http://bugs.freedesktop.org/show_bug.cgi?id=10821
Summary: GLSL built-in mix functions takes arguments in wrong
order.
Product: Mesa
Version: 6.5
Platform: All
OS/Version: Linux (All)
Status: NEW
Severity: critical
Priority: high
Component: Mesa core
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
OpenGL spec indicates that mix has the following prototype:
genType mix(genType x, genType y, genType);
And performs the following function:
return = x*(1-a) + y*a;
-----------------------------------------
Mesa seems to want to take the arguments in reverse order to get the proper
result. To get a shader that works for an NVidia card in other contexts - I
might have a line that looks like:
float color = clamp(mix(x,y,a), 0.0, 1.0);
to get the same effect, I have to modify my shader as follows:
float color = clamp(mix(a,y,x), 0.0, 1.0);
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