http://bugs.freedesktop.org/show_bug.cgi?id=11448
Summary: Clamp DEPTH_COMPONENT value too much times
Product: Mesa
Version: CVS
Platform: Other
OS/Version: Linux (All)
Status: NEW
Severity: minor
Priority: low
Component: Mesa core
AssignedTo: mesa3d-dev@lists.sourceforge.net
ReportedBy: [EMAIL PROTECTED]
CC: [EMAIL PROTECTED], [EMAIL PROTECTED]
In function _mesa_unpack_depth_span (src/mesa/main/image.c), depth values are
clamped in macro DEPTH_VALUES, then clamp again in _mesa_scale_and_bias_depth
if ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0. So DEPTH_VALUES
maybe clamped two times.
According to OpenGL spec, glDrawPixels will clamp color values in the last
step.
We need not clamp values in macro DEPTH_VALUES and we need clamp values after
_mesa_scale_and_bias_depth.
About change was introduced by commit bb02092d749ff9d58a13fd99f66154504b4f3dd1.
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