Add Direct3D 12 RenderingDevice implementation

modules/glslang/register_types.cpp

@@ -67,6 +67,13 @@ static Vector<uint8_t> _compile_shader_glsl(RenderingDevice::ShaderStage p_stage
 		} else {
 			// use defaults
 		}
+	} else if (capabilities->device_family == RenderingDevice::DeviceFamily::DEVICE_DIRECTX) {
+		// NIR-DXIL is Vulkan 1.1-conformant.
+		ClientVersion = glslang::EShTargetVulkan_1_1;
+		// The SPIR-V part of Mesa supports 1.6, but:
+		// - SPIRV-Reflect won't be able to parse the compute workgroup size.
+		// - We want to play it safe with NIR-DXIL.
+		TargetVersion = glslang::EShTargetSpv_1_3;
 	} else {
 		// once we support other backends we'll need to do something here
 		if (r_error) {