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GUIs in OpenGL

  • Sack TV
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    Problem Description

    I’m trying to make a GUI in my OpenGL project, that obviously is allways in front of everything. Im now doing this by disabling the depthtest before i render GUI elements and then i activate it again, so my code looks like this:

    glDepthFunc(GL_NOTEQUAL);

    //Draw GUI elements         

    glDepthFunc(GL_LESS);

    But how can i use screen coordinates to draw my elements, so that i can detect if they were clicked? 

  • Sonar Systems admin
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    What are you using for the GUI?

  • Sack TV
    Likes 0

    SDL2 

  • Sonar Systems admin
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    I would recommend using this https://forums.libsdl.org/viewtopic.php?p=51910 

  • Sack TV
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    You probably didn't understand what i want to do. I want to make a GUI in OpenGL. I just need to know how to switch the coordinate system to screen-coordinates, so that i can check with SDL if the location on the screen was clicked.

  • Sonar Systems admin
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  • Sack TV
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    You don't understand, I don’t want to use SDL for my GUI, I want to draw OpenGL stuff with screen coordinates. 

    Is there something like the glm::perspective for screen coordinates. So that OpenGL doesn't draw with 3D room coordinates. 

  • Sonar Systems admin
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