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WindowServer: Add initial support for rendering on multiple screens

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This allows WindowServer to use multiple framebuffer devices and
compose the desktop with any arbitrary layout. Currently, it is assumed
that it is configured contiguous and non-overlapping, but this should
eventually be enforced.

To make rendering efficient, each window now also tracks on which
screens it needs to be rendered. This way we don't have to iterate all
the windows for each screen but instead use the same rendering loop and
then only render to the screen (or screens) that the window actually
uses.
This commit is contained in:
Tom 2021-06-13 06:16:06 -06:00 • committed by Andreas Kling
parent 499c33ae0c
commit 4392da970a
42 changed files with 1127 additions and 563 deletions
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45
Userland/Services/WindowServer/main.cpp
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@ -75,10 +75,47 @@ int main(int, char**)
return 1;
}
int scale = wm_config->read_num_entry("Screen", "ScaleFactor", 1);
WindowServer::Screen screen(wm_config->read_num_entry("Screen", "Width", 1024 / scale), wm_config->read_num_entry("Screen", "Height", 768 / scale), scale);
screen.set_acceleration_factor(atof(wm_config->read_entry("Mouse", "AccelerationFactor", "1.0").characters()));
screen.set_scroll_step_size(wm_config->read_num_entry("Mouse", "ScrollStepSize", 4));
// First check which screens are explicitly configured
AK::HashTable<String> fb_devices_configured;
int main_screen_index = wm_config->read_num_entry("Screens", "MainScreen", 0);
for (int screen_index = 0;; screen_index++) {
auto group_name = String::formatted("Screen{}", screen_index);
if (!wm_config->has_group(group_name))
break;
int scale = wm_config->read_num_entry(group_name, "ScaleFactor", 1);
auto device_path = wm_config->read_entry(group_name, "Device", {});
if (device_path.is_null() || device_path.is_empty()) {
dbgln("Screen {} misses Device setting", screen_index);
break;
}
Gfx::IntRect virtual_rect {
wm_config->read_num_entry(group_name, "Left", 0 / scale),
wm_config->read_num_entry(group_name, "Top", 0 / scale),
wm_config->read_num_entry(group_name, "Width", 1024 / scale),
wm_config->read_num_entry("Screen", "Height", 768 / scale)
};
auto* screen = WindowServer::Screen::create(device_path, virtual_rect, scale);
if (!screen) {
dbgln("Screen {} failed to be created", screen_index);
break;
}
if (main_screen_index == screen_index)
screen->make_main_screen();
// Remember that we used this device for a screen already
fb_devices_configured.set(device_path);
}
// TODO: Enumerate the /dev/fbX devices and set up any ones we find that we haven't already used
auto& screen_input = WindowServer::ScreenInput::the();
screen_input.set_cursor_location(WindowServer::Screen::main().rect().center());
screen_input.set_acceleration_factor(atof(wm_config->read_entry("Mouse", "AccelerationFactor", "1.0").characters()));
screen_input.set_scroll_step_size(wm_config->read_num_entry("Mouse", "ScrollStepSize", 4));
WindowServer::Compositor::the();
auto wm = WindowServer::WindowManager::construct(*palette);
auto am = WindowServer::AppletManager::construct();