gallium: Add a pipe cap for whether primitive restart works for patches.

Some hardware supports primitive restart on patch primitives, and other
hardware does not.  Modern GL and ES include a query for this feature;
adding a capability bit will allow us to answer it.

As far as I know, AMD hardware does not support this feature, while
NVIDIA and Intel hardware does.  However, most Gallium drivers do not
appear to support tessellation shaders yet.  So, I've enabled it for
nvc0 and disabled it everywhere else.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Ilia Mirkin <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/gallium/drivers/swr/swr_screen.cpp b/src/gallium/drivers/swr/swr_screen.cpp
index 196f6dc801b..07722746ea4 100644
--- a/src/gallium/drivers/swr/swr_screen.cpp
+++ b/src/gallium/drivers/swr/swr_screen.cpp
@@ -359,6 +359,7 @@ swr_get_param(struct pipe_screen *screen, enum pipe_cap param)
    case PIPE_CAP_PCI_FUNCTION:
    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
    case PIPE_CAP_CULL_DISTANCE:
+   case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
       return 0;
    }