Messages

1

Graphics / drawing Sprite from RenderTexture

« on: January 06, 2012, 09:19:53 pm »

oh ... thx for the answer. I thought that there is a bug or I am doing somethong wrong

2

Graphics / drawing Sprite from RenderTexture

« on: January 06, 2012, 07:18:09 pm »

I have strange behaviour while drawing sprite made from RenderTexture. I just create a RenderTexture with red background, draw a blue rectangle in the center and then I draw it on the RenderWindow.
Window is red, like a sprite is being drawn but blue rectangle is missing.
When I check the sprite saving it to a file, the blue rectangle is there.
I don't understand why is this happening that only red color of background is being drawn on the window.
btw I have onboard intel graphic card.

Code: [Select]


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

sf::RenderTexture texture;
texture.Create(800,600);
texture.Clear(sf::Color::Red);

sf::RectangleShape shape(sf::Vector2f(50,50));
shape.SetFillColor(sf::Color::Blue);
shape.SetOrigin(25,25);
shape.SetPosition(400,300);

texture.Draw(shape);
texture.Display();

    while (window.IsOpened())
    {
        sf::Event event;
        while (window.PollEvent(event))
            if (event.Type == sf::Event::Closed)
                window.Close();
 
        window.Clear();
 
sf::Sprite s(texture.GetTexture());

//s.GetTexture()->CopyToImage().SaveToFile("file.png");

        window.Draw(s);
 
        window.Display();
    }
 
    return 0;
}


3

Graphics / Question about shader sfml2

« on: July 11, 2011, 12:29:00 pm »

Thank you for reply. With those modifications it works:

Code: [Select]


...
    if (sf::Shader::IsAvailable())
    {
        shader.LoadFromFile("default.frag");
        std::string texName("tex");
        shader.SetTexture(texName, image);
        shader.SetCurrentTexture(texName);
    }
...

shader:

Code: [Select]


uniform sampler2D tex;

void main(void)
{
    vec4 curColor = texture2D(tex, gl_TexCoord[0].xy);
    vec4 shadow = vec4(0.5, 0.5, 0.5, 1.0);

    if (curColor.r == 0.0f && curColor.g == 0.0f && curColor.b == 1.0f)
        gl_FragColor = shadow;
    else
        gl_FragColor = curColor;
}


4

Window / RenderTarget::Clear segmentation fault

« on: July 01, 2011, 12:06:24 pm »

You are right. My mistake. :oops: I have changed libraries but did not updated include files.  It's working now.

5

Window / RenderTarget::Clear segmentation fault

« on: June 30, 2011, 08:45:45 am »

Hello,
I am using sfml2 for some time. Yesterday I have decided to build new libraries from snapshot with number f9435eb. I have used cmake to generate codeblocks project and build static libraries (codeblocks mingw). After rebuild of my project with new libraries application crashes with segmentation fault in RenderTarget::Clear when trying to call pure virtual method Activate() on line 59. I have tried tutorial project and it crashes also. sf::RenderWindow is instantiated on stack, but when it goes into Clear it crashes.  
Looks like my libraries are not build correctly, but I don't know why. I have build previous libraries same way and they work.
Does anyone know where can be the problem?

6

Graphics / Question about shader sfml2

« on: June 26, 2011, 12:31:21 pm »

Hello,
I have question about using fragment shader in sfml 2. I am trying to apply shader to whole screen and replace one particular color with different one.
This is my code:

Code: [Select]


#include <SFML/Audio.hpp>
#include <SFML/Graphics.hpp>

int main()
{
    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML window");
    sf::Shape shape = sf::Shape::Rectangle(400,300,100,100,sf::Color(0,0,255));
    sf::Shader shader;
    sf::Image image;

    if (sf::Shader::IsAvailable())
        shader.LoadFromFile("shader.frag");

    while (window.IsOpened())
    {
        sf::Event event;
        while (window.PollEvent(event))
        {
            if (event.Type == sf::Event::Closed)
                window.Close();
        }
        window.Clear(sf::Color(0,0,0));
        window.Draw(shape);
        if (sf::Shader::IsAvailable())
        {
            image.CopyScreen(window);
            window.Draw(sf::Sprite(image), shader);
        }
        window.Display();
    }
    return EXIT_SUCCESS;
}

Here is my fragment shader:

Code: [Select]


void main(void)
{
    vec4 shadow = vec4(0.5, 0.5, 0.5, 0.5);

    if (gl_Color.r == 0.0f && gl_Color.g == 0.0f && gl_Color.b == 1.0f)
        gl_FragColor = shadow;
    else
        gl_FragColor = gl_Color;
}

When I do not apply shader, screen is black with blue square, but when I paint screen with shader, all pixels are white. There are no error messages on console so looks like shader is compiled succesfully. For some reason rgb values of gl_Color is set to 1. Can someone please tell me what am I doing wrong?