46 lines
1.2 KiB
Rust
46 lines
1.2 KiB
Rust
// Copyright 2022 The ChromiumOS Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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use std::process::exit;
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use anyhow::Context;
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use anyhow::Result;
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use gpu_display::GpuDisplay;
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use gpu_display::SurfaceType;
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fn run() -> Result<()> {
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let mut disp = GpuDisplay::open_x(None::<&str>).context("open_x")?;
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let surface_id = disp
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.create_surface(None, 1280, 1024, SurfaceType::Scanout)
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.context("create_surface")?;
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let mem = disp.framebuffer(surface_id).context("framebuffer")?;
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for y in 0..1024 {
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let mut row = [0u32; 1280];
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for (x, item) in row.iter_mut().enumerate() {
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let b = ((x as f32 / 1280.0) * 256.0) as u32;
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let g = ((y as f32 / 1024.0) * 256.0) as u32;
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*item = b | (g << 8);
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}
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mem.as_volatile_slice()
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.offset(1280 * 4 * y)
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.unwrap()
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.copy_from(&row);
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}
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disp.flip(surface_id);
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while !disp.close_requested(surface_id) {
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disp.dispatch_events().context("dispatch_events")?;
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}
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Ok(())
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}
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fn main() {
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if let Err(e) = run() {
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eprintln!("error: {:#}", e);
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exit(1);
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}
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}
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