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142 lines
3.2 KiB
142 lines
3.2 KiB
/*
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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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#include "igt_core.h"
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#include "igt_matrix.h"
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/**
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* SECTION:igt_matrix
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* @short_description: Matrix math library
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* @title: Matrix
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* @include: igt.h
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*
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* This library contains helper functions for basic matrix math.
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* The library operates on #igt_mat4 and #igt_vec4 structures.
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*/
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/**
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* igt_matrix_print:
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* @m: the matrix
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*
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* Print out the matrix elements.
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*/
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void igt_matrix_print(const struct igt_mat4 *m)
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{
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for (int row = 0; row < 4; row++) {
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igt_info("|");
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for (int col = 0; col < 4; col++) {
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igt_info("%4.4f,", m->d[m(row, col)]);
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}
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igt_info("|\n");
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}
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}
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/**
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* igt_matrix_identity:
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*
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* Returns:
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* An identity matrix.
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*/
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struct igt_mat4 igt_matrix_identity(void)
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{
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static const struct igt_mat4 ret = {
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.d[m(0, 0)] = 1.0f,
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.d[m(1, 1)] = 1.0f,
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.d[m(2, 2)] = 1.0f,
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.d[m(3, 3)] = 1.0f,
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};
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return ret;
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}
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/**
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* igt_matrix_scale:
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* @x: x scaling amount
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* @y: y scaling amount
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* @z: z scaling amount
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*
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* Returns:
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* An scaling matrix.
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*/
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struct igt_mat4 igt_matrix_scale(float x, float y, float z)
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{
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struct igt_mat4 ret = {
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.d[m(0, 0)] = x,
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.d[m(1, 1)] = y,
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.d[m(2, 2)] = z,
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.d[m(3, 3)] = 1.0f,
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};
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return ret;
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}
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/**
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* igt_matrix_translate:
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* @x: x translation amount
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* @y: y translation amount
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* @z: z translation amount
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*
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* Returns:
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* A translation matrix.
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*/
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struct igt_mat4 igt_matrix_translate(float x, float y, float z)
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{
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struct igt_mat4 ret = {
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.d[m(0, 0)] = 1.0f,
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.d[m(1, 1)] = 1.0f,
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.d[m(2, 2)] = 1.0f,
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.d[m(0, 3)] = x,
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.d[m(1, 3)] = y,
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.d[m(2, 3)] = z,
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.d[m(3, 3)] = 1.0f,
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};
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return ret;
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}
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/**
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* igt_matrix_multiply:
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* @a: Left matrix
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* @b: Right matrix
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*
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* Multiply two matrices together. @a is on the left,
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* @b on the right.
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*
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* Returns:
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* The resulting matrix.
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*/
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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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struct igt_mat4 ret = {};
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for (int col = 0; col < 4; col++) {
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for (int row = 0; row < 4; row++) {
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for (int i = 0; i < 4; i++)
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ret.d[m(row, col)] += a->d[m(row, i)] * b->d[m(i, col)];
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}
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}
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return ret;
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}
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