Thank you Brian, these infos where of great help.
Best Regards,
Pierre
Brian Paul a écrit :
Pierre Boulenguez wrote:
Dear Mesa team,
First thank you for your work on Mesa and it's open sourcing.
I am looking for the GL_PERSPECTIVE_CORRECTION_HINT implementation
details.
If I am correct, as of openGL 2.1, this hint is of no more use as all
interpolations (color, texture coordinates, glsl varying vertex
attributes) are in a perspectivly correct form.
That's actually not the case yet in Mesa. Only texcoords and varying
vars are perspective corrected at this time. Thanks for reminding me
about that.
I grep'ed "GL_PERSPECTIVE_CORRECTION_HINT" on the 6.3.2 and 6.5.2
source trees, and followed the thread but was unable to conclude.
So am I asking if would point to me the relevant file/functions to
search for this interpolant.
The only place where GL_PERSPECTIVE_CORRECTION_HINT is used is in a
few semi-optimized triangle rasterizer functions. If you set
GL_PERSPECTIVE_CORRECTION_HINT to GL_FASTEST and set some other state
appropriately texcoords will be interpolated w/ integers w/out
perspective correctsion. See src/mesa/swrast/s_triangle.c
Otherwise, texcoords are always perspective corrected.
-Brian
begin:vcard
fn:Pierre Boulenguez
n:Boulenguez;Pierre
adr:;;;Paris;;;France
email;internet:[EMAIL PROTECTED]
x-mozilla-html:TRUE
version:2.1
end:vcard
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
Mesa3d-dev mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
