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 <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/gallium/drivers/i915/i915_state_static.c b/src/gallium/drivers/i915/i915_state_static.c
index 20cd23f8f7..fbbcf94fd1 100644
--- a/src/gallium/drivers/i915/i915_state_static.c
+++ b/src/gallium/drivers/i915/i915_state_static.c
@@ -167,6 +167,8 @@ static void update_framebuffer(struct i915_context *i915)
       i915_set_flush_dirty(i915, I915_PIPELINE_FLUSH);
    }
    i915->current.draw_size = (w - 1 + x) | ((h - 1 + y) << 16);
+   i915->current.fb_height = h;
+   i915->current.fb_width = w;
 
    i915->hardware_dirty |= I915_HW_STATIC;