isect2d
Collision detection algorithms, using basic tile grid for broad-phase and separating axes theorem (SAT) for narrow-phase.
Example
// Provide your own vector 2d implementation
#ifdef USE_GLM
using Vec2 = glm::vec2;
#else
using Vec2 = isect2d::Vec2;
#endif
std::vector<isect2d::OBB> obbs;
std::vector<isect2d::AABB> aabbs;
// Init the set of OBBs from the AABBs set
for (auto& obb : obbs) {
auto aabb = obb.getExtent();
aabbs.push_back(aabb);
}Using the Isect2D context
isect2d::ISect2D<Vec2> context({16, 16}, {800, 600});
context.clear();
// Broadphase
context.intersect(aabbs);
// Narrow-phase
for (auto& pair : context.pairs) {
if (intersect(obbs[pair.first], obbs[pair.second])) {
// Both oriented bounding boxes collide
}
}Using the naive grid based implementation
// Broadphase
auto pairs = intersect(
aabbs,
{4, 4}, // split resolution
{800, 600}, // screen resolution
);
// Narrow-phase
for (auto& pair : pairs) {
if (intersect(obbs[pair.first], obbs[pair.second])) {
// Both oriented bounding boxes collide
}
}