http://bugs.freedesktop.org/show_bug.cgi?id=21867
Summary: Feature request: Configurable pixel origin
Product: Mesa
Version: CVS
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [email protected]
In OpenGL and Direct3D 10 a pixel coordinate specifies the center of a pixel on
the screen. In Direct3D9 and earlier however, the origin is the top left corner
of a pixel.
This causes problems for Wine, because we have to move the geometry by half a
pixel to correct this difference. This is relatively painless with fixed
function vertex processing, but in vertex shaders we have to insert extra
instructions and occupy a shader constant / uniform to load these private
constants. This causes problems with apps using all 256 constants on dx9 cards,
and / or hitting the instruction limitation.
I have been told that most 3D hardware has a switch to switch between D3D and
OpenGL mode. An OpenGL extension that allows Wine to switch between these modes
would be very helpful. This switch could work as a glEnable / glDisable flag,
or if the hardware needs it, a pixel format flag or flag at context creation
would work too.
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