Merge pull request #370 from cdavis5e/shader-float16-int8

Support the VK_KHR_shader_float16_int8 extension.

Author: billhollings

Docs/MoltenVK_Runtime_UserGuide.md

@@ -235,6 +235,7 @@ In addition to the core *Vulkan* API, **MoltenVK**  also supports the following
 - `VK_KHR_relaxed_block_layout`
 - `VK_KHR_sampler_mirror_clamp_to_edge`
 - `VK_KHR_shader_draw_parameters`
+- `VK_KHR_shader_float16_int8`
 - `VK_KHR_storage_buffer_storage_class`
 - `VK_KHR_surface`
 - `VK_KHR_swapchain`

ExternalRevisions/Vulkan-Headers_repo_revision

@@ -1 +1 @@
-114c3546e195819bd53a34b39f5194b2989a5b12
+add65b83415824f59041486d4903ee1909dc6ee2

MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm

@@ -82,6 +82,13 @@
                 next = (VkStructureType*)storageFeatures->pNext;
                 break;
             }
+            case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_FLOAT16_INT8_FEATURES_KHR: {
+                auto* f16Features = (VkPhysicalDeviceFloat16Int8FeaturesKHR*)next;
+                f16Features->shaderFloat16 = true;
+                f16Features->shaderInt8 = false;  // FIXME Needs SPIRV-Cross update
+                next = (VkStructureType*)f16Features->pNext;
+                break;
+            }
             case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_VERTEX_ATTRIBUTE_DIVISOR_FEATURES_EXT: {
                 auto* divisorFeatures = (VkPhysicalDeviceVertexAttributeDivisorFeaturesEXT*)next;
                 divisorFeatures->vertexAttributeInstanceRateDivisor = true;

MoltenVK/MoltenVK/Layers/MVKExtensions.def

@@ -44,6 +44,7 @@ MVK_EXTENSION(KHR_push_descriptor, KHR_PUSH_DESCRIPTOR)
 MVK_EXTENSION(KHR_relaxed_block_layout, KHR_RELAXED_BLOCK_LAYOUT)
 MVK_EXTENSION(KHR_sampler_mirror_clamp_to_edge, KHR_SAMPLER_MIRROR_CLAMP_TO_EDGE)
 MVK_EXTENSION(KHR_shader_draw_parameters, KHR_SHADER_DRAW_PARAMETERS)
+MVK_EXTENSION(KHR_shader_float16_int8, KHR_SHADER_FLOAT16_INT8)
 MVK_EXTENSION(KHR_storage_buffer_storage_class, KHR_STORAGE_BUFFER_STORAGE_CLASS)
 MVK_EXTENSION(KHR_surface, KHR_SURFACE)
 MVK_EXTENSION(KHR_swapchain, KHR_SWAPCHAIN)