radeonsi: Assorted depth/stencil changes ported from r600g.

[ Squashed port of the following r600g commits: - Michel Dänzer ]

commit c1e8c845ea9c6f843cc5bba5974668c007799bbc
Author: Marek Olšák <[email protected]>
Date:   Sat Jul 7 19:10:00 2012 +0200

    r600g: inline r600_hw_copy_region

commit 4891c5dc64ccd8cf2bf8a8550ae23e1a61806a7d
Author: Marek Olšák <[email protected]>
Date:   Mon Jun 25 22:53:21 2012 +0200

    r600g: inline r600_blit_push_depth and use resource_copy_region

    We are going to have a separate resource for depth texturing and transfers
    and this is just a transfer thing.

commit da98bb6fc105e1a2f688a1713ca9e50f0ac8fbed
Author: Marek Olšák <[email protected]>
Date:   Mon Jun 25 12:45:32 2012 +0200

    r600g: split flushed depth texture creation and flushing

Signed-off-by: Michel Dänzer <[email protected]>

1 files changed, 7 insertions, 2 deletions

diff --git a/src/gallium/drivers/radeonsi/si_state.c b/src/gallium/drivers/radeonsi/si_state.c
index ee353edb816..fe3efb6adc9 100644
--- a/src/gallium/drivers/radeonsi/si_state.c
+++ b/src/gallium/drivers/radeonsi/si_state.c
@@ -1585,8 +1585,9 @@ static void si_cb(struct r600_context *rctx, struct si_pm4_state *pm4,
 		rctx->have_depth_fb = TRUE;
 
 	if (rtex->depth && !rtex->is_flushing_texture) {
-	        r600_texture_depth_flush(&rctx->context, state->cbufs[cb]->texture, TRUE);
+	        r600_init_flushed_depth_texture(&rctx->context, state->cbufs[cb]->texture);
 		rtex = rtex->flushed_depth_texture;
+		assert(rtex);
 	}
 
 	offset = rtex->surface.level[level].offset;
@@ -2083,8 +2084,12 @@ static struct pipe_sampler_view *si_create_sampler_view(struct pipe_context *ctx
 	}
 
 	if (tmp->depth && !tmp->is_flushing_texture) {
-		r600_texture_depth_flush(ctx, texture, TRUE);
+		r600_init_flushed_depth_texture(ctx, texture);
 		tmp = tmp->flushed_depth_texture;
+		if (!tmp) {
+			FREE(view);
+			return NULL;
+		}
 		texture = &tmp->resource.b.b;
 	}