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- program SimpleLoadFromFile;
-
- {$mode objfpc}{$H+}
-
- uses
- {$IFDEF UNIX}{$IFDEF UseCThreads}
- cthreads,
- {$ENDIF}{$ENDIF}
- Classes, Windows, SysUtils, dglOpenGL, glBitmap, Helper;
-
- var
- oglWindow: TOpenGLWindow;
- running: Boolean = true;
-
- function WindowProc(hWnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): LRESULT; stdcall;
- var
- data: TglBitmapData;
- begin
- case Msg of
- WM_DESTROY: begin
- running := false;
- end;
-
- WM_KEYDOWN: begin
- if wParam = VK_RETURN then begin
- data := TglBitmapData.Create; // create texture data object
- try
- TglBitmap2D.GrabScreen(0, 0, 800, 600, tfRGBA8ui1, data); // read pixels from frame buffer
- data.SaveToFile( // save data to file
- ExtractFilePath(ApplicationName) +
- 'screen.bmp', ftBMP);
- WriteLn('screen saved to screen.bmp');
- finally
- FreeAndNil(data); // free texture data object when done
- end;
- end;
- end;
- end;
- result := DefWindowProc(hWnd, Msg, wParam, lParam);
- end;
-
- procedure RenderLoop;
- begin
- glBegin(GL_TRIANGLES);
- glColor4f(1, 0, 0, 1); glVertex2f(400, 100);
- glColor4f(0, 1, 0, 1); glVertex2f(100, 500);
- glColor4f(0, 0, 1, 1); glVertex2f(700, 500);
- glEnd;
- end;
-
- begin
- oglWindow := CreateOpenGLWindow('GrapScreen (hit enter to grab screen)', 800, 600, @WindowProc);
- while running and ProgressMesages do begin
- RenderLoop;
- SwapBuffers(oglWindow.DC);
- end;
- DestroyOpenGLWindow(oglWindow);
- end.
-
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