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Copy pathblobs.rs
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230 lines (188 loc) · 6.78 KB
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use miniquad::*;
#[repr(C)]
struct Vec2 {
x: f32,
y: f32,
}
#[repr(C)]
struct Vertex {
pos: Vec2,
uv: Vec2,
}
struct Stage {
pipeline: Pipeline,
bindings: Bindings,
start_time: f64,
last_frame: f64,
uniforms: shader::Uniforms,
blobs_velocities: [(f32, f32); 32],
}
impl Stage {
pub fn new(ctx: &mut Context) -> Stage {
#[rustfmt::skip]
let vertices: [Vertex; 4] = [
Vertex { pos : Vec2 { x: -1.0, y: -1.0 }, uv: Vec2 { x: 0., y: 0. } },
Vertex { pos : Vec2 { x: 1.0, y: -1.0 }, uv: Vec2 { x: 1., y: 0. } },
Vertex { pos : Vec2 { x: 1.0, y: 1.0 }, uv: Vec2 { x: 1., y: 1. } },
Vertex { pos : Vec2 { x: -1.0, y: 1.0 }, uv: Vec2 { x: 0., y: 1. } },
];
let vertex_buffer = Buffer::immutable(ctx, BufferType::VertexBuffer, &vertices);
let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
let index_buffer = Buffer::immutable(ctx, BufferType::IndexBuffer, &indices);
let bindings = Bindings {
vertex_buffers: vec![vertex_buffer],
index_buffer: index_buffer,
images: vec![],
};
let shader = Shader::new(ctx, shader::VERTEX, shader::FRAGMENT, shader::meta()).unwrap();
let pipeline = Pipeline::new(
ctx,
&[BufferLayout::default()],
&[
VertexAttribute::new("pos", VertexFormat::Float2),
VertexAttribute::new("uv", VertexFormat::Float2),
],
shader,
);
let uniforms = shader::Uniforms {
time: 0.,
blobs_count: 1,
blobs_positions: [(0., 0.); 32],
};
let time = miniquad::date::now();
Stage {
pipeline,
bindings,
start_time: time,
uniforms,
blobs_velocities: [(0., 0.); 32],
last_frame: time,
}
}
}
impl EventHandler for Stage {
fn update(&mut self, _ctx: &mut Context) {
let time = miniquad::date::now();
let delta = (time - self.last_frame) as f32;
self.last_frame = time;
for i in 1..self.uniforms.blobs_count as usize {
self.uniforms.blobs_positions[i].0 += self.blobs_velocities[i].0 * delta * 0.1;
self.uniforms.blobs_positions[i].1 += self.blobs_velocities[i].1 * delta * 0.1;
if self.uniforms.blobs_positions[i].0 < 0. || self.uniforms.blobs_positions[i].0 > 1. {
self.blobs_velocities[i].0 *= -1.;
}
if self.uniforms.blobs_positions[i].1 < 0. || self.uniforms.blobs_positions[i].1 > 1. {
self.blobs_velocities[i].1 *= -1.;
}
}
}
fn mouse_motion_event(&mut self, ctx: &mut Context, x: f32, y: f32) {
let (w, h) = ctx.screen_size();
let (x, y) = (x / w, 1. - y / h);
self.uniforms.blobs_positions[0] = (x, y);
}
fn mouse_button_down_event(&mut self, ctx: &mut Context, _button: MouseButton, x: f32, y: f32) {
if self.uniforms.blobs_count >= 32 {
return;
}
let (w, h) = ctx.screen_size();
let (x, y) = (x / w, 1. - y / h);
let (dx, dy) = (quad_rand::gen_range(-1., 1.), quad_rand::gen_range(-1., 1.));
self.uniforms.blobs_positions[self.uniforms.blobs_count as usize] = (x, y);
self.blobs_velocities[self.uniforms.blobs_count as usize] = (dx, dy);
self.uniforms.blobs_count += 1;
}
fn draw(&mut self, ctx: &mut Context) {
self.uniforms.time = (miniquad::date::now() - self.start_time) as f32;
ctx.begin_default_pass(Default::default());
ctx.apply_pipeline(&self.pipeline);
ctx.apply_bindings(&self.bindings);
ctx.apply_uniforms(&self.uniforms);
ctx.draw(0, 6, 1);
ctx.end_render_pass();
ctx.commit_frame();
}
}
fn main() {
miniquad::start(conf::Conf::default(), |mut ctx| {
Box::new(Stage::new(&mut ctx))
});
}
// based on: https://www.shadertoy.com/view/XsS3DV
mod shader {
use miniquad::*;
pub const VERTEX: &str = r#"#version 100
attribute vec2 pos;
attribute vec2 uv;
uniform vec2 offset;
varying highp vec2 texcoord;
void main() {
gl_Position = vec4(pos + offset, 0, 1);
texcoord = uv;
}"#;
pub const FRAGMENT: &str = r#"#version 100
precision highp float;
varying vec2 texcoord;
uniform float time;
uniform int blobs_count;
uniform vec2 blobs_positions[32];
float k = 20.0;
float field = 0.0;
vec2 coord;
void circle ( float r , vec3 col , vec2 offset) {
vec2 pos = coord.xy;
vec2 c = offset;
float d = distance ( pos , c );
field += ( k * r ) / ( d*d );
}
vec3 band ( float shade, float low, float high, vec3 col1, vec3 col2 ) {
if ( (shade >= low) && (shade <= high) ) {
float delta = (shade - low) / (high - low);
vec3 colDiff = col2 - col1;
return col1 + (delta * colDiff);
}
else
return vec3(0.0,0.0,0.0);
}
vec3 gradient ( float shade ) {
vec3 colour = vec3( (sin(time/2.0)*0.25)+0.25,0.0,(cos(time/2.0)*0.25)+0.25);
vec3 col1 = vec3(0.01, 0.0, 1.0-0.01);
vec3 col2 = vec3(1.0-0.01, 0.0, 0.01);
vec3 col3 = vec3(0.02, 1.0-0.02, 0.02);
vec3 col4 = vec3((0.01+0.02)/2.0, (0.01+0.02)/2.0, 1.0 - (0.01+0.02)/2.0);
vec3 col5 = vec3(0.02, 0.02, 0.02);
colour += band ( shade, 0.0, 0.3, colour, col1 );
colour += band ( shade, 0.3, 0.6, col1, col2 );
colour += band ( shade, 0.6, 0.8, col2, col3 );
colour += band ( shade, 0.8, 0.9, col3, col4 );
colour += band ( shade, 0.9, 1.0, col4, col5 );
return colour;
}
void main() {
coord = texcoord;
for (int i = 0; i < 32; i++) {
if (i >= blobs_count) { break; } // workaround for webgl error: Loop index cannot be compared with non-constant expression
circle(.03 , vec3(0.7 ,0.2, 0.8), blobs_positions[i]);
}
float shade = min ( 1.0, max ( field/256.0, 0.0 ) );
gl_FragColor = vec4( gradient(shade), 1.0 );
}"#;
pub fn meta() -> ShaderMeta {
ShaderMeta {
images: vec![],
uniforms: UniformBlockLayout {
uniforms: vec![
UniformDesc::new("time", UniformType::Float1),
UniformDesc::new("blobs_count", UniformType::Int1),
UniformDesc::new("blobs_positions", UniformType::Float2).array(32),
],
},
}
}
#[repr(C)]
pub struct Uniforms {
pub time: f32,
pub blobs_count: i32,
pub blobs_positions: [(f32, f32); 32],
}
}