Rendering an OpenGL Frame in C Builder
While customizing a C Builder form with OpenGL, it's common to encounter issues when directly copying OpenGL startup code from online resources. For those using C Builder, here's a detailed guide to render an OpenGL frame within a form:
Initialization
- In the form class header, define user-defined members as follows:
<code class="cpp">int xs, ys; HDC hdc; // device context HGLRC hrc; // rendering context int ogl_inicialized; int ogl_init(); void ogl_exit(); void ogl_draw(); void ogl_resize();</code>
- Create a timer with an interval of 20-40 milliseconds.
- In the form's events (e.g., resize, repaint, timer), add code similar to the following:
<code class="cpp">void __fastcall TForm1::FormResize(TObject* Sender)
{
ogl_resize();
}
void __fastcall TForm1::FormPaint(TObject* Sender)
{
ogl_draw();
}
void __fastcall TForm1::Timer1Timer(TObject* Sender)
{
ogl_draw();
}</code>
OpenGL Initialization
- Within the ogl_init() function, perform the following steps:
<code class="cpp">hdc = GetDC(Form1->Handle); // get device context
PIXELFORMATDESCRIPTOR pfd;
ZeroMemory(&pfd, sizeof(pfd)); // set the pixel format for the DC
...
if(wglMakeCurrent(hdc, hrc) == false)
{
ShowMessage("Could not make current OpenGL Rendering context !!!");
wglDeleteContext(hrc); // destroy rendering context
ogl_inicialized=0;
return 0;
}
...</code>
OpenGL Rendering
- In the ogl_draw() function, create and draw a primitive object (e.g., a quad):
<code class="cpp">glBegin(GL_QUADS); ... glEnd();</code>
Additional Notes
- Remember to include
header file. - You can use TForm::Handle as the window handle when initializing OpenGL.
- This example demonstrates a simple green quad in the center of the form.
- For more advanced OpenGL functionality (e.g., GLSL, VAO/VBO), refer to additional resources online.
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