Home >Backend Development >C++ >How to Render an OpenGL Frame Within a C Builder Form?
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
<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>
<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
<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
<code class="cpp">glBegin(GL_QUADS); ... glEnd();</code>
Additional Notes
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