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)?
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.
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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=1Very fast and good UI response, CPU-Load around 20% with animations running
2. PowerVR disabled, BSP_XRPLUGIN_OPENGL=0Response still ok, but CPU-Load around 75-100% with animations running
3. PowerVR disabled, BSP_XRPLUGIN_DDRAW=1Response 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
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