How to Render an OpenGL Frame in a C Builder Form Using TForm::Handle?

Rendering an OpenGL Frame in C Builder

Question

I want to render an OpenGL frame within a form in C Builder, but I'm encountering issues when following provided OpenGL startup code. How can I resolve this?

Answer

Utilizing TForm::Handle as Window Handle

The solution lies in using TForm::Handle as the window handle.

Sample Implementation

Here's an example adapted from an older version of C Builder:

<code class="cpp">int TForm1::ogl_init()
{
    if (ogl_inicialized)
        return 1;
    hdc = GetDC(Form1->Handle); // Get device context
    PIXELFORMATDESCRIPTOR pfd;
    // Set pixel format for the DC
    ...
    // Create current rendering context
    hrc = wglCreateContext(hdc);
    if (hrc == NULL)
    {
        ShowMessage("Could not initialize OpenGL Rendering context !!!");
        ogl_inicialized = 0;
        return 0;
    }
    if (!wglMakeCurrent(hdc, hrc))
    {
        wglDeleteContext(hrc); // Destroy rendering context
        ogl_inicialized = 0;
        return 0;
    }
    // ...
    ogl_inicialized = 1;
    return 1;
}</code>

Additional Notes

• Include the necessary headers: and
• Create a timer to trigger rendering.
• Handle events for form resize, repaint, and mouse wheel input.
• Ensure gl.h is included in the project.
• Consult the provided links for more advanced OpenGL techniques.

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