d3df5eca0b
Also fix String methods' receivers to be T, not *T, so that
var m f32.Mat32
s := fmt.Sprintf("m=%v", m)
works.
LGTM=crawshaw
R=crawshaw
CC=golang-codereviews
https://golang.org/cl/147490043
54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package f32
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import "fmt"
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// A Mat3 is a 3x3 matrix of float32 values.
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// Elements are indexed first by row then column, i.e. m[row][column].
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type Mat3 [3]Vec3
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func (m Mat3) String() string {
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return fmt.Sprintf(`Mat3[% 0.3f, % 0.3f, % 0.3f,
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% 0.3f, % 0.3f, % 0.3f,
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% 0.3f, % 0.3f, % 0.3f]`,
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m[0][0], m[0][1], m[0][2],
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m[1][0], m[1][1], m[1][2],
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m[2][0], m[2][1], m[2][2])
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}
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func (m *Mat3) Identity() {
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*m = Mat3{
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{1, 0, 0},
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{0, 1, 0},
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{0, 0, 1},
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}
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}
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func (m *Mat3) Eq(n *Mat3, epsilon float32) bool {
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for i := range m {
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for j := range m[i] {
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diff := m[i][j] - n[i][j]
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if diff < -epsilon || +epsilon < diff {
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return false
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}
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}
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}
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return true
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}
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// Mul stores m0 × m1 in m.
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func (m *Mat3) Mul(m0, m1 *Mat3) {
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// If you intend to make this faster, skip the usual loop unrolling
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// games and go straight to halide/renderscript/etc.
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for i := 0; i < 3; i++ {
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for j := 0; j < 3; j++ {
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m[i][j] = m0[i][0]*m1[0][j] +
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m0[i][1]*m1[1][j] +
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m0[i][2]*m1[2][j]
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}
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}
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}
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