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Review physac timming system

pull/432/head
raysan5 7 years ago
parent
0bb90d21c6
commit
f44dbf21cf
1 changed files with 79 additions and 59 deletions
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  1. +79
    -59
      src/physac.h

+ 79
- 59
src/physac.h View File

@ -43,16 +43,15 @@
* NOTE 2: Physac requires static C library linkage to avoid dependency on MinGW DLL (-static -lpthread)
*
* Use the following code to compile:
* gcc -o physac_sample.exe physac_sample.c -s $(RAYLIB_DIR)\raylib\raylib_icon -static -lraylib -lpthread \
* -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm -std=c99 -Wl,--subsystem,windows -Wl,-allow-multiple-definition
* gcc -o $(NAME_PART).exe $(FILE_NAME) -s icon\physac_icon -static -lraylib -lpthread -lopengl32 -lgdi32 -std=c99
*
* VERY THANKS TO:
* Ramón Santamaria (@raysan5)
* Ramon Santamaria (github: @raysan5)
*
*
* LICENSE: zlib/libpng
*
* Copyright (c) 2016-2017 Victor Fisac
* Copyright (c) 2016-2017 Victor Fisac (github: @victorfisac)
*
* This software is provided "as-is", without any express or implied warranty. In no event
* will the authors be held liable for any damages arising from the use of this software.
@ -235,22 +234,6 @@ PHYSACDEF void ClosePhysics(void);
#if defined(PHYSAC_IMPLEMENTATION)
#if defined(_WIN32)
// 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(__linux__) || defined(__APPLE__) || defined(PLATFORM_WEB))
#if _POSIX_C_SOURCE < 199309L
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199309L // Required for CLOCK_MONOTONIC if compiled with c99 without gnu ext.
#endif
//#define _DEFAULT_SOURCE // Enables BSD function definitions and C99 POSIX compliance
#include <sys/time.h> // Required for: timespec
#include <time.h> // Required for: clock_gettime()
#include <stdint.h>
#endif
#if !defined(PHYSAC_NO_THREADS)
#include <pthread.h> // Required for: pthread_t, pthread_create()
#endif
@ -261,8 +244,27 @@ PHYSACDEF void ClosePhysics(void);
#include <stdlib.h> // Required for: malloc(), free(), srand(), rand()
#include <math.h> // Required for: cosf(), sinf(), fabs(), sqrtf()
#include <stdint.h> // Required for: uint64_t
#if !defined(PHYSAC_STANDALONE)
#include "raymath.h" // Required for: Vector2Add(), Vector2Subtract()
#endif
#include "raymath.h" // Required for: Vector2Add(), Vector2Subtract()
// Time management functionality
#if defined(_WIN32)
// 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(__linux__)
#if _POSIX_C_SOURCE < 199309L
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199309L // Required for CLOCK_MONOTONIC if compiled with c99 without gnu ext.
#endif
#include <sys/time.h> // Required for: timespec
#include <time.h> // Required for: clock_gettime()
#elif defined(__APPLE__) // macOS also defines __MACH__
#include <mach/mach_time.h> // Required for: mach_absolute_time()
#endif
//----------------------------------------------------------------------------------
// Defines and Macros
@ -285,12 +287,13 @@ static pthread_t physicsThreadId; // Physics thread id
#endif
static unsigned int usedMemory = 0; // Total allocated dynamic memory
static bool physicsThreadEnabled = false; // Physics thread enabled state
static double currentTime = 0; // Current time in milliseconds
#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) || defined(__linux__) || defined(__APPLE__) || defined(PLATFORM_WEB)
static double baseTime = 0; // Android and RPI platforms base time
#endif
static double baseTime = 0; // Offset time for MONOTONIC clock
static double startTime = 0; // Start time in milliseconds
static double deltaTime = 0; // Delta time used for physics steps
static double currentTime = 0; // Current time in milliseconds
static uint64_t frequency = 0.0; // Hi-res clock frequency
static double accumulator = 0; // Physics time step delta time accumulator
static unsigned int stepsCount = 0; // Total physics steps processed
static Vector2 gravityForce = { 0, 9.81f/1000 }; // Physics world gravity force
@ -324,8 +327,10 @@ static int Clip(Vector2 normal, float clip, Vector2 *faceA, Vector2 *faceB);
static bool BiasGreaterThan(float valueA, float valueB); // Check if values are between bias range
static Vector2 TriangleBarycenter(Vector2 v1, Vector2 v2, Vector2 v3); // Returns the barycenter of a triangle given by 3 points
static void InitTimer(void); // Initializes hi-resolution timer
static double GetCurrentTime(void); // Get current time in milliseconds
static void InitTimer(void); // Initializes hi-resolution MONOTONIC timer
static uint64_t GetTimeCount(void); // Get hi-res MONOTONIC time measure in seconds
static double GetCurrentTime(void); // // Get hi-res MONOTONIC time measure in seconds
static int GetRandomNumber(int min, int max); // Returns a random number between min and max (both included)
// Math functions
@ -341,10 +346,10 @@ static Vector2 Vector2Add(Vector2 v1, Vector2 v2);
static Vector2 Vector2Subtract(Vector2 v1, Vector2 v2); // Returns the subtract of two given vectors
#endif
static Mat2 Mat2Radians(float radians); // Creates a matrix 2x2 from a given radians value
static kr">inline Mat2 Mat2Radians(float radians); // Creates a matrix 2x2 from a given radians value
static void Mat2Set(Mat2 *matrix, float radians); // Set values from radians to a created matrix 2x2
static Mat2 Mat2Transpose(Mat2 matrix); // Returns the transpose of a given matrix 2x2
static Vector2 Mat2MultiplyVector2(Mat2 matrix, Vector2 vector); // Multiplies a vector by a matrix 2x2
static kr">inline Mat2 Mat2Transpose(Mat2 matrix); // Returns the transpose of a given matrix 2x2
static kr">inline Vector2 Mat2MultiplyVector2(Mat2 matrix, Vector2 vector); // Multiplies a vector by a matrix 2x2
//----------------------------------------------------------------------------------
// Module Functions Definition
@ -352,15 +357,15 @@ static Vector2 Mat2MultiplyVector2(Mat2 matrix, Vector2 vector);
// Initializes physics values, pointers and creates physics loop thread
PHYSACDEF void InitPhysics(void)
{
#if defined(PHYSAC_DEBUG)
printf("[PHYSAC] physics module initialized successfully\n");
#endif
#if !defined(PHYSAC_NO_THREADS)
// NOTE: if defined, user will need to create a thread for PhysicsThread function manually
// Create physics thread using POSIXS thread libraries
pthread_create(&physicsThreadId, NULL, &PhysicsLoop, NULL);
#endif
#if defined(PHYSAC_DEBUG)
printf("[PHYSAC] physics module initialized successfully\n");
#endif
}
// Returns true if physics thread is currently enabled
@ -1024,7 +1029,7 @@ static PolygonData CreateRectanglePolygon(Vector2 pos, Vector2 size)
static void *PhysicsLoop(void *arg)
{
#if defined(PHYSAC_DEBUG)
printf("[PHYSAC] physics thread created with successfully\n");
printf("[PHYSAC] physics thread created successfully\n");
#endif
// Initialize physics loop thread values
@ -1884,42 +1889,56 @@ static Vector2 TriangleBarycenter(Vector2 v1, Vector2 v2, Vector2 v3)
return result;
}
// Initializes hi-resolution timer
// Initializes hi-resolution MONOTONIC timer
static void InitTimer(void)
{
srand(time(NULL)); // Initialize random seed
#if defined(_WIN32)
QueryPerformanceFrequency((unsigned long long int *) &frequency);
#endif
#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI)
struct timespec now;
if (clock_gettime(CLOCK_MONOTONIC, &now) == 0) baseTime = (uint64_t)now.tv_sec*1000000000LLU + (uint64_t)now.tv_nsec;
#endif
#if defined(__linux__)
struct timespec now;
if (clock_gettime(CLOCK_MONOTONIC, &now) == 0) frequency = 1000000000;
#endif
startTime = GetCurrentTime();
#if defined(__APPLE__)
mach_timebase_info_data_t timebase;
mach_timebase_info(&timebase);
frequency = (timebase.denom*1e9)/timebase.numer;
#endif
baseTime = GetTimeCount(); // Get MONOTONIC clock time offset
startTime = GetCurrentTime(); // Get current time
}
// Get current time in milliseconds
static double GetCurrentTime(void)
// Get hi-res MONOTONIC time measure in seconds
static n">uint64_t GetTimeCount(void)
{
double time = 0;
#if defined(_WIN32)
unsigned long long int clockFrequency, currentTime;
QueryPerformanceFrequency(&clockFrequency);
QueryPerformanceCounter(&currentTime);
uint64_t value;
#if defined(_WIN32)
QueryPerformanceCounter((unsigned long long int *) &value);
#endif
time = (double)((double)currentTime/clockFrequency)*1000;
#endif
#if defined(__linux__)
struct timespec now;
clock_gettime(CLOCK_MONOTONIC, &now);
value = (uint64_t)now.tv_sec*(uint64_t)1000000000 + (uint64_t)now.tv_nsec;
#endif
#if defined(PLATFORM_ANDROID) || defined(PLATFORM_RPI) || defined(__linux__) || defined(__APPLE__) || defined(PLATFORM_WEB)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
uint64_t temp = (uint64_t)ts.tv_sec*1000000000LLU + (uint64_t)ts.tv_nsec;
#if defined(__APPLE__)
value = mach_absolute_time();
#endif
time = (double)((double)(temp - baseTime)*1e-6);
#endif
return value;
}
return time;
// Get current time in milliseconds
static double GetCurrentTime(void)
{
return (double)(GetTimeCount() - baseTime)/frequency*1000;
}
// Returns a random number between min and max (both included)
@ -2000,6 +2019,7 @@ static inline Vector2 Vector2Add(Vector2 v1, Vector2 v2)
static inline Vector2 Vector2Subtract(Vector2 v1, Vector2 v2)
{
return (Vector2){ v1.x - v2.x, v1.y - v2.y };
}
#endif
// Creates a matrix 2x2 from a given radians value

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