lib: Add igt_matrix

Add a helper library for basic matrix math.

v2: Make the identity matrix static const (Chris)
    Add the m(row,col) macro (Chris)

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 56 insertions, 0 deletions

diff --git a/lib/igt_matrix.h b/lib/igt_matrix.h
new file mode 100644
index 00000000..33acb815
--- /dev/null
+++ b/lib/igt_matrix.h
@@ -0,0 +1,56 @@
+/*
+ * 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.
+ */
+
+#ifndef __IGT_MATRIX_H__
+#define __IGT_MATRIX_H__
+
+/**
+ * igt_vec4:
+ * @d: vector elements
+ *
+ * A 4 element column vector (4x1 matrix).
+ */
+struct igt_vec4 {
+	float d[4];
+};
+
+/**
+ * igt_mat4:
+ * @d: matrix elements
+ *
+ * A 4x4 column major matrix.
+ */
+struct igt_mat4 {
+	float d[16];
+};
+
+void igt_matrix_print(const struct igt_mat4 *m);
+struct igt_mat4 igt_matrix_identity(void);
+struct igt_mat4 igt_matrix_scale(float x, float y, float z);
+struct igt_mat4 igt_matrix_translate(float x, float y, float z);
+struct igt_vec4 igt_matrix_transform(const struct igt_mat4 *m,
+				     const struct igt_vec4 *v);
+struct igt_mat4 igt_matrix_multiply(const struct igt_mat4 *a,
+				    const struct igt_mat4 *b);
+
+#endif /* __IGT_MATRIX_H__ */