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<!-- vim: sw=2 ts=2 expandtab smartindent ft=javascript
-->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>WebGL Demo</title>
<style> document, body { margin: 0px; padding: 0px; overflow: hidden; } </style>
</head>
<body>
<canvas id="glcanvas"></canvas>
<script>
window.onload = () => {
const canvas = document.querySelector("#glcanvas");
const gl = canvas.getContext("webgl");
if (gl === null) {
alert(
"Unable to initialize WebGL. Your browser or machine may not support it."
);
return;
}
(window.onresize = () => {
gl.viewport(
0,
0,
canvas.width = window.innerWidth*window.devicePixelRatio,
canvas.height = window.innerHeight*window.devicePixelRatio
);
canvas.style.width = window.innerWidth + 'px';
canvas.style.height = window.innerHeight + 'px';
})();
const vsSource = `
attribute vec4 a_vpos;
attribute float a_palette_index;
varying float v_palette_index;
void main(void) {
v_palette_index = a_palette_index;
gl_Position = a_vpos;
}
`;
const fsSource = `
varying lowp float v_palette_index;
void main(void) {
gl_FragColor = vec4(1.0, 0.0, 1.0, 1.0);
if (0.0 == v_palette_index) gl_FragColor = vec4(0.8, 0.1, 0.1, 1.0);
if (1.0 == v_palette_index) gl_FragColor = vec4(0.1, 0.8, 0.1, 1.0);
if (2.0 == v_palette_index) gl_FragColor = vec4(0.1, 0.1, 0.8, 1.0);
if (3.0 == v_palette_index) gl_FragColor = vec4(1.0, 0.4, 0.4, 1.0);
if (4.0 == v_palette_index) gl_FragColor = vec4(0.4, 1.0, 0.4, 1.0);
if (5.0 == v_palette_index) gl_FragColor = vec4(0.4, 0.4, 1.0, 1.0);
// gl_FragColor *= 0.6;
}
`;
let shaderProgram;
{
let vsShader, fsShader;
{
vsShader = gl.createShader(gl.VERTEX_SHADER);
fsShader = gl.createShader(gl.FRAGMENT_SHADER);
/* compile shaders in parallel
* https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/WebGL_best_practices#compile_shaders_and_link_programs_in_parallel
* https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/WebGL_best_practices#dont_check_shader_compile_status_unless_linking_fails
*
* improvement:
* https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/WebGL_best_practices#prefer_khr_parallel_shader_compile
*/
gl.shaderSource(fsShader, fsSource);
gl.shaderSource(vsShader, vsSource);
gl.compileShader(fsShader);
gl.compileShader(vsShader);
}
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vsShader);
gl.attachShader(shaderProgram, fsShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
console.error(`Link failed: ${gl.getProgramInfoLog(shaderProgram)}`);
console.error(`vs info-log: ${gl.getShaderInfoLog(vsShader)}`);
console.error(`fs info-log: ${gl.getShaderInfoLog(fsShader)}`);
return;
}
}
const programInfo = {
program: shaderProgram,
a_vpos: gl.getAttribLocation(shaderProgram, "a_vpos"),
a_palette_index: gl.getAttribLocation(shaderProgram, "a_palette_index"),
};
const buffers = {
vrt: gl.createBuffer(),
col: gl.createBuffer(),
idx: gl.createBuffer(),
};
/* fill buffers */
{
gl.bindBuffer(gl.ARRAY_BUFFER, buffers.vrt);
gl.bufferData(gl.ARRAY_BUFFER, 8192, gl.DYNAMIC_DRAW);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffers.idx);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, 8192, gl.DYNAMIC_DRAW);
}
let camRotationX = 0;
let camRotationY = 0;
let mouse_x = 0;
let mouse_y = 0;
window.onmousemove = ev => {
if (ev.buttons > 0) {
camRotationX -= ev.movementX*0.01;
camRotationY -= ev.movementY*0.01;
}
mouse_x = ev.offsetX;
mouse_y = ev.offsetY;
}
let then = 0;
let deltaTime = 0;
requestAnimationFrame(function render(now) {
requestAnimationFrame(render);
now *= 0.001;
deltaTime = now - then;
then = now;
/* draw */
{
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clearDepth(1.0);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.blendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA);
gl.enable(gl.BLEND);
{
gl.bindBuffer(gl.ARRAY_BUFFER, buffers.vrt);
gl.vertexAttribPointer(
programInfo.a_vpos,
4, /* numComponents, */
gl.FLOAT, /* type, */
false, /* normalize, */
4*5, /* stride, */
0 /* offset */
);
gl.enableVertexAttribArray(programInfo.a_vpos);
gl.vertexAttribPointer(
programInfo.a_palette_index,
1, /* numComponents, */
gl.FLOAT, /* type, */
false, /* normalize, */
4*5, /* stride, */
4*4 /* offset */
);
gl.enableVertexAttribArray(programInfo.a_palette_index);
}
let vbuf, ibuf, ibuf_i;
{
const u_mvp = mat4_perspective(
mat4_create(),
(45 * Math.PI) / 180, /* fieldOfView */
gl.canvas.clientWidth / gl.canvas.clientHeight, /* aspect */
0.1, /* zNear */
100.0, /* zFar */
);
mat4_mul(
u_mvp,
u_mvp,
mat4_from_translation(mat4_create(), [0.0, 0.0, -4.0])
);
const m = mat4_create();
mat4_mul(
u_mvp,
u_mvp,
mat4_invert(m, mat4_from_zyx_rotation(m, camRotationY, camRotationX, 0))
);
let vbuf_i = 0;
ibuf_i = 0;
vbuf = new Float32Array(8192 / 4);
ibuf = new Uint16Array(8192 / 2);
function line(a, b, a_thick, b_thick, c, z_push=0) {
const aspect_ratio = gl.canvas.clientWidth / gl.canvas.clientHeight;
mat4_transform_vec4(a, a, u_mvp);
mat4_transform_vec4(b, b, u_mvp);
const dx = b[0] - a[0];
const dy = b[1] - a[1];
const nx = -dy; /* perp */
const ny = dx*aspect_ratio;
const tlen = Math.sqrt(nx*nx + ny*ny);
if (tlen <= 0) return;
let a_tx = nx/tlen * 0.5*a_thick / aspect_ratio;
let a_ty = ny/tlen * 0.5*a_thick;
let b_tx = nx/tlen * 0.5*b_thick / aspect_ratio;
let b_ty = ny/tlen * 0.5*b_thick;
ibuf[ibuf_i++] = 0 + vbuf_i/5;
ibuf[ibuf_i++] = 1 + vbuf_i/5;
ibuf[ibuf_i++] = 2 + vbuf_i/5;
ibuf[ibuf_i++] = 2 + vbuf_i/5;
ibuf[ibuf_i++] = 1 + vbuf_i/5;
ibuf[ibuf_i++] = 3 + vbuf_i/5;
a[2] += z_push;
b[2] += z_push;
vbuf[vbuf_i++] = a[0] + a_tx; vbuf[vbuf_i++] = a[1] + a_ty; vbuf[vbuf_i++] = a[2]; vbuf[vbuf_i++] = a[3]; vbuf[vbuf_i++] = c;
vbuf[vbuf_i++] = a[0] - a_tx; vbuf[vbuf_i++] = a[1] - a_ty; vbuf[vbuf_i++] = a[2]; vbuf[vbuf_i++] = a[3]; vbuf[vbuf_i++] = c;
vbuf[vbuf_i++] = b[0] + b_tx; vbuf[vbuf_i++] = b[1] + b_ty; vbuf[vbuf_i++] = b[2]; vbuf[vbuf_i++] = b[3]; vbuf[vbuf_i++] = c;
vbuf[vbuf_i++] = b[0] - b_tx; vbuf[vbuf_i++] = b[1] - b_ty; vbuf[vbuf_i++] = b[2]; vbuf[vbuf_i++] = b[3]; vbuf[vbuf_i++] = c;
}
function dist_to_center(a, b) {
const center = [
(a[0] + b[0]) * 0.5,
(a[1] + b[1]) * 0.5,
(a[2] + b[2]) * 0.5,
1
];
mat4_transform_vec4(center, center, u_mvp);
const w = center[3];
center[0] = (0 + (center[0]/w*0.5 + 0.5))*window.innerWidth;
center[1] = (1 - (center[1]/w*0.5 + 0.5))*window.innerHeight;
const dist = Math.sqrt((center[0] - mouse_x)*(center[0] - mouse_x) +
(center[1] - mouse_y)*(center[1] - mouse_y) );
return dist;
}
{
function gizmo(line) {
const LINE_BASE = 0.575;
const ARROW_BASE = 0.675;
const ARROW_TIP = 0.725;
const SCALE_P = 0.630;
let gizmo_i = 1;
/* lines */
{
line([LINE_BASE, 0, 0, 1], [ARROW_BASE, 0, 0, 1], 0.04, 0.04, RED, null);
line([ 0, LINE_BASE, 0, 1], [ 0, ARROW_BASE, 0, 1], 0.04, 0.04, GREEN, null);
line([ 0, 0, LINE_BASE, 1], [ 0, 0, ARROW_BASE, 1], 0.04, 0.04, BLUE, null);
}
/* translation arrows */
{
line([ARROW_TIP, 0, 0, 1], [ARROW_BASE, 0, 0, 1], 0.00, 0.10, RED, gizmo_i++);
line([ 0, ARROW_TIP, 0, 1], [ 0, ARROW_BASE, 0, 1], 0.00, 0.10, GREEN, gizmo_i++);
line([ 0, 0, ARROW_TIP, 1], [ 0, 0, ARROW_BASE, 1], 0.00, 0.10, BLUE, gizmo_i++);
}
/* scale boxes */
{
const S = 0.02;
line([SCALE_P-S, 0, 0, 1], [SCALE_P+S, 0, 0, 1], 0.10, 0.10, RED, gizmo_i++);
line([ 0, SCALE_P-S, 0, 1], [ 0, SCALE_P+S, 0, 1], 0.10, 0.10, GREEN, gizmo_i++);
line([ 0, 0, SCALE_P-S, 1], [ 0, 0, SCALE_P+S, 1], 0.10, 0.10, BLUE, gizmo_i++);
}
/* rotation arcs */
const RESOLUTION = 12;
for (let axis = 0; axis < 3; axis++) {
for (let i = 0; i < RESOLUTION; i++) {
const a_x = Math.cos((i - 0.01)/RESOLUTION * Math.PI*0.5)*LINE_BASE;
const a_y = Math.sin((i - 0.01)/RESOLUTION * Math.PI*0.5)*LINE_BASE;
const b_x = Math.cos((i + 1.01)/RESOLUTION * Math.PI*0.5)*LINE_BASE;
const b_y = Math.sin((i + 1.01)/RESOLUTION * Math.PI*0.5)*LINE_BASE;
if (axis == 0)
line([a_x, 0, a_y, 1],
[b_x, 0, b_y, 1], 0.04, 0.04, RED, gizmo_i + 0);
if (axis == 1)
line([0, a_x, a_y, 1],
[0, b_x, b_y, 1], 0.04, 0.04, BLUE, gizmo_i + 1);
if (axis == 2)
line([a_x, a_y, 0, 1],
[b_x, b_y, 0, 1], 0.04, 0.04, GREEN, gizmo_i + 2);
}
}
}
const RED = 0;
const GREEN = 1;
const BLUE = 2;
const SELECTED_RED = 3;
const SELECTED_GREEN = 4;
const SELECTED_BLUE = 5;
/* first pass - find closest */
let selected_i = -1;
let selected_dist = Infinity;
gizmo((a, b, a_thick, b_thick, color, i) => {
const dist = dist_to_center(a, b);
if (i && dist < selected_dist && dist < 30) {
selected_dist = dist;
selected_i = i;
}
});
/* second pass - draw */
gizmo((a, b, a_thick, b_thick, color, i) => {
const selected = (selected_i == i);
color += 3*selected;
const push = -0.01*selected;
line(a, b, a_thick, b_thick, color, push);
});
}
}
gl.bindBuffer(gl.ARRAY_BUFFER, buffers.vrt);
gl.bufferSubData(gl.ARRAY_BUFFER, 0, vbuf);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffers.idx);
gl.bufferSubData(gl.ELEMENT_ARRAY_BUFFER, 0, ibuf);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffers.idx);
gl.useProgram(programInfo.program);
gl.drawElements(
gl.TRIANGLES,
ibuf_i, /* vertexCount */
gl.UNSIGNED_SHORT, /* type */
0 /* offset */
);
}
})
}
function mat4_create() {
let out = new Float32Array(16);
out[0] = 1;
out[5] = 1;
out[10] = 1;
out[15] = 1;
return out;
}
function mat4_invert(out, a) {
let a00 = a[0],
a01 = a[1],
a02 = a[2],
a03 = a[3];
let a10 = a[4],
a11 = a[5],
a12 = a[6],
a13 = a[7];
let a20 = a[8],
a21 = a[9],
a22 = a[10],
a23 = a[11];
let a30 = a[12],
a31 = a[13],
a32 = a[14],
a33 = a[15];
let b00 = a00 * a11 - a01 * a10;
let b01 = a00 * a12 - a02 * a10;
let b02 = a00 * a13 - a03 * a10;
let b03 = a01 * a12 - a02 * a11;
let b04 = a01 * a13 - a03 * a11;
let b05 = a02 * a13 - a03 * a12;
let b06 = a20 * a31 - a21 * a30;
let b07 = a20 * a32 - a22 * a30;
let b08 = a20 * a33 - a23 * a30;
let b09 = a21 * a32 - a22 * a31;
let b10 = a21 * a33 - a23 * a31;
let b11 = a22 * a33 - a23 * a32;
/* Calculate the determinant */
let det =
b00 * b11 - b01 * b10 + b02 * b09 + b03 * b08 - b04 * b07 + b05 * b06;
if (!det) {
return null;
}
det = 1.0 / det;
out[0] = (a11 * b11 - a12 * b10 + a13 * b09) * det;
out[1] = (a02 * b10 - a01 * b11 - a03 * b09) * det;
out[2] = (a31 * b05 - a32 * b04 + a33 * b03) * det;
out[3] = (a22 * b04 - a21 * b05 - a23 * b03) * det;
out[4] = (a12 * b08 - a10 * b11 - a13 * b07) * det;
out[5] = (a00 * b11 - a02 * b08 + a03 * b07) * det;
out[6] = (a32 * b02 - a30 * b05 - a33 * b01) * det;
out[7] = (a20 * b05 - a22 * b02 + a23 * b01) * det;
out[8] = (a10 * b10 - a11 * b08 + a13 * b06) * det;
out[9] = (a01 * b08 - a00 * b10 - a03 * b06) * det;
out[10] = (a30 * b04 - a31 * b02 + a33 * b00) * det;
out[11] = (a21 * b02 - a20 * b04 - a23 * b00) * det;
out[12] = (a11 * b07 - a10 * b09 - a12 * b06) * det;
out[13] = (a00 * b09 - a01 * b07 + a02 * b06) * det;
out[14] = (a31 * b01 - a30 * b03 - a32 * b00) * det;
out[15] = (a20 * b03 - a21 * b01 + a22 * b00) * det;
return out;
}
const _scratch = mat4_create();
function mat4_from_zyx_rotation(out, x, y, z) {
mat4_from_z_rotation(out, z);
mat4_from_y_rotation(_scratch, y);
mat4_mul(out, out, _scratch);
mat4_from_x_rotation(_scratch, x);
mat4_mul(out, out, _scratch);
return out;
}
function mat4_from_x_rotation(out, rad) {
let s = Math.sin(rad);
let c = Math.cos(rad);
/* Perform axis-specific matrix multiplication */
out[0] = 1;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = c;
out[6] = s;
out[7] = 0;
out[8] = 0;
out[9] = -s;
out[10] = c;
out[11] = 0;
out[12] = 0;
out[13] = 0;
out[14] = 0;
out[15] = 1;
return out;
}
function mat4_from_y_rotation(out, rad) {
let s = Math.sin(rad);
let c = Math.cos(rad);
/* Perform axis-specific matrix multiplication */
out[0] = c;
out[1] = 0;
out[2] = -s;
out[3] = 0;
out[4] = 0;
out[5] = 1;
out[6] = 0;
out[7] = 0;
out[8] = s;
out[9] = 0;
out[10] = c;
out[11] = 0;
out[12] = 0;
out[13] = 0;
out[14] = 0;
out[15] = 1;
return out;
}
function mat4_from_z_rotation(out, rad) {
let s = Math.sin(rad);
let c = Math.cos(rad);
/* Perform axis-specific matrix multiplication */
out[0] = c;
out[1] = s;
out[2] = 0;
out[3] = 0;
out[4] = -s;
out[5] = c;
out[6] = 0;
out[7] = 0;
out[8] = 0;
out[9] = 0;
out[10] = 1;
out[11] = 0;
out[12] = 0;
out[13] = 0;
out[14] = 0;
out[15] = 1;
return out;
}
function mat4_from_translation(out, v) {
out[0] = 1;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = 1;
out[6] = 0;
out[7] = 0;
out[8] = 0;
out[9] = 0;
out[10] = 1;
out[11] = 0;
out[12] = v[0];
out[13] = v[1];
out[14] = v[2];
out[15] = 1;
return out;
}
function mat4_mul(out, a, b) {
let a00 = a[0], a01 = a[1], a02 = a[2], a03 = a[3];
let a10 = a[4], a11 = a[5], a12 = a[6], a13 = a[7];
let a20 = a[8], a21 = a[9], a22 = a[10], a23 = a[11];
let a30 = a[12], a31 = a[13], a32 = a[14], a33 = a[15];
/* Cache only the current line of the second matrix */
let b0 = b[0],
b1 = b[1],
b2 = b[2],
b3 = b[3];
out[0] = b0 * a00 + b1 * a10 + b2 * a20 + b3 * a30;
out[1] = b0 * a01 + b1 * a11 + b2 * a21 + b3 * a31;
out[2] = b0 * a02 + b1 * a12 + b2 * a22 + b3 * a32;
out[3] = b0 * a03 + b1 * a13 + b2 * a23 + b3 * a33;
b0 = b[4];
b1 = b[5];
b2 = b[6];
b3 = b[7];
out[4] = b0 * a00 + b1 * a10 + b2 * a20 + b3 * a30;
out[5] = b0 * a01 + b1 * a11 + b2 * a21 + b3 * a31;
out[6] = b0 * a02 + b1 * a12 + b2 * a22 + b3 * a32;
out[7] = b0 * a03 + b1 * a13 + b2 * a23 + b3 * a33;
b0 = b[8];
b1 = b[9];
b2 = b[10];
b3 = b[11];
out[8] = b0 * a00 + b1 * a10 + b2 * a20 + b3 * a30;
out[9] = b0 * a01 + b1 * a11 + b2 * a21 + b3 * a31;
out[10] = b0 * a02 + b1 * a12 + b2 * a22 + b3 * a32;
out[11] = b0 * a03 + b1 * a13 + b2 * a23 + b3 * a33;
b0 = b[12];
b1 = b[13];
b2 = b[14];
b3 = b[15];
out[12] = b0 * a00 + b1 * a10 + b2 * a20 + b3 * a30;
out[13] = b0 * a01 + b1 * a11 + b2 * a21 + b3 * a31;
out[14] = b0 * a02 + b1 * a12 + b2 * a22 + b3 * a32;
out[15] = b0 * a03 + b1 * a13 + b2 * a23 + b3 * a33;
return out;
}
function mat4_transform_vec4(out, a, m) {
let x = a[0], y = a[1], z = a[2], w = a[3];
out[0] = m[0] * x + m[4] * y + m[8] * z + m[12] * w;
out[1] = m[1] * x + m[5] * y + m[9] * z + m[13] * w;
out[2] = m[2] * x + m[6] * y + m[10] * z + m[14] * w;
out[3] = m[3] * x + m[7] * y + m[11] * z + m[15] * w;
return out;
}
function mat4_perspective(out, fovy, aspect, near, far) {
let f = 1.0 / Math.tan(fovy / 2),
nf;
out[0] = f / aspect;
out[1] = 0;
out[2] = 0;
out[3] = 0;
out[4] = 0;
out[5] = f;
out[6] = 0;
out[7] = 0;
out[8] = 0;
out[9] = 0;
out[11] = -1;
out[12] = 0;
out[13] = 0;
out[15] = 0;
if (far != null && far !== Infinity) {
nf = 1 / (near - far);
out[10] = (far + near) * nf;
out[14] = 2 * far * near * nf;
} else {
out[10] = -1;
out[14] = -2 * near;
}
return out;
}
</script>
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