1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
|
// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <memory>
#include <tuple>
#include <utility>
#include "common/common_types.h"
#include "core/frontend/framebuffer_layout.h"
namespace Core::Frontend {
struct Frame;
/**
* For smooth Vsync rendering, we want to always present the latest frame that the core generates,
* but also make sure that rendering happens at the pace that the frontend dictates. This is a
* helper class that the renderer can define to sync frames between the render thread and the
* presentation thread
*/
class TextureMailbox {
public:
virtual ~TextureMailbox() = default;
/**
* Recreate the render objects attached to this frame with the new specified width/height
*/
virtual void ReloadRenderFrame(Frontend::Frame* frame, u32 width, u32 height) = 0;
/**
* Recreate the presentation objects attached to this frame with the new specified width/height
*/
virtual void ReloadPresentFrame(Frontend::Frame* frame, u32 width, u32 height) = 0;
/**
* Render thread calls this to get an available frame to present
*/
virtual Frontend::Frame* GetRenderFrame() = 0;
/**
* Render thread calls this after draw commands are done to add to the presentation mailbox
*/
virtual void ReleaseRenderFrame(Frame* frame) = 0;
/**
* Presentation thread calls this to get the latest frame available to present. If there is no
* frame available after timeout, returns the previous frame. If there is no previous frame it
* returns nullptr
*/
virtual Frontend::Frame* TryGetPresentFrame(int timeout_ms) = 0;
};
/**
* Represents a graphics context that can be used for background computation or drawing. If the
* graphics backend doesn't require the context, then the implementation of these methods can be
* stubs
*/
class GraphicsContext {
public:
virtual ~GraphicsContext();
/// Makes the graphics context current for the caller thread
virtual void MakeCurrent() = 0;
/// Releases (dunno if this is the "right" word) the context from the caller thread
virtual void DoneCurrent() = 0;
};
/**
* 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 GraphicsContext {
public:
/// Data structure to store emuwindow configuration
struct WindowConfig {
bool fullscreen = false;
int res_width = 0;
int res_height = 0;
std::pair<unsigned, unsigned> min_client_area_size;
};
/// Polls window events
virtual void PollEvents() = 0;
/**
* Returns a GraphicsContext that the frontend provides that is shared with the emu window. This
* context can be used from other threads for background graphics computation. If the frontend
* is using a graphics backend that doesn't need anything specific to run on a different thread,
* then it can use a stubbed implemenation for GraphicsContext.
*
* If the return value is null, then the core should assume that the frontend cannot provide a
* Shared Context
*/
virtual std::unique_ptr<GraphicsContext> CreateSharedContext() const {
return nullptr;
}
/// Returns if window is shown (not minimized)
virtual bool IsShown() const = 0;
/// Retrieves Vulkan specific handlers from the window
virtual void RetrieveVulkanHandlers(void* get_instance_proc_addr, void* instance,
void* surface) const = 0;
/**
* Signal that a touch pressed event has occurred (e.g. mouse click pressed)
* @param framebuffer_x Framebuffer x-coordinate that was pressed
* @param framebuffer_y Framebuffer y-coordinate that was pressed
*/
void TouchPressed(unsigned framebuffer_x, unsigned framebuffer_y);
/// Signal that a touch released event has occurred (e.g. mouse click released)
void TouchReleased();
/**
* Signal that a touch movement event has occurred (e.g. mouse was moved over the emu window)
* @param framebuffer_x Framebuffer x-coordinate
* @param framebuffer_y Framebuffer y-coordinate
*/
void TouchMoved(unsigned framebuffer_x, unsigned framebuffer_y);
/**
* 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 layout (width, height, and screen regions)
* @note This method is thread-safe
*/
const Layout::FramebufferLayout& GetFramebufferLayout() const {
return framebuffer_layout;
}
/**
* Convenience method to update the current frame layout
* Read from the current settings to determine which layout to use.
*/
void UpdateCurrentFramebufferLayout(unsigned width, unsigned height);
std::unique_ptr<TextureMailbox> mailbox;
protected:
EmuWindow();
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 framebuffer layout with the given parameter.
* @note EmuWindow implementations will usually use this in window resize event handlers.
*/
void NotifyFramebufferLayoutChanged(const Layout::FramebufferLayout& layout) {
framebuffer_layout = layout;
}
/**
* 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(std::pair<unsigned, unsigned>) {
// By default, ignore this request and do nothing.
}
Layout::FramebufferLayout framebuffer_layout; ///< Current framebuffer layout
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
class TouchState;
std::shared_ptr<TouchState> touch_state;
/**
* Clip the provided coordinates to be inside the touchscreen area.
*/
std::tuple<unsigned, unsigned> ClipToTouchScreen(unsigned new_x, unsigned new_y) const;
};
} // namespace Core::Frontend
|
