radv: enable VK_EXT_shader_stencil_export

The driver already supports exporting the stencil value.

The following CTS test now pass:
dEQP-VK.pipeline.shader_stencil_export.op_replace

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/vulkan/radv_extensions.py

@@ -100,6 +100,7 @@ EXTENSIONS = [
     Extension('VK_EXT_global_priority',                   1, 'device->rad_info.has_ctx_priority'),
     Extension('VK_EXT_sampler_filter_minmax',             1, 'device->rad_info.chip_class >= CIK'),
     Extension('VK_EXT_shader_viewport_index_layer',       1, True),
+    Extension('VK_EXT_shader_stencil_export',             1, True),
     Extension('VK_EXT_vertex_attribute_divisor',          1, True),
     Extension('VK_AMD_draw_indirect_count',               1, True),
     Extension('VK_AMD_gcn_shader',                        1, True),

src/amd/vulkan/radv_shader.c

@@ -222,6 +222,7 @@ radv_shader_compile_to_nir(struct radv_device *device,
 				.shader_viewport_index_layer = true,
 				.descriptor_array_dynamic_indexing = true,
 				.runtime_descriptor_array = true,
+				.stencil_export = true,
 			},
 		};
 		entry_point = spirv_to_nir(spirv, module->size / 4,