Disable new control flow extensions for non-Apple GPUs

Author: squidbus

MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm

@@ -552,7 +552,7 @@
 			}
 			case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_MAXIMAL_RECONVERGENCE_FEATURES_KHR: {
 				auto* shaderReconvergenceFeatures = (VkPhysicalDeviceShaderMaximalReconvergenceFeaturesKHR*)next;
-				shaderReconvergenceFeatures->shaderMaximalReconvergence = true;
+				shaderReconvergenceFeatures->shaderMaximalReconvergence = _gpuCapabilities.isAppleGPU;
 				break;
 			}
 			case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_RELAXED_EXTENDED_INSTRUCTION_FEATURES_KHR: {
@@ -568,7 +568,7 @@
 			}
 			case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_SUBGROUP_UNIFORM_CONTROL_FLOW_FEATURES_KHR: {
 				auto* shaderSGUniformFeatures = (VkPhysicalDeviceShaderSubgroupUniformControlFlowFeaturesKHR*)next;
-				shaderSGUniformFeatures->shaderSubgroupUniformControlFlow = true;
+				shaderSGUniformFeatures->shaderSubgroupUniformControlFlow = _gpuCapabilities.isAppleGPU;
 				break;
 			}
 			case VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_4444_FORMATS_FEATURES_EXT: {
@@ -3667,6 +3667,10 @@ static uint32_t mvkGetEntryProperty(io_registry_entry_t entry, CFStringRef prope
 	MVKExtensionList* pWritableExtns = (MVKExtensionList*)&_supportedExtensions;
 	pWritableExtns->disableAllButEnabledDeviceExtensions();
 
+	if (!_gpuCapabilities.isAppleGPU) {
+		pWritableExtns->vk_KHR_shader_subgroup_uniform_control_flow.enabled = false;
+		pWritableExtns->vk_KHR_shader_maximal_reconvergence.enabled = false;
+	}
 	if (!_metalFeatures.samplerMirrorClampToEdge) {
 		pWritableExtns->vk_KHR_sampler_mirror_clamp_to_edge.enabled = false;
 	}