+ /* Create a fence, which is a dummy BO. */
+ *rfence = r300->rws->buffer_create(r300->rws, 1, 1,
+ PIPE_BIND_CUSTOM,
+ RADEON_DOMAIN_GTT);
+ /* Add the fence as a dummy relocation. */
+ r300->rws->cs_add_reloc(r300->cs,
+ r300->rws->buffer_get_cs_handle(*rfence),
+ RADEON_USAGE_READWRITE, RADEON_DOMAIN_GTT);
+ }
+
+ if (r300->dirty_hw) {
+ r300_flush_and_cleanup(r300, flags);
+ } else {
+ if (rfence) {
+ /* We have to create a fence object, but the command stream is empty
+ * and we cannot emit an empty CS. Let's write to some reg. */
+ CS_LOCALS(r300);
+ OUT_CS_REG(RB3D_COLOR_CHANNEL_MASK, 0);
+ r300->rws->cs_flush(r300->cs, flags);
+ } else {
+ /* Even if hw is not dirty, we should at least reset the CS in case
+ * the space checking failed for the first draw operation. */
+ r300->rws->cs_flush(r300->cs, flags);
+ }
+ }
+
+ /* Update Hyper-Z status. */
+ if (r300->num_z_clears) {
+ r300->hyperz_time_of_last_flush = os_time_get();
+ } else if (!r300->hyperz_time_of_last_flush > 2000000) {
+ /* 2 seconds without a Z clear pretty much means a dead context
+ * for HyperZ. */
+
+ r300->hiz_in_use = FALSE;
+
+ /* Decompress Z buffer. */
+ if (r300->zmask_in_use) {
+ if (r300->locked_zbuffer) {
+ r300_decompress_zmask_locked(r300);
+ } else {
+ r300_decompress_zmask(r300);
+ }
+
+ r300_flush_and_cleanup(r300, flags);
+ }
+
+ /* Release HyperZ. */
+ r300->rws->cs_request_feature(r300->cs, RADEON_FID_R300_HYPERZ_ACCESS,
+ FALSE);