f};
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static constexpr Mat3 identity() noexcept { return Mat3{}; }
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/// Column-major product `(*this) * rhs`.
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constexpr Mat3 operator*(const Mat3& rhs) const noexcept {
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Mat3 out{0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f};
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for (usize col = 0; col < 3; ++col) {
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for (usize row = 0; row < 3; ++row) {
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f32 acc = 0.0f;
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for (usize k = 0; k < 3; ++k) acc += m[k * 3 + row] * rhs.m[col * 3 + k];
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out.m[col * 3 + row] = acc;
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}
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}
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return out;
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}
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};
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} // namespace plot::math
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namespace plot {
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using math::Mat3;
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}
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