typed-geometry

Header-only strongly typed math library for graphics and geometry.

Usage / Example

Type definitions only, no functions:

#include <typed-geometry/tg-lean.hh>

All functionality:

#include <typed-geometry/tg.hh>

tg::vec3 v;
tg::pos3 p;

// TODO

Helpers for interacting with the standard library:

#include <typed-geometry/tg-std.hh>

tg::pos3 p;
std::cout << p;                    // std::operator<<(std::ostream&, ...)
std::map<p, int> v_cnts;           // std::less
std::unordered_map<p, int> v_cnts; // std::hash

Most functionality is implemented as free functions, overloaded by type and with consistent vocabulary.

Object Types

Basically all tg provided types are regular, i.e. have value semantics like int or vector. The following categories exist:

POD types like vec and most fixed-size objects
dynamically sized non-POD values like polygon (similar to vector)
transparent types like vec where .x is part of the interface
opaque types like angle and quadric where the representation is implementation detail

Vectors

Types vec3, ivec4, dvec2, ...

normalize(a): returns normalized version of a
dot(a, b): dot product
cross(a, b): cross product
component-wise math functions: sin, cos, abs, sqrt, ...

Transformations

Matrix types mat3, imat3x4, ...
Quaternion types quat, dquat, ...
Transform types transform3, dtransform2, ...

Objects

Types pos3, iline2, ray3, dbox2, ...

Represent individual points or sets of points.

contains(a, b): true iff a contains b (i.e. if each point in b is also contained in a)
intersects(a, b): true iff a and b intersect (i.e. if at least one point is in a and in b)
intersection(a, b): returns the appropriate object describing the intersection of two objects

See docs/Objects.md for more information.

Interpolation

mix(a, b, t): linearly interpolates a and b with parameter t from 0..1.
lerp(a, b, t): same as mix
slerp(a, b, t): same as mix but with spherical interpolation (i.e. for quaternions)
smoothstep(x0, x1, x): see GLSL smoothstep
smootherstep(x0, x1, x): see GLSL smootherstep
lmap(x, {x0_from, x1_from}, {x0_to, x1_to}): linearly maps a value from one range to another

TODO: splines

Random

tg::rng rng;
auto v = uniform(rng, -1.0f, 1.0f);
auto p = uniform(rng, obj);

uniform(rng, a): uniformly samples a point from the object a
uniform(rng, a, b): same as mix(a, b, uniform(t, 0.0f, 1.0f))

Naming Scheme

foo(a, b) should read in the same order as english
if not possible, a.foo(b) should make sense (e.g. contains(a, b) is interpreted as a.contains(b))
if still ambiguous: faster changing parameters go last (e.g. coordinates(tri, point) or mix(a, b, t))

C++ 17 Features

deduction guides: auto v = tg::vec(1, 2.5f, 3), auto p = tg::pos(v);
structured binding: auto [x, y, z] = tg::vec3(...)

Dependencies

clean-core.

TODO

Benchmark how compile times are affected by includes / templates
Add tests that verify optimal assembly generated
Fractional and bigint data types

License

project-arcana/typed-geometry

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