Flipper/Applications/Official/source-OLDER/xMasterX/airmouse/tracking/util/matrix_4x4.cc

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2022-12-29 06:30:12 +00:00
/*
* Copyright 2019 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "matrix_4x4.h"
#include <algorithm>
#include <cmath>
#include <cstring>
namespace cardboard {
Matrix4x4 Matrix4x4::Identity()
{
Matrix4x4 ret;
for (int j = 0; j < 4; ++j) {
for (int i = 0; i < 4; ++i) {
ret.m[j][i] = (i == j) ? 1 : 0;
}
}
return ret;
}
Matrix4x4 Matrix4x4::Zeros()
{
Matrix4x4 ret;
for (int j = 0; j < 4; ++j) {
for (int i = 0; i < 4; ++i) {
ret.m[j][i] = 0;
}
}
return ret;
}
Matrix4x4 Matrix4x4::Translation(float x, float y, float z)
{
Matrix4x4 ret = Matrix4x4::Identity();
ret.m[3][0] = x;
ret.m[3][1] = y;
ret.m[3][2] = z;
return ret;
}
Matrix4x4 Matrix4x4::Perspective(const std::array<float, 4>& fov, float zNear, float zFar)
{
Matrix4x4 ret = Matrix4x4::Zeros();
const float xLeft = -std::tan(fov[0] * M_PI / 180.0f) * zNear;
const float xRight = std::tan(fov[1] * M_PI / 180.0f) * zNear;
const float yBottom = -std::tan(fov[2] * M_PI / 180.0f) * zNear;
const float yTop = std::tan(fov[3] * M_PI / 180.0f) * zNear;
const float X = (2 * zNear) / (xRight - xLeft);
const float Y = (2 * zNear) / (yTop - yBottom);
const float A = (xRight + xLeft) / (xRight - xLeft);
const float B = (yTop + yBottom) / (yTop - yBottom);
const float C = (zNear + zFar) / (zNear - zFar);
const float D = (2 * zNear * zFar) / (zNear - zFar);
ret.m[0][0] = X;
ret.m[2][0] = A;
ret.m[1][1] = Y;
ret.m[2][1] = B;
ret.m[2][2] = C;
ret.m[3][2] = D;
ret.m[2][3] = -1;
return ret;
}
void Matrix4x4::ToArray(float* array) const { std::memcpy(array, &m[0][0], 16 * sizeof(float)); }
} // namespace cardboard