uncertainty over the domain for which output occurs
Hi there,
An old issue, first mentioned in:
http://forums.amd.com/devforum/messageview.cfm?catid=328&threadid=98181
still seems to be present unfortunately. Consider a simple IL program that writes wWinCoord.x to either o0 or g[int(wWinCoord.x)] or both, operating on a 1d domain (CALdomain dom={a,0,w,0}
. If
A: you a run a program with a output buffer o0 for output, non-zero output appears in the output buffer for elements from a to a+w-1
B: you run a program with a global buffer g[] for output, non-zero output appears from a to w-1
C: you run a program with both o0 and g[] for output, non-zero output appears in both buffers form a to a+w-1.
The kind of program I have in mind in case C is...
il_ps_2_0
dcl_input_position_interp(linear_noperspective) vWinCoord0.xy__
dcl_output_generic o0
ftoi r0,vWinCoord0.xy00
itof r1,r0
mov g[r0.x],r1.x
mov o0,r1.x
ret_dyn
end
For case A comment out the mov g[r0.x],r1.x whereas for case B comment out dcl_output_generic o0 and mov o0,r1.x.
Note the difference in the element for which output ends. When output buffers are involved, it is as though the last two elements of a CALdomain give you the width and height whereas without output buffers the last two elements give you the bottom right corner.
Best,
Steven.
