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i965: Fix gl_FrontFacing emit on pre-gen6.

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It's amazing this code worked.  Basically, we would get lucky in
register allocation and the tests using frontfacing would happen to
allocate gl_FrontFacing storage and the instructions generating
gl_FrontFacing but pointing at another register to the same hardware
register.  Noticed during register spilling debug, when suddenly they
didn't get allocatd the same storage.
This commit is contained in:
Eric Anholt 2010-10-20 15:21:53 -07:00
parent 5ac6c4ecfe
commit 7a3f113e79
1 changed files with 0 additions and 1 deletions
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src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -503,7 +503,6 @@ fs_visitor::emit_frontfacing_interpolation(ir_variable *ir)
*reg,
fs_reg(1)));
} else {
fs_reg *reg = new(this->mem_ctx) fs_reg(this, ir->type);
struct brw_reg r1_6ud = retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_UD);
/* bit 31 is "primitive is back face", so checking < (1 << 31) gives
* us front face