Stencil and TOpenGLControl

[Mathias]

I want to get Stencil to work with OpenGLControl.
With SDL2 this works as follows.
     

Code: Pascal  [Select][+][-]

1.   SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
2.   SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
3.   SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
4.   SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 1);

Now I wanted to try it with OpenGLControl and did the following.

Code: Pascal  [Select][+][-]

1.    OpenGLControl1.OpenGLMinorVersion := 3;
2.    OpenGLControl1.OpenGLMajorVersion := 3;
3.    OpenGLControl1.StencilBits := 1;

Only then will unfortunately nothing be drawn at all.

If I don't do any of this at all, then Stencil is simply ignored, so it must be related to context creation.

Anyone have an idea how to do it with OpenGLControl?

[Lulu]

Hi Mathias, I just read your post.
I use stencil buffer with OpenGLControl (to clip child surface when drawing them on their parent)
with:

Code: Pascal  [Select][+][-]

1. OpenGLControl1.StencilBits := 8; // I need 8 bits on stencil
2. ...
3. glClear(GL_COLOR_BUFFER_BIT or GL_STENCIL_BUFFER_BIT); // clear the buffer color and stencil
4. glEnable(GL_STENCIL_TEST);
5. some drawing...

No problem here (windows10) with OpenGLControl.

[Mathias]

Code: Pascal  [Select][+][-]

1. OpenGLControl1 . SchabloneBits : = 8

Thanks, that was exactly the problem.