nir/spirv: implement BuiltInWorkDim

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>

src/compiler/nir/nir.c

@@ -1758,6 +1758,8 @@ nir_intrinsic_from_system_value(gl_system_value val)
       return nir_intrinsic_load_local_group_size;
    case SYSTEM_VALUE_GLOBAL_INVOCATION_ID:
       return nir_intrinsic_load_global_invocation_id;
+   case SYSTEM_VALUE_WORK_DIM:
+      return nir_intrinsic_load_work_dim;
    default:
       unreachable("system value does not directly correspond to intrinsic");
    }

src/compiler/nir/nir_intrinsics.py

@@ -452,6 +452,7 @@ system_value("num_subgroups", 1)
 system_value("subgroup_id", 1)
 system_value("local_group_size", 3)
 system_value("global_invocation_id", 3)
+system_value("work_dim", 1)
 
 # Blend constant color values.  Float values are clamped.#
 system_value("blend_const_color_r_float", 1)

src/compiler/shader_enums.c

@@ -240,6 +240,7 @@ gl_system_value_name(gl_system_value sysval)
      ENUM(SYSTEM_VALUE_NUM_WORK_GROUPS),
      ENUM(SYSTEM_VALUE_LOCAL_GROUP_SIZE),
      ENUM(SYSTEM_VALUE_GLOBAL_GROUP_SIZE),
+     ENUM(SYSTEM_VALUE_WORK_DIM),
      ENUM(SYSTEM_VALUE_DEVICE_INDEX),
      ENUM(SYSTEM_VALUE_VIEW_INDEX),
      ENUM(SYSTEM_VALUE_VERTEX_CNT),

src/compiler/shader_enums.h

@@ -586,6 +586,7 @@ typedef enum
    SYSTEM_VALUE_NUM_WORK_GROUPS,
    SYSTEM_VALUE_LOCAL_GROUP_SIZE,
    SYSTEM_VALUE_GLOBAL_GROUP_SIZE,
+   SYSTEM_VALUE_WORK_DIM,
    /*@}*/
 
    /** Required for VK_KHR_device_group */

src/compiler/spirv/vtn_variables.c

@@ -1208,6 +1208,10 @@ vtn_get_builtin_location(struct vtn_builder *b,
       *location = FRAG_RESULT_STENCIL;
       vtn_assert(*mode == nir_var_shader_out);
       break;
+   case SpvBuiltInWorkDim:
+      *location = SYSTEM_VALUE_WORK_DIM;
+      set_mode_system_value(b, mode);
+      break;
    case SpvBuiltInGlobalSize:
       *location = SYSTEM_VALUE_GLOBAL_GROUP_SIZE;
       set_mode_system_value(b, mode);