rk_engine/cpp/math.cpp

// Copyright (C) 2022 RozK
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "math.hpp"

//TODO: benchmark this ctypes interface against pure python maths

void rk_mat3_rotation(
    rk_mat3 & ret,
    rk_vec3 const & axis,
    float const angle) {
    ret = glm::mat3_cast(glm::angleAxis(angle, axis));
}

void rk_mat3_mul_vec3(
    rk_vec3 & ret,
    rk_mat3 const & a,
    rk_vec3 const & b) {
    ret = a * b;
}

void rk_mat3_mul_mat3(
    rk_mat3 & ret,
    rk_mat3 const & a,
    rk_mat3 const & b) {
    ret = a * b;
}

void rk_mat4_projection(
    rk_mat4 & ret,
    float hfov,
    float ratio,
    float near,
    float far) {
    ret = glm::perspectiveRH(hfov, ratio, near, far);
}

void rk_mat4_lookat(
    rk_mat4 & ret,
    rk_vec3 const & position,
    rk_vec3 const & lookat) {
    ret = glm::lookAtRH(position, lookat, glm::vec3(0.0f, 0.0f, 1.0f));
}

void rk_mat4_mul_vec3(
    rk_vec3 & ret,
    rk_mat4 const & a,
    rk_vec3 const & b,
    float const w) {
    ret = glm::vec3(a * glm::vec4(b, w));
}

void rk_mat4_mul_vec4(
    rk_vec4 & ret,
    rk_mat4 const & a,
    rk_vec4 const & b) {
    ret = a * b;
}

void rk_mat4_mul_mat4(
    rk_mat4 & ret,
    rk_mat4 const & a,
    rk_mat4 const & b) {
    ret = a * b;
}