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68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#define GLAD_VULKAN_IMPLEMENTATION
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#include <vulkan/vulkan.h>
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#include <RHI.Loader/Glad/GladFunctionLoader.h>
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#include <AzCore/Module/DynamicModuleHandle.h>
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namespace
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{
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GLADapiproc LoadFunctionFromLibrary(void* userPtr, const char *name)
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{
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AZ::DynamicModuleHandle* moduleHandle = reinterpret_cast<AZ::DynamicModuleHandle*>(userPtr);
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AZ_Assert(moduleHandle, "Invalid module handle");
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return moduleHandle->GetFunction<GLADapiproc>(name);
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}
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}
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namespace AZ
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{
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namespace Vulkan
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{
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AZStd::unique_ptr<FunctionLoader> FunctionLoader::Create()
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{
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return AZStd::make_unique<GladFunctionLoader>();
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}
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bool GladFunctionLoader::InitInternal()
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{
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// Since que don't have the vulkan instance or device yet, we just load the function pointers from the loader
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// using dlsym or similar.
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return gladLoadVulkanUserPtr(VK_NULL_HANDLE, &LoadFunctionFromLibrary, m_moduleHandle.get()) != 0;
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}
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void GladFunctionLoader::ShutdownInternal()
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{
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gladLoaderUnloadVulkan();
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}
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bool GladFunctionLoader::LoadProcAddresses(VkInstance instance, VkPhysicalDevice physicalDevice, VkDevice device)
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{
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int gladResult = 0;
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if (m_device == VK_NULL_HANDLE || m_device == device)
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{
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// Now that we have the instance and device we can get the function pointer directly from the ICD without going trough the loader's trampoline.
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// Basically we use vkGetInstanceProcAddr and vkGetDeviceProcAddr to get the function address.
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gladResult = gladLoaderLoadVulkan(instance, physicalDevice, device);
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m_device = device;
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}
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else
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{
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// [ATOM-338] Find a better way to handle loading function pointers for multiple devices.
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// Currently we just fallback to using the loader, and let it handle the multi device situation.
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// Unfortunately this add the overhead of the trampoline/terminator when calling any vulkan function.
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gladResult = gladLoadVulkanUserPtr(physicalDevice, &LoadFunctionFromLibrary, m_moduleHandle.get());
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}
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return gladResult != 0;
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}
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} // namespace Vulkan
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} // namespace AZ
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