christoph/cpp-masssprings
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replace openmp with thread-pool library bc openmp has larger fork boundary overhead

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Christoph Urlacher
2026-02-22 23:54:14 +01:00
parent 73b01f6af3
commit 443069f597
7 changed files with 82 additions and 30 deletions
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25
include/config.hpp
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@ -4,8 +4,8 @@
#include <raylib.h>
#define PRINT_TIMINGS
// #define WEB
#define BARNES_HUT
// #define WEB // Disables multithreading
#define BARNES_HUT // Use octree BH instead of uniform grid
// Window
constexpr int INITIAL_WIDTH = 800;
@ -30,18 +30,19 @@ constexpr float PAN_MULTIPLIER = 10.0;
constexpr float ROT_SPEED = 1.0;
// Physics Engine
constexpr float SIM_SPEED = 4.0;
constexpr float TIMESTEP = 1.0 / 60; // Do 60 physics updates per second
constexpr float MASS = 1.0;
constexpr float SPRING_CONSTANT = 5.0;
constexpr float DAMPENING_CONSTANT = 1.0;
constexpr float REST_LENGTH = 2.0;
constexpr float REPULSION_FORCE = 2.0;
constexpr float REPULSION_RANGE = 5.0 * REST_LENGTH;
constexpr float SIM_SPEED = 4.0; // How large each update should be
constexpr float TIMESTEP = 1.0 / 60; // Do 60 physics updates per second
constexpr float MASS = 1.0; // Mass spring system
constexpr float SPRING_CONSTANT = 5.0; // Mass spring system
constexpr float DAMPENING_CONSTANT = 1.0; // Mass spring system
constexpr float REST_LENGTH = 2.0; // Mass spring system
constexpr float VERLET_DAMPENING = 0.05; // [0, 1]
constexpr float BH_FORCE = 2.0; // BH: [1.0, 3.0]
constexpr float THETA = 1.0; // Barnes-Hut [0.5, ~]
constexpr float SOFTENING = 0.01; // Barnes-Hut [0.01, 1.0]
constexpr int REPULSION_GRID_REFRESH = 5; // Updates between grid rebuilds
constexpr float VERLET_DAMPENING = 0.05; // [0, 1]
constexpr float GRID_FORCE = 0.02; // Grid: [0.0, ~0.05]
constexpr float REPULSION_RANGE = 5.0 * REST_LENGTH; // Grid
constexpr int REPULSION_GRID_REFRESH = 5; // Grid rebuild freq
// Graph Drawing
constexpr float VERTEX_SIZE = 0.5;

13
include/physics.hpp
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@ -13,6 +13,10 @@
#include "octree.hpp"
#endif
#ifndef WEB
#include <BS_thread_pool.hpp>
#endif
class Mass {
public:
const float mass;
@ -71,6 +75,10 @@ private:
int last_springs_count;
#endif
#ifndef WEB
BS::thread_pool<BS::tp::none> threads;
#endif
public:
// This is the main ownership of all the states/masses/springs.
// TODO: Everything is stored multiple times but idc (currently).
@ -82,6 +90,11 @@ public:
#ifndef BARNES_HUT
last_build = REPULSION_GRID_REFRESH;
#endif
#ifndef WEB
std::cout << "Thread-Pool: " << threads.get_thread_count() << " threads."
<< std::endl;
#endif
};
MassSpringSystem(const MassSpringSystem &copy) = delete;