diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/physac.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/physac.h b/src/physac.h index dd2b1628..ea8801c3 100644 --- a/src/physac.h +++ b/src/physac.h @@ -177,6 +177,18 @@ PHYSACDEF Rectangle TransformToRectangle(Transform transform); #endif #include <math.h> // Required for: cos(), sin(), abs(), fminf() +#include <stdint.h> // Required for typedef unsigned long long int uint64_t, used by hi-res timer +#include <pthread.h> // Required for: pthread_create() +#include "utils.h" // Required for: TraceLog() + +#if defined(PLATFORM_DESKTOP) + // Functions required to query time on Windows + int __stdcall QueryPerformanceCounter(unsigned long long int *lpPerformanceCount); + int __stdcall QueryPerformanceFrequency(unsigned long long int *lpFrequency); +#elif defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) + #include <sys/time.h> // Required for: timespec + #include <time.h> // Required for: clock_gettime() +#endif //---------------------------------------------------------------------------------- // Defines and Macros @@ -195,6 +207,9 @@ PHYSACDEF Rectangle TransformToRectangle(Transform transform); //---------------------------------------------------------------------------------- // Global Variables Definition //---------------------------------------------------------------------------------- +static bool physicsThreadEnabled = false; // Physics calculations thread exit control +static uint64_t baseTime; // Base time measure for hi-res timer +static double currentTime, previousTime; // Used to track timmings static PhysicBody physicBodies[MAX_PHYSIC_BODIES]; // Physic bodies pool static int physicBodiesCount; // Counts current enabled physic bodies static Vector2 gravityForce; // Gravity force @@ -202,6 +217,9 @@ static Vector2 gravityForce; // Gravity f //---------------------------------------------------------------------------------- // Module specific Functions Declaration //---------------------------------------------------------------------------------- +static void* PhysicsThread(void *arg); // Physics calculations thread function +static void InitTimer(void); // Initialize hi-resolution timer +static double GetCurrentTime(void); // Time measure returned are microseconds static float Vector2DotProduct(Vector2 v1, Vector2 v2); // Returns the dot product of two Vector2 static float Vector2Length(Vector2 v); // Returns the length of a Vector2 @@ -215,6 +233,10 @@ PHYSACDEF void InitPhysics(Vector2 gravity) // Initialize physics variables physicBodiesCount = 0; gravityForce = gravity; + + // Create physics thread + pthread_t tid; + pthread_create(&tid, NULL, &PhysicsThread, NULL); } // Update physic objects, calculating physic behaviours and collisions detection @@ -592,6 +614,9 @@ PHYSACDEF void UpdatePhysics(double deltaTime) // Unitialize all physic objects and empty the objects pool PHYSACDEF void ClosePhysics() { + // Exit physics thread loop + physicsThreadEnabled = false; + // Free all dynamic memory allocations for (int i = 0; i < physicBodiesCount; i++) PHYSAC_FREE(physicBodies[i]); @@ -710,6 +735,65 @@ PHYSACDEF Rectangle TransformToRectangle(Transform transform) //---------------------------------------------------------------------------------- // Module specific Functions Definition //---------------------------------------------------------------------------------- +// Physics calculations thread function +static void* PhysicsThread(void *arg) +{ + // Initialize thread loop state + physicsThreadEnabled = true; + + // Initialize hi-resolution timer + InitTimer(); + + // Physics update loop + while (physicsThreadEnabled) + { + currentTime = GetCurrentTime(); + double deltaTime = (double)(currentTime - previousTime); + previousTime = currentTime; + + // Delta time value needs to be inverse multiplied by physics time step value (1/target fps) + UpdatePhysics(deltaTime/PHYSICS_TIMESTEP); + } + + return NULL; +} + +// Initialize hi-resolution timer +static void InitTimer(void) +{ +#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) + struct timespec now; + + if (clock_gettime(CLOCK_MONOTONIC, &now) == 0) // Success + { + baseTime = (uint64_t)now.tv_sec*1000000000LLU + (uint64_t)now.tv_nsec; + } + else TraceLog(WARNING, "No hi-resolution timer available"); +#endif + + previousTime = GetCurrentTime(); // Get time as double +} + +// Time measure returned are microseconds +static double GetCurrentTime(void) +{ +#if defined(PLATFORM_DESKTOP) + unsigned long long int clockFrequency, currentTime; + + QueryPerformanceFrequency(&clockFrequency); + QueryPerformanceCounter(¤tTime); + + return (double)(currentTime/clockFrequency); +#endif + +#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) + struct timespec ts; + clock_gettime(CLOCK_MONOTONIC, &ts); + uint64_t time = (uint64_t)ts.tv_sec*1000000000LLU + (uint64_t)ts.tv_nsec; + + return (double)(time - baseTime)*1e-9; +#endif +} // Returns the dot product of two Vector2 static float Vector2DotProduct(Vector2 v1, Vector2 v2) |