mirror of
https://github.com/FEX-Emu/FEX.git
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274 lines
11 KiB
C++
274 lines
11 KiB
C++
/*
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$info$
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tags: thunklibs|wayland-client
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$end_info$
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*/
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#include <wayland-util.h>
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#include <wayland-client.h>
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// These must be re-declared with an initializer here, since they don't get exported otherwise
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// NOTE: The initializers for these must be fetched from the host Wayland library, however
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// we can't control how these symbols are loaded since they are global const objects.
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// LD puts them in the application rodata section and ignores any nontrivial library-provided
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// initializers. There is a workaround to enable late initialization anyway in OnInit.
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// NOTE: We only need to do this for interfaces exported by libwayland-client itself. Interfaces
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// defined by external libraries work fine.
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extern "C" const wl_interface wl_output_interface {};
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extern "C" const wl_interface wl_shm_pool_interface {};
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extern "C" const wl_interface wl_pointer_interface {};
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extern "C" const wl_interface wl_compositor_interface {};
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extern "C" const wl_interface wl_shm_interface {};
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extern "C" const wl_interface wl_registry_interface {};
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extern "C" const wl_interface wl_buffer_interface {};
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extern "C" const wl_interface wl_seat_interface {};
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extern "C" const wl_interface wl_surface_interface {};
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extern "C" const wl_interface wl_keyboard_interface {};
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extern "C" const wl_interface wl_callback_interface {};
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#include <array>
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#include <charconv>
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#include <cstdio>
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#include <cstdarg>
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#include <cstring>
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#include <string>
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#include <unordered_map>
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#include "common/Guest.h"
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#include "thunkgen_guest_libwayland-client.inl"
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struct wl_proxy_private {
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wl_interface* interface;
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// Other data members omitted
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};
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template<char> struct ArgType;
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template<> struct ArgType<'s'> { using type = const char*; };
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template<> struct ArgType<'u'> { using type = uint32_t; };
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template<> struct ArgType<'i'> { using type = int32_t; };
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template<> struct ArgType<'o'> { using type = wl_proxy*; };
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template<> struct ArgType<'a'> { using type = wl_array*; };
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template<> struct ArgType<'f'> { using type = wl_fixed_t; };
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template<> struct ArgType<'h'> { using type = int32_t; }; // fd?
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template<char... Signature>
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static void* WaylandAllocateHostTrampolineForGuestListener(void (*callback)()) {
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using cb = void(void*, wl_proxy*, typename ArgType<Signature>::type...);
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return (void*)AllocateHostTrampolineForGuestFunction((cb*)callback);
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}
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#define WL_CLOSURE_MAX_ARGS 20
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// Per-proxy list of callbacks set up via wl_proxy_add_listener.
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// These tables store the host-callable trampolines to the actual listener
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// callbacks provided by the guest application.
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// NOTE: There can only be one listener per proxy. Wayland will return an error
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// if wl_proxy_add_listener is called twice.
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// NOTE: Entries should be removed in wl_destroy_proxy. Since proxy wrappers do
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// not use their own listeners, wl_proxy_wrapper_destroy does not need to
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// be customized.
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static std::unordered_map<wl_proxy*, std::array<void*, WL_CLOSURE_MAX_ARGS>> proxy_listeners;
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extern "C" int wl_proxy_add_listener(wl_proxy *proxy,
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void (**callback)(void), void *data) {
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auto interface = ((wl_proxy_private*)proxy)->interface;
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// NOTE: This table must remain valid past the return of this function.
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auto& host_callbacks = proxy_listeners[proxy];
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for (int i = 0; i < ((wl_proxy_private*)proxy)->interface->event_count; ++i) {
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auto signature = std::string_view { interface->events[i].signature };
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// A leading number indicates the minimum protocol version
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uint32_t since_version = 0;
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auto [ptr, res] = std::from_chars(signature.begin(), signature.end(), since_version, 10);
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signature = signature.substr(ptr - signature.begin());
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if (signature == "u") {
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// E.g. wl_registry::global_remove
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u'>(callback[i]);
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} else if (signature == "usu") {
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// E.g. wl_registry::global
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 's', 'u'>(callback[i]);
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} else if (signature == "s") {
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// E.g. wl_seat::name
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'s'>(callback[i]);
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} else if (signature == "") {
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// E.g. xdg_toplevel::close
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<>(callback[i]);
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} else if (signature == "ii") {
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// E.g. xdg_toplevel::configure_bounds
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'i', 'i'>(callback[i]);
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} else if (signature == "iia") {
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// E.g. xdg_toplevel::configure
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'i', 'i', 'a'>(callback[i]);
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} else if (signature == "a") {
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// E.g. xdg_toplevel::wm_capabilities
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'a'>(callback[i]);
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} else if (signature == "uoff") {
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// E.g. wl_pointer_listener::enter
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'o', 'f', 'f'>(callback[i]);
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} else if (signature == "uo") {
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// E.g. wl_pointer_listener::leave
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'o'>(callback[i]);
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} else if (signature == "uff") {
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// E.g. wl_pointer_listener::motion
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'f', 'f'>(callback[i]);
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} else if (signature == "uuuu") {
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// E.g. wl_pointer_listener::button
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'u', 'u', 'u'>(callback[i]);
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} else if (signature == "uuf") {
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// E.g. wl_pointer_listener::axis
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'u', 'f'>(callback[i]);
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} else if (signature == "uu") {
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// E.g. wl_pointer_listener::axis_stop
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'u'>(callback[i]);
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} else if (signature == "ui") {
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// E.g. wl_pointer_listener::axis_discrete
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'i'>(callback[i]);
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} else if (signature == "uhu") {
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// E.g. wl_keyboard_listener::keymap
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'h', 'u'>(callback[i]);
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} else if (signature == "uoa") {
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// E.g. wl_keyboard_listener::enter
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'o', 'a'>(callback[i]);
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} else if (signature == "uuuuu") {
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// E.g. wl_keyboard_listener::modifiers
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host_callbacks[i] = WaylandAllocateHostTrampolineForGuestListener<'u', 'u', 'u', 'u', 'u'>(callback[i]);
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} else {
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fprintf(stderr, "Unknown wayland event signature descriptor %s\n", signature.data());
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std::abort();
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}
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}
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return fexfn_pack_wl_proxy_add_listener(proxy, (void(**)())host_callbacks.data(), data);
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}
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extern "C" void wl_proxy_destroy(struct wl_proxy *proxy) {
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proxy_listeners.erase(proxy);
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return fexfn_pack_wl_proxy_destroy(proxy);
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}
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// Adapted from the Wayland sources
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static const char* get_next_argument_type(const char *signature, char &type)
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{
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for (; *signature; ++signature) {
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switch(*signature) {
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case 'i':
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case 'u':
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case 'f':
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case 's':
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case 'o':
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case 'n':
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case 'a':
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case 'h':
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type = *signature;
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return signature + 1;
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default:
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continue;
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}
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}
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type = 0;
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return signature;
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}
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static void wl_argument_from_va_list(const char *signature, wl_argument *args,
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int count, va_list ap) {
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auto sig_iter = signature;
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for (int i = 0; i < count; i++) {
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char arg_type;
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sig_iter = get_next_argument_type(sig_iter, arg_type);
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switch (arg_type) {
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case 'i':
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args[i].i = va_arg(ap, int32_t);
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break;
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case 'u':
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args[i].u = va_arg(ap, uint32_t);
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break;
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case 'f':
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args[i].f = va_arg(ap, wl_fixed_t);
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break;
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case 's':
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args[i].s = va_arg(ap, const char *);
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break;
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case 'o':
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args[i].o = va_arg(ap, struct wl_object *);
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break;
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case 'n':
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args[i].o = va_arg(ap, struct wl_object *);
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break;
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case 'a':
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args[i].a = va_arg(ap, struct wl_array *);
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break;
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case 'h':
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args[i].h = va_arg(ap, int32_t);
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break;
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case '\0':
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return;
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}
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}
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}
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extern "C" void wl_proxy_marshal(wl_proxy *proxy, uint32_t opcode, ...) {
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wl_argument args[WL_CLOSURE_MAX_ARGS];
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va_list ap;
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va_start(ap, opcode);
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#ifdef IS_32BIT_THUNK
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// Must extract signature from host due to different data layout on 32-bit
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#error Not implemented
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#else
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wl_argument_from_va_list(((wl_proxy_private*)proxy)->interface->methods[opcode].signature,
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args, WL_CLOSURE_MAX_ARGS, ap);
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#endif
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va_end(ap);
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wl_proxy_marshal_array(proxy, opcode, args);
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}
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extern "C" wl_proxy *wl_proxy_marshal_flags(wl_proxy *proxy, uint32_t opcode,
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const wl_interface *interface,
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uint32_t version,
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uint32_t flags, ...) {
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wl_argument args[WL_CLOSURE_MAX_ARGS];
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va_list ap;
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va_start(ap, flags);
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#ifdef IS_32BIT_THUNK
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// Must extract signature from host due to different data layout on 32-bit
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#error Not implemented
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#else
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wl_argument_from_va_list(((wl_proxy_private*)proxy)->interface->methods[opcode].signature,
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args, WL_CLOSURE_MAX_ARGS, ap);
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#endif
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va_end(ap);
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// wl_proxy_marshal_array_flags is only available starting from Wayland 1.19.91
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#if WAYLAND_VERSION_MAJOR * 10000 + WAYLAND_VERSION_MINOR * 100 + WAYLAND_VERSION_MICRO >= 11991
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return wl_proxy_marshal_array_flags(proxy, opcode, interface, version, flags, args);
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#else
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fprintf(stderr, "Host Wayland version is too old to support FEX thunking\n");
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__builtin_trap();
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#endif
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}
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void OnInit() {
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_output_interface), "wl_output");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_shm_pool_interface), "wl_shm_pool");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_pointer_interface), "wl_pointer");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_compositor_interface), "wl_compositor");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_shm_interface), "wl_shm");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_registry_interface), "wl_registry");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_buffer_interface), "wl_buffer");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_seat_interface), "wl_seat");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_surface_interface), "wl_surface");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_keyboard_interface), "wl_keyboard");
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fex_wl_exchange_interface_pointer(const_cast<wl_interface*>(&wl_callback_interface), "wl_callback");
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}
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LOAD_LIB_INIT(libwayland-client, OnInit)
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