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[Bug 15444] New: DrawPixel has one pixel bias if component is GL_DEPTH_COMPONENT

From: <bugzilla-daemon@fr...> - 2008-04-11 07:20

http://bugs.freedesktop.org/show_bug.cgi?id=15444

           Summary: DrawPixel has one pixel bias if component is
                    GL_DEPTH_COMPONENT
           Product: Mesa
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Drivers/DRI/i915
        AssignedTo: haihao.xiang@...
        ReportedBy: nian.wu@...
                CC: dri-devel@...


If draw a polygon with depth value, then read it back, there is one pixel bias.

Please see bug #15194 comment6.
http://bugs.freedesktop.org/show_bug.cgi?id=15194#c6

The bug exists on both i915 and i965.


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Thread	Author	Date
[Bug 15444] New: DrawPixel has one pixel bias if component is GL_DEPTH_COMPONENT	<bugzilla-daemon@fr...>

[Bug 15444] Draw polygon has one pixel bias if PolygonMode is GL_LINE)

From: <bugzilla-daemon@fr...> - 2008-04-14 05:43

http://bugs.freedesktop.org/show_bug.cgi?id=15444


WuNian <nian.wu@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|DrawPixel has one pixel bias|Draw polygon has one pixel
                   |if component is             |bias if PolygonMode is
                   |GL_DEPTH_COMPONENT          |GL_LINE)




--- Comment #1 from WuNian <nian.wu@...>  2008-04-13 22:42:53 PST ---
The bug results from the PolygonMode is set as GL_LINE.
If set the PolygonMode as GL_LINE, then polygon will be drawn with one pixel
bias(only the left line).


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[Bug 15444] Draw polygon has one pixel bias if PolygonMode is GL_LINE)

From: <bugzilla-daemon@fr...> - 2008-04-14 05:45

http://bugs.freedesktop.org/show_bug.cgi?id=15444





--- Comment #2 from WuNian <nian.wu@...>  2008-04-13 22:44:47 PST ---
Created an attachment (id=15888)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=15888)
test case


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[Bug 15444] [OGL] Draw polygon has one pixel bias if PolygonMode is GL_LINE

From: <bugzilla-daemon@fr...> - 2009-01-23 05:40

http://bugs.freedesktop.org/show_bug.cgi?id=15444


Gordon Jin <gordon.jin@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Draw polygon has one pixel  |[OGL] Draw polygon has one
                   |bias if PolygonMode is      |pixel bias if PolygonMode is
                   |GL_LINE)                    |GL_LINE




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[Bug 15444] [OGL] Draw polygon has one pixel bias if PolygonMode is GL_LINE

From: <bugzilla-daemon@fr...> - 2009-05-21 03:54

http://bugs.freedesktop.org/show_bug.cgi?id=15444


Gordon Jin <gordon.jin@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |20277

Eric Anholt <eric@...> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |NOTABUG




--- Comment #3 from Eric Anholt <eric@...>  2009-05-20 20:54:48 PST ---
The spec allows the line rasterization to be off by a pixel in X or Y.  But in
the case of this test, the lines are being drawn exactly on the pixel
boundaries, so if the test was fixed to draw the lines along the middle of the
pixels, it would work fine on our hardware (and probably everyone else's, too).


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