fix image pattern rendering

1 files changed, 51 insertions, 0 deletions

diff --git a/src/util/mat3.cpp b/src/util/mat3.cpp
new file mode 100644
index 0000000000..38858d2385
--- /dev/null
+++ b/src/util/mat3.cpp
@@ -0,0 +1,51 @@
+// This is an incomplete port of http://glmatrix.net/
+//
+// Copyright (c) 2013 Brandon Jones, Colin MacKenzie IV
+//
+// This software is provided 'as-is', without any express or implied warranty.
+// In no event will the authors be held liable for any damages arising from the
+// use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not claim
+//    that you wrote the original software. If you use this software in a
+//    product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source distribution.
+
+#include <mbgl/util/mat3.hpp>
+
+#include <cmath>
+
+using namespace mbgl;
+
+void matrix::identity(mat3& out) {
+    out[0] = 1.0f;
+    out[1] = 0.0f;
+    out[2] = 0.0f;
+    out[3] = 0.0f;
+    out[4] = 1.0f;
+    out[5] = 0.0f;
+    out[6] = 0.0f;
+    out[7] = 0.0f;
+    out[8] = 1.0f;
+}
+
+void matrix::scale(mat3& out, const mat3& a, const float x, const float y) {
+    out[0] = x * a[0];
+    out[1] = x * a[1];
+    out[2] = x * a[2];
+    out[3] = y * a[3];
+    out[4] = y * a[4];
+    out[5] = y * a[5];
+    out[6] = a[6];
+    out[7] = a[7];
+    out[8] = a[8];
+}