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Topics - Foaly

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Graphics / Better Way to cycle through colors
« on: May 22, 2012, 12:19:21 am »
Is there a better / more efficient way to cycle through all colors than this?!

// setup
    sf::Color color;

// update loop ( fTime is the elapsed frame time)    

    fRed = color.r;
    fGreen = color.g;
    fBlue = color.b;
    if (fRed == 255 && fGreen < 255 && fBlue == 0)
        color = sf::Color(255, fGreen + 25 * fTime, 0);
    else if (fRed > 0 && fGreen == 255 && fBlue == 0)
        color = sf::Color(fRed - 25 * fTime, 255, 0);
    else if (fRed == 0 && fGreen == 255 && fBlue < 255)
        color = sf::Color(0, 255, fBlue + 25 * fTime);
    else if (fRed == 0 && fGreen > 0 && fBlue == 255)
        color = sf::Color(0, fGreen - 25 * fTime, 255);
    else if (fRed < 255 && fGreen == 0 && fBlue == 255)
        color = sf::Color(fRed + 25 * fTime, 0, 255);
    else if (fRed == 255 && fGreen == 0 && fBlue > 0)
        color = sf::Color(255, 0, fBlue - 25 * fTime);

// now use the color somehow

Feature requests / Ability to chose sound input device
« on: April 27, 2012, 11:59:32 am »
While playing around with the audio library I noticed that I couldn't change the device that inputs the audio data (i.e. microphone). My laptop has a build in mic, but I would rather use a better microphone, that I plug in the back.
I saw in https://github.com/SFML/SFML/blob/master/src/SFML/Audio/SoundRecorder.cpp#L81 that SFML always uses the default device. Could there be a function added that lets you chose the audio input device?

Foaly :)

Audio / Help Beat Detection
« on: April 27, 2012, 09:57:12 am »
Hello everybody!
As I already said in this post http://en.sfml-dev.org/forums/index.php?topic=7642.0 I wanted to make a simple Beat Detection using SFML. I used the algorithm I found here: http://www.flipcode.com/misc/BeatDetectionAlgorithms.pdf (to be precise I implemented the third version of the first algorithm, because I want to use it for techno and electronic music later anyway).
In the thread above you can see that it didn't quiet work with sf::Music, because I couldn't acces the Samples in time, so I tried using sf::SoundRecorder, because I wanted to use a direct input later anyway. I could get it to work and using a custom SoundStream I could even get it play the samples afterwards. It seems to work fairly good if I put a mic in front of a speaker. It doesn't work too too well when i plug a cable from an ipod into the mic input directly.

So now here is the thing. I am new to the whole concept of threads and mutexs and such, but I would like to use this code in a later project. I know there are a lot of very talented C++ programmers here, so would anybody mind to look at my code and tell me what they think about it and what to improve. I'm not quiet sure if i use the mutexes correctly or if the way I pass the buffers around is the most efficient one or if there is some other way of optimizing my code... Please have a look and tell me what you think.
Also does anyone have an idea why plugging in a cable into the mic input directly makes the code constantly detect a beat?

Thanks in advance,
Foaly :)

Here is my code:
#include <SFML/System.hpp>
#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
#include <iostream>
#include <vector>

sf::Mutex GlobalMutex;

class CustomRecorder : public sf::SoundRecorder
    std::vector<sf::Int16> m_Samples;
    std::size_t m_ChunckSize;

    virtual bool onStart() // optional
        // Initialize whatever has to be done before the capture starts
        m_ChunckSize = 1024;

        // Return true to start playing
        return true;

    virtual bool onProcessSamples(const sf::Int16* samples, std::size_t sampleCount)
//        std::cout << "Recording: " << sampleCount << "Samples" << std::endl;

        sf::Lock Lock(GlobalMutex);
        std::copy(samples, samples + sampleCount, std::back_inserter(m_Samples));

        // Return true to continue playing
        return true;

    virtual void onStop() // optional
        // Clean up whatever has to be done after the capture ends


    // Fill the given buffer with 1024 samples  (if possible)
    bool FillBuffer(std::vector<sf::Int16>& VectorToFill)
        if(m_Samples.size() >= m_ChunckSize)
            sf::Lock Lock(GlobalMutex);
            VectorToFill.insert(VectorToFill.begin(), m_Samples.begin(), m_Samples.begin() + m_ChunckSize + 1);
            m_Samples.erase(m_Samples.begin(), m_Samples.begin() + m_ChunckSize + 1);
            return true;
        return false;


class CustomPlayer : public sf::SoundStream

    sf::Mutex m_mutex;
    std::vector<sf::Int16> m_Samples;
    bool b_FirstTime;

    virtual bool onGetData(sf::SoundStream::Chunk& Data)
        sf::Lock Lock(m_mutex);

        // Check if there is enough data to stream
        if (m_Samples.size() < 1024)
            // Returning false means that we want to stop playing the stream
            return false;

            b_FirstTime = false;
            m_Samples.erase(m_Samples.begin(), m_Samples.begin() + 1024 + 1);

        // Fill the stream chunk with a pointer to the audio data and the number of samples to stream
        Data.samples   = &m_Samples[0];
        Data.sampleCount = 1024;

        return true;

    virtual void onSeek(sf::Time timeOffset)
         // Change the current position in the stream source


        b_FirstTime = true;
        initialize(1, 44100);

    void FillBuffer(std::vector<sf::Int16>& SourceVector)
        sf::Lock Lock(m_mutex);
        m_Samples.insert(m_Samples.end(), SourceVector.begin(), SourceVector.end() + 1);


int main()
    // Check that the device can capture audio
    if (CustomRecorder::isAvailable() == false)
        std::cout << "Sorry, audio capture is not supported by your system" << std::endl;
        return EXIT_SUCCESS;


    sf::RenderWindow window(sf::VideoMode(500, 500), "SFML works!");
    sf::RectangleShape Block;
    Block.setSize(sf::Vector2f(20, 200));
    Block.setOrigin(10, 100);
    Block.setPosition(250, 250);
    Block.setScale(1, 2);

    sf::Clock Clock;
    float FrameTime;

    CustomRecorder Recorder;
    CustomPlayer Player;

    std::vector<sf::Int16> Buffer;

    // Create the energy history buffer and set it to zero
    std::vector<float> EnergyHistoryBuffer;
    EnergyHistoryBuffer.resize(43, 0.f);


    while (window.isOpen())
        sf::Event event;
        while (window.pollEvent(event))
            // Close Event
            if (event.type == sf::Event::Closed)

            // Escape key pressed
            if ((event.type == sf::Event::KeyPressed) && (event.key.code == sf::Keyboard::Escape))


        FrameTime = Clock.getElapsedTime().asSeconds();
//        std::cout << "Framerate: " << 1.f / FrameTime << std::endl;


            // Compute instant energy
            float InstantEnergie = 0;
            for (std::vector<sf::Int16>::iterator itor = Buffer.begin(); itor < Buffer.end(); itor++)
                InstantEnergie += ((*itor) / 32767.f) * ((*itor) / 32767.f);

            // Compute average local energy
            float AverageLocalEnergySum = 0;
            for (std::vector<float>::iterator itor = EnergyHistoryBuffer.begin(); itor < EnergyHistoryBuffer.end(); itor++)
                AverageLocalEnergySum += (*itor);
            float AverageLocalEnergy = (1/43.f) * AverageLocalEnergySum;

            // Calculate the Variance of the last samples
            float VarianceSum = 0;
            for (std::vector<float>::iterator itor = EnergyHistoryBuffer.begin(); itor < EnergyHistoryBuffer.end(); itor++)
                VarianceSum += ((*itor) - AverageLocalEnergy) * ((*itor) - AverageLocalEnergy);
            float Variance = (1/43.f) * VarianceSum;

            // Calculate the Sesibility Constant
            float SensibilityConstant = (-0.0025714 * Variance) + 1.5142857;

            // Insert the Instant energy at the front of the history buffer and remove the last entry
            EnergyHistoryBuffer.insert(EnergyHistoryBuffer.begin(), InstantEnergie);

//            std::cout << "Instant Energy: " << InstantEnergie << " Local Energy: " << SensibilityConstant * AverageLocalEnergy << std::endl;
            // see if we have a beat
            if(InstantEnergie > SensibilityConstant * AverageLocalEnergy)
//                std::cout << "We have a BEAT!"  << std::endl;
                Block.setScale(1, 2);//(rand()) / RAND_MAX * (0.4) + 1.8 );



//        Block.rotate(50 * FrameTime);
        if(Block.getScale().y > 0.8)
            Block.setScale(1, Block.getScale().y - 0.9 * FrameTime);



    return 0;

edit: maybe a little suggestion for the forum: what about a "spoiler" function or something like that? So that you only see the code when you click on it :)

Graphics / iTunes Effects
« on: April 24, 2012, 09:36:13 pm »
Hi everybody.
I have a question. The other day I looked at the iTunes Effects, which you can play while music plays (by pressing CTRL + T). They look really cool, but I wondered how they work. I couldn't figure any pattern or anything like that out. Does anybody have an idea how something like that is realized/done?
Thanks in advance,

Audio / Accessing Musics Samples
« on: April 19, 2012, 06:05:51 pm »
Hello everybody,
my questions is if it is possible to access the samples of a music file in real time. I'm not sure if it's clear what I mean, so I'll explain what I want to do. I would like to get the samples of a music file currently being processed, so I can do some sound manipulation in real time (while it's being played). I know this is possible with SoundBuffers, but I want to use bigger files (i.e. SoundStreams / sf::Music). Is there any way I can do this with SFML? And if not is there any way I can do this using as much of SFML convenience as possible?
Thanks in advance :)

I am on a Windows machine using the current SFML2 rc btw.

Audio / Sine Wave
« on: February 24, 2012, 08:06:29 am »
Hi everybody,
I have a little problem. I am trying to write a little program that creates simple Sounds like a Sine wave or a Square wave. As for now everything is going quiet well. The only thing is that the output is not as I expected. It sounds right, but when I went to a program like Audacity and compared my output to their Sinewave (same with the Squarewave respectively) I noticed that my sound is one wavelength to short. I am not quiet sure why. I think it might be a rounding error... Can somebody please tell me whats wrong.
Thanks in advance,

Code: [Select]
#include <SFML/System.hpp>
#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
#include <iostream>
#include <vector>
#include <math.h>

#define sin_d(x) (sin((x)*M_PI/180))

int main()
    int SampleRate = 44100; // 44100 = CD-Quality
    int Frequency = 440; // 440 = A
    float Duration = 1; // in Seconds
    int LengthInSamples = SampleRate * Duration;

    sf::Int16 Samples[LengthInSamples];

    float dist = SampleRate / Frequency;
    int dist2 = dist / 2;
    int count = LengthInSamples / dist +1;

    for(int a = 0; a < count; a++)
        for(int b = 0; b < dist; b++)
            if(a * dist + b >= LengthInSamples)

//            //Sine Wave
//            Samples[a*int(dist)+b] = sin_d(b / dist * 360.f) * 32767;

//            // Square Wave
//            if(b < dist2)
//            {
//                Samples[a*int(dist) + b] = 32767;
//            }
//            else
//            {
//                Samples[a*int(dist) + b] = -32767;
//            }

    sf::SoundBuffer FinalBuffer;
    FinalBuffer.LoadFromSamples(Samples, LengthInSamples, 1, SampleRate);

    return 0;

Audio / Combining Soundbuffers
« on: February 06, 2012, 11:00:14 am »
Hello everybody!

I have a little problem and I am not quiet sure how to solve it. Hopefully someone can point me the right direction.
So i would like to "combine" two soundbuffers. Meaning i have two different soundbuffers and i want to combine them into one. My idea was that I use GetSamples() to get the samples of each buffer and then add them together into one array and then call the LoadFromMemory() member of a third buffer to finish up. So the real question is how do I add the two array together? Or is there a better method to solve the whole problem?
I hope someone can help me. Thanks in advance.

Graphics / SIGTRAP after SetText()
« on: June 29, 2011, 08:32:03 pm »
Hello there,
I have a little problem here and I hope that somebody can help me. I have been working on a game for quiet some time now and everything seemed to work fine. I'm not home for a couple of weeks now, but I wanted to continue working on my game. So i brought all the files with me and set everything up on a different computer. The program compiles just fine. But when i tried to fire up the debugger a weird thing happened. The program just crashed out of nowhere at start up. All the debugger was saying was:
Code: [Select]
Program received signal SIGTRAP, Trace/breakpoint trap.
In ?? () ()
Debugger finished with status 0

Of course that is useless as could be. The call stack did show anything interesting either. So I tried different things, but none of them seemed to work at all. Then i had the idea to update my IDE (i am using Code::Blocks 10.05). So i downloaded the debugger nighly (26 June 2011 build (rev 7257)). I still got the same error, but this time the debugger messages were a little more detailed. This time the call stack looked like this:
Code: [Select]
#0 7C90120F ntdll!DbgUiConnectToDbg() (C:\WINDOWS\system32\ntdll.dll:??)
#1 7C96EE31 ntdll!RtlpNtMakeTemporaryKey() (C:\WINDOWS\system32\ntdll.dll:??)
#2 7C96F26E ntdll!RtlpNtMakeTemporaryKey() (C:\WINDOWS\system32\ntdll.dll:??)
#3 7C970456 ntdll!RtlpNtMakeTemporaryKey() (C:\WINDOWS\system32\ntdll.dll:??)
#4 7C94BAFC ntdll!LdrFindEntryForAddress() (C:\WINDOWS\system32\ntdll.dll:??)
#5 015E0000 ?? () (??:??)
#6 7C91A1BA ntdll!RtlpUnWaitCriticalSection() (C:\WINDOWS\system32\ntdll.dll:??)
#7 77C2C2DE msvcrt!free() (C:\WINDOWS\system32\msvcrt.dll:??)
#8 015E0000 ?? () (??:??)
#9 00A25CCD __gnu_cxx::new_allocator<char>::deallocate(this=0x22fd2b, __p=0x679e9c34 "") (d:/programmes/mingw-4.4/bin/../lib/gcc/mingw32/4.4.0/include/c++/ext/new_allocator.h:95)
#10 00A4771D std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::_Rep::_M_destroy(this=0x679e9c34, __a=...) (d:/programmes/mingw-4.4/bin/../lib/gcc/mingw32/4.4.0/include/c++/bits/basic_string.tcc:427)
#11 00A4777E std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::_Rep::_M_dispose(this=0x679e9c34, __a=...) (d:/programmes/mingw-4.4/bin/../lib/gcc/mingw32/4.4.0/include/c++/bits/basic_string.h:231)
#12 00A47B00 std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::assign(this=0x15e8ba0, __str=...) (d:/programmes/mingw-4.4/bin/../lib/gcc/mingw32/4.4.0/include/c++/bits/basic_string.tcc:251)
#13 00A47EEC std::basic_string<unsigned int, std::char_traits<unsigned int>, std::allocator<unsigned int> >::operator=(this=0x15e8ba0, __str=...) (d:/programmes/mingw-4.4/bin/../lib/gcc/mingw32/4.4.0/include/c++/bits/basic_string.h:506)
#14 00A250CC sf::Unicode::Text::operator=(this=0x15e8ba0) (../../include/SFML/System/Unicode.hpp:64)
#15 00983958 sf::String::SetText(this=0x15e8af4, Text=...) (D:\dev\sfml\sdk\SFML-1.6\src\SFML\Graphics\String.cpp:68)
#16 00409629 CMainMenu::Init(this=0x15e8880) (..\Src\MainMenu.cpp:9)

The part of the code that the error is referring too looks like this:
Code: [Select]
In the header file:
sf::String creditsHeader;

and in the .cpp file:

So I am really lost on this one and I don't know anything more that I could try... I hope somebody can help me.

Here are some more information on the system and versions:
Windows XP SP3
SFML 1.6
gcc 4.5.2

General discussions / OpenGL linking errors
« on: August 17, 2010, 11:31:29 am »
Hey guys,
i am new to SFML and so far i found it awesome! But now i got a little problem. I'm trying to make a little game and it all worked pretty well. Then i tried to add some animations. So i used these animation classes of the wiki. After adding the pausableclock.hpp it compiled, but then i got a bunch of linking errors such as:  undefined reference to glbegin@4. They all point to some OpenGl functions. So my question is can anybody tell me how to link that? According to the tutorial a simple adding of the window library should do it. Some how it doesnt work so. i linked my libraries like that:

So can somebody please help me?

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