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-rw-r--r--src/mbgl/util/vec4.cpp33
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diff --git a/src/mbgl/util/vec4.cpp b/src/mbgl/util/vec4.cpp
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--- a/src/mbgl/util/vec4.cpp
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-// 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/vec4.hpp>
-
-using namespace mbgl;
-
-void matrix::transformMat4(vec4& out, vec4& a, mat4& m) {
- double x = a[0], y = a[1], z = a[2], w = a[3];
- out[0] = m[0] * x + m[4] * y + m[8] * z + m[12] * w;
- out[1] = m[1] * x + m[5] * y + m[9] * z + m[13] * w;
- out[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
- out[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;
-}