ppapi_simple

native_client_sdk/src/examples/hello_world_instance3d/matrix.cc

-/* 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.
- */
-
-//-----------------------------------------------------------------------------
-#include <stdlib.h>
-#include <string.h>
-#include "matrix.h"
-#define deg_to_rad(x) (x * (M_PI / 180.0f))
-
-void glhFrustumf2(Matrix_t mat,
-                  GLfloat left,
-                  GLfloat right,
-                  GLfloat bottom,
-                  GLfloat top,
-                  GLfloat znear,
-                  GLfloat zfar) {
-  float temp, temp2, temp3, temp4;
-  temp = 2.0f * znear;
-  temp2 = right - left;
-  temp3 = top - bottom;
-  temp4 = zfar - znear;
-  mat[0] = temp / temp2;
-  mat[1] = 0.0f;
-  mat[2] = 0.0f;
-  mat[3] = 0.0f;
-  mat[4] = 0.0f;
-  mat[5] = temp / temp3;
-  mat[6] = 0.0f;
-  mat[7] = 0.0f;
-  mat[8] = (right + left) / temp2;
-  mat[9] = (top + bottom) / temp3;
-  mat[10] = (-zfar - znear) / temp4;
-  mat[11] = -1.0f;
-  mat[12] = 0.0f;
-  mat[13] = 0.0f;
-  mat[14] = (-temp * zfar) / temp4;
-  mat[15] = 0.0f;
-}
-
-void glhPerspectivef2(Matrix_t mat,
-                      GLfloat fovyInDegrees,
-                      GLfloat aspectRatio,
-                      GLfloat znear,
-                      GLfloat zfar) {
-  float ymax, xmax;
-  ymax = znear * tanf(fovyInDegrees * 3.14f / 360.0f);
-  xmax = ymax * aspectRatio;
-  glhFrustumf2(mat, -xmax, xmax, -ymax, ymax, znear, zfar);
-}
-
-void identity_matrix(Matrix_t mat) {
-  memset(mat, 0, sizeof(Matrix_t));
-  mat[0] = 1.0;
-  mat[5] = 1.0;
-  mat[10] = 1.0;
-  mat[15] = 1.0;
-}
-
-void multiply_matrix(const Matrix_t a, const Matrix_t b, Matrix_t mat) {
-  // Generate to a temporary first in case the output matrix and input
-  // matrix are the same.
-  Matrix_t out;
-
-  out[0] = a[0] * b[0] + a[4] * b[1] + a[8] * b[2] + a[12] * b[3];
-  out[1] = a[1] * b[0] + a[5] * b[1] + a[9] * b[2] + a[13] * b[3];
-  out[2] = a[2] * b[0] + a[6] * b[1] + a[10] * b[2] + a[14] * b[3];
-  out[3] = a[3] * b[0] + a[7] * b[1] + a[11] * b[2] + a[15] * b[3];
-
-  out[4] = a[0] * b[4] + a[4] * b[5] + a[8] * b[6] + a[12] * b[7];
-  out[5] = a[1] * b[4] + a[5] * b[5] + a[9] * b[6] + a[13] * b[7];
-  out[6] = a[2] * b[4] + a[6] * b[5] + a[10] * b[6] + a[14] * b[7];
-  out[7] = a[3] * b[4] + a[7] * b[5] + a[11] * b[6] + a[15] * b[7];
-
-  out[8] = a[0] * b[8] + a[4] * b[9] + a[8] * b[10] + a[12] * b[11];
-  out[9] = a[1] * b[8] + a[5] * b[9] + a[9] * b[10] + a[13] * b[11];
-  out[10] = a[2] * b[8] + a[6] * b[9] + a[10] * b[10] + a[14] * b[11];
-  out[11] = a[3] * b[8] + a[7] * b[9] + a[11] * b[10] + a[15] * b[11];
-
-  out[12] = a[0] * b[12] + a[4] * b[13] + a[8] * b[14] + a[12] * b[15];
-  out[13] = a[1] * b[12] + a[5] * b[13] + a[9] * b[14] + a[13] * b[15];
-  out[14] = a[2] * b[12] + a[6] * b[13] + a[10] * b[14] + a[14] * b[15];
-  out[15] = a[3] * b[12] + a[7] * b[13] + a[11] * b[14] + a[15] * b[15];
-
-  memcpy(mat, out, sizeof(Matrix_t));
-}
-
-void rotate_x_matrix(GLfloat x_rad, Matrix_t mat) {
-  identity_matrix(mat);
-  mat[5] = cosf(x_rad);
-  mat[6] = -sinf(x_rad);
-  mat[9] = -mat[6];
-  mat[10] = mat[5];
-}
-
-void rotate_y_matrix(GLfloat y_rad, Matrix_t mat) {
-  identity_matrix(mat);
-  mat[0] = cosf(y_rad);
-  mat[2] = sinf(y_rad);
-  mat[8] = -mat[2];
-  mat[10] = mat[0];
-}
-
-void rotate_z_matrix(GLfloat z_rad, Matrix_t mat) {
-  identity_matrix(mat);
-  mat[0] = cosf(z_rad);
-  mat[1] = sinf(z_rad);
-  mat[4] = -mat[1];
-  mat[5] = mat[0];
-}
-
-void rotate_matrix(GLfloat x_deg, GLfloat y_deg, GLfloat z_deg, Matrix_t mat) {
-  GLfloat x_rad = (GLfloat) deg_to_rad(x_deg);
-  GLfloat y_rad = (GLfloat) deg_to_rad(y_deg);
-  GLfloat z_rad = (GLfloat) deg_to_rad(z_deg);
-
-  Matrix_t x_matrix;
-  Matrix_t y_matrix;
-  Matrix_t z_matrix;
-
-  rotate_x_matrix(x_rad, x_matrix);
-  rotate_y_matrix(y_rad, y_matrix);
-  rotate_z_matrix(z_rad, z_matrix);
-
-  Matrix_t xy_matrix;
-  multiply_matrix(y_matrix, x_matrix, xy_matrix);
-  multiply_matrix(z_matrix, xy_matrix, mat);
-}
-
-void translate_matrix(GLfloat x, GLfloat y, GLfloat z, Matrix_t mat) {
-  identity_matrix(mat);
-  mat[12] += x;
-  mat[13] += y;
-  mat[14] += z;
-}