NaCl VS Add-in hello_world_gles example

visual_studio/NativeClientVSAddIn/InstallerResources/examples/hello_world_gles/hello_world_gles/matrix.h

+#ifndef EXAMPLES_HELLO_WORLD_GLES_MATRIX_H
+#define EXAMPLES_HELLO_WORLD_GLES_MATRIX_H
+
+/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/** @file matrix.cc
+ * Implements simple matrix manipulation functions.
+ */
+
+//-----------------------------------------------------------------------------
+#define _USE_MATH_DEFINES 1
+#include <limits.h>
+#include <math.h>
+#include <GLES2/gl2.h>
+
+typedef GLfloat Matrix_t[16];
+
+/// Since GLES2 doesn't have all the nifty matrix transform functions that GL
+/// has, we emulate some of them here for the sake of sanity from:
+/// http://www.opengl.org/wiki/GluPerspective_code
+void glhFrustumf2(Matrix_t mat, GLfloat left, GLfloat right, GLfloat bottom,
+                  GLfloat top, GLfloat znear, GLfloat zfar);
+
+void glhPerspectivef2(Matrix_t mat, GLfloat fovyInDegrees,
+                      GLfloat aspectRatio, GLfloat znear, GLfloat zfar);
+
+
+void identity_matrix(Matrix_t mat);
+void multiply_matrix(const Matrix_t a, const Matrix_t b, Matrix_t mat);
+void rotate_matrix(GLfloat x_deg, GLfloat y_deg, GLfloat z_deg, Matrix_t mat);
+void translate_matrix(GLfloat x, GLfloat y, GLfloat z, Matrix_t mat);
+
+#endif  // EXAMPLES_HELLO_WORLD_GLES_MATRIX_H
+