ilo: prefix 3DSTATE_VF with gen75

3DSTATE_VF is Gen7.5+ only.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add variants of 3DSTATE_CLIP

Add gen6_disable_3DSTATE_CLIP to disable clipping.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add variants of 3DSTATE_WM

Add gen6_hiz_3DSTATE_WM() and gen7_hiz_3DSTATE_WM() for HiZ ops without
dispatching.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add variants of 3DSTATE_PS

Add gen7_disable_3DSTATE_PS() to disable PS.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add variants of 3DSTATE_VS

Add gen6_disable_3DSTATE_VS() to disable VS.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add variants of 3DSTATE_GS

Add gen6_so_3DSTATE_GS(), gen6_disable_3DSTATE_GS(), and
gen7_disable_3DSTATE_GS() to do SO on GEN6 or to disable GS.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add variants of 3DSTATE_{HS,DS}

Rename them to gen7_disable_3DSTATE_{HS,DS}() to reflect the fact.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add gen6_3dstate_constant()

It replaces gen6_fill_3dstate_constant().  gen6_3DSTATE_CONSTANT_{VS,GS,PS}
are made wrappers of the new function.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: add 3DSTATE_SO_BUFFER variants

Add gen7_disable_3DSTATE_SO_BUFFER() to disable SO buffers.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: rework gen7_3DSTATE_SO_DECL_LIST()

Started to make pipe_stream_output_info mandatory, but ended up adding support
for stream id and making a workaround Gen7-specific.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: clean up gen7_3DSTATE_STREAMOUT()

Render stream and render enable are independent from so enable.  Having a
single return point makes it easier to see that.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
ilo: clean up gen6_3DSTATE_SF()

Make the helpers fill out valid Gen7 3DSTATE_SF and 3STATE_SBE.  This
prevents the helpers from having to do

  dw[0] = GEN7_SBE_DW1_x; // setting DW1 value to dw[0]!?

and simplifies gen7_3DSTATE_{SF,SBE}().

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>