[solved] transform vector to screen coord, outside the shaders

[TheNess]

hi all

How can get the worldview matrix in sfml?
or more specifically - I have a raw vector which I want to convert to screen position, i.e. the actual 2d pixel it will take on the screen if it was pushed through the rendering pipeline.

I tried the following (light.position is the raw position):

sf::Vector2f pos = m_window.getView().getTransform().transformPoint(light.position.x, light.position.y);
 

but from the shader it doesn't look right. I have a sprite and a light at the same position yet they seem far away. also, when I move the view (and update the shader) it doesn't move the light.

what am I doing wrong here?
thanks! 

[Laurent]

sf::Vector2i pixel = m_window.mapCoordToPixel(light.position);

[TheNess]

this seems to work perfectly on X axis but weird on Y axis.
it looks like the view position on Y axis is not calculated correctly: when view position is 0 the light position is at the bottom of the screen, and as I move the camera around the light move around on Y axis differently then the rest of the sprites.

EDIT:
ok this solves it:

pixel.y = m_window.getSize().y - pos.y;
 

thanks!