compositor: move matrix code to separate files
Move matrix code to separate files to allow writing unit tests for it.
Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
diff --git a/src/matrix.c b/src/matrix.c
new file mode 100644
index 0000000..c71471f
--- /dev/null
+++ b/src/matrix.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of the copyright holders not be used in
+ * advertising or publicity pertaining to distribution of the software
+ * without specific, written prior permission. The copyright holders make
+ * no representations about the suitability of this software for any
+ * purpose. It is provided "as is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
+ * CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <GLES2/gl2.h>
+#include <wayland-server.h>
+
+#include "matrix.h"
+
+/*
+ * Matrices are stored in column-major order, that is the array indices are:
+ * 0 4 8 12
+ * 1 5 9 13
+ * 2 6 10 14
+ * 3 7 11 15
+ */
+
+WL_EXPORT void
+weston_matrix_init(struct weston_matrix *matrix)
+{
+ static const struct weston_matrix identity = {
+ { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 }
+ };
+
+ memcpy(matrix, &identity, sizeof identity);
+}
+
+/* m <- n * m, that is, m is multiplied on the LEFT. */
+WL_EXPORT void
+weston_matrix_multiply(struct weston_matrix *m, const struct weston_matrix *n)
+{
+ struct weston_matrix tmp;
+ const GLfloat *row, *column;
+ div_t d;
+ int i, j;
+
+ for (i = 0; i < 16; i++) {
+ tmp.d[i] = 0;
+ d = div(i, 4);
+ row = m->d + d.quot * 4;
+ column = n->d + d.rem;
+ for (j = 0; j < 4; j++)
+ tmp.d[i] += row[j] * column[j * 4];
+ }
+ memcpy(m, &tmp, sizeof tmp);
+}
+
+WL_EXPORT void
+weston_matrix_translate(struct weston_matrix *matrix, GLfloat x, GLfloat y, GLfloat z)
+{
+ struct weston_matrix translate = {
+ { 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, x, y, z, 1 }
+ };
+
+ weston_matrix_multiply(matrix, &translate);
+}
+
+WL_EXPORT void
+weston_matrix_scale(struct weston_matrix *matrix, GLfloat x, GLfloat y, GLfloat z)
+{
+ struct weston_matrix scale = {
+ { x, 0, 0, 0, 0, y, 0, 0, 0, 0, z, 0, 0, 0, 0, 1 }
+ };
+
+ weston_matrix_multiply(matrix, &scale);
+}
+
+/* v <- m * v */
+WL_EXPORT void
+weston_matrix_transform(struct weston_matrix *matrix, struct weston_vector *v)
+{
+ int i, j;
+ struct weston_vector t;
+
+ for (i = 0; i < 4; i++) {
+ t.f[i] = 0;
+ for (j = 0; j < 4; j++)
+ t.f[i] += v->f[j] * matrix->d[i + j * 4];
+ }
+
+ *v = t;
+}