| /* |
| * Copyright 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* NOTE: |
| * This stub HAL is only used internally by the loader when a real HAL |
| * implementation is not present, in order to avoid needing "null HAL" checks |
| * throughout the loader. It does not enumerate any physical devices, and is |
| * only as conformant to the Vulkan and Android HAL interfaces as the loader |
| * needs it to be. Do not use it as an example of a correct implementation; the |
| * code in ../null_driver is better for that. |
| */ |
| |
| #undef LOG_TAG |
| #define LOG_TAG "vkstub" |
| |
| #include <array> |
| #include <bitset> |
| #include <mutex> |
| |
| #include <log/log.h> |
| #include <hardware/hwvulkan.h> |
| |
| #include "stubhal.h" |
| |
| namespace vulkan { |
| namespace stubhal { |
| |
| namespace { |
| |
| const size_t kMaxInstances = 32; |
| static std::mutex g_instance_mutex; |
| static std::bitset<kMaxInstances> g_instance_used(false); |
| static std::array<hwvulkan_dispatch_t, kMaxInstances> g_instances; |
| |
| [[noreturn]] VKAPI_ATTR void NoOp() { |
| LOG_ALWAYS_FATAL("invalid stub function called"); |
| } |
| |
| VKAPI_ATTR VkResult |
| EnumerateInstanceExtensionProperties(const char* /*layer_name*/, |
| uint32_t* count, |
| VkExtensionProperties* /*properties*/) { |
| *count = 0; |
| return VK_SUCCESS; |
| } |
| |
| VKAPI_ATTR VkResult |
| EnumerateInstanceLayerProperties(uint32_t* count, |
| VkLayerProperties* /*properties*/) { |
| *count = 0; |
| return VK_SUCCESS; |
| } |
| |
| VKAPI_ATTR VkResult CreateInstance(const VkInstanceCreateInfo* /*create_info*/, |
| const VkAllocationCallbacks* /*allocator*/, |
| VkInstance* instance) { |
| std::lock_guard<std::mutex> lock(g_instance_mutex); |
| for (size_t i = 0; i < kMaxInstances; i++) { |
| if (!g_instance_used[i]) { |
| g_instance_used[i] = true; |
| g_instances[i].magic = HWVULKAN_DISPATCH_MAGIC; |
| *instance = reinterpret_cast<VkInstance>(&g_instances[i]); |
| return VK_SUCCESS; |
| } |
| } |
| ALOGE("no more instances available (max=%zu)", kMaxInstances); |
| return VK_ERROR_INITIALIZATION_FAILED; |
| } |
| |
| VKAPI_ATTR void DestroyInstance(VkInstance instance, |
| const VkAllocationCallbacks* /*allocator*/) { |
| std::lock_guard<std::mutex> lock(g_instance_mutex); |
| ssize_t idx = |
| reinterpret_cast<hwvulkan_dispatch_t*>(instance) - &g_instances[0]; |
| ALOG_ASSERT(idx >= 0 && static_cast<size_t>(idx) < g_instance_used.size(), |
| "DestroyInstance: invalid instance handle"); |
| g_instance_used[static_cast<size_t>(idx)] = false; |
| } |
| |
| VKAPI_ATTR VkResult EnumeratePhysicalDevices(VkInstance /*instance*/, |
| uint32_t* count, |
| VkPhysicalDevice* /*gpus*/) { |
| *count = 0; |
| return VK_SUCCESS; |
| } |
| |
| VKAPI_ATTR PFN_vkVoidFunction GetInstanceProcAddr(VkInstance /*instance*/, |
| const char* name) { |
| if (strcmp(name, "vkCreateInstance") == 0) |
| return reinterpret_cast<PFN_vkVoidFunction>(CreateInstance); |
| if (strcmp(name, "vkDestroyInstance") == 0) |
| return reinterpret_cast<PFN_vkVoidFunction>(DestroyInstance); |
| if (strcmp(name, "vkEnumerateInstanceExtensionProperties") == 0) |
| return reinterpret_cast<PFN_vkVoidFunction>( |
| EnumerateInstanceExtensionProperties); |
| if (strcmp(name, "vkEnumeratePhysicalDevices") == 0) |
| return reinterpret_cast<PFN_vkVoidFunction>(EnumeratePhysicalDevices); |
| if (strcmp(name, "vkGetInstanceProcAddr") == 0) |
| return reinterpret_cast<PFN_vkVoidFunction>(GetInstanceProcAddr); |
| |
| // None of the other Vulkan functions should ever be called, as they all |
| // take a VkPhysicalDevice or other object obtained from a physical device. |
| return reinterpret_cast<PFN_vkVoidFunction>(NoOp); |
| } |
| |
| } // anonymous namespace |
| |
| const hwvulkan_device_t kDevice = { |
| .common = |
| { |
| .tag = HARDWARE_DEVICE_TAG, |
| .version = HWVULKAN_DEVICE_API_VERSION_0_1, |
| .module = nullptr, |
| .close = nullptr, |
| }, |
| .EnumerateInstanceExtensionProperties = |
| EnumerateInstanceExtensionProperties, |
| .CreateInstance = CreateInstance, |
| .GetInstanceProcAddr = GetInstanceProcAddr, |
| }; |
| |
| } // namespace stubhal |
| } // namespace vulkan |