nir/vtn: Add handling for SPIR-V event variables

Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6035>

src/compiler/spirv/spirv_to_nir.c

@@ -732,6 +732,7 @@ vtn_types_compatible(struct vtn_builder *b,
    case vtn_base_type_image:
    case vtn_base_type_sampler:
    case vtn_base_type_sampled_image:
+   case vtn_base_type_event:
       return t1->type == t2->type;
 
    case vtn_base_type_array:
@@ -787,6 +788,7 @@ vtn_type_copy(struct vtn_builder *b, struct vtn_type *src)
    case vtn_base_type_image:
    case vtn_base_type_sampler:
    case vtn_base_type_sampled_image:
+   case vtn_base_type_event:
       /* Nothing more to do */
       break;
 
@@ -1707,6 +1709,10 @@ vtn_handle_type(struct vtn_builder *b, SpvOp opcode,
       break;
 
    case SpvOpTypeEvent:
+      val->type->base_type = vtn_base_type_event;
+      val->type->type = glsl_int_type();
+      break;
+
    case SpvOpTypeDeviceEvent:
    case SpvOpTypeReserveId:
    case SpvOpTypeQueue:
@@ -1756,6 +1762,7 @@ vtn_null_constant(struct vtn_builder *b, struct vtn_type *type)
    case vtn_base_type_sampler:
    case vtn_base_type_sampled_image:
    case vtn_base_type_function:
+   case vtn_base_type_event:
       /* For those we have to return something but it doesn't matter what. */
       break;
 

src/compiler/spirv/vtn_private.h

@@ -324,6 +324,7 @@ enum vtn_base_type {
    vtn_base_type_sampler,
    vtn_base_type_sampled_image,
    vtn_base_type_function,
+   vtn_base_type_event,
 };
 
 struct vtn_type {