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/*
* Copyright © 2018 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "igt_core.h"
#include "igt_matrix.h"
/**
* SECTION:igt_matrix
* @short_description: Matrix math library
* @title: Matrix
* @include: igt.h
*
* This library contains helper functions for basic matrix math.
* The library operates on #igt_mat4 and #igt_vec4 structures.
*/
/**
* igt_matrix_print:
* @m: the matrix
*
* Print out the matrix elements.
*/
void igt_matrix_print(const struct igt_mat4 *m)
{
for (int row = 0; row < 4; row++) {
igt_info("|");
for (int col = 0; col < 4; col++) {
igt_info("%4.4f,", m->d[m(row, col)]);
}
igt_info("|\n");
}
}
/**
* igt_matrix_identity:
*
* Returns:
* An identity matrix.
*/
struct igt_mat4 igt_matrix_identity(void)
{
static const struct igt_mat4 ret = {
.d[m(0, 0)] = 1.0f,
.d[m(1, 1)] = 1.0f,
.d[m(2, 2)] = 1.0f,
.d[m(3, 3)] = 1.0f,
};
return ret;
}
/**
* igt_matrix_scale:
*
* Returns:
* An scaling matrix.
*/
struct igt_mat4 igt_matrix_scale(float x, float y, float z)
{
struct igt_mat4 ret = {
.d[m(0, 0)] = x,
.d[m(1, 1)] = y,
.d[m(2, 2)] = z,
.d[m(3, 3)] = 1.0f,
};
return ret;
}
/**
* igt_matrix_translate:
*
* Returns:
* A translation matrix.
*/
struct igt_mat4 igt_matrix_translate(float x, float y, float z)
{
struct igt_mat4 ret = {
.d[m(0, 0)] = 1.0f,
.d[m(1, 1)] = 1.0f,
.d[m(2, 2)] = 1.0f,
.d[m(0, 3)] = x,
.d[m(1, 3)] = y,
.d[m(2, 3)] = z,
.d[m(3, 3)] = 1.0f,
};
return ret;
}
/**
* igt_matrix_multiply:
*
* Multiply two matrices together. @a is on the left,
* @b on the right.
*
* Returns:
* The resulting matrix.
*/
struct igt_mat4 igt_matrix_multiply(const struct igt_mat4 *a,
const struct igt_mat4 *b)
{
struct igt_mat4 ret = {};
for (int col = 0; col < 4; col++) {
for (int row = 0; row < 4; row++) {
for (int i = 0; i < 4; i++)
ret.d[m(row, col)] += a->d[m(row, i)] * b->d[m(i, col)];
}
}
return ret;
}
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