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Refactor output handling

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This commit is contained in:
Isaac Freund 2020-03-23 12:22:48 +01:00
parent f423f5317b
commit 774fcf53a8
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GPG key ID: 86DED400DDFD7A11
2 changed files with 99 additions and 94 deletions
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93
src/output.zig
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@ -4,10 +4,52 @@ const c = @import("c.zig").c;
const Output = struct {
server: *Server,
wlr_output: *c.wlr_output,
frame: c.wl_listener,
listen_frame: c.wl_listener,
pub fn init(server: *Server, wlr_output: *c.wlr_output) !@This() {
// Some backends don't have modes. DRM+KMS does, and we need to set a mode
// before we can use the output. The mode is a tuple of (width, height,
// refresh rate), and each monitor supports only a specific set of modes. We
// just pick the monitor's preferred mode, a more sophisticated compositor
// would let the user configure it.
// if not empty
if (c.wl_list_empty(&wlr_output.*.modes) == 0) {
const mode = c.wlr_output_preferred_mode(wlr_output);
c.wlr_output_set_mode(wlr_output, mode);
c.wlr_output_enable(wlr_output, true);
if (!c.wlr_output_commit(wlr_output)) {
return error.CantCommitWlrOutputMode;
}
}
var output = @This(){
.server = server,
.wlr_output = wlr_output,
.listen_frame = c.wl_listener{
.link = undefined,
.notify = handle_frame,
},
};
fn output_frame(listener: [*c]c.wl_listener, data: ?*c_void) callconv(.C) void {
// Sets up a listener for the frame notify event.
c.wl_signal_add(&wlr_output.*.events.frame, &output.*.listen_frame);
// Add the new output to the layout. The add_auto function arranges outputs
// from left-to-right in the order they appear. A more sophisticated
// compositor would let the user configure the arrangement of outputs in the
// layout.
c.wlr_output_layout_add_auto(server.output_layout, wlr_output);
// Creating the global adds a wl_output global to the display, which Wayland
// clients can see to find out information about the output (such as
// DPI, scale factor, manufacturer, etc).
c.wlr_output_create_global(wlr_output);
return output;
}
fn handle_frame(listener: [*c]c.wl_listener, data: ?*c_void) callconv(.C) void {
// This function is called every time an output is ready to display a frame,
// generally at the output's refresh rate (e.g. 60Hz).
var output = @fieldParentPtr(Output, "frame", listener);
@ -62,49 +104,4 @@ fn output_frame(listener: [*c]c.wl_listener, data: ?*c_void) callconv(.C) void {
// TODO: handle failure
_ = c.wlr_output_commit(output.*.wlr_output);
}
fn server_new_output(listener: [*c]c.wl_listener, data: ?*c_void) callconv(.C) void {
var server = @fieldParentPtr(Server, "new_output", listener);
var wlr_output = @ptrCast(*c.wlr_output, @alignCast(@alignOf(*c.wlr_output), data));
// Some backends don't have modes. DRM+KMS does, and we need to set a mode
// before we can use the output. The mode is a tuple of (width, height,
// refresh rate), and each monitor supports only a specific set of modes. We
// just pick the monitor's preferred mode, a more sophisticated compositor
// would let the user configure it.
// if not empty
if (c.wl_list_empty(&wlr_output.*.modes) == 0) {
var mode = c.wlr_output_preferred_mode(wlr_output);
c.wlr_output_set_mode(wlr_output, mode);
c.wlr_output_enable(wlr_output, true);
if (!c.wlr_output_commit(wlr_output)) {
return;
}
}
// Allocates and configures our state for this output
server.*.outputs.append(Output{
.server = undefined,
.wlr_output = undefined,
.frame = undefined,
}) catch unreachable;
var output = &server.*.outputs.span()[server.*.outputs.span().len - 1];
output.*.wlr_output = wlr_output;
output.*.server = server;
// Sets up a listener for the frame notify event.
output.*.frame.notify = output_frame;
c.wl_signal_add(&wlr_output.*.events.frame, &output.*.frame);
// Adds this to the output layout. The add_auto function arranges outputs
// from left-to-right in the order they appear. A more sophisticated
// compositor would let the user configure the arrangement of outputs in the
// layout.
c.wlr_output_layout_add_auto(server.*.output_layout, wlr_output);
// Creating the global adds a wl_output global to the display, which Wayland
// clients can see to find out information about the output (such as
// DPI, scale factor, manufacturer, etc).
c.wlr_output_create_global(wlr_output);
}
};

10
src/server.zig
View file

@ -69,7 +69,7 @@ pub const Server = struct {
/// Create the socket, set WAYLAND_DISPLAY, and start the backend
pub fn start(self: @This()) !void {
// Add a Unix socket to the Wayland display.
const socket = c.wl_display_add_socket_auto(self.wl_display) orelse;
const socket = c.wl_display_add_socket_auto(self.wl_display) orelse
return error.CantAddSocket;
// Start the backend. This will enumerate outputs and inputs, become the DRM
@ -114,4 +114,12 @@ pub const Server = struct {
}
return true;
}
fn handle_new_output(listener: [*c]c.wl_listener, data: ?*c_void) callconv(.C) void {
var server = @fieldParentPtr(Server, "new_output", listener);
var wlr_output = @ptrCast(*c.wlr_output, @alignCast(@alignOf(*c.wlr_output), data));
// TODO: Handle failure
server.outputs.append(Output.init(server, wlr_output) orelse return);
}
};