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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#pragma once
#include "common/common.h"
#include "common/scm_rev.h"
#include "common/string_util.h"
#include "common/key_map.h"
/**
* Abstraction class used to provide an interface between emulation code and the frontend
* (e.g. SDL, QGLWidget, GLFW, etc...).
*
* Design notes on the interaction between EmuWindow and the emulation core:
* - Generally, decisions on anything visible to the user should be left up to the GUI.
* For example, the emulation core should not try to dictate some window title or size.
* This stuff is not the core's business and only causes problems with regards to thread-safety
* anyway.
* - Under certain circumstances, it may be desirable for the core to politely request the GUI
* to set e.g. a minimum window size. However, the GUI should always be free to ignore any
* such hints.
* - EmuWindow may expose some of its state as read-only to the emulation core, however care
* should be taken to make sure the provided information is self-consistent. This requires
* some sort of synchronization (most of this is still a TODO).
* - DO NOT TREAT THIS CLASS AS A GUI TOOLKIT ABSTRACTION LAYER. That's not what it is. Please
* re-read the upper points again and think about it if you don't see this.
*/
class EmuWindow
{
public:
/// Data structure to store emuwindow configuration
struct WindowConfig {
bool fullscreen;
int res_width;
int res_height;
std::pair<unsigned,unsigned> min_client_area_size;
};
/// Swap buffers to display the next frame
virtual void SwapBuffers() = 0;
/// Polls window events
virtual void PollEvents() = 0;
/// Makes the graphics context current for the caller thread
virtual void MakeCurrent() = 0;
/// Releases (dunno if this is the "right" word) the GLFW context from the caller thread
virtual void DoneCurrent() = 0;
virtual void ReloadSetKeymaps() = 0;
/// Signals a key press action to the HID module
static void KeyPressed(KeyMap::HostDeviceKey key);
/// Signals a key release action to the HID module
static void KeyReleased(KeyMap::HostDeviceKey key);
/**
* Returns currently active configuration.
* @note Accesses to the returned object need not be consistent because it may be modified in another thread
*/
const WindowConfig& GetActiveConfig() const {
return active_config;
}
/**
* Requests the internal configuration to be replaced by the specified argument at some point in the future.
* @note This method is thread-safe, because it delays configuration changes to the GUI event loop. Hence there is no guarantee on when the requested configuration will be active.
*/
void SetConfig(const WindowConfig& val) {
config = val;
}
/**
* Gets the framebuffer size in pixels.
* @note This method is thread-safe
*/
const std::pair<unsigned,unsigned> GetFramebufferSize() const {
return framebuffer_size;
}
/**
* Gets window client area width in logical coordinates.
* @note For high-DPI systems, this is smaller than the framebuffer size.
* @note This method is thread-safe
*/
std::pair<unsigned,unsigned> GetClientAreaSize() const {
return std::make_pair(client_area_width, client_area_height);
}
protected:
EmuWindow()
{
// TODO: Find a better place to set this.
config.min_client_area_size = std::make_pair(400u, 480u);
active_config = config;
}
virtual ~EmuWindow() {}
/**
* Processes any pending configuration changes from the last SetConfig call.
* This method invokes OnMinimalClientAreaChangeRequest if the corresponding configuration
* field changed.
* @note Implementations will usually want to call this from the GUI thread.
* @todo Actually call this in existing implementations.
*/
void ProcessConfigurationChanges() {
// TODO: For proper thread safety, we should eventually implement a proper
// multiple-writer/single-reader queue...
if (config.min_client_area_size != active_config.min_client_area_size) {
OnMinimalClientAreaChangeRequest(config.min_client_area_size);
config.min_client_area_size = active_config.min_client_area_size;
}
}
/**
* Update internal framebuffer size with the given parameter.
* @note EmuWindow implementations will usually use this in window resize event handlers.
*/
void NotifyFramebufferSizeChanged(const std::pair<unsigned,unsigned>& size) {
framebuffer_size = size;
}
/**
* Update internal client area size with the given parameter.
* @note EmuWindow implementations will usually use this in window resize event handlers.
*/
void NotifyClientAreaSizeChanged(const std::pair<unsigned,unsigned>& size) {
client_area_width = size.first;
client_area_height = size.second;
}
private:
/**
* Handler called when the minimal client area was requested to be changed via SetConfig.
* For the request to be honored, EmuWindow implementations will usually reimplement this function.
*/
virtual void OnMinimalClientAreaChangeRequest(const std::pair<unsigned,unsigned>& minimal_size) {
// By default, ignore this request and do nothing.
}
std::pair<unsigned,unsigned> framebuffer_size;
unsigned client_area_width; ///< Current client width, should be set by window impl.
unsigned client_area_height; ///< Current client height, should be set by window impl.
WindowConfig config; ///< Internal configuration (changes pending for being applied in ProcessConfigurationChanges)
WindowConfig active_config; ///< Internal active configuration
};
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