spirv: handle multiview bits of SPV_NV_mesh_shader

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Acked-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14263>

src/compiler/shader_info.h

@@ -75,6 +75,7 @@ struct spirv_supported_capabilities {
    bool mesh_shading_nv;
    bool min_lod;
    bool multiview;
+   bool per_view_attributes_nv;
    bool physical_storage_buffer_address;
    bool post_depth_coverage;
    bool printf;

src/compiler/spirv/spirv_to_nir.c

@@ -1105,6 +1105,7 @@ struct_member_decoration_cb(struct vtn_builder *b,
    case SpvDecorationPatch:
    case SpvDecorationPerPrimitiveNV:
    case SpvDecorationPerTaskNV:
+   case SpvDecorationPerViewNV:
       break;
 
    case SpvDecorationSpecId:
@@ -1149,11 +1150,6 @@ struct_member_decoration_cb(struct vtn_builder *b,
       /* User semantic decorations can safely be ignored by the driver. */
       break;
 
-   case SpvDecorationPerViewNV:
-      /* TODO(mesh): Handle multiview. */
-      vtn_warn("Mesh multiview not yet supported. Needed for decoration PerViewNV.");
-      break;
-
    default:
       vtn_fail_with_decoration("Unhandled decoration", dec->decoration);
    }
@@ -4805,6 +4801,10 @@ vtn_handle_preamble_instruction(struct vtn_builder *b, SpvOp opcode,
          spv_check_supported(mesh_shading_nv, cap);
          break;
 
+      case SpvCapabilityPerViewAttributesNV:
+         spv_check_supported(per_view_attributes_nv, cap);
+         break;
+
       case SpvCapabilityShaderViewportMaskNV:
          spv_check_supported(shader_viewport_mask_nv, cap);
          break;

src/compiler/spirv/vtn_variables.c

@@ -837,6 +837,7 @@ vtn_get_builtin_location(struct vtn_builder *b,
       set_mode_system_value(b, mode);
       break;
    case SpvBuiltInLayer:
+   case SpvBuiltInLayerPerViewNV:
       *location = VARYING_SLOT_LAYER;
       if (b->shader->info.stage == MESA_SHADER_FRAGMENT)
          *mode = nir_var_shader_in;
@@ -865,6 +866,7 @@ vtn_get_builtin_location(struct vtn_builder *b,
          vtn_fail("invalid stage for SpvBuiltInViewportIndex");
       break;
    case SpvBuiltInViewportMaskNV:
+   case SpvBuiltInViewportMaskPerViewNV:
       *location = VARYING_SLOT_VIEWPORT_MASK;
       *mode = nir_var_shader_out;
       break;
@@ -1342,6 +1344,9 @@ gather_var_kind_cb(struct vtn_builder *b, struct vtn_value *val, int member,
    case SpvDecorationPerPrimitiveNV:
       vtn_var->var->data.per_primitive = true;
       break;
+   case SpvDecorationPerViewNV:
+      vtn_var->var->data.per_view = true;
+      break;
    default:
       /* Nothing to do. */
       break;