st/nine: Move stream_usage_mask to nine_context

Part of the refactor to move all gallium calls to
nine_state.c, and have all internal states required
for those calls in nine_context.

Signed-off-by: Axel Davy <axel.davy@ens.fr>
diff --git a/src/gallium/state_trackers/nine/nine_state.c b/src/gallium/state_trackers/nine/nine_state.c
index a4d84a0..0733d6e 100644
--- a/src/gallium/state_trackers/nine/nine_state.c
+++ b/src/gallium/state_trackers/nine/nine_state.c
@@ -607,7 +607,7 @@
     BOOL need_dummy_vbo = FALSE;
     struct pipe_vertex_element ve[PIPE_MAX_ATTRIBS];
 
-    state->stream_usage_mask = 0;
+    context->stream_usage_mask = 0;
     memset(vdecl_index_map, -1, 16);
     memset(used_streams, 0, device->caps.MaxStreams);
     vs = state->programmable_vs ? device->state.vs : device->ff.vs;
@@ -650,7 +650,7 @@
         if (index >= 0) {
             ve[n] = vdecl->elems[index];
             b = ve[n].vertex_buffer_index;
-            state->stream_usage_mask |= 1 << b;
+            context->stream_usage_mask |= 1 << b;
             /* XXX wine just uses 1 here: */
             if (state->stream_freq[b] & D3DSTREAMSOURCE_INSTANCEDATA)
                 ve[n].instance_divisor = state->stream_freq[b] & 0x7FFFFF;
@@ -1438,7 +1438,7 @@
     info->count = prim_count_to_vertex_count(type, count);
     info->start_instance = 0;
     info->instance_count = 1;
-    if (dev->state.stream_instancedata_mask & dev->state.stream_usage_mask)
+    if (dev->state.stream_instancedata_mask & dev->context.stream_usage_mask)
         info->instance_count = MAX2(dev->state.stream_freq[0] & 0x7FFFFF, 1);
     info->primitive_restart = FALSE;
     info->restart_index = 0;
diff --git a/src/gallium/state_trackers/nine/nine_state.h b/src/gallium/state_trackers/nine/nine_state.h
index 71a5293..7711a2b 100644
--- a/src/gallium/state_trackers/nine/nine_state.h
+++ b/src/gallium/state_trackers/nine/nine_state.h
@@ -181,7 +181,6 @@
     struct pipe_vertex_buffer  vtxbuf[PIPE_MAX_ATTRIBS];
     UINT stream_freq[PIPE_MAX_ATTRIBS];
     uint32_t stream_instancedata_mask; /* derived from stream_freq */
-    uint32_t stream_usage_mask; /* derived from VS and vdecl */
 
     struct pipe_clip_state clip;
 
@@ -225,6 +224,8 @@
 
     uint8_t rt_mask;
 
+    uint32_t stream_usage_mask; /* derived from VS and vdecl */
+
     DWORD rs[NINED3DRS_COUNT];
 
     struct NineBaseTexture9 *texture[NINE_MAX_SAMPLERS];