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i965/fs: Add a function for getting a component of a 8 or 16-wide register 

Signed-off-by: Jason Ekstrand <jason.ekstrand@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2014-09-11 16:15:10 -07:00
parent 30d718c2fb
commit 65ddf6f404
1 changed files with 10 additions and 0 deletions
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10
src/mesa/drivers/dri/i965/brw_fs.h
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@ -162,6 +162,16 @@ offset(fs_reg reg, unsigned delta)
return reg;
}
static inline fs_reg
component(fs_reg reg, unsigned idx)
{
assert(reg.subreg_offset == 0);
assert(idx < reg.width);
reg.subreg_offset = idx * type_sz(reg.type);
reg.width = 1;
return reg;
}
/**
* Get either of the 8-component halves of a 16-component register.
*