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https://github.com/FEX-Emu/FEX.git
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96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
/*
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$info$
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tags: thunklibs|Vulkan
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$end_info$
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*/
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#define VK_USE_64_BIT_PTR_DEFINES 0
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#define VK_USE_PLATFORM_XLIB_XRANDR_EXT
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#define VK_USE_PLATFORM_XLIB_KHR
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#define VK_USE_PLATFORM_XCB_KHR
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#define VK_USE_PLATFORM_WAYLAND_KHR
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#include <vulkan/vulkan.h>
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#include "common/Guest.h"
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#include <cstdio>
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#include <dlfcn.h>
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#include <functional>
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#include <string_view>
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#include <unordered_map>
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#include "thunkgen_guest_libvulkan.inl"
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extern "C" {
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// Maps Vulkan API function names to the address of a guest function which is
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// linked to the corresponding host function pointer
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const std::unordered_map<std::string_view, uintptr_t /* guest function address */> HostPtrInvokers = std::invoke([]() {
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#define PAIR(name, unused) Ret[#name] = reinterpret_cast<uintptr_t>(GetCallerForHostFunction(name));
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std::unordered_map<std::string_view, uintptr_t> Ret;
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FOREACH_internal_SYMBOL(PAIR);
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return Ret;
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#undef PAIR
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});
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// This variable controls the behavior of vkGetDevice/InstanceProcAddr for functions we don't know the signature of:
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// - if false (default), we return a nullptr (since the application might have a fallback code path)
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// - if true, we return a stub function that fatally errors upon being called
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constexpr bool stub_unknown_functions = false;
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// Fatally erroring function with a thunk-like interface. This is used as a placeholder for unknown Vulkan functions
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[[noreturn]]
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static void FatalError(void* raw_args) {
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auto called_function = reinterpret_cast<PackedArguments<void, uintptr_t>*>(raw_args)->a0;
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fprintf(stderr, "FATAL: Called unknown Vulkan function at address %p\n", reinterpret_cast<void*>(called_function));
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__builtin_trap();
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}
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static PFN_vkVoidFunction MakeGuestCallable(const char* origin, PFN_vkVoidFunction func, const char* name) {
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auto It = HostPtrInvokers.find(name);
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if (It == HostPtrInvokers.end()) {
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fprintf(stderr, "%s: Unknown Vulkan function at address %p: %s\n", origin, func, name);
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if (stub_unknown_functions) {
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const auto StubHostPtrInvoker = CallHostFunction<FatalError, void>;
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LinkAddressToFunction((uintptr_t)func, reinterpret_cast<uintptr_t>(StubHostPtrInvoker));
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return func;
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}
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return nullptr;
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}
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fprintf(stderr, "Linking address %p to host invoker %#zx\n", func, It->second);
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LinkAddressToFunction((uintptr_t)func, It->second);
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return func;
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}
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PFN_vkVoidFunction vkGetDeviceProcAddr(VkDevice a_0, const char* a_1) {
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auto Ret = fexfn_pack_vkGetDeviceProcAddr(a_0, a_1);
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if (!Ret) {
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return nullptr;
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}
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return MakeGuestCallable(__FUNCTION__, Ret, a_1);
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}
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PFN_vkVoidFunction vkGetInstanceProcAddr(VkInstance a_0, const char* a_1) {
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if (a_1 == std::string_view {"vkGetDeviceProcAddr"}) {
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return (PFN_vkVoidFunction)vkGetDeviceProcAddr;
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} else {
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auto Ret = fexfn_pack_vkGetInstanceProcAddr(a_0, a_1);
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if (!Ret) {
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return nullptr;
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}
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return MakeGuestCallable(__FUNCTION__, Ret, a_1);
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}
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}
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}
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void OnInit() {
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// TODO: Load libX11 on-demand instead
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void* libx11 = dlopen("libX11.so.6", RTLD_LAZY);
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fexfn_pack_SetGuestXSync((uintptr_t)dlsym(libx11, "XSync"), (uintptr_t)CallbackUnpack<decltype(XSync)>::Unpack);
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fexfn_pack_SetGuestXGetVisualInfo((uintptr_t)dlsym(libx11, "XGetVisualInfo"), (uintptr_t)CallbackUnpack<decltype(XGetVisualInfo)>::Unpack);
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fexfn_pack_SetGuestXDisplayString((uintptr_t)dlsym(libx11, "XDisplayString"), (uintptr_t)CallbackUnpack<decltype(XDisplayString)>::Unpack);
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}
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LOAD_LIB_INIT(libvulkan, OnInit)
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