103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
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/*
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* Copyright © 2011 Intel Corporation
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the copyright holders not be used in
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* advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The copyright holders make
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <string.h>
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#include <stdlib.h>
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#include <GLES2/gl2.h>
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#include <wayland-server.h>
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#include "matrix.h"
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/*
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* Matrices are stored in column-major order, that is the array indices are:
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* 0 4 8 12
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* 1 5 9 13
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* 2 6 10 14
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* 3 7 11 15
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*/
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WL_EXPORT void
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weston_matrix_init(struct weston_matrix *matrix)
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{
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static const struct weston_matrix identity = {
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{ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 }
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};
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memcpy(matrix, &identity, sizeof identity);
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}
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/* m <- n * m, that is, m is multiplied on the LEFT. */
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WL_EXPORT void
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weston_matrix_multiply(struct weston_matrix *m, const struct weston_matrix *n)
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{
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struct weston_matrix tmp;
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const GLfloat *row, *column;
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div_t d;
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int i, j;
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for (i = 0; i < 16; i++) {
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tmp.d[i] = 0;
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d = div(i, 4);
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row = m->d + d.quot * 4;
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column = n->d + d.rem;
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for (j = 0; j < 4; j++)
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tmp.d[i] += row[j] * column[j * 4];
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}
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memcpy(m, &tmp, sizeof tmp);
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}
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WL_EXPORT void
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weston_matrix_translate(struct weston_matrix *matrix, GLfloat x, GLfloat y, GLfloat z)
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{
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struct weston_matrix translate = {
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{ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, x, y, z, 1 }
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};
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weston_matrix_multiply(matrix, &translate);
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}
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WL_EXPORT void
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weston_matrix_scale(struct weston_matrix *matrix, GLfloat x, GLfloat y, GLfloat z)
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{
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struct weston_matrix scale = {
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{ x, 0, 0, 0, 0, y, 0, 0, 0, 0, z, 0, 0, 0, 0, 1 }
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};
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weston_matrix_multiply(matrix, &scale);
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}
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/* v <- m * v */
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WL_EXPORT void
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weston_matrix_transform(struct weston_matrix *matrix, struct weston_vector *v)
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{
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int i, j;
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struct weston_vector t;
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for (i = 0; i < 4; i++) {
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t.f[i] = 0;
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for (j = 0; j < 4; j++)
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t.f[i] += v->f[j] * matrix->d[i + j * 4];
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}
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*v = t;
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}
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