Messages

1

Audio / Re: Getting a sample buffer in sync with music's own.

« on: March 31, 2014, 11:46:34 pm »

In the previous thread I linked there was a delay between the samples being analysed (roughly 2 seconds for a 44.1kHz sound) and the ones actually being played through the speakers. You suggested lowering the buffer size in sf::Music although pointed out there would still be a delay, only smaller and that the music might not play smoothly.

I thought I could just use a simple queue to store the 3 buffers and use the "oldest" one for FFT analysis. When new samples were loaded I would push them into the queue and just pop the "oldest" one. It doesn't work and is still roughly 2 seconds infront.

I would've thought this would solve the delay caused by the triple buffering in sf::Music, but it doesn't and I can't figure out why....I probably dun goofed somewhere.

2

Audio / Getting a sample buffer in sync with music's own.

« on: March 31, 2014, 10:55:25 pm »

I'm trying to visualize an FFT using the sf::Music class. However my visualization happens 2 or so seconds before what gets played which is what I expected.

I'ts pretty easy to do this just by using an sf::SoundBuffer on it's own but then there is a 3-4 second delay loading the file and easily 100mb+ memory usage.

Having read this thread I can't understand why I cannot simply do this:

class FFT: public sf::Music
{
public:

        app()
        {
                loadFromFile("music.ogg");
                play();
        }

        void input()
        {
                standard event stuff...
        }

        virtual bool onGetData(sf::SoundStream::Chunk& data)
        {
                bool result = sf::Music::onGetData(data);

                chunkQ.push(data);

                if (chunkQ.size() > bufferCount)
                {
                        chunkQ.pop();
                }

                chunkData = chunkQ.front();

                return result;
        }

        void render()
        {
                rendering vertex array....
        }
       
        void update()
        {
                crazy FFT shit going on here....
        }

        void run()
        {
                typical run loop....
        }

private:

        sf::SoundStream::Chunk chunkData;
        std::queue<sf::SoundStream::Chunk> chunkQ;

        window, vertex array, other stuff not important
};
 

3

Graphics / Re: Tilemap rendering issues

« on: March 08, 2014, 05:34:23 am »

It does seem strange although I found this "hack" in several forums and the general reasoning behind it was AMD/nVidia round floating point numbers differently.

I'm using whatever was the latest revision on github about a month ago, so as far as I can see from the commits nothing has been changed that would affect this.

4

Graphics / Re: Tilemap rendering issues

« on: March 07, 2014, 02:51:04 am »

After hours of googling and several dodgy hacks later I came upon one method that works 100% on all of my different set-ups!

float x = view.getCenter().x;
float y = view.getCenter().y;

x = std::floor(x);
y = std::floor(y);
x += 0.375f;
y += 0.375f;

view.setCenter(x, y);

I was already rounding the views co-ords to integers, but adding 0.375f draws the tiles pixel-perfect every time!

5

Graphics / Re: Tilemap rendering issues

« on: February 25, 2014, 11:41:13 pm »

Each tile in my tileset texture is 48x48 and the same on screen, so the 1:1 mapping shouldn't be the problem.

The tilemap is never moved, only the view is moved and each tile on startup is given and integer position and size (although casted to a float to work with sf::Vertex)

The code below is what I'm using to draw the tilemap.

void draw()
{
        sf::View view = window->getView();
        float cx = view.getCenter().x;
        float cy = view.getCenter().y;
        float x = cx - window->getSize().x / 2;
        float y = cy - window->getSize().y / 2;
        cx = std::floor(cx);
        cy = std::floor(cy);

        view.setCenter(cx, cy);
        rTexture.setView(view);

        rTexture.clear(sf::Color::Transparent);
        rTexture.draw(*map);
        rTexture.display();

        const sf::Texture& texture = rTexture.getTexture();

        // draw it to the window
        sf::Sprite sprite(texture);
        sprite.setPosition(x ,y);

        window->draw(sprite);
}
 

6

Graphics / Tilemap rendering issues

« on: February 25, 2014, 11:04:53 pm »

Can anyone explain why I get these rendering quirks on different GPU's?

AMD HD5850: Looks perfect no artifacts


nVidia Gefore GT 740M: Some tiles shift upwards/downards by 1 pixel but leave no gaps


Intel 4400:  Only horizontal gaps and weird shifting inside the tiles