native_client_sdk/src/examples/api/graphics_3d/matrix.h

   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