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custom_attribute.rs

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use processing_glfw::GlfwContext;

use bevy::math::{Vec3, Vec4};

use processing::prelude::*;

use processing_render::geometry::{AttributeFormat, Topology};

use processing_render::render::command::DrawCommand;

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(600, 600, false)?;

init(Config::default())?;

let width = 600;

let height = 600;

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

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

let custom_attr = geometry_attribute_create("Custom", AttributeFormat::Float)?;

let layout = geometry_layout_create()?;

geometry_layout_add_position(layout)?;

geometry_layout_add_normal(layout)?;

geometry_layout_add_color(layout)?;

geometry_layout_add_attribute(layout, custom_attr)?;

let mesh = geometry_create_with_layout(layout, Topology::LineStrip)?;

geometry_color(mesh, Vec4::new(1.0, 0.0, 0.0, 1.0))?;

geometry_normal(mesh, Vec3::new(0.0, 0.0, 1.0))?;

geometry_attribute_float(mesh, custom_attr, 0.0)?;

geometry_vertex(mesh, Vec3::new(-50.0, -50.0, 0.0))?;

geometry_color(mesh, Vec4::new(0.0, 1.0, 0.0, 1.0))?;

geometry_attribute_float(mesh, custom_attr, 0.5)?;

geometry_vertex(mesh, Vec3::new(50.0, -50.0, 0.0))?;

geometry_color(mesh, Vec4::new(0.0, 0.0, 1.0, 1.0))?;

geometry_attribute_float(mesh, custom_attr, 1.0)?;

geometry_vertex(mesh, Vec3::new(0.0, 50.0, 0.0))?;

geometry_index(mesh, 0)?;

geometry_index(mesh, 1)?;

geometry_index(mesh, 2)?;

geometry_index(mesh, 0)?;

graphics_mode_3d(graphics)?;

transform_set_position(graphics, Vec3::new(0.0, 0.0, 200.0))?;

transform_look_at(graphics, Vec3::new(0.0, 0.0, 0.0))?;

while glfw_ctx.poll_events() {

graphics_begin_draw(graphics)?;

graphics_record_command(

graphics,

DrawCommand::BackgroundColor(bevy::color::Color::srgb(0.1, 0.1, 0.12)),

)?;

graphics_record_command(graphics, DrawCommand::Geometry(mesh))?;

graphics_end_draw(graphics)?;

}

Ok(())

}