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//-----------------------------------------------------------------------------
// Name: mat3.cpp
// Developer: Wolfire Games LLC
// Description:
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// 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 "mat3.h"
#include <memory>
#include <cstring>
mat3::mat3(float val) {
entries[0] = val;
entries[4] = val;
entries[8] = val;
entries[3] = entries[2] = entries[1] = 0.0f;
entries[7] = entries[6] = entries[5] = 0.0f;
}
mat3::mat3(float e0, float e1, float e2,
float e3, float e4, float e5,
float e6, float e7, float e8) {
entries[0] = e0;
entries[1] = e1;
entries[2] = e2;
entries[3] = e3;
entries[4] = e4;
entries[5] = e5;
entries[6] = e6;
entries[7] = e7;
entries[8] = e8;
}
mat3::mat3(const float* rhs) {
memcpy(entries, rhs, sizeof(entries));
}
mat3::mat3(const mat4& m) {
entries[0] = m[0];
entries[1] = m[1];
entries[2] = m[2];
entries[3] = m[4];
entries[4] = m[5];
entries[5] = m[6];
entries[6] = m[8];
entries[7] = m[9];
entries[8] = m[10];
}
vec3 mat3::operator*(const vec3& rhs) const {
return vec3(entries[0] * rhs[0] + entries[3] * rhs[1] + entries[6] * rhs[2],
entries[1] * rhs[0] + entries[4] * rhs[1] + entries[7] * rhs[2],
entries[2] * rhs[0] + entries[5] * rhs[1] + entries[8] * rhs[2]);
}
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