Mesa (master): i965: Provide a context flag to let us enable fast clear

[Kristian Høgsberg]

Module: Mesa
Branch: master
Commit: cf89b29d2f87be8ca437049e5cf3df9f54a806b2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=cf89b29d2f87be8ca437049e5cf3df9f54a806b2

Author: Kristian Høgsberg <krh at bitplanet.net>
Date:   Mon Jul  7 16:27:31 2014 -0700

i965: Provide a context flag to let us enable fast clear

GEN7+ has the fast clear functionality, which lets us clear the color
buffers using the MCS and a scaled down rectangle.  To enable this
we have to set the appropriate bits in the 3DSTATE_PS package.

Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
Acked-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_context.h   |    1 +
 src/mesa/drivers/dri/i965/gen7_wm_state.c |    2 ++
 src/mesa/drivers/dri/i965/gen8_ps_state.c |    2 ++
 3 files changed, 5 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 01be5fb..1933182 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -1252,6 +1252,7 @@ struct brw_context
        * Gen6.  See brw_update_null_renderbuffer_surface().
        */
       drm_intel_bo *multisampled_null_render_target_bo;
+      uint32_t fast_clear_op;
    } wm;
 
 
diff --git a/src/mesa/drivers/dri/i965/gen7_wm_state.c b/src/mesa/drivers/dri/i965/gen7_wm_state.c
index c3e9316..278cf17 100644
--- a/src/mesa/drivers/dri/i965/gen7_wm_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_wm_state.c
@@ -246,6 +246,8 @@ upload_ps_state(struct brw_context *brw)
       ksp0 = brw->wm.base.prog_offset;
    }
 
+   dw4 |= brw->wm.fast_clear_op;
+
    BEGIN_BATCH(8);
    OUT_BATCH(_3DSTATE_PS << 16 | (8 - 2));
    OUT_BATCH(ksp0);
diff --git a/src/mesa/drivers/dri/i965/gen8_ps_state.c b/src/mesa/drivers/dri/i965/gen8_ps_state.c
index 49d4fe0..5e313bf 100644
--- a/src/mesa/drivers/dri/i965/gen8_ps_state.c
+++ b/src/mesa/drivers/dri/i965/gen8_ps_state.c
@@ -185,6 +185,8 @@ upload_ps_state(struct brw_context *brw)
    else
       dw6 |= GEN7_PS_POSOFFSET_NONE;
 
+   dw6 |= brw->wm.fast_clear_op;
+
    /* _NEW_MULTISAMPLE
     * In case of non 1x per sample shading, only one of SIMD8 and SIMD16
     * should be enabled. We do 'SIMD16 only' dispatch if a SIMD16 shader