svga: Fix failures caused in fedora 24

SVGA_3D_CMD_DX_GENRATE_MIPMAP & SVGA_3D_CMD_DX_SET_PREDICATION commands
are not presents in fedora 24 kernel module. Because of this
reason application like supertuxkart are not running.

v2: Add few comments and code modifications suggested by Brian P.

Reviewed-by: Brian Paul <[email protected]>
Reviewed-by: Charmaine Lee <[email protected]>

1 files changed, 11 insertions, 5 deletions

diff --git a/src/gallium/drivers/svga/svga_pipe_query.c b/src/gallium/drivers/svga/svga_pipe_query.c
index 4febf9bd510..65e58fe0e68 100644
--- a/src/gallium/drivers/svga/svga_pipe_query.c
+++ b/src/gallium/drivers/svga/svga_pipe_query.c
@@ -1219,13 +1219,19 @@ svga_render_condition(struct pipe_context *pipe, struct pipe_query *q,
          sws->fence_finish(sws, sq->fence, SVGA_FENCE_FLAG_QUERY);
       }
    }
-
-   ret = SVGA3D_vgpu10_SetPredication(svga->swc, queryId,
-                                      (uint32) condition);
-   if (ret != PIPE_OK) {
-      svga_context_flush(svga, NULL);
+   /*
+    * if the kernel module doesn't support the predication command,
+    * we'll just render unconditionally.
+    * This is probably acceptable for the typical case of occlusion culling.
+    */
+   if (sws->have_set_predication_cmd) {
       ret = SVGA3D_vgpu10_SetPredication(svga->swc, queryId,
                                          (uint32) condition);
+      if (ret != PIPE_OK) {
+         svga_context_flush(svga, NULL);
+         ret = SVGA3D_vgpu10_SetPredication(svga->swc, queryId,
+                                            (uint32) condition);
+      }
    }
 }