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use luminance::context::GraphicsContext;
use luminance::framebuffer::Framebuffer;
use luminance::pipeline::PipelineState;
use luminance::render_state::RenderState;
use luminance::shader::program::Program;
use luminance::tess::{Mode, Tess, TessBuilder, TessSliceIndex};
use luminance::texture::Dim2;
use crate::constants;
use crate::vertex::{Vertex, VertexPosition, VertexRGB, VertexSemantics};
fn gen_rectangle(x1: f32, y1: f32, x2: f32, y2: f32, color: [u8; 3]) -> Vec<Vertex> {
let mut vertices: Vec<Vertex> = Vec::new();
vertices.push(Vertex {
position: VertexPosition::new([x1, y1]),
color: VertexRGB::new(color),
});
vertices.push(Vertex {
position: VertexPosition::new([x1, y2]),
color: VertexRGB::new(color),
});
vertices.push(Vertex {
position: VertexPosition::new([x2, y2]),
color: VertexRGB::new(color),
});
vertices.push(Vertex {
position: VertexPosition::new([x2, y1]),
color: VertexRGB::new(color),
});
vertices
}
fn gen_border() -> Vec<Vec<Vertex>> {
let mut vertices: Vec<Vec<Vertex>> = Vec::new();
vertices.push(gen_rectangle(-1.0, -1.0, 1.0, -0.9, constants::C64_RED));
vertices.push(gen_rectangle(-1.0, -1.0, -0.9, 1.0, constants::C64_GREEN));
vertices.push(gen_rectangle(-1.0, 1.0, 1.0, 0.9, constants::C64_BLUE));
vertices.push(gen_rectangle(0.9, 1.0, 1.0, -1.0, constants::C64_VIOLET));
vertices
}
fn relative(x: f32, in_min: f32, in_max: f32, out_min: f32, out_max: f32) -> f32 {
(x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min
}
#[derive(Default)]
pub struct Tom {
border: Vec<Vec<Vertex>>,
wave: Vec<Vertex>,
last_x: usize,
waveform: Vec<i16>,
tessalations: Vec<Tess>,
}
impl Tom {
pub fn new(waveform: Vec<i16>) -> Tom {
Tom {
waveform,
border: gen_border(),
wave: Vec::new(),
last_x: 0,
tessalations: Vec::new(),
}
}
pub fn update<T: GraphicsContext>(&mut self, mut surface: T) -> T {
self.tessalations.clear();
self.update_wave();
for vertices in self.border.iter() {
self.tessalations.push(
TessBuilder::new(&mut surface)
.add_vertices(vertices)
.set_mode(Mode::TriangleFan)
.build()
.unwrap(),
);
}
self.tessalations.push(
TessBuilder::new(&mut surface)
.add_vertices(&self.wave)
.set_mode(Mode::LineStrip)
.build()
.unwrap(),
);
surface
}
pub fn draw<T: GraphicsContext>(
&self,
mut surface: T,
back_buffer: &Framebuffer<Dim2, (), ()>,
program: &Program<VertexSemantics, (), ()>,
pipeline_state: &PipelineState,
) -> T {
surface.pipeline_builder().pipeline(
&back_buffer,
&pipeline_state,
|_pipeline, mut shd_gate| {
shd_gate.shade(&program, |_, mut rdr_gate| {
rdr_gate.render(&RenderState::default(), |mut tess_gate| {
for tessalation in self.tessalations.iter() {
tess_gate.render(tessalation.slice(..));
}
});
});
},
);
surface
}
fn update_wave(&mut self) {
self.wave.clear();
let start = self.last_x;
let end = start + 3000;
let mut positions = Vec::new();
for x in start..end {
positions.push(VertexPosition::new([x as f32, self.waveform[x] as f32]));
}
for position in positions {
let color = match position[1].abs() as u32 {
0..=50 => VertexRGB::new(constants::C64_BLUE),
51..=125 => VertexRGB::new(constants::C64_LIGHT_BLUE),
126..=225 => VertexRGB::new(constants::C64_CYAN),
_ => VertexRGB::new(constants::C64_GREEN),
};
self.wave.push(Vertex { position, color });
}
let max_y = *self.waveform.iter().max().unwrap() as f32;
let min_y = *self.waveform.iter().min().unwrap() as f32;
for vertex in self.wave.iter_mut() {
vertex.position[0] = relative(vertex.position[0], start as f32, end as f32, -0.9, 0.9);
vertex.position[1] = relative(vertex.position[1], max_y, min_y, -0.9, 0.9);
}
self.wave.reverse();
self.last_x += constants::SAMPLE_RATE / 60;
}
}
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