# Additions

- libpicasso (shader compiling)
- linearAllocator template (for std::vector)
- palladium vec and mat api
- iron (2d renderer)

source/maths/mat.cpp

@@ -0,0 +1,121 @@
+/*
+MIT License
+
+Copyright (c) 2024 - 2025 tobid7
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+
+#include <amethyst/maths/mat.hpp>
+
+namespace amy {
+mat4 mat4::rotateX(float a) {
+  float c = std::cos(a);
+  float s = std::sin(a);
+  mat4 ret = identity();
+  ret(1, 1) = c;
+  ret(1, 2) = -s;
+  ret(2, 1) = s;
+  ret(2, 2) = c;
+  return ret;
+}
+
+mat4 mat4::rotateY(float a) {
+  float c = std::cos(a);
+  float s = std::sin(a);
+  mat4 ret = identity();
+  ret(0, 0) = c;
+  ret(0, 2) = s;
+  ret(2, 0) = -s;
+  ret(2, 2) = c;
+  return ret;
+}
+
+mat4 mat4::rotateZ(float a) {
+  float c = std::cos(a);
+  float s = std::sin(a);
+  mat4 ret = identity();
+  ret(0, 0) = c;
+  ret(0, 1) = -s;
+  ret(1, 0) = s;
+  ret(1, 1) = c;
+  return ret;
+}
+
+mat4 mat4::rotate(fvec3 axis, float a) {
+  float s = std::sin(a);
+  float c = std::cos(a);
+  float t = 1.f - c;
+  axis = axis.Normalize();
+  float x = axis.x;
+  float y = axis.y;
+  float z = axis.z;
+  mat4 ret = identity();
+  ret(0, 0) = t * x * x + c;
+  ret(0, 1) = t * x * y - z * s;
+  ret(0, 2) = t * x * z + y * s;
+
+  ret(1, 0) = t * x * y + z * s;
+  ret(1, 1) = t * y * y + c;
+  ret(1, 2) = t * y * z - x * s;
+
+  ret(2, 0) = t * x * z - y * s;
+  ret(2, 1) = t * y * z + x * s;
+  ret(2, 2) = t * z * z + c;
+  return ret;
+}
+
+mat4 mat4::perspective(float fov, float aspect, float n, float f) {
+  float _fov = std::tan(fov / 2.f);
+  mat4 ret;
+  ret(0, 0) = 1.f / (aspect * _fov);
+  ret(1, 1) = 1.f / _fov;
+#ifdef __3DS__
+  ret(2, 3) = f * n / (n - f);
+  ret(2, 2) = -(-1.f) * n / (n - f);
+#else
+  ret(2, 2) = -(f + n) / (f - n);
+  ret(2, 3) = -(2.f * f * n) / (f - n);
+#endif
+  ret(3, 2) = -1.f;
+  ret(3, 3) = 0.0f;
+  return ret;
+}
+
+mat4 mat4::lookAt(const fvec3& pos, const fvec3& center, const fvec3& up) {
+  auto f = fvec3(center - pos).Normalize();
+  auto s = f.Cross(up).Normalize();
+  auto u = s.Cross(f);
+
+  mat4 ret = identity();
+  ret(0, 0) = s.x;
+  ret(0, 1) = s.y;
+  ret(0, 2) = s.z;
+  ret(1, 0) = u.x;
+  ret(1, 1) = u.y;
+  ret(1, 2) = u.z;
+  ret(2, 0) = -f.x;
+  ret(2, 1) = -f.y;
+  ret(2, 2) = -f.z;
+  ret(0, 3) = -s.Dot(pos);
+  ret(1, 3) = -u.Dot(pos);
+  ret(2, 3) = f.Dot(pos);
+  return ret;
+}
+}  // namespace amy