OpenWindowedScreen() must be called before using any 3D

[tan9p]

On my other older machine, when running the same 3D example, the following error occurs. (Strangely enough, it runs without any issues on my current machine.)

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OpenWindowedScreen() must be called before using any 3D

After searching, some posts suggest that the problem might be due to the absence of DirectX 9 or outdated graphics card drivers or can use opengl subsystem..
https://www.purebasic.fr/english/viewtopic.php?t=52048
I'd like to know the exact cause of the above error. Can it be resolved by installing DirectX 9? and how to use openGL subsystem.
Thanks a lot!

[miso]

Hello tan9p!

If you use the same PB version, than the subsystem is the same. So I think it's graphics driver. (could not open the screen when called. IT can be checked with an if statement.) OpenGL is the supported subsystem. (and its the default, OpenGL in new, DirectX9 in older PB versions) For 2d there is a DirectX11 option. You can switch the subsystem in the compiler options/library subsystem field. [Personally, I only use the OpenGL default subsystem.]

[tan9p]

Hello miso!
I installed the DirectX, But the program still reports an error. Is it because the driver doesn't support it? There is no folder named "opengl" under the "subsystem" folder. Does the blank mean the default is OpenGL? Can it be understood that PureBasic 6.20 doesn't support the graphics card on my machine?

[Fred]

in 6.20, only OpenGL is supported for the 3D engine.

[miso]

Run this in debug mode. If it says could not open windowed screen, then your older machines videocard is not supported. (changing driver might or might not help) If everything is ok, you will see a black screen, that exits by pressing escape. (borrowed some code from Mijikai to write this test)

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If Not InitEngine3D() : Debug "Could not initialize 3d engine" :End: EndIf
If Not InitSprite() :  Debug "could Not initialize sprite engine" :End: EndIf
If Not InitKeyboard() : Debug "could not initialize keyboard" :End: EndIf
If Not OpenWindow(0,0,0,800,800,#Null$,#PB_Window_SystemMenu|#PB_Window_ScreenCentered) : Debug "could Not open window" :End: EndIf
If Not OpenWindowedScreen(WindowID(0),0,0,WindowWidth(0),WindowHeight(0)):Debug "could not open windowed screen on this graphic card" :End: EndIf

SetFrameRate(60)
camera = CreateCamera(#PB_Any,0,0,100,100)
MoveCamera(camera,0,0,100,#PB_Absolute)
CameraLookAt(camera,0,0,0)
light = CreateLight(#PB_Any,#White,0,0,100)
Repeat
  Repeat
    Select WindowEvent()
      Case #PB_Event_None
        Break
      Case #PB_Event_CloseWindow
        exit = #True
    EndSelect
  ForEver
  ExamineKeyboard()
  RenderWorld()
  FlipBuffers()
Until exit Or KeyboardPushed(#PB_Key_Escape)
CloseScreen() 
CloseWindow(0)

[tan9p]

Thanks!It says could not open windowed screen on this graphic card. So I think the machine does not support PureBasic 6.20.

[miso]

Try Pb 5.73. on that computer. You can download it from the archives. (5.73 is DirectX9 by default, if I remember well.)
If that works, you can experiment with versions up to 6.04.