aolo2
/
desk2
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

The gooder biba

infinite
A.Olokhtonov 2 years ago
parent
5593536485
commit
5c0d9e1537
7 changed files with 448 additions and 392 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 2
      client/cursor.js
  2. 28
      client/math.js
  3. 15
      client/webgl.html
  4. 458
      client/webgl.js
  5. 115
      client/webgl_geometry.js
  6. 111
      client/webgl_listeners.js
  7. 111
      client/webgl_shaders.js

2
client/cursor.js
Unescape View File

@ -228,7 +228,7 @@ function on_resize(e) { @@ -228,7 +228,7 @@ function on_resize(e) {
const width = window.innerWidth;
const height = window.innerHeight;
elements.canvas0.width = elements.canvas1.width = width;
elements.canvas0.width = elements.canvas1.width = width;
elements.canvas0.height = elements.canvas1.height = height;
storage.ctx1.lineJoin = storage.ctx1.lineCap = storage.ctx0.lineJoin = storage.ctx0.lineCap = 'round';

28
client/math.js
Unescape View File

@ -4,7 +4,7 @@ function point_right_of_line(a, b, p) { @@ -4,7 +4,7 @@ function point_right_of_line(a, b, p) {
}
function rdp_find_max(points, start, end) {
const EPS = 0.25;
const EPS = 0.5;
let result = -1;
let max_dist = 0;
@ -227,4 +227,30 @@ function dist_v2(a, b) { @@ -227,4 +227,30 @@ function dist_v2(a, b) {
const dx = a.x - b.x;
const dy = a.y - b.y;
return Math.sqrt(dx * dx + dy * dy);
}
function perpendicular(ax, ay, bx, by, width) {
// Place points at (stroke_width / 2) distance from the line
const dirx = bx - ax;
const diry = by - ay;
let pdirx = diry;
let pdiry = -dirx;
const pdir_norm = Math.sqrt(pdirx * pdirx + pdiry * pdiry);
pdirx /= pdir_norm;
pdiry /= pdir_norm;
return {
'p1': {
'x': ax + pdirx * width / 2,
'y': ay + pdiry * width / 2,
},
'p2': {
'x': ax - pdirx * width / 2,
'y': ay - pdiry * width / 2,
}
};
}

15
client/webgl.html
Unescape View File

@ -5,8 +5,12 @@ @@ -5,8 +5,12 @@
<title>Desk</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="shortcut icon" href="icons/favicon.svg" id="favicon">
<script type="text/javascript" src="math.js?v=1"></script>
<script type="text/javascript" src="webgl.js?v=1"></script>
<script type="text/javascript" src="math.js?v=3"></script>
<script type="text/javascript" src="webgl_geometry.js?v=2"></script>
<script type="text/javascript" src="webgl_shaders.js?v=2"></script>
<script type="text/javascript" src="webgl_listeners.js?v=2"></script>
<script type="text/javascript" src="webgl.js?v=2"></script>
<style>
html, body {
@ -16,6 +20,13 @@ @@ -16,6 +20,13 @@
height: 100%;
overflow: hidden;
}
canvas {
width: 100%;
height: 100%;
display: block;
cursor: crosshair;
}
</style>
</head>
<body>

458
client/webgl.js
Unescape View File

@ -1,407 +1,89 @@ @@ -1,407 +1,89 @@
document.addEventListener('DOMContentLoaded', main);
const vertex_shader_source = `
attribute vec2 a_pos;
attribute vec3 a_triangle_color;
uniform vec2 u_scale;
uniform vec2 u_res;
uniform vec2 u_translation;
uniform int u_layer;
varying vec3 v_triangle_color;
void main() {
vec2 screen01 = (a_pos * u_scale + u_translation) / u_res;
vec2 screen02 = screen01 * 2.0;
screen02.y = 2.0 - screen02.y;
vec2 screen11 = screen02 - 1.0;
v_triangle_color = a_triangle_color;
gl_Position = vec4(screen11, u_layer, 1);
}
`;
const fragment_shader_source = `
precision mediump float;
uniform vec3 u_color;
varying vec3 v_triangle_color;
void main() {
gl_FragColor = vec4(v_triangle_color, 1);
}
`;
function create_shader(gl, type, source) {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
return shader;
}
console.error(type, ':', gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
}
function create_program(gl, vs, fs) {
const program = gl.createProgram();
gl.attachShader(program, vs);
gl.attachShader(program, fs);
gl.linkProgram(program);
if (gl.getProgramParameter(program, gl.LINK_STATUS)) {
return program;
}
console.error('link:', gl.getProgramInfoLog(program));
gl.deleteProgram(program);
}
function perpendicular(ax, ay, bx, by, width) {
// Place points at (stroke_width / 2) distance from the line
const dirx = bx - ax;
const diry = by - ay;
let pdirx = diry;
let pdiry = -dirx;
const pdir_norm = Math.sqrt(pdirx * pdirx + pdiry * pdiry);
pdirx /= pdir_norm;
pdiry /= pdir_norm;
return {
'p1': {
'x': ax + pdirx * width / 2,
'y': ay + pdiry * width / 2,
},
'p2': {
'x': ax - pdirx * width / 2,
'y': ay - pdiry * width / 2,
}
};
}
const canvas_offset = { 'x': 0, 'y': 0 };
let moving = false;
let spacedown = false;
let drawing = false;
let canvas_zoom = 5.0;
let current_stroke = [];
const bgcolor = { 'r': 0, 'g': 0, 'b': 0 };
const stroke_color = { 'r': 0.2, 'g': 0.2, 'b': 0.2 };
let debug_draw = true;
function push_circle_at(positions, c, o) {
positions.push(c.x + o[0].x, c.y + o[0].y, c.x + o[4].x, c.y + o[4].y, c.x + o[8].x, c.y + o[8].y);
positions.push(c.x + o[4].x, c.y + o[4].y, c.x + o[0].x, c.y + o[0].y, c.x + o[2].x, c.y + o[2].y);
positions.push(c.x + o[8].x, c.y + o[8].y, c.x + o[4].x, c.y + o[4].y, c.x + o[6].x, c.y + o[6].y);
positions.push(c.x + o[0].x, c.y + o[0].y, c.x + o[8].x, c.y + o[8].y, c.x + o[10].x, c.y + o[10].y);
positions.push(c.x + o[2].x, c.y + o[2].y, c.x + o[0].x, c.y + o[0].y, c.x + o[1].x, c.y + o[1].y);
positions.push(c.x + o[4].x, c.y + o[4].y, c.x + o[2].x, c.y + o[2].y, c.x + o[3].x, c.y + o[3].y);
positions.push(c.x + o[6].x, c.y + o[6].y, c.x + o[4].x, c.y + o[4].y, c.x + o[5].x, c.y + o[5].y);
positions.push(c.x + o[8].x, c.y + o[8].y, c.x + o[6].x, c.y + o[6].y, c.x + o[7].x, c.y + o[7].y);
positions.push(c.x + o[10].x, c.y + o[10].y, c.x + o[8].x, c.y + o[8].y, c.x + o[9].x, c.y + o[9].y);
positions.push(c.x + o[0].x, c.y + o[0].y, c.x + o[10].x, c.y + o[10].y, c.x + o[11].x, c.y + o[11].y);
}
function push_stroke_positions(stroke, stroke_width, positions) {
const points = stroke.points;
if (points.length < 2) {
// TODO
return;
}
// Simple 12 point circle (store offsets and reuse)
const POINTS = 12;
const phi_step = 2 * Math.PI / POINTS;
const circle_offsets = [];
for (let i = 0; i < POINTS; ++i) {
const phi = phi_step * i;
const ox = stroke_width / 2 * Math.cos(phi);
const oy = stroke_width / 2 * Math.sin(phi);
circle_offsets.push({'x': ox, 'y': oy});
}
for (let i = 0; i < points.length - 1; ++i) {
const px = points[i].x;
const py = points[i].y;
const nextpx = points[i + 1].x;
const nextpy = points[i + 1].y;
const d1x = nextpx - px;
const d1y = nextpy - py;
// Perpendicular to (d1x, d1y), points to the LEFT
let perp1x = -d1y;
let perp1y = d1x;
const perpnorm1 = Math.sqrt(perp1x * perp1x + perp1y * perp1y);
perp1x /= perpnorm1;
perp1y /= perpnorm1;
const s1x = px + perp1x * stroke_width / 2;
const s1y = py + perp1y * stroke_width / 2;
const s2x = px - perp1x * stroke_width / 2;
const s2y = py - perp1y * stroke_width / 2;
const s3x = nextpx + perp1x * stroke_width / 2;
const s3y = nextpy + perp1y * stroke_width / 2;
const s4x = nextpx - perp1x * stroke_width / 2;
const s4y = nextpy - perp1y * stroke_width / 2;
positions.push(s1x, s1y, s2x, s2y, s4x, s4y);
positions.push(s1x, s1y, s4x, s4y, s3x, s3y);
push_circle_at(positions, points[i], circle_offsets);
}
push_circle_at(positions, points[points.length - 1], circle_offsets);
}
function draw(gl, program, locations, buffers, strokes) {
function draw(state, context) {
const gl = context.gl;
const locations = context.locations;
const buffers = context.buffers;
const width = window.innerWidth;
const height = window.innerHeight;
if (gl.canvas.width !== width || gl.canvas.height !== height) {
gl.canvas.width = width;
gl.canvas.height = height;
gl.viewport(0, 0, width, height);
}
gl.clearColor(bgcolor.r, bgcolor.g, bgcolor.b, 1);
gl.viewport(0, 0, context.canvas.width, context.canvas.height);
gl.clearColor(context.bgcolor.r, context.bgcolor.g, context.bgcolor.b, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
gl.useProgram(program);
gl.useProgram(context.program);
gl.enableVertexAttribArray(locations['a_pos']);
gl.enableVertexAttribArray(locations['a_triangle_color']);
gl.uniform2f(locations['u_res'], width, height);
gl.uniform2f(locations['u_scale'], canvas_zoom, canvas_zoom);
gl.uniform2f(locations['u_translation'], canvas_offset.x, canvas_offset.y);
const positions = [];
const colors = [];
const stroke_width = 10;
for (const stroke of strokes) {
push_stroke_positions(stroke, stroke_width, positions);
}
if (current_stroke.length > 0) {
push_stroke_positions({'points': current_stroke}, stroke_width, positions);
}
const npoints = positions.length / 2;
for (let i = 0; i < npoints; i += 3) {
if (!debug_draw) {
positions.push(0, 0, 0);
positions.push(0, 0, 0);
positions.push(0, 0, 0);
} else {
let r = (i * 761257125 % 255) / 255.0;
let g = (i * 871295862 % 255) / 255.0;
let b = (i * 287238767 % 255) / 255.0;
if (r < 0.3) r = 0.3;
if (g < 0.3) g = 0.3;
if (b < 0.3) b = 0.3;
positions.push(r, g, b);
positions.push(r, g, b);
positions.push(r, g, b);
}
}
const posf32 = new Float32Array(positions);
const pointbytes = 4 * npoints * 2;
gl.bindBuffer(gl.ARRAY_BUFFER, buffers['in']);
gl.bufferData(gl.ARRAY_BUFFER, posf32.byteLength, gl.STATIC_DRAW);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, posf32.slice(0, npoints * 2));
gl.bufferSubData(gl.ARRAY_BUFFER, pointbytes, posf32.slice(npoints * 2));
{
// Tell the attribute how to get data out of positionBuffer (ARRAY_BUFFER)
const size = 2; // 2 components per iteration
const type = gl.FLOAT; // the data is 32bit floats
const normalize = false; // don't normalize the data
const stride = 0; // 0 = move forward size * sizeof(type) each iteration to get the next position
const offset = 0; // start at the beginning of the buffer
gl.vertexAttribPointer(locations['a_pos'], size, type, normalize, stride, offset);
}
{
// Tell the attribute how to get data out of positionBuffer (ARRAY_BUFFER)
const size = 3; // 3 components per iteration
const type = gl.FLOAT; // the data is 32bit floats
const normalize = false; // don't normalize the data
const stride = 0; // 0 = move forward size * sizeof(type) each iteration to get the next position
const offset = pointbytes; // start at the beginning of the buffer
gl.vertexAttribPointer(locations['a_triangle_color'], size, type, normalize, stride, offset);
}
{
const offset = 0;
const count = npoints;
gl.uniform3f(locations['u_color'], stroke_color.r, stroke_color.g, stroke_color.b);
gl.uniform1i(locations['u_layer'], 0);
gl.drawArrays(gl.TRIANGLES, offset, count);
}
window.requestAnimationFrame(() => draw(gl, program, locations, buffers, strokes));
gl.enableVertexAttribArray(locations['a_color']);
gl.uniform2f(locations['u_res'], context.canvas.width, context.canvas.height);
gl.uniform2f(locations['u_scale'], state.canvas.zoom, state.canvas.zoom);
gl.uniform2f(locations['u_translation'], state.canvas.offset.x, state.canvas.offset.y);
gl.uniform1i(locations['u_layer'], 0);
const total_pos_size = context.static_positions_f32.byteLength + context.dynamic_positions_f32.byteLength;
const total_color_size = context.static_colors_u8.byteLength + context.dynamic_colors_u8.byteLength;
const total_point_count = (context.static_positions.length + context.dynamic_positions.length) / 2;
gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_pos']);
gl.vertexAttribPointer(locations['a_pos'], 2, gl.FLOAT, false, 0, 0);
gl.bufferData(gl.ARRAY_BUFFER, total_pos_size, gl.DYNAMIC_DRAW);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, context.static_positions_f32);
gl.bufferSubData(gl.ARRAY_BUFFER, context.static_positions_f32.byteLength, context.dynamic_positions_f32);
gl.bindBuffer(gl.ARRAY_BUFFER, buffers['b_color']);
gl.vertexAttribPointer(locations['a_color'], 3, gl.UNSIGNED_BYTE, true, 0, 0);
gl.bufferData(gl.ARRAY_BUFFER, total_color_size, gl.DYNAMIC_DRAW);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, context.static_colors_u8);
gl.bufferSubData(gl.ARRAY_BUFFER, context.static_colors_u8.byteLength, context.dynamic_colors_u8);
gl.drawArrays(gl.TRIANGLES, 0, total_point_count);
}
function main() {
const canvas = document.querySelector('#c');
const gl = canvas.getContext('webgl');
if (!gl) {
console.error('FUCK!')
return;
}
const vertex_shader = create_shader(gl, gl.VERTEX_SHADER, vertex_shader_source);
const fragment_shader = create_shader(gl, gl.FRAGMENT_SHADER, fragment_shader_source);
const program = create_program(gl, vertex_shader, fragment_shader)
const locations = {};
const buffers = {};
locations['a_pos'] = gl.getAttribLocation(program, 'a_pos');
locations['a_triangle_color'] = gl.getAttribLocation(program, 'a_triangle_color');
locations['u_res'] = gl.getUniformLocation(program, 'u_res');
locations['u_scale'] = gl.getUniformLocation(program, 'u_scale');
locations['u_translation'] = gl.getUniformLocation(program, 'u_translation');
locations['u_color'] = gl.getUniformLocation(program, 'u_color');
locations['u_layer'] = gl.getUniformLocation(program, 'u_layer');
buffers['in'] = gl.createBuffer();
const strokes = [
{
'points': [
{'x': 100, 'y': 100},
{'x': 105, 'y': 500},
{'x': 108, 'y': 140},
{'x': 508, 'y': 240},
]
}
];
window.addEventListener('keydown', (e) => {
if (e.code === 'Space') {
spacedown = true;
} else if (e.code === 'KeyD') {
debug_draw = !debug_draw;
if (debug_draw) {
stroke_color.r = 0.2;
stroke_color.g = 0.2;
stroke_color.b = 0.2;
bgcolor.r = 0;
bgcolor.g = 0;
bgcolor.b = 0;
} else {
stroke_color.r = 0;
stroke_color.g = 0;
stroke_color.b = 0;
bgcolor.r = 1;
bgcolor.g = 1;
bgcolor.b = 1;
}
}
});
window.addEventListener('keyup', (e) => {
if (e.code === 'Space') {
spacedown = false;
moving = false;
}
});
const state = {
'canvas': {
'offset': { 'x': 0, 'y': 0 },
'zoom': 1.0,
},
canvas.addEventListener('mousedown', (e) => {
if (spacedown) {
moving = true;
return;
}
'cursor': {
'x': 0,
'y': 0,
},
const x = cursor_x = (e.clientX - canvas_offset.x) / canvas_zoom;
const y = cursor_y = (e.clientY - canvas_offset.y) / canvas_zoom;
'moving': false,
'drawing': false,
'spacedown': false,
current_stroke.length = 0;
current_stroke.push({'x': x, 'y': y});
drawing = true;
});
canvas.addEventListener('mousemove', (e) => {
if (moving) {
canvas_offset.x += e.movementX;
canvas_offset.y += e.movementY;
return;
}
'stroke_width': 8,
if (drawing) {
const x = cursor_x = (e.clientX - canvas_offset.x) / canvas_zoom;
const y = cursor_y = (e.clientY - canvas_offset.y) / canvas_zoom;
current_stroke.push({'x': x, 'y': y});
}
});
canvas.addEventListener('mouseup', (e) => {
if (spacedown) {
moving = false;
return;
}
if (drawing) {
strokes.push({'points': process_stroke(current_stroke)});
current_stroke.length = 0;
drawing = false;
return;
}
});
canvas.addEventListener('wheel', (e) => {
const x = Math.round((e.clientX - canvas_offset.x) / canvas_zoom);
const y = Math.round((e.clientY - canvas_offset.y) / canvas_zoom);
const dz = (e.deltaY < 0 ? 0.1 : -0.1);
const old_zoom = canvas_zoom;
canvas_zoom *= (1.0 + dz);
if (canvas_zoom > 100.0) {
canvas_zoom = old_zoom;
return;
}
'current_stroke': {
'color': 0,
'points': [],
},
if (canvas_zoom < 0.2) {
canvas_zoom = old_zoom;
return;
}
'strokes': [],
};
const zoom_offset_x = Math.round((dz * old_zoom) * x);
const zoom_offset_y = Math.round((dz * old_zoom) * y);
const context = {
'canvas': null,
'gl': null,
'program': null,
'buffers': {},
'locations': {},
'static_positions': [],
'dynamic_positions': [],
'static_colors': [],
'dynamic_colors': [],
'static_positions_f32': new Float32Array(0),
'dynamic_positions_f32': new Float32Array(0),
'static_colors_u8': new Uint8Array(0),
'dynamic_colors_u8': new Uint8Array(0),
'bgcolor': {'r': 0, 'g': 0, 'b': 0},
};
canvas_offset.x -= zoom_offset_x;
canvas_offset.y -= zoom_offset_y;
});
init_webgl(state, context);
init_listeners(state, context);
window.requestAnimationFrame(() => draw(gl, program, locations, buffers, strokes));
window.requestAnimationFrame(() => draw(state, context));
}

115
client/webgl_geometry.js
Unescape View File

@ -0,0 +1,115 @@ @@ -0,0 +1,115 @@
function push_circle_at(positions, cl, r, g, b, c, o) {
positions.push(c.x + o[0].x, c.y + o[0].y, c.x + o[4].x, c.y + o[4].y, c.x + o[8].x, c.y + o[8].y);
positions.push(c.x + o[4].x, c.y + o[4].y, c.x + o[0].x, c.y + o[0].y, c.x + o[2].x, c.y + o[2].y);
positions.push(c.x + o[8].x, c.y + o[8].y, c.x + o[4].x, c.y + o[4].y, c.x + o[6].x, c.y + o[6].y);
positions.push(c.x + o[0].x, c.y + o[0].y, c.x + o[8].x, c.y + o[8].y, c.x + o[10].x, c.y + o[10].y);
positions.push(c.x + o[2].x, c.y + o[2].y, c.x + o[0].x, c.y + o[0].y, c.x + o[1].x, c.y + o[1].y);
positions.push(c.x + o[4].x, c.y + o[4].y, c.x + o[2].x, c.y + o[2].y, c.x + o[3].x, c.y + o[3].y);
positions.push(c.x + o[6].x, c.y + o[6].y, c.x + o[4].x, c.y + o[4].y, c.x + o[5].x, c.y + o[5].y);
positions.push(c.x + o[8].x, c.y + o[8].y, c.x + o[6].x, c.y + o[6].y, c.x + o[7].x, c.y + o[7].y);
positions.push(c.x + o[10].x, c.y + o[10].y, c.x + o[8].x, c.y + o[8].y, c.x + o[9].x, c.y + o[9].y);
positions.push(c.x + o[0].x, c.y + o[0].y, c.x + o[10].x, c.y + o[10].y, c.x + o[11].x, c.y + o[11].y);
for (let i = 0; i < 3 * 10; ++i) {
cl.push(r, g, b);
}
}
function push_stroke(state, stroke, positions, colors) {
const stroke_width = state.stroke_width;
const points = stroke.points;
const color_u32 = stroke.color;
const r = (color_u32 >> 16) & 0xFF;
const g = (color_u32 >> 8) & 0xFF;
const b = color_u32 & 0xFF;
if (points.length < 2) {
// TODO
return;
}
// Simple 12 point circle (store offsets and reuse)
const POINTS = 12;
const phi_step = 2 * Math.PI / POINTS;
const circle_offsets = [];
for (let i = 0; i < POINTS; ++i) {
const phi = phi_step * i;
const ox = stroke_width / 2 * Math.cos(phi);
const oy = stroke_width / 2 * Math.sin(phi);
circle_offsets.push({'x': ox, 'y': oy});
}
for (let i = 0; i < points.length - 1; ++i) {
const px = points[i].x;
const py = points[i].y;
const nextpx = points[i + 1].x;
const nextpy = points[i + 1].y;
const d1x = nextpx - px;
const d1y = nextpy - py;
// Perpendicular to (d1x, d1y), points to the LEFT
let perp1x = -d1y;
let perp1y = d1x;
const perpnorm1 = Math.sqrt(perp1x * perp1x + perp1y * perp1y);
perp1x /= perpnorm1;
perp1y /= perpnorm1;
const s1x = px + perp1x * stroke_width / 2;
const s1y = py + perp1y * stroke_width / 2;
const s2x = px - perp1x * stroke_width / 2;
const s2y = py - perp1y * stroke_width / 2;
const s3x = nextpx + perp1x * stroke_width / 2;
const s3y = nextpy + perp1y * stroke_width / 2;
const s4x = nextpx - perp1x * stroke_width / 2;
const s4y = nextpy - perp1y * stroke_width / 2;
positions.push(s1x, s1y, s2x, s2y, s4x, s4y);
positions.push(s1x, s1y, s4x, s4y, s3x, s3y);
for (let j = 0; j < 6; ++j) {
colors.push(r, g, b);
}
// Rotate circle offsets so that the diameter of the circle is
// perpendicular to the (dx, dy) vector. This way the circle won't
// "poke out" of the rectangle
const angle = Math.atan(Math.abs(s3x - s4x), Math.abs(s3y - s4y));
push_circle_at(positions, colors, r, g, b, points[i], circle_offsets);
}
// TODO: angle
push_circle_at(positions, colors, r, g, b, points[points.length - 1], circle_offsets);
}
function add_static_stroke(state, context, stroke) {
state.strokes.push(stroke);
push_stroke(state, stroke, context.static_positions, context.static_colors);
context.static_positions_f32 = new Float32Array(context.static_positions);
context.static_colors_u8 = new Uint8Array(context.static_colors);
}
function update_dynamic_stroke(state, context, point) {
state.current_stroke.points.push(point);
context.dynamic_positions.length = 0; // TODO: incremental
context.dynamic_colors.length = 0;
push_stroke(state, state.current_stroke, context.dynamic_positions, context.dynamic_colors);
context.dynamic_positions_f32 = new Float32Array(context.dynamic_positions);
context.dynamic_colors_u8 = new Uint8Array(context.dynamic_colors);
}
function clear_dynamic_stroke(state, context) {
state.current_stroke.points.length = 0;
context.dynamic_positions.length = 0;
context.dynamic_colors.length = 0;
context.dynamic_positions_f32 = new Float32Array(0);
context.dynamic_colors_u8 = new Uint8Array(0);
}

111
client/webgl_listeners.js
Unescape View File

@ -0,0 +1,111 @@ @@ -0,0 +1,111 @@
function init_listeners(state, context) {
window.addEventListener('keydown', (e) => keydown(e, state));
window.addEventListener('keyup', (e) => keyup(e, state));
context.canvas.addEventListener('mousedown', (e) => mousedown(e, state, context));
context.canvas.addEventListener('mousemove', (e) => mousemove(e, state, context));
context.canvas.addEventListener('mouseup', (e) => mouseup(e, state, context));
context.canvas.addEventListener('wheel', (e) => wheel(e, state, context));
}
function keydown(e, state) {
if (e.code === 'Space') {
state.spacedown = true;
} else if (e.code === 'KeyD') {
}
}
function keyup(e, state) {
if (e.code === 'Space') {
state.spacedown = false;
state.moving = false;
}
}
function mousedown(e, state, context) {
if (state.spacedown) {
state.moving = true;
return;
}
const x = cursor_x = (e.clientX - state.canvas.offset.x) / state.canvas.zoom;
const y = cursor_y = (e.clientY - state.canvas.offset.y) / state.canvas.zoom;
clear_dynamic_stroke(state, context);
update_dynamic_stroke(state, context, {'x': x, 'y': y});
state.drawing = true;
window.requestAnimationFrame(() => draw(state, context));
}
function mousemove(e, state, context) {
let do_draw = false;
if (state.moving) {
state.canvas.offset.x += e.movementX;
state.canvas.offset.y += e.movementY;
do_draw = true;
}
if (state.drawing) {
const x = cursor_x = (e.clientX - state.canvas.offset.x) / state.canvas.zoom;
const y = cursor_y = (e.clientY - state.canvas.offset.y) / state.canvas.zoom;
update_dynamic_stroke(state, context, {'x': x, 'y': y});
do_draw = true;
}
if (do_draw) {
window.requestAnimationFrame(() => draw(state, context));
}
}
function mouseup(e, state, context) {
if (state.spacedown) {
state.moving = false;
return;
}
if (state.drawing) {
const stroke = {
'color': Math.round(Math.random() * 4294967295),
'points': process_stroke(state.current_stroke.points)
};
add_static_stroke(state, context, stroke);
clear_dynamic_stroke(state, context);
state.drawing = false;
window.requestAnimationFrame(() => draw(state, context));
return;
}
}
function wheel(e, state, context) {
const x = Math.round((e.clientX - state.canvas.offset.x) / state.canvas.zoom);
const y = Math.round((e.clientY - state.canvas.offset.y) / state.canvas.zoom);
const dz = (e.deltaY < 0 ? 0.1 : -0.1);
const old_zoom = state.canvas.zoom;
state.canvas.zoom *= (1.0 + dz);
if (state.canvas.zoom > 100.0) {
state.canvas.zoom = old_zoom;
return;
}
if (state.canvas.zoom < 0.2) {
state.canvas.zoom = old_zoom;
return;
}
const zoom_offset_x = Math.round((dz * old_zoom) * x);
const zoom_offset_y = Math.round((dz * old_zoom) * y);
state.canvas.offset.x -= zoom_offset_x;
state.canvas.offset.y -= zoom_offset_y;
window.requestAnimationFrame(() => draw(state, context));
}

111
client/webgl_shaders.js
Unescape View File

@ -0,0 +1,111 @@ @@ -0,0 +1,111 @@
const vertex_shader_source = `
attribute vec2 a_pos;
attribute vec3 a_color;
uniform vec2 u_scale;
uniform vec2 u_res;
uniform vec2 u_translation;
uniform int u_layer;
varying vec3 v_color;
void main() {
vec2 screen01 = (a_pos * u_scale + u_translation) / u_res;
vec2 screen02 = screen01 * 2.0;
screen02.y = 2.0 - screen02.y;
vec2 screen11 = screen02 - 1.0;
v_color = a_color;
gl_Position = vec4(screen11, u_layer, 1);
}
`;
const fragment_shader_source = `
precision mediump float;
varying vec3 v_color;
void main() {
gl_FragColor = vec4(v_color, 1);
}
`;
function init_webgl(state, context) {
context.canvas = document.querySelector('#c');
context.gl = context.canvas.getContext('webgl', {
'preserveDrawingBuffer': true,
'desynchronized': true,
'antialias': true,
});
const vertex_shader = create_shader(context.gl, context.gl.VERTEX_SHADER, vertex_shader_source);
const fragment_shader = create_shader(context.gl, context.gl.FRAGMENT_SHADER, fragment_shader_source);
const program = create_program(context.gl, vertex_shader, fragment_shader)
context.program = program;
context.locations['a_pos'] = context.gl.getAttribLocation(program, 'a_pos');
context.locations['a_color'] = context.gl.getAttribLocation(program, 'a_color');
context.locations['u_res'] = context.gl.getUniformLocation(program, 'u_res');
context.locations['u_scale'] = context.gl.getUniformLocation(program, 'u_scale');
context.locations['u_translation'] = context.gl.getUniformLocation(program, 'u_translation');
context.locations['u_layer'] = context.gl.getUniformLocation(program, 'u_layer');
context.buffers['b_pos'] = context.gl.createBuffer();
context.buffers['b_color'] = context.gl.createBuffer();
const resize_canvas = (entries) => {
// https://www.khronos.org/webgl/wiki/HandlingHighDPI
const entry = entries[0];
let width;
let height;
if (entry.devicePixelContentBoxSize) {
width = entry.devicePixelContentBoxSize[0].inlineSize;
height = entry.devicePixelContentBoxSize[0].blockSize;
} else if (entry.contentBoxSize) {
// fallback for Safari that will not always be correct
width = Math.round(entry.contentBoxSize[0].inlineSize * devicePixelRatio);
height = Math.round(entry.contentBoxSize[0].blockSize * devicePixelRatio);
}
context.canvas.width = width;
context.canvas.height = height;
window.requestAnimationFrame(() => draw(state, context));
}
const resize_observer = new ResizeObserver(resize_canvas);
resize_observer.observe(context.canvas);
}
function create_shader(gl, type, source) {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
return shader;
}
console.error(type, ':', gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
}
function create_program(gl, vs, fs) {
const program = gl.createProgram();
gl.attachShader(program, vs);
gl.attachShader(program, fs);
gl.linkProgram(program);
if (gl.getProgramParameter(program, gl.LINK_STATUS)) {
return program;
}
console.error('link:', gl.getProgramInfoLog(program));
gl.deleteProgram(program);
}
Write Preview
Loading…
Cancel
Save