98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/*
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* Copyright © 2018 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __IGT_MATRIX_H__
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#define __IGT_MATRIX_H__
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/**
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* igt_vec4:
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* @d: vector elements
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*
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* A 4 element column vector (4x1 matrix).
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*/
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struct igt_vec4 {
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float d[4];
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};
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/**
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* igt_mat4:
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* @d: matrix elements
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*
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* A 4x4 column major matrix.
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*/
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struct igt_mat4 {
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float d[16];
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};
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#define m(row, col) ((col) * 4 + (row))
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void igt_matrix_print(const struct igt_mat4 *m);
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struct igt_mat4 igt_matrix_identity(void);
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struct igt_mat4 igt_matrix_scale(float x, float y, float z);
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struct igt_mat4 igt_matrix_translate(float x, float y, float z);
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struct igt_mat4 igt_matrix_multiply(const struct igt_mat4 *a,
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const struct igt_mat4 *b);
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/**
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* igt_matrix_transform:
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* @m: The matrix
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* @v: The vector
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*
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* Transform the vector @v by the matrix @m. @m is on the left,
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* @v on the right.
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*
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* Returns:
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* The transformed vector.
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*/
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static inline struct igt_vec4
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igt_matrix_transform(const struct igt_mat4 *m,
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const struct igt_vec4 *v)
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{
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struct igt_vec4 ret = {
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.d = { m->d[m(0, 0)] * v->d[0] +
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m->d[m(0, 1)] * v->d[1] +
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m->d[m(0, 2)] * v->d[2] +
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m->d[m(0, 3)] * v->d[3],
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m->d[m(1, 0)] * v->d[0] +
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m->d[m(1, 1)] * v->d[1] +
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m->d[m(1, 2)] * v->d[2] +
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m->d[m(1, 3)] * v->d[3],
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m->d[m(2, 0)] * v->d[0] +
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m->d[m(2, 1)] * v->d[1] +
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m->d[m(2, 2)] * v->d[2] +
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m->d[m(2, 3)] * v->d[3],
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m->d[m(3, 0)] * v->d[0] +
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m->d[m(3, 1)] * v->d[1] +
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m->d[m(3, 2)] * v->d[2] +
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m->d[m(3, 3)] * v->d[3],
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},
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};
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return ret;
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}
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#endif /* __IGT_MATRIX_H__ */
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