3d graphics

NoiseEHC NoiseEHC at freemail.hu
Wed May 30 11:55:23 EDT 2007

I have read the OpenGL thread and at that time displaying was a problem.
However I noticed that SDL_CreateYUVOverlay does the exact same thing, 
the only question is: does it allow creating two of them and flipping?

Regarding the renderer: as Quake I was able to do it without 3dNow and 
MMX, the Geode will be able as well... :)

Can I ask about the Geode's instruction scheduling here in this list?

Jordan Crouse wrote:
> On 30/05/07 13:33 +0200, NoiseEHC wrote:
>> Hi!
>> I have read through the GeodeLX documentation and I noticed that its DC 
>> can output a video stream over the normal (1200x900) frame buffer.
>> Can the X11 developers create a mode with the following spec?
>> 1. Software can request allocating two YUV (4:2:0 or 4:2:2) frame 
>> buffers in the Software's address space with the given dimensions (eg 
>> 400x300).
>> 2. Software can request displaying one of those frames in the defined 
>> size (as I understand the DC will upscale the video if needed).
>> 3. Software can render in YUV to one of the frames.
>> 4. Software can request flipping to the other frame. (If I read 
>> correctly the switch will happen on vsync.)
>> 5. goto 3. (The Software can start rendering (vertex 
>> transformations/triangle setup/lightning) but have to wait for the vsync 
>> somehow...)
>> 6. And now we have an usable display system for an OpenGL implementation.
> Unfortunately, its not getting the image on the screen thats the problem,
> its the rendering and math.  A processor like this just can't keep up
> with any serious sort of realtime 3D rendering.  Even with a video overlay
> implementation, you still have to render the whole image before sending
> it up through Xv, and thats where you will fall down.
> But, if you want to try, then be my guest.  The Xv driver has everything
> you need to render YUV images to the screen - just make yourself an 
> Xv application and swing for the fences.
> Jordan
> ---
> Jordan Crouse
> Senior Linux Engineer
> Advanced Micro Devices, Inc.
> <www.amd.com/embeddedprocessors>

More information about the Devel mailing list