Support the VK_INTEL_shader_integer_functions2 extension.

Docs/MoltenVK_Runtime_UserGuide.md

@@ -271,6 +271,7 @@ In addition to the core *Vulkan* API, **MoltenVK**  also supports the following
 - `VK_AMD_shader_image_load_store_lod` *(iOS)*
 - `VK_AMD_shader_trinary_minmax` *(requires Metal 2.1)*
 - `VK_IMG_format_pvrtc` *(iOS)*
+- `VK_INTEL_shader_integer_functions2`
 - `VK_NV_glsl_shader`
 
 In order to visibly display your content on *iOS* or *macOS*, you must enable the `VK_EXT_metal_surface` 

MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm

@@ -133,6 +133,11 @@ void MVKPhysicalDevice::getFeatures(VkPhysicalDeviceFeatures2* features) {
                     portabilityFeatures->samplerMipLodBias = false;
                     break;
                 }
+                case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_INTEGER_FUNCTIONS_2_FEATURES_INTEL: {
+                    auto* shaderIntFuncsFeatures = (VkPhysicalDeviceShaderIntegerFunctions2FeaturesINTEL*)next;
+                    shaderIntFuncsFeatures->shaderIntegerFunctions2 = true;
+                    break;
+                }
                 default:
                     break;
             }

MoltenVK/MoltenVK/Layers/MVKExtensions.def

@@ -75,6 +75,7 @@ MVK_EXTENSION(AMD_negative_viewport_height, AMD_NEGATIVE_VIEWPORT_HEIGHT)
 MVK_EXTENSION(AMD_shader_image_load_store_lod, AMD_SHADER_IMAGE_LOAD_STORE_LOD)
 MVK_EXTENSION(AMD_shader_trinary_minmax, AMD_SHADER_TRINARY_MINMAX)
 MVK_EXTENSION(IMG_format_pvrtc, IMG_FORMAT_PVRTC)
+MVK_EXTENSION(INTEL_shader_integer_functions2, INTEL_SHADER_INTEGER_FUNCTIONS_2)
 MVK_EXTENSION_LAST(NV_glsl_shader, NV_GLSL_SHADER)
 
 #undef MVK_EXTENSION