1 #ifndef EXAMPLES_HELLO_WORLD_GLES_MATRIX_H 2 #define EXAMPLES_HELLO_WORLD_GLES_MATRIX_H 3 4 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 /** @file matrix.cc 10 * Implements simple matrix manipulation functions. 11 */ 12 13 //----------------------------------------------------------------------------- 14 #define _USE_MATH_DEFINES 1 15 #include <limits.h> 16 #include <math.h> 17 #include <GLES2/gl2.h> 18 19 typedef GLfloat Matrix_t[16]; 20 21 /// Since GLES2 doesn't have all the nifty matrix transform functions that GL 22 /// has, we emulate some of them here for the sake of sanity from: 23 /// http://www.opengl.org/wiki/GluPerspective_code 24 void glhFrustumf2(Matrix_t mat, 25 GLfloat left, 26 GLfloat right, 27 GLfloat bottom, 28 GLfloat top, 29 GLfloat znear, 30 GLfloat zfar); 31 32 void glhPerspectivef2(Matrix_t mat, 33 GLfloat fovyInDegrees, 34 GLfloat aspectRatio, 35 GLfloat znear, 36 GLfloat zfar); 37 38 void identity_matrix(Matrix_t mat); 39 void multiply_matrix(const Matrix_t a, const Matrix_t b, Matrix_t mat); 40 void rotate_matrix(GLfloat x_deg, GLfloat y_deg, GLfloat z_deg, Matrix_t mat); 41 void translate_matrix(GLfloat x, GLfloat y, GLfloat z, Matrix_t mat); 42 43 #endif // EXAMPLES_HELLO_WORLD_GLES_MATRIX_H 44
