//////////////////////////////////////////////////////////////////////////////////////////
//
// THIS IS THE SUPPORT LIBRARY. YOU PROBABLY DON'T WANT TO CHANGE ANYTHING HERE JUST YET.
//
//////////////////////////////////////////////////////////////////////////////////////////
let fragmentShaderHeader = ['' // WHATEVER CODE WE WANT TO PREDEFINE FOR FRAGMENT SHADERS
, 'precision highp float;'
, 'float noise(vec3 point) { float r = 0.; for (int i=0;i<16;i++) {'
, ' vec3 D, p = point + mod(vec3(i,i/4,i/8) , vec3(4.0,2.0,2.0)) +'
, ' 1.7*sin(vec3(i,5*i,8*i)), C=floor(p), P=p-C-.5, A=abs(P);'
, ' C += mod(C.x+C.y+C.z,2.) * step(max(A.yzx,A.zxy),A) * sign(P);'
, ' D=34.*sin(987.*float(i)+876.*C+76.*C.yzx+765.*C.zxy);P=p-C-.5;'
, ' r+=sin(6.3*dot(P,fract(D)-.5))*pow(max(0.,1.-2.*dot(P,P)),4.);'
, '} return .5 * sin(r); }'
].join('\n');
var ns = 0, cns = 0;
fragmentShaderHeader+= 'const int ns = ' + ns + ';\n';
var fragmentShaderDefs = 'const int cns = ' + cns + ';\n';
let nfsh = fragmentShaderHeader.split('\n').length + 1; // NUMBER OF LINES OF CODE IN fragmentShaderHeader
let isFirefox = navigator.userAgent.indexOf('Firefox') > 0;
function getBlob(data) {
let bytes = new Array(data.length);
for (let i = 0; i < data.length; i++) {
bytes[i] = data.charCodeAt(i);
}
return new Blob([new Uint8Array(bytes)]);
}
let texture = [], gl, program;
let textures = [];
let lock = false;
function loadTexture(gl, url, i) {
const level = 0;
const internalFormat = gl.RGBA;
const width = 1;
const height = 1;
const border = 0;
const srcFormat = gl.RGBA;
const srcType = gl.UNSIGNED_BYTE;
if (texture[i] == null)
{
texture[i] = gl.createTexture();
const pixel = new Uint8Array([0, 0, 255, 255]); // opaque blue
gl.activeTexture(gl.TEXTURE0+i);
gl.bindTexture(gl.TEXTURE_2D, texture[i]);
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
width, height, border, srcFormat, srcType,
pixel);
}
const image = new Image();
image.onload = function () {
gl.activeTexture(gl.TEXTURE0+i);
gl.bindTexture(gl.TEXTURE_2D, texture[i]);
gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
srcFormat, srcType, image);
if (isPowerOf2(image.width) && isPowerOf2(image.height)) {
gl.generateMipmap(gl.TEXTURE_2D);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
} else {
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
}
};
image.src = url;
}
function isPowerOf2(value) {
return (value & (value - 1)) == 0;
}
function gl_start(canvas, vertexShader, fragmentShader) { // START WEBGL RUNNING IN A CANVAS
console.log('glstart');
setTimeout(function () {
try {
canvas.gl = canvas.getContext('experimental-webgl'); // Make sure WebGl is supported. IT WOULD BE GREAT TO USE WEBGL2 INSTEAD.
} catch (e) { throw 'Sorry, your browser does not support WebGL.'; }
canvas.setShaders = function (vertexShader, fragmentShader) { // Add the vertex and fragment shaders:
gl = this.gl;
program = gl.createProgram(); // Create the WebGL program.
function addshader(type, src) { // Create and attach a WebGL shader.
function spacer(color, width, height) {
return '<table bgcolor=' + color +
' width=' + width +
' height=' + height + '><tr><td> </td></tr></table>';
}
errorMessage.innerHTML = 'In Spring Break We Did Homeworks.';
// errorMarker.innerHTML = spacer('white', 1, 1) + '<font size=1 color=white>\u25B6</font>';
let shader = gl.createShader(type);
gl.shaderSource(shader, src);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
let msg = gl.getShaderInfoLog(shader);
console.log('Cannot compile shader:\n\n' + msg);
let a = msg.substring(6, msg.length);
let line = 0;
if (a.substring(0, 3) == ' 0:') {
a = a.substring(3, a.length);
line = parseInt(a) - nfsh;
editor.session.setAnnotations([{
row: line,
column: 0,
text: msg,
type: "error"
}]);
}
let j = a.indexOf(':');
a = 'line ' + (line+1) + a.substring(j, a.length);
if ((j = a.indexOf('\n')) > 0)
a = a.substring(0, j);
errorMessage.innerHTML = a;
}
else
editor.session.clearAnnotations();
gl.attachShader(program, shader);
};
addshader(gl.VERTEX_SHADER, vertexShader); // Add the vertex and fragment shaders.
addshader(gl.FRAGMENT_SHADER, fragmentShaderHeader +fragmentShaderDefs+ fragmentShader);
gl.linkProgram(program); // Link the program, report any errors.
if (!gl.getProgramParameter(program, gl.LINK_STATUS))
console.log('Could not link the shader program!');
gl.useProgram(program);
gl.program = program;
for(let i = 0; i < ns; ++i){
loadTexture(gl, './'+(i+1)+'.jpg', i); //Texture loading.
textures[i] = i;
}
gl.uniform1iv(gl.getUniformLocation(program, 'uSampler'), textures);
positionsupdated = true;
let attribs = [
.05,.05,.1, .5,.5,1., 1.,.5,.5,20., 0., .0, 1.3,
.1,.05,.05, 1.,.5,.5, 1.,.5,.5,10., .3,1.,1.3,
.1,.05,.05, .71,.71,.71, .71,.71,.71,10., 0.3,.0,1.5,
.1,.1,.1, .71,.71,.71, .71,.71,.71,10., 0.05,0., 1.,
.0,.0,.0, .0,.0,.0, .0,.0,.0,40., 0.,.85,1.5
]
var offset = 0;
for(let i = 0; i < ns; i++){
setUniform('3fv', 'Ambient['+i+']', attribs.slice(offset, offset += 3));
setUniform('3fv', 'Diffuse['+i+']', attribs.slice(offset, offset += 3));
setUniform('4fv', 'Specular['+i+']', attribs.slice(offset, offset += 4));
setUniform('1fv', 'ks['+i+']', attribs.slice(offset, offset += 1));
setUniform('1fv', 'kr['+i+']', attribs.slice(offset, offset += 1));
setUniform('1fv', 'kf['+i+']', attribs.slice(offset, offset += 1));
}
offset = 0;
for(let i = 0; i < n_shapes; i++){
setUniform('3fv', 'starColors['+i+']', starColors.slice(offset, offset += 3));
}
gl.bindBuffer(gl.ARRAY_BUFFER, gl.createBuffer()); // Create a square as a triangle strip
// gl.bufferData(gl.ARRAY_BUFFER, new Float32Array( // consisting of two triangles.
// [-1, 1, 0, 1, 1, 0, -1, -1, 0, 1, -1, 0]), gl.STATIC_DRAW);
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);
gl.clearDepth(-1);
let oid = gl.getAttribLocation(program, 'oid'); // Set aPos attribute for each vertex.
gl.enableVertexAttribArray(oid);
gl.vertexAttribPointer(oid, 1, gl.FLOAT, false, 4*7, 0);
let aPos = gl.getAttribLocation(program, 'aPos'); // Set aPos attribute for each vertex.
gl.enableVertexAttribArray(aPos);
gl.vertexAttribPointer(aPos, 3, gl.FLOAT, false, 4*7, 4);
let normal = gl.getAttribLocation(program, 'normal'); // Set aPos attribute for each vertex.
gl.enableVertexAttribArray(normal);
gl.vertexAttribPointer(normal, 3, gl.FLOAT, false, 4*7, 4*4);
}
canvas.setShaders(vertexShader, fragmentShader); // Initialize everything,
setInterval(function () { // Start the animation loop.
gl = canvas.gl;
if (gl.startTime === undefined) // First time through,
gl.startTime = Date.now(); // record the start time.
animate(gl);
//gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); // Render the square.
}, 30);
}, 100); // Wait 100 milliseconds after page has loaded before starting WebGL.
}
// THE animate() CALLBACK FUNCTION CAN BE REDEFINED IN index.html.
function animate() { }
function setUniform(type, name, a, b, c, d, e, f) {
if(gl)
{
let loc = gl.getUniformLocation(gl.program, name);
(gl['uniform' + type])(loc, a, b, c, d, e, f);
}
}
//let VERTEX_SIZE = 3;
let VERTEX_SIZE = 7;
let drawMesh = (mesh, func = gl.TRIANGLE_STRIP) => {
gl.bufferData(gl.ARRAY_BUFFER, mesh, gl.STATIC_DRAW);
gl.drawArrays(func, 0, mesh.length / VERTEX_SIZE);
}