SonicD007

Ah ok.  I got it.  One last question (assuming everything else looks good) Since SDL_BlitSurface takes SDL_Surface* as a parameter, I need to use mySharedPtr.get() to get a raw pointer to pass into the parameter right?

Not quite sure how to do this exactly

std::shared_ptr<SDL_Surface> foo(SDL_LoadBMP(filePath.c_str()), SDL_FreeSurface(foo));

That's what I have so far but since foo is being declared here, foo is undefined in the second parameter.  I was thinking of doing something like

SDL_Surface* temp = SDL_LoadBMP(filePath.c_str());

std::shared_ptr<SDL_Surface> foo(*temp, SDL_FreeSurface(temp));

but I'm not sure if this would be a correct use of shared_ptr nor can I compile that because it says

 
4 IntelliSense: no instance of constructor "std::tr1::shared_ptr<_Ty>::shared_ptr [with _Ty=SDL_Surface]" matches the argument list c:\users\sonicd007\documents\visual studio 2010\projects\prototypes\resource management\resourcecontroller.cpp 17

Thank you for the help.  Everything looks good now.  I know I'm missing the frame cap so I need to add that but does everything else look correct now with the updates?

 
#include <SDL.h>
#include <iostream>
 
using namespace std;
 
int main(int argc, char* argv[])
{
    if (SDL_Init(SDL_INIT_EVERYTHING) == -1)
        cout << "Error starting SDL" << endl;
 
    bool quit = false;
    const uint64_t UPDATES_PER_SECOND = 33;
    const uint64_t MILLISECONDS_PER_UPDATE = 1000/UPDATES_PER_SECOND;
    int positionX = 0;
    uint64_t currentTime = 0;
    uint64_t lastUpdate = 0;
    uint64_t nextUpdate = 0;
    int interpolationPercent = 0;
    lastUpdate = SDL_GetTicks();
    while (!quit)
    {
        currentTime = SDL_GetTicks();
        while (currentTime - nextUpdate > MILLISECONDS_PER_UPDATE)
        {
            //Do update
            positionX += 2;
            nextUpdate += MILLISECONDS_PER_UPDATE;
            
            cout << "CurrentTime: " << currentTime << endl;
            cout << "NextUpdate: " << nextUpdate << endl;
            cout << "AfterUpdate: " << positionX << endl;
            lastUpdate = currentTime;
        }
        interpolationPercent = ((currentTime - lastUpdate) * 100) / MILLISECONDS_PER_UPDATE;
        cout << "Interpolation Percent: " << interpolationPercent << endl;
        
 
    }
    SDL_Quit();
    return 0;
};

CurrentTime: 1651
NextUpdate: 1650
AfterUpdate: 110
Interpolation Percent: 0
Interpolation Percent: 6
Interpolation Percent: 10
Interpolation Percent: 13
Interpolation Percent: 16
Interpolation Percent: 20
Interpolation Percent: 20
Interpolation Percent: 23
Interpolation Percent: 26
Interpolation Percent: 30
Interpolation Percent: 33
Interpolation Percent: 36
Interpolation Percent: 40
Interpolation Percent: 43
Interpolation Percent: 46
Interpolation Percent: 46
Interpolation Percent: 50
Interpolation Percent: 53
Interpolation Percent: 56
Interpolation Percent: 60
Interpolation Percent: 63
Interpolation Percent: 66
Interpolation Percent: 70
Interpolation Percent: 73
Interpolation Percent: 76
Interpolation Percent: 80
Interpolation Percent: 83
Interpolation Percent: 86
Interpolation Percent: 90
Interpolation Percent: 93
Interpolation Percent: 96
Interpolation Percent: 96
CurrentTime: 1681
NextUpdate: 1680
AfterUpdate: 112
Interpolation Percent: 0
Interpolation Percent: 10
Interpolation Percent: 13
Interpolation Percent: 13
Interpolation Percent: 16
Interpolation Percent: 20
Interpolation Percent: 23
Interpolation Percent: 26
Interpolation Percent: 30
Interpolation Percent: 33
Interpolation Percent: 33
Interpolation Percent: 36
Interpolation Percent: 40
Interpolation Percent: 43
Interpolation Percent: 46
Interpolation Percent: 50
Interpolation Percent: 53
Interpolation Percent: 56
Interpolation Percent: 56
Interpolation Percent: 60
Interpolation Percent: 63
Interpolation Percent: 66
Interpolation Percent: 70
Interpolation Percent: 73
Interpolation Percent: 73
Interpolation Percent: 76
Interpolation Percent: 80
Interpolation Percent: 83
Interpolation Percent: 86
Interpolation Percent: 90
Interpolation Percent: 90
Interpolation Percent: 93
Interpolation Percent: 96
CurrentTime: 1711
NextUpdate: 1710
AfterUpdate: 114

Thanks.  It still doesn't look correct though.  Here is a sample output:

 
CurrentTime: 109
NextUpdate: 33
AfterUpdate: 2
CurrentTime: 109
NextUpdate: 66
AfterUpdate: 4
CurrentTime: 109
NextUpdate: 99
AfterUpdate: 6
Interpolation Percent: 330
Interpolation Percent: 36
Interpolation Percent: 6
Interpolation Percent: 3
Interpolation Percent: 6
Interpolation Percent: 3
Interpolation Percent: 6
Interpolation Percent: 3
Interpolation Percent: 6
CurrentTime: 133
NextUpdate: 132
AfterUpdate: 8
Interpolation Percent: 3
Interpolation Percent: 15
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 9
CurrentTime: 166
NextUpdate: 165
AfterUpdate: 10
Interpolation Percent: 9
Interpolation Percent: 27
Interpolation Percent: 6
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
CurrentTime: 200
NextUpdate: 198
AfterUpdate: 12
Interpolation Percent: 9
Interpolation Percent: 18
Interpolation Percent: 6
Interpolation Percent: 9
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
Interpolation Percent: 6
CurrentTime: 232
NextUpdate: 231
AfterUpdate: 14
Interpolation Percent: 9
Interpolation Percent: 33
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 12
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 12
CurrentTime: 266
NextUpdate: 264
AfterUpdate: 16
Interpolation Percent: 9
Interpolation Percent: 30
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 12
Interpolation Percent: 9
CurrentTime: 298
NextUpdate: 297
AfterUpdate: 18
Interpolation Percent: 9
Interpolation Percent: 30
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 9
Interpolation Percent: 12
Interpolation Percent: 9
Interpolation Percent: 12

EDIT: seems like there's a bug with the [/code].  Doesn't show my text after it when I post the first time.  Anyway...

Those numbers don't look right.  First off, why did interpolate percentage reach 330?  It should never reach > 100 no?  It's also increasing, then decreasing before an update even occurred.  I must be doing something wrong :/

Thank you so much everyone!  L. Spiro, thank you for clearing things up for me, that's two blogs you've made that've helped me out so far