TinyProfiler.h

#ifndef TINY_PROFILER
#define TINY_PROFILER 1

// Tiny Profiler is a lightweight tool for tracking and logging multiple tasks. I use it to 
// see which parts of my OpenGL scene graph take the longest to render.
//
// Because logging is relatively expensive, the TinyProfilerLog() function only logs every
// nth time it is called, where n is TINY_PROFILER_LOG_INTERVAL. Set this to 1 to log every time.
//
// TINY_PROFILER_COUNT is the maximum number of active profilers. There is no bounds-checking,
// so be very careful that this number is large enough.
//
// Usage: 
// 
// #include "TinyProfiler.h"
// 
// TinyProfilerStart(0); 
// 
// // task 0 goes here
// 
// TinyProfilerStop(0); 
//
// TinyProfilerStart(1); 
// 
// // task 1 goes here
// 
// TinyProfilerStop(1); 
// 
// TinyProfilerLog();

#define TINY_PROFILER_SHOULD_RUN    1

//Set these constants to match your own profiling needs

#define TINY_PROFILER_LOG_INTERVAL  300
#define TINY_PROFILER_COUNT         32
#define TINY_PROFILER_TIMER         CFAbsoluteTimeGetCurrent()
#define TINY_PROFILER_TIME_TYPE     NSTimeInterval
#define TINY_PROFILER_LOG(...)      printf("%d, %d, %f5\n", __VA_ARGS__)

typedef struct 
{
    TINY_PROFILER_TIME_TYPE startTime;
    TINY_PROFILER_TIME_TYPE totalTime;
    int                     runCount;
} 
TinyProfiler;

static TinyProfiler tinyProfilers[TINY_PROFILER_COUNT];
static int tinyProfilerLogCounter = 0;

static inline void TinyProfilerStart(int profileIndex)
{
    #ifdef TINY_PROFILER_SHOULD_RUN

    tinyProfilers[profileIndex].startTime = TINY_PROFILER_TIMER; 
    
    #endif
}

static inline void TinyProfilerStop(int profileIndex)
{
    #ifdef TINY_PROFILER_SHOULD_RUN

    tinyProfilers[profileIndex].totalTime = TINY_PROFILER_TIMER - tinyProfilers[profileIndex].startTime;
    tinyProfilers[profileIndex].runCount++;

    #endif
}

static inline void TinyProfilerLog()
{
    #ifdef TINY_PROFILER_SHOULD_RUN

    if(++tinyProfilerLogCounter != TINY_PROFILER_LOG_INTERVAL) { return; }
    
    for(int profileIndex = 0; profileIndex < TINY_PROFILER_COUNT; profileIndex++)
    {
        if(!tinyProfilers[profileIndex].runCount) { continue; }
        
        TINY_PROFILER_LOG(profileIndex, tinyProfilers[profileIndex].runCount, tinyProfilers[profileIndex].totalTime);
        
        tinyProfilers[profileIndex].startTime = 0;
        tinyProfilers[profileIndex].totalTime = 0;
        tinyProfilers[profileIndex].runCount  = 0;
    }

    tinyProfilerLogCounter = 0;
    
    #endif
}

#endif

// ----------------------------------------------------------------------------
// "THE BEER-WARE LICENSE" (Revision 42):
// Joel Bernstein wrote this file. As long as you retain this notice you
// can do whatever you want with this stuff. If we meet some day, and you think
// this stuff is worth it, you can buy me a beer in return.
// ----------------------------------------------------------------------------