i915g: implement hw clear

Benefits:
- spares us a relocation.
- needed for zone rendering (if that ever happens).
- just awesome.

v2: Rename the debug option. Completely disabling the blitter is
required for Y tiling to work, so this option will cover other
code paths in the future.

v3: Implement suggestions by Jakob Bornecrantz.

Signed-off-by: Daniel Vetter <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/i915/i915_screen.h b/src/gallium/drivers/i915/i915_screen.h
index 60f0e2971e0..cfc585b5350 100644
--- a/src/gallium/drivers/i915/i915_screen.h
+++ b/src/gallium/drivers/i915/i915_screen.h
@@ -49,6 +49,7 @@ struct i915_screen
    struct {
       boolean tiling;
       boolean lie;
+      boolean use_blitter;
    } debug;
 };