diff options
author | Benjamin Barenblat <bbarenblat@gmail.com> | 2022-01-17 23:12:32 -0500 |
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committer | Benjamin Barenblat <bbarenblat@gmail.com> | 2022-01-30 15:55:27 -0500 |
commit | d0e18bdb7924c71cdca8dd983711171d87ef28be (patch) | |
tree | 6be11aae0b7c8874e6507b75b4ef26d1353952c7 /src/x/event.h |
glplanet draws Earth like it currently appears from space, putting
nighttime areas in shadow and daytime areas in light. It’s modeled
after Xplanet (http://xplanet.sourceforge.net/), but whereas Xplanet is
entirely a CPU-resident program, glplanet draws using OpenGL. It’s thus
much less resource-intensive, particularly when using high-resolution
textures.
Diffstat (limited to 'src/x/event.h')
-rw-r--r-- | src/x/event.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/x/event.h b/src/x/event.h new file mode 100644 index 0000000..8b9dd24 --- /dev/null +++ b/src/x/event.h @@ -0,0 +1,137 @@ +// Copyright 2021, 2022 Benjamin Barenblat +// +// 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 +// +// https://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. + +// X events. + +#ifndef GLPLANET_SRC_X_EVENT_H_ +#define GLPLANET_SRC_X_EVENT_H_ + +#include <string.h> +#include <xcb/xcb.h> + +#include <array> + +#include "src/x/types.h" +#include "third_party/abseil/absl/types/variant.h" + +namespace x_internal { + +template <typename From, typename To> +void XcbDowncast(const From& from, To& to) noexcept { + static_assert(sizeof(From) >= sizeof(To)); + memcpy(&to, &from, sizeof(To)); +} + +} // namespace x_internal + +namespace x { + +class ExposeEvent final { + public: + explicit ExposeEvent(const xcb_expose_event_t& event) noexcept + : event_(event) {} + explicit ExposeEvent(const xcb_generic_event_t& event) noexcept { + x_internal::XcbDowncast(event, event_); + } + + ExposeEvent(const ExposeEvent&) noexcept = default; + ExposeEvent& operator=(const ExposeEvent&) noexcept = default; + ExposeEvent(ExposeEvent&&) noexcept = default; + ExposeEvent& operator=(ExposeEvent&&) noexcept = default; + + xcb_expose_event_t& AsXcbEvent() noexcept { return event_; } + const xcb_expose_event_t& AsXcbEvent() const noexcept { return event_; } + + private: + xcb_expose_event_t event_; +}; + +class ConfigureNotifyEvent final { + public: + explicit ConfigureNotifyEvent( + const xcb_configure_notify_event_t& event) noexcept + : event_(event) {} + explicit ConfigureNotifyEvent(const xcb_generic_event_t& event) noexcept { + x_internal::XcbDowncast(event, event_); + } + + ConfigureNotifyEvent(const ConfigureNotifyEvent&) noexcept = default; + ConfigureNotifyEvent& operator=(const ConfigureNotifyEvent&) noexcept = + default; + ConfigureNotifyEvent(ConfigureNotifyEvent&&) noexcept = default; + ConfigureNotifyEvent& operator=(ConfigureNotifyEvent&&) noexcept = default; + + int width() const noexcept { return event_.width; } + int height() const noexcept { return event_.height; } + + xcb_configure_notify_event_t& AsXcbEvent() noexcept { return event_; } + const xcb_configure_notify_event_t& AsXcbEvent() const noexcept { + return event_; + } + + private: + xcb_configure_notify_event_t event_; +}; + +class ClientMessageEvent final { + public: + explicit ClientMessageEvent(const xcb_client_message_event_t& event) noexcept + : event_(event) {} + explicit ClientMessageEvent(const xcb_generic_event_t& event) noexcept { + x_internal::XcbDowncast(event, event_); + } + + ClientMessageEvent(const ClientMessageEvent&) noexcept = default; + ClientMessageEvent& operator=(const ClientMessageEvent&) noexcept = default; + ClientMessageEvent(ClientMessageEvent&&) noexcept = default; + ClientMessageEvent& operator=(ClientMessageEvent&&) noexcept = default; + + Id type() const noexcept { return event_.type; } + + xcb_client_message_event_t& AsXcbEvent() noexcept { return event_; } + const xcb_client_message_event_t& AsXcbEvent() const noexcept { + return event_; + } + + private: + xcb_client_message_event_t event_; +}; + +// An X event that doesn't fit into any of the previous classes. +class UnknownEvent final { + public: + explicit UnknownEvent(const xcb_generic_event_t& event) : event_(event) {} + + UnknownEvent(const UnknownEvent&) noexcept = default; + UnknownEvent& operator=(const UnknownEvent&) noexcept = default; + UnknownEvent(UnknownEvent&&) noexcept = default; + UnknownEvent& operator=(UnknownEvent&&) noexcept = default; + + xcb_generic_event_t& AsXcbEvent() noexcept { return event_; } + const xcb_generic_event_t& AsXcbEvent() const noexcept { return event_; } + + private: + xcb_generic_event_t event_; +}; + +using Event = absl::variant<UnknownEvent, ExposeEvent, ConfigureNotifyEvent, + ClientMessageEvent>; + +Event FromXcbGenericEvent(const xcb_generic_event_t&) noexcept; + +std::array<char, 32> SerializeEvent(const Event&) noexcept; + +} // namespace x + +#endif // GLPLANET_SRC_X_EVENT_H_ |