67 lines
2.5 KiB
Zig
67 lines
2.5 KiB
Zig
//! system/services/display-demo — a hardware-free client of the display service, the
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//! `input-source` analog for the compositor. It creates a wallpaper, a rectangle it moves
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//! each frame, and a small cursor, then drives the compositor in a present loop — proof
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//! that a *separate process* can compose a moving scene through the display service over
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//! IPC, exercising the layer client API and damage-driven present end to end
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//! (docs/display.md). It logs `display-demo: ok` once it has driven a run of frames.
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const runtime = @import("runtime");
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const display = runtime.display;
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const system = runtime.system;
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const time = runtime.time;
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pub fn main() void {
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const mode = display.info() orelse {
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_ = system.write("display-demo: no display service\n");
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return;
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};
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// A full-screen wallpaper under everything.
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const wallpaper = display.createLayer(0, 0, mode.width, mode.height, 0) orelse return createFailed();
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_ = wallpaper.fill(0, 0, mode.width, mode.height, display.color(0x10, 0x18, 0x28));
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// A rectangle that slides back and forth.
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const box_w: u32 = 140;
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const box_h: u32 = 100;
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const box_y: i32 = 200;
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const box = display.createLayer(0, box_y, box_w, box_h, 1) orelse return createFailed();
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_ = box.fill(0, 0, box_w, box_h, display.color(0xE0, 0x60, 0x40));
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// A little cursor on top.
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const cursor = display.createLayer(40, 40, 12, 12, 2) orelse return createFailed();
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_ = cursor.fill(0, 0, 12, 12, display.color(0xF0, 0xF0, 0xF0));
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_ = display.present();
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_ = system.write("display-demo: scene up; animating\n");
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const span: i32 = @as(i32, @intCast(mode.width)) - @as(i32, @intCast(box_w));
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var x: i32 = 0;
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var dx: i32 = 8;
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var frame: u32 = 0;
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while (true) : (frame += 1) {
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x += dx;
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if (x <= 0) {
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x = 0;
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dx = -dx;
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} else if (x >= span) {
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x = span;
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dx = -dx;
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}
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_ = box.configure(x, box_y, 1, true); // move it; the compositor repaints old + new
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_ = display.present();
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// A run of frames drawn through the compositor is the automated proof (the visible
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// motion is a screenshot away via `zig build run-x86-64`).
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if (frame == 20) _ = system.write("display-demo: ok\n");
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time.sleep(time.Duration.fromMillis(30));
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}
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}
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fn createFailed() void {
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_ = system.write("display-demo: create failed\n");
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}
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pub const panic = runtime.panic;
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comptime {
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_ = &runtime.start._start;
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}
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