Current status of EGL spec
mdanzer at ati.com
Thu Aug 11 04:49:42 EST 2005
On Wed, 2005-08-10 at 08:17 -0600, Brian Paul wrote:
> Jon Smirl wrote:
> > 3) Should eglScreenPositionMESA(EGLDisplay dpy, EGLScreenMESA screen,
> > EGLint x, EGLint y) instead use EGLint *x, EGLint *y. That would allow
> > hardwar
> You got chopped off there, but I think I know what you're getting at
> (return the actual position in case 1-pixel positioning isn't supported).
> First, OpenGL conventionally doesn't use in/out parameters like that.
> Second, how common is it that hardware can't support 1-pixel
> positioning? If it's not a common problem, I'd defer for a future
> extension which would allow you to query the positioning granularity.
As mentioned by Jon, our current hardware can only position the CRTC
offset with a granularity of 8 bytes (i.e. 2-8 horizontal pixels).
Upcoming hardware will only support horizontal panning with a
granularity of four pixels (irrespective of depth).
Michel Danzer, Linux Software Engineering \ Tel: +1 905-882-2600
ATI Technologies Inc., Markham, Ontario, Canada \ Extension: 3550
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