lavapipe: Implement VK_EXT_fragment_shader_interlock

This is a noop implementation because it is not possible for multiple
threads to access the same pixel during rasterization since it is
tiled.

Reviewed-by: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33628>

src/gallium/auxiliary/gallivm/lp_bld_nir_soa.c

@@ -5172,6 +5172,12 @@ visit_intrinsic(struct lp_build_nir_soa_context *bld,
       result[0] = load_ubo_base_addr(bld, get_src(bld, &instr->src[0], 0));
       break;
    }
+   case nir_intrinsic_begin_invocation_interlock:
+   case nir_intrinsic_end_invocation_interlock:
+      /* There is no need to do any synchronization here since llvmpipe rasterizes
+       * geometry using tiles and each tile is handled by only one thread at once.
+       */
+      break;
    default:
       fprintf(stderr, "Unsupported intrinsic: ");
       nir_print_instr(&instr->instr, stderr);

src/gallium/frontends/lavapipe/lvp_device.c

@@ -213,6 +213,7 @@ static const struct vk_device_extension_table lvp_device_extensions_supported =
    .EXT_extended_dynamic_state2           = true,
    .EXT_extended_dynamic_state3           = true,
    .EXT_external_memory_host              = true,
+   .EXT_fragment_shader_interlock         = true,
    .EXT_graphics_pipeline_library         = true,
    .EXT_hdr_metadata = true,
    .EXT_host_image_copy                   = true,
@@ -763,6 +764,11 @@ lvp_get_features(const struct lvp_physical_device *pdevice,
 
       /* VK_KHR_shader_quad_control */
       .shaderQuadControl = true,
+
+      /* VK_EXT_fragment_shader_interlock */
+      .fragmentShaderSampleInterlock = true,
+      .fragmentShaderPixelInterlock = true,
+      .fragmentShaderShadingRateInterlock = false,
    };
 }