remove engine dir

source/transform.h

@@ -0,0 +1,45 @@
+#ifndef TRANSFORM_H
+#define TRANSFORM_H
+
+#include "HandmadeMath.h"
+
+typedef struct transform {
+  HMM_Vec3 pos;
+  HMM_Vec3 scale;
+  HMM_Quat rotation;
+  HMM_Mat4 cache;
+  int dirty;
+} transform;
+
+transform *make_transform();
+void transform_apply(transform *t);
+void transform_free(transform *t);
+
+#define VEC2_FMT "[%g,%g]"
+#define VEC2_MEMS(s) (s).x, (s).y
+
+#define TR_FMT "(pos) " HMMFMT_VEC3 " scale " HMMFMT_VEC3
+#define TR_PRINT(tr) HMMPRINT_VEC3(tr->pos), HMMPRINT_VEC3(tr->scale)
+
+void transform_move(transform *t, HMM_Vec3 v);
+HMM_Vec3 transform_direction(transform *t, HMM_Vec3 dir);
+
+/* Transform a position via the matrix */
+HMM_Vec2 mat_t_pos(HMM_Mat3 m, HMM_Vec2 pos);
+/* Transform a direction via the matrix - does not take into account translation of matrix */
+HMM_Vec2 mat_t_dir(HMM_Mat3 m, HMM_Vec2 dir);
+
+HMM_Vec2 mat_up(HMM_Mat3 m);
+HMM_Vec2 mat_right(HMM_Mat3 m);
+float vec_angle(HMM_Vec2 a, HMM_Vec2 b);
+float vec_dirangle(HMM_Vec2 a, HMM_Vec2 b);
+
+HMM_Vec3 mat3_t_pos(HMM_Mat4 m, HMM_Vec3 pos);
+HMM_Vec3 mat3_t_dir(HMM_Mat4 m, HMM_Vec3 dir);
+
+HMM_Mat4 transform2mat(transform *t);
+transform mat2transform(HMM_Mat4 m);
+
+HMM_Quat angle2rotation(float angle);
+
+#endif