http://bugs.freedesktop.org/show_bug.cgi?id=12191
Summary: ARB_vertex_program's LG2 directive is imprecision
Product: Mesa
Version: CVS
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: trivial
Priority: lowest
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
The calculation of LG2 directive is imprecision. For example,
PARAM LG2const = { 1.300000, 1.500000, 1.700000, 9.900000 };
LG2 otex, LG2const.x;
Value of otex will be 0.37000.
The precision value should be log(1.3)/log(2)=0.3785.
It seems LG2 always reserve 2 number after decimal point.
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