Messages

1

Graphics / Settings texture wrapping to repeat using sf::Renderer

« on: June 08, 2011, 08:16:21 pm »

Ah, I didn't know that, but it works perfectly now   .

2

Graphics / Settings texture wrapping to repeat using sf::Renderer

« on: June 08, 2011, 07:16:08 pm »

I was just trying out some ways to generate a racing track from a few points, generating the vertices worked out right but I'm having some problems with the texture coordinates. I currently have a distance variable which keeps track of the current track distance and a textureSize variable which determines how much pixels of the track the texture should cover.

The code which calculates the uv coordinates:

Code: [Select]


float textureSize = 64.0f //The texture is 64x64 so this should display it at the real scale.

// The two sides of the point in the track.
leftVertex.texCoords = sf::Vector2f(0.0f, distance / textureSize);
rightVertex.texCoords = sf::Vector2f(1.0f, distance / textureSize);


I render the vertices like this:

Code: [Select]


renderer.SaveGLStates();
   
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_WRAP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_WRAP);
   
renderer.SetTexture(&m_Texture);
renderer.Begin(sf::Renderer::TriangleStrip);
    for (int i = 0; i < m_sideVertices.size(); i++)
    {
        renderer.AddVertex(m_sideVertices[i].position.x,
                           m_sideVertices[i].position.y,
                           m_sideVertices[i].texCoords.x,
                           m_sideVertices[i].texCoords.y,
                           sf::Color::White);
    }
renderer.End();

renderer.RestoreGLStates();


But it looks like this (red lines show where the vertices are):


As you can see the beginning of the track (the left side) is textured correctly because the v coordinates are within the 0-1 range, after that the texture gets stretched out.

So is setting the texture wrapping mode to GL_REPEAT not working or am I using the wrong texture coordinates?

3

General / Get positional data from View in SFML 2.0

« on: May 07, 2011, 10:08:47 am »

I had some problems with the GetCenter() function because the View logic changed in SFML 2.0, I corrected it and everything works fine again.

4

General / Get positional data from View in SFML 2.0

« on: May 06, 2011, 09:20:00 pm »

I just changed to SFML 2.0 and all went well until I couldn't find a way to retrieve data about the position of the current sf::View. I have a tile map and I only want to draw the tiles that are currently visible. The only way I thought of was to retrieve the data from the projection matrix but it seems kind of hacky :?.

5

General / Window only updates when mouse is moved over it.

« on: April 23, 2011, 10:12:16 pm »

Never mind... I made a stupid mistake, I quickly wrote the event loop and never looked at it again, but I accidentally included the updating and rendering inside it. I feel stupid  :x.

6

General / Window only updates when mouse is moved over it.

« on: April 23, 2011, 09:52:40 pm »

I succeeded in disabling compositing and the problem still remains  .

7

Graphics / Zoom to mouse (as in Google maps)?

« on: April 16, 2011, 01:00:21 pm »

I worked on a little demo so you can try to understand what is going on, change a few of the values and see what happens.

I hope this is the effect you wanted .

Code: [Select]


#include <SFML/Graphics.hpp>
#include <iostream>
#include <math.h>

float lerp(float value, float start, float end)
{
    return start + (end - start) * value;
}

int main()
{
    sf::RenderWindow App(sf::VideoMode(800, 600), "SFML window");

    const sf::Input& input = App.GetInput();

    // Make a few shapes for testing.
    sf::Shape rect1 = sf::Shape::Rectangle(10, 10, 60, 60, sf::Color(255, 0, 0));
    sf::Shape circle1 = sf::Shape::Circle(100, 100, 40, sf::Color(0, 255, 0));
    sf::Shape line1 = sf::Shape::Line(200, 200, 300, 300, 2, sf::Color(0, 0, 255));

    sf::Vector2f currentCenter;
    sf::Vector2f targetCenter;
    float targetZoom = 0.0f;
    float currentZoom = 0.0f;
    float previousZoom = 0.0f;
    bool zooming = false;

    float lerpFactor = 0.01f; // The speed of the zooming.

    while (App.IsOpened())
    {
        sf::Event Event;
        while (App.GetEvent(Event))
        {
            if (Event.Type == sf::Event::Closed)
                App.Close();
            else if(Event.Type == sf::Event::MouseWheelMoved)
            {
                zooming = true;

                // Zooming in or out.
                if (Event.MouseWheel.Delta == 1)
                    targetZoom = 1.3f;
                else
                    targetZoom = 0.7f;

                currentZoom = 1.0f;
                previousZoom = currentZoom;

                // Store the current center of the view and our target (the position of the mouse).
                currentCenter = App.GetDefaultView().GetCenter();
                targetCenter = App.ConvertCoords(input.GetMouseX(), input.GetMouseY(), &App.GetDefaultView());
            }
        }

        if (zooming)
        {
            // Interpolate between the current zoom and the target zoom for a smooth effect.
            currentZoom = lerp(lerpFactor, currentZoom, targetZoom);
            App.GetDefaultView().Zoom(1.0f + (currentZoom - previousZoom));

            // Interpolate the between the current center of the view and the target.
            currentCenter.x = lerp(lerpFactor, currentCenter.x, targetCenter.x);
            currentCenter.y = lerp(lerpFactor, currentCenter.y, targetCenter.y);
            App.GetDefaultView().SetCenter(currentCenter);

            // Store the previous zoom because we will need the difference between the previous and current zoom.
            // This is because sf::View::Zoom zooms relative to the current zoom.
            previousZoom = currentZoom;

            // If the difference between the current and previous zoom is less then 0.01, stop zooming.
            // Linear interpolation will never reach the target value so we stop here.
            if (fabs(targetZoom - currentZoom) < 0.01f)
                zooming = false;
        }

        App.Clear();

        App.Draw(rect1);
        App.Draw(circle1);
        App.Draw(line1);

        App.Display();
    }

    return 0;
}



8

Graphics / Zoom to mouse (as in Google maps)?

« on: April 16, 2011, 12:04:09 pm »

Is this all of the code in which you implemented the zooming? Because your missing quite a lot.

9

General / Window only updates when mouse is moved over it.

« on: April 16, 2011, 11:43:00 am »

I think I'm using metacity with compositing enabled, but I'm not too sure as I've just started using Ubuntu.

10

Graphics / Zoom to mouse (as in Google maps)?

« on: April 16, 2011, 11:19:29 am »

You could define a linear interpolation function like this:

Code: [Select]


float lerp(float value, float start, float end)
{
    return start + (end - start) * value;
}


Then set the center of the View with sf::View::SetCenter(mouseX, mouseY) and zoom into that position with the result of the lerp with sf::View::Zoom().

Some pseudo code:

Code: [Select]


targetzoom = 0
currentzoom = 0
previouszoom = 0
zooming = false

void update()
{
    if (move mousewheel)
    {
        zooming = true

        targetzoom = 0.5
        currentzoom = 0
    }

    if (zooming)
    {
        currentzoom = lerp(0.01, currentzoom, targetzoom)

        view.Zoom(currentzoom - previouszoom) // Zoom is relative.

        previouszoom = currentzoom

        if (abs(targetzoom - currentzoom) < 0.1) // Lerp will never reach the target.
            zooming = false
    }
}



11

General / Window only updates when mouse is moved over it.

« on: April 16, 2011, 10:52:28 am »

I just switched to Ubuntu and tried using SFML, however my RenderWindow only updates when I move the mouse cursor over it.

I use the code from the tutorial about Sprites and move the sprite by a tiny amount each frame. If I move the mouse for a few seconds the window keeps updating after I stop moving it, but after a few seconds the window stops updating.

Code: [Select]


#include <SFML/Graphics.hpp>
 
 int main()
 {
     sf::RenderWindow App(sf::VideoMode(800, 600), "SFML window");

     sf::Image Image;
     Image.LoadFromFile("data/circle.png");
     sf::Sprite Sprite(Image);

     while (App.IsOpened())
     {
         sf::Event event;
         while (App.GetEvent(event))
         {
             if (event.Type == sf::Event::Closed)
                 App.Close();
         }

         sprite.Move(20 * App.GetFrameTime(), 0);
 
         // Clear screen
         App.Clear();
 
         App.Draw(sprite);
 
         // Update the window
         App.Display();
     }
 
     return 0;
 }


12

General / Game won't start anymore

« on: December 15, 2010, 06:07:52 pm »

Ok I changed the libs to the static ones and it works now.
But now there are a few graphics artefacts that weren't there before (the areas where images were drawn the frame before are white), could this be the new drivers?

13

General / Game won't start anymore

« on: December 15, 2010, 11:47:06 am »

Yes i also changed my drivers! Can you also downgrade them?

14

General / Game won't start anymore

« on: December 15, 2010, 07:19:27 am »

It doesn't even reach the "int main()" when I put a breakpoint there, in other projects without SFML it does  :x. Any game which uses SFML now stopped working, and it doesn't give any errors .

15

General / Game won't start anymore

« on: December 14, 2010, 08:20:26 pm »

Hello, I've a bit of a problem here, I continued working on my game and all of a sudden it won't start any more  :shock:. When I click the .exe it does nothing for about 5 seconds and then a console window pops up which doesn't close directly when you try to. It works on the computer of a friend of mine so it's not in the code.

I know it's not a lot of information but is there anything I might have changed in my computer that can cause this?