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update_pixels.rs

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use processing_glfw::GlfwContext;

use bevy::{color::Color, prelude::LinearRgba};

use processing::prelude::*;

fn main() {

match sketch() {

Ok(_) => {

eprintln!("Sketch completed successfully");

exit(0).unwrap();

}

Err(e) => {

eprintln!("Sketch error: {:?}", e);

exit(1).unwrap();

}

};

}

fn sketch() -> error::Result<()> {

let mut glfw_ctx = GlfwContext::new(100, 100, false)?;

init(Config::default())?;

let width = 100;

let height = 100;

let surface = glfw_ctx.create_surface(width, height, false)?;

let graphics = graphics_create(surface, width, height, TextureFormat::Rgba16Float)?;

let rect_w = 10;

let rect_h = 10;

let red = LinearRgba::new(1.0, 0.0, 0.0, 1.0);

let red_pixels: Vec<LinearRgba> = vec![red; rect_w * rect_h];

let blue = LinearRgba::new(0.0, 0.0, 1.0, 1.0);

let blue_pixels: Vec<LinearRgba> = vec![blue; rect_w * rect_h];

let mut first_frame = true;

while glfw_ctx.poll_events() {

graphics_begin_draw(graphics)?;

graphics_record_command(graphics, DrawCommand::BackgroundColor(Color::BLACK))?;

graphics_flush(graphics)?;

graphics_update_region(graphics, 20, 20, rect_w as u32, rect_h as u32, &red_pixels)?;

graphics_update_region(graphics, 60, 60, rect_w as u32, rect_h as u32, &blue_pixels)?;

graphics_end_draw(graphics)?;

if first_frame {

first_frame = false;

let pixels = graphics_readback(graphics)?;

eprintln!("Total pixels: {}", pixels.len());

for y in 0..height {

for x in 0..width {

let idx = (y * width + x) as usize;

if idx < pixels.len() {

let pixel = pixels[idx];

if pixel.red > 0.5 {

eprint!("R");

} else if pixel.blue > 0.5 {

eprint!("B");

} else if pixel.alpha > 0.5 {

eprint!(".");

} else {

eprint!(" ");

}

eprintln!();

}

eprintln!("\nSample pixels:");

eprintln!("(25, 25): {:?}", pixels[25 * width as usize + 25]);

eprintln!("(65, 65): {:?}", pixels[65 * width as usize + 65]);

eprintln!("(0, 0): {:?}", pixels[0]);

eprintln!("(50, 50): {:?}", pixels[50 * width as usize + 50]);

}

Ok(())

}