Messages

1

Graphics / Mixing shaders

« on: January 05, 2011, 03:57:30 pm »

If nothing can be done, I can actually put all the effects in one shader file, but I guess it should be possible to re-draw objects to RenderImages several times but with different shaders.

Here is the minimal code (I hope):

Code: [Select]


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

std::string pixelate = "uniform sampler2D texture;\
uniform vec2 mouse;\
\
void main()\
{\
float factor = 5 + 100 * length(mouse);\
vec2 pos = floor(gl_TexCoord[0].xy * factor + 0.5) / factor;\
\
gl_FragColor = texture2D(texture, pos) * gl_Color; \
}\
";

std::string colorize = "\
uniform sampler2D texture;\
uniform vec3 color;\
\
void main()\
{\
vec4 pixel = texture2D(texture, gl_TexCoord[0].xy) * gl_Color;\
float gray = pixel.r * 0.39 + pixel.g * 0.50 + pixel.b * 0.11;\
\
gl_FragColor = vec4(gray * color, 1.0) * 0.6 + pixel * 0.4;\
gl_FragColor.a = pixel.a;\
}\
";

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

// Load a background image to display
    sf::Shape Circle = sf::Shape::Circle(400, 300, 100, sf::Color::White);

    sf::Shader shaders[2];
    shaders[0].LoadFromMemory(pixelate.c_str());
    shaders[1].LoadFromMemory(colorize.c_str());

    shaders[0].SetTexture("texture", sf::Shader::CurrentTexture);
    shaders[1].SetTexture("texture", sf::Shader::CurrentTexture);
    shaders[1].SetParameter("color", 1.f, 1.f, 1.f);

    sf::RenderImage rim, buffer;
    rim.Create(800, 600);
    buffer.Create(800, 600);

    sf::RenderImage *front = &rim;
    sf::RenderImage *back = &buffer;

    // Start the game loop
    while (window.IsOpened())
    {
        // Process events
        sf::Event event;
        while (window.GetEvent(event))
        {
            // Close window : exit
            if (event.Type == sf::Event::Closed)
                window.Close();
        }

        shaders[1].SetParameter("color", (1.0f / window.GetInput().GetMouseX()) * 800.0f, 1.0f, 1.0f);
shaders[0].SetParameter("mouse", (float)window.GetInput().GetMouseX() / static_cast<float>(window.GetWidth()), (float)window.GetInput().GetMouseY() / static_cast<float>(window.GetHeight()));

        window.Clear();

back->Clear();
        back->Draw(Circle);
        back->Display();

for ( int i = 0; i < 2; i++)
{
front->Clear();
front->Draw(sf::Sprite(back->GetImage()), shaders[i]);
front->Display();

std::swap(front, back);
}

sf::Sprite test(back->GetImage());

        window.Draw(test);

        // Finally, display the rendered frame on screen
        window.Display();
    }
}



The last shader's parameter is not updated (?) Actually this looks like a different problem.

2

Graphics / Mixing shaders

« on: January 05, 2011, 01:05:09 pm »

Hello,

I have come upon a problem with applying several shaders to an image.
What I'm currently doing is I'm drawing all the necessary stuff to a RenderImage, and then I keep copying it to image, and drawing again with a different shader.

The main loop code:

Code: [Select]


window.Clear();

rim.Clear();
rim.Draw(background);
rim.Display();

RenderToImage(rim);
sf::Sprite test(rim.GetImage());
window.Draw(test);


RenderToImage function:

Code: [Select]


void CEffectManager::RenderToImage(sf::RenderImage &_renderimage)
{
std::list<CBaseEffect*>::iterator it = m_Effects.begin();

for ( ; it != m_Effects.end(); it++)
{
m_CopyImage = _renderimage.GetImage();

_renderimage.Clear();
_renderimage.Draw(sf::Sprite(m_CopyImage), *(*it));

_renderimage.Display();
}
}


The problem is only one shader will apply. Each of the shaders work.
I tried searching the forums but couldn't find any solution (or maybe I searched too little?). What might be wrong?

Thanks in advance

3

Graphics / Program crashes when LMB is pressed

« on: October 09, 2010, 03:04:35 pm »

I guess the problem is here:

Code: [Select]

CBullet bullet(SPRPlayer.GetPosition().x, SPRPlayer.GetPosition().y, SPRPlayer.GetRotation());
         CLKShoot.Reset();
      }

The bullet is being pushed back to your list/vector, but it's destroyed - goes out of scope.

Try doing something like

Code: [Select]

CBullet *bullet = new CBullet(SPRPlayer.GetPosition().x, SPRPlayer.GetPosition().y, SPRPlayer.GetRotation());

don't forget about deleting it somewhere later.

4

Graphics / [solved] sf::Shape::Line SetPointPosition problem

« on: November 22, 2009, 02:46:11 pm »

Thanks for claryfying:) The problem is now solved.

5

Graphics / [solved] sf::Shape::Line SetPointPosition problem

« on: November 22, 2009, 01:38:37 pm »

Hello!:) I am quite new to SFML, I've been working with it for a few weeks already, and I must say it is a great library, thank you Laurent.

However, I couldn't find a solution to this problem:

Code: [Select]

sf::Shape Line = sf::Shape::Line(100, 100, 100, 200, 1, sf::Color::White);
Line.SetPointPosition(0, sf::Vector2f(100, 100));
Line.SetPointPosition(1, sf::Vector2f(100, 400));


Setting the points of a line doesn't work as supposed, or maybe I'm just doing it wrong?