Topics

1

Graphics / RenderTexture question

« on: October 23, 2012, 12:23:40 am »

Hello, I have a render texture and now I found that it's turned with 2Pi radians. Now when I want to convert some coords with renderTarget()->convertCoords(x, y) I get them but refer to bottom&right, not left&top.

When I call renderTarget.display() the texture becomes "normal". That's a feature?

2

Graphics / sf::View and render target

« on: October 20, 2012, 01:23:02 am »

Hello, I have a few questions about how views are working.

    sf::RenderWindow *mApp;
    sf::View *mCamera;
    sf::RenderTexture *mRenderTarget;

So first, everything is rendered into mRenderTarget and at the end of the game cycle I draw final image to mApp.

Here is the function which initializes camera and reinitializes it when window is resized:

void DisplayManager::InitializeCamera(const sf::FloatRect &rect)
{
    // This is automatically called when window is resized
    mCamera->reset(rect);
    mApp->setView(*mCamera);

    mRenderTarget->create(rect.width, rect.height);
    mRenderTarget->setView(*mCamera);
}
 

And it looks like:

    mRenderTarget->display();
    mApp->draw(sf::Sprite(mRenderTarget->getTexture()));
    mApp->display();

The questions:
Is that code right?
How does views work? When I change some parameters of it I have to reinitialize render target and/or window with same view:

         mCamera->zoom(0.96);
        //mApp>setView(*mCamera);  // Required?
        mRenerTarget->setView(*mCamera);

Should I set view to render target only (everything is drawn onto it first)? And why should I setView again and again after any change to the view object? If sf::Window (abstract) takes in arguments address of the view why doesn't it track the changes inside the object?

And the last: when I want to use sf::Window::convertCoords, should I call it from renderTarget (sf::RenderTextuer) or mApp (sf::RenderWindow)?

Thanks

3

Graphics / Polygon to shader

« on: October 16, 2012, 04:03:15 pm »

Hello, I'm rendering everything to RenderTexture: image and polygon. It looks like 1.png from attachment. The code is:

    sf::Texture img;
    img.loadFromFile("test.png");
    RENDER_TEXTURE->draw(sf::Sprite(img));

    sf::ConvexShape polygon;
    polygon.setPointCount(3);
    polygon.setPoint(0, sf::Vector2f(0, 0));
    polygon.setPoint(1, sf::Vector2f(230, 10));
    polygon.setPoint(2, sf::Vector2f(70, 200));
    polygon.setOutlineColor(sf::Color::Red);
    polygon.setFillColor(sf::Color::Transparent);
    polygon.setOutlineThickness(5);

    RENDER_TEXTURE->draw(polygon);

Now I want to apply some shader for the area inside that polygon. I wrote a simple one:

uniform sampler2D texture;

void main()
{
    vec4 color = texture2D(texture, gl_TexCoord[0].xy);
    if (color.a != 0.)
    {
        color.r += 0.4;
    }

    gl_FragColor = color;
}

And changed the code of polygon drawing to:

shader.setParameter("texture", sf::Shader::CurrentTexture);
RENDER_TEXTURE->draw(polygon, shader);

The result you could see at second attachment. So, the shader is applied only for polygon, not for the whole texture inside it. But what to do if I want to pass that area inside polygon into shader and make it more red?

[attachment deleted by admin]

4

General / Coordinates system

« on: August 07, 2012, 05:57:44 pm »

Hello, I'm using box2d with sfml and they have different coord system. In SFML Y is directed updown, and in Box2D downup. Any ways to change SFML's  one to box2d's?

5

General / Spark2 in sfml

« on: March 10, 2012, 12:39:34 pm »

Hello, I've decided to use Spark2 OpenGL renderer with sfml2.

The initialization code:

Code: [Select]

   mSystem = SPK::System::create(true);
    mSystem->setName("Particles");

    SPK::System::setClampStep(true, 0.1f);
    SPK::System::useAdaptiveStep(0.001f, 0.01f);

    // Load particle texture
    GLuint texture = 0;
    {
        sf::Image image;
        if (!image.LoadFromFile("Media/explosion.bmp"))
            ERR("FAILED TO LOAD TEXTURE");

        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_2D, texture);
        gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA, image.GetWidth(), image.GetHeight(), GL_RGBA, GL_UNSIGNED_BYTE, image.GetPixelsPtr());
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    }

    // Create quad renderer
    mRenderer = SPK::GL::GLQuadRenderer::create();
    mRenderer->setBlendMode(SPK::BLEND_MODE_ADD);
    mRenderer->enableRenderingOption(SPK::RENDERING_OPTION_DEPTH_WRITE, false);
    mRenderer->setTexture(texture);
    mRenderer->setTexturingMode(SPK::TEXTURE_MODE_2D);
    mRenderer->setAtlasDimensions(2, 2);


And some fun with emitters:

Code: [Select]

   SPK::Ref<SPK::SphericEmitter> emitter = SPK::SphericEmitter::create(SPK::Vector3D(0.0f,0.0f,-1.0f),0.0f,3.14159f / 4.0f,SPK::Point::create(),true,-1,100.0f,0.2f,0.5f);

    SPK::Ref<SPK::Group> phantomGroup = mSystem->createGroup(40);
    SPK::Ref<SPK::Group> trailGroup = mSystem->createGroup(1000);

    SPK::Ref<SPK::Plane> ground = SPK::Plane::create(SPK::Vector3D(0.0f,-1.0f,0.0f));

    phantomGroup->setName("Phantom Group");
    phantomGroup->setLifeTime(5.0f,5.0f);
    phantomGroup->setRadius(0.06f);
    phantomGroup->addEmitter(SPK::SphericEmitter::create(SPK::Vector3D(0.0f,1.0f,0.0f),0.0f,3.14159f / 4.0f,SPK::Point::create(SPK::Vector3D(0.0f,-1.0f,0.0f)),true,-1,2.0f,1.2f,2.0f));
    phantomGroup->addModifier(SPK::Gravity::create(SPK::Vector3D(0.0f,-1.0f,0.0f)));
    phantomGroup->addModifier(SPK::Obstacle::create(ground,0.8f));
    phantomGroup->addModifier(SPK::EmitterAttacher::create(trailGroup,emitter,true));

    trailGroup->setName("Trail");
    trailGroup->setLifeTime(0.5f,1.0f);
    trailGroup->setRadius(0.06f);
    trailGroup->setRenderer(mRenderer);
    trailGroup->setColorInterpolator(SPK::ColorSimpleInterpolator::create(0xFF802080,0xFF000000));
    trailGroup->setParamInterpolator(SPK::PARAM_TEXTURE_INDEX,SPK::FloatRandomInitializer::create(0.0f,4.0f));
    trailGroup->setParamInterpolator(SPK::PARAM_ROTATION_SPEED,SPK::FloatRandomInitializer::create(-0.1f,1.0f));
    trailGroup->setParamInterpolator(SPK::PARAM_ANGLE,SPK::FloatRandomInitializer::create(0.0f,2.0f * 3.14159f));
    trailGroup->addModifier(SPK::Rotator::create());
    trailGroup->addModifier(SPK::Destroyer::create(ground));


Now I want to render it, in main cycle:

Code: [Select]

   mSystem->updateParticles(dSeconds)

    SPK::GL::GLRenderer::saveGLStates();

    glDisableClientState(GL_COLOR_ARRAY);
    glDisable(GL_TEXTURE_2D);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);

    // Render particles and set back prev states
    mSystem->renderParticles();

    SPK::GL::GLRenderer::restoreGLStates();

And I see fully black screen.

When I remove code related to emitters and settings texture I see my scene but everything is white. What could it be?

6

Graphics / Line shape

« on: January 30, 2012, 10:11:54 pm »

Hello, after new upgrade in sfml api I founded that sf::Shape::Line, for example was removed. So now the only way to do is to create polygon with 2 points?

7

Window / OIS as an input system

« on: November 07, 2011, 11:57:00 pm »

Hello, I have to include some of input system into sfml because It's not enough to catch them from main cycle but I need in callbacks for events. So I decided to use OIS in my app. Here is the code:

Code: [Select]

   OIS::ParamList params;
    std::string window = boost::lexical_cast<std::string>(mWindow->GetSystemHandle());
    // Logging of window variable shows 6-digits number

    params.insert(std::make_pair(std::string("WINDOW"), window));

    mInputSystem = OIS::InputManager::createInputSystem(params);

mWindow is pointer to the sf::RenderWindow. When running app I get:

X Error of failed request:  BadAccess (attempt to access private resource denied)
  Major opcode of failed request:  2 (X_ChangeWindowAttributes)
  Serial number of failed request:  7
  Current serial number in output stream:  9

What's wrong?

8

General / How to catch mouse

« on: August 24, 2010, 09:10:52 am »

Hello, by default, mouse isn't catched by application, so I'm able to move cursor out the window area. How can I bind/catch it for my application?

9

General / Mouse press event

« on: August 17, 2010, 10:37:41 am »

Hello, I'm writing Application which uses SFML as input system. I use it with Ogre3d  engine. The part of creating sfml-window:

Code: [Select]

size_t mWindowHandle;
ogreWindow->getCustomAttribute("WINDOW", &mWindowHandle);
boost::shared_ptr<sf::Window> = mInputWindow = boost::shared_ptr<sf::Window>( new sf::Window(mWindowHandle) );

And in global update cycle:

Code: [Select]

sf::Event localEvent;

while(mInputWindow->GetEvent(localEvent))
{
     using namespace Engine::Events;
     sf::Event::EventType type = localEvent.Type;

     if (type == sf::Event::MouseButtonPressed) { cout << "Mouse bbutton pressed!"; }
     else if (type == sf::Event::MouseButtonReleased) { cout << "Mouse button released!"; }
}

The text never writes to the console. All another events work (I tested key events). Also I could work with input handle mInputWindow->GetInput(). Using it I can show the cursor position, show/hide it, etc. All this stuff works.

I tried to do something like (in global cycle too):        

Code: [Select]

if (mInputWindow->GetInput().IsMouseButtonDown(sf::Mouse::Left))
{
   cout << "Left mouse button is pressed!";
}
Thid doesn't work too.
What could it be?

10

Window / Cursor manipulation

« on: July 11, 2010, 07:46:21 pm »

Hello, I'm using SFML with Ogre. I'm taking the handle like this:

Code: [Select]

size_t handle;
OgreWindow->getCustomAttribute("WINDOW", &handle);
sf::Window winHandle;
winHandle.Create(handle);

Now I need to hide cursor and move it to the center of the window:

Code: [Select]

winHandle.SetCursorPosition(GetWidth()/2, GetHeight()/2);
winHandle.ShowMouseCursor(false);
But nothing happens. Native SFML events work fine. What's wrong is there?