r600g: rework dirty / depth texture tracking.

this adds a flag to keep track of whether the depth texture structure
is the flushed texture or not, so we can avoid doing flushes when
we do a hw rendering from one to the other.

it also renames flushed to dirty_db which tracks if the DB copy
has been dirtied by being bound to the hw.

Signed-off-by: Dave Airlie <airlied@redhat.com>

src/gallium/drivers/r600/r600_blit.c

@@ -85,7 +85,8 @@ void r600_blit_uncompress_depth(struct pipe_context *ctx, struct r600_resource_t
 	int level = 0;
 	float depth = 1.0f;
 
-	if (texture->flushed) return;
+	if (!texture->dirty_db)
+		return;
 
 	surf_tmpl.format = texture->resource.base.b.format;
 	surf_tmpl.u.tex.level = level;
@@ -107,10 +108,11 @@ void r600_blit_uncompress_depth(struct pipe_context *ctx, struct r600_resource_t
 	r600_blitter_begin(ctx, R600_CLEAR_SURFACE);
 	util_blitter_custom_depth_stencil(rctx->blitter, zsurf, cbsurf, rctx->custom_dsa_flush, depth);
 	r600_blitter_end(ctx);
-	texture->flushed = true;
 
 	pipe_surface_reference(&zsurf, NULL);
 	pipe_surface_reference(&cbsurf, NULL);
+
+	texture->dirty_db = FALSE;
 }
 
 void r600_flush_depth_textures(struct r600_pipe_context *rctx)
@@ -132,9 +134,6 @@ void r600_flush_depth_textures(struct r600_pipe_context *rctx)
 		if (!tex->depth)
 			continue;
 
-		if (tex->tile_type == 0)
-			continue;
-
 		r600_blit_uncompress_depth(&rctx->context, tex);
 	}
 }

src/gallium/drivers/r600/r600_resource.h

@@ -61,9 +61,9 @@ struct r600_resource_texture {
 	unsigned			tiled;
 	unsigned			tile_type;
 	unsigned			depth;
-	unsigned			dirty;
+	unsigned			dirty_db;
 	struct r600_resource_texture	*flushed_depth_texture;
-	bool				flushed;
+	boolean				is_flushing_texture;
 };
 
 #define R600_BUFFER_MAGIC 0xabcd1600

src/gallium/drivers/r600/r600_state.c

@@ -429,7 +429,7 @@ static struct pipe_sampler_view *r600_create_sampler_view(struct pipe_context *c
 		R600_ERR("unknow format %d\n", state->format);
 	}
 	tmp = (struct r600_resource_texture *)texture;
-	if (tmp->depth && tmp->tile_type == 1) {
+	if (tmp->depth && !tmp->is_flushing_texture) {
 		r600_texture_depth_flush(ctx, texture);
 		tmp = tmp->flushed_depth_texture;
 	}
@@ -760,8 +760,6 @@ static void r600_db(struct r600_pipe_context *rctx, struct r600_pipe_state *rsta
 	surf = (struct r600_surface *)state->zsbuf;
 	rtex = (struct r600_resource_texture*)state->zsbuf->texture;
 
-	rtex->tile_type = 1;
-
 	rbuffer = &rtex->resource;
 
 	/* XXX quite sure for dx10+ hw don't need any offset hacks */

src/gallium/drivers/r600/r600_state_common.c

@@ -602,7 +602,7 @@ void r600_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info)
 	if (rctx->framebuffer.zsbuf)
 	{
 		struct pipe_resource *tex = rctx->framebuffer.zsbuf->texture;
-		((struct r600_resource_texture *)tex)->flushed = false;
+		((struct r600_resource_texture *)tex)->dirty_db = TRUE;
 	}
 
 	pipe_resource_reference(&draw.index_buffer, NULL);

src/gallium/drivers/r600/r600_texture.c

@@ -513,6 +513,7 @@ int r600_texture_depth_flush(struct pipe_context *ctx,
 		return -ENOMEM;
 	}
 
+	((struct r600_resource_texture *)rtex->flushed_depth_texture)->is_flushing_texture = TRUE;
 out:
 	/* XXX: only do this if the depth texture has actually changed:
 	 */
@@ -574,7 +575,7 @@ struct pipe_transfer* r600_texture_get_transfer(struct pipe_context *ctx,
 	trans->transfer.level = level;
 	trans->transfer.usage = usage;
 	trans->transfer.box = *box;
-	if (rtex->depth && rtex->tile_type == 1) {
+	if (rtex->depth) {
 		/* XXX: only readback the rectangle which is being mapped?
 		*/
 		/* XXX: when discard is true, no need to read back from depth texture