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PowerVR, OpenGL & DirectDraw on AM335x

MGun
Intellectual 895 points
Other Parts Discussed in Thread: AM3352, AM3358, OMAP3503

Hi community

I am a little bit confused, which software components are running on which hardware modules.
Am I able to used DirectDraw / OpenGL without a PowerVR (e.g. on the AM3352)?

Is there any built-in hardware support to rotate the display (like the VRFB on the AM37xx)?

Thanks
Michael 

  • 0
    Mastermind 9310 points

    OpenGL uses the SGX GPU through POWERVR libraries for 3D acceleration (SGX530 available on AM335x, need to check for available PoweVR libraries).

    DirectDraw uses hardware features of the Display subsystem controller (LCDCAI on AM335x) for 2D acceleration. You may use the DirectDraw compatible LCDCAI driver even if you don't use the SGX/OpenGL GPU.

    Unfortunately there is no hardware framebuffer rotator such as the VRFB on the AM335x family.

  • 0 in reply to Adeneo Embedded support team
    Intellectual 895 points

    Thank you very much!

    As an information: I have done some performance tests with my Silverlight Embedded application on AM335x EVM (AM3358 at 500MHz).

    1. PowerVR enabled, BSP_XRPLUGIN_OPENGL=1
    Very fast and good UI response, CPU-Load around 20% with animations running

    2. PowerVR disabled, BSP_XRPLUGIN_OPENGL=0
    Response still ok, but CPU-Load around 75-100% with animations running

    3. PowerVR disabled, BSP_XRPLUGIN_DDRAW=1
    Response really bad -> unusable, CPU-Load 100% with animations running

    I would have expected that DirectDraw should be faster than no acceleration at all.
    Is it still the same problem, as described in this thread for the OMAP3503? http://e2e.ti.com/support/embedded/wince/f/353/t/72810.aspx