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vc4: Use Newton-Raphson on the 1/W write to fix glmark2 terrain. 

The 1/W was apparently not accurate enough, and we were getting sparklies
in the distance.  The closed driver also did a N-R step here.

Cc: <mesa-stable@lists.freedesktop.org>
This commit is contained in:
Eric Anholt 2016-11-04 13:41:20 -07:00
parent 70fc3a941a
commit 283d4d18e5
1 changed files with 1 additions and 1 deletions
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2
src/gallium/drivers/vc4/vc4_program.c
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@ -1421,7 +1421,7 @@ emit_vert_end(struct vc4_compile *c,
struct vc4_varying_slot *fs_inputs,
uint32_t num_fs_inputs)
{
struct qreg rcp_w = qir_RCP(c, c->outputs[c->output_position_index + 3]);
struct qreg rcp_w = ntq_rcp(c, c->outputs[c->output_position_index + 3]);
emit_stub_vpm_read(c);