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example3.html
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example3.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width">
<title></title>
<style> html, body, canvas { display: block; position: relative; margin: 0; padding: 0; } </style>
</head>
<body onload='init()'>
<canvas id='maincanvas' />
</body>
<script type="text/javascript" src="node_modules/gl-matrix/dist/gl-matrix-min.js"></script>
<script type="text/javascript" src="shared.js"></script>
<script type="text/javascript" src="icosahedron.js"></script>
<script type="text/glsl" id='vertShader'>
precision highp float; // Not necessary, but makes it explicit
uniform mat4 u_projectionMatrix;
uniform mat4 u_modelWorldMatrix;
uniform mat4 u_modelWorldMatrix_IT;
uniform mat4 u_worldViewMatrix;
attribute vec3 a_position;
attribute vec3 a_normal;
attribute vec4 a_color;
varying vec3 v_position;
varying vec3 v_normal;
varying vec4 v_color;
void main() {
vec3 vertexWorldPosition = (u_modelWorldMatrix * vec4(a_position, 1)).xyz;
gl_Position = u_projectionMatrix * u_worldViewMatrix * vec4(vertexWorldPosition, 1);
v_position = vertexWorldPosition;
v_normal = (u_modelWorldMatrix_IT * vec4(a_normal, 1)).xyz;
v_color = a_color;
}
</script>
<script type="text/glsl" id='fragShader'>
precision highp float;
uniform vec3 u_lightWorldPosition;
varying vec3 v_position;
varying vec3 v_normal;
varying vec4 v_color;
void main() {
vec3 n_normal = normalize(v_normal);
vec3 tocamera = normalize(u_lightWorldPosition - v_position);
// gl_FragColor = vec4(clamp(v_normal, 0.1, 1.0), 1.0);
// gl_FragColor = v_color * vec4(v_normal, 1);
// gl_FragColor = vec4(v_position, 1.0);
float incidence = dot(tocamera, n_normal);
gl_FragColor = vec4(pow(clamp(incidence, 0., 1.), 2.5) * v_color.rgb, 1.);
}
</script>
<script>
'use strict';
// Be forewarned: OpenGL LOVES global variables and state
const gl = getWebGLContext(document.getElementById('maincanvas'));
const exampleShader = compileShaderProgram('vertShader', 'fragShader');
const viewMatrices = {};
const theEarth = postProcessIcoMesh(icosphere(5));
const theMoon = postProcessIcoMesh(icosphere(0));
const earthShader = exampleShader;
const moonShader = exampleShader;
function postProcessIcoMesh(complex) {
let vertices = complex.positions;
let faceIndices = complex.cells;
let expandedPositions = [];
let normals = [];
let colors = [];
faceIndices.forEach((face, idx) => {
let v0 = vec3.clone(vertices[face[0]]);
let v1 = vec3.clone(vertices[face[1]]);
let v2 = vec3.clone(vertices[face[2]]);
expandedPositions.push(v0, v1, v2);
let side1 = vec3.sub(vec3.create(), v1, v0);
let side2 = vec3.sub(vec3.create(), v2, v0);
let normal = vec3.cross(vec3.create(), side1, side2);
normals.push(normal, normal, normal);
// normals.push(v0, v1, v2);
let c0 = randRGBInt();
let c1 = randRGBInt();
let c2 = randRGBInt();
// Flat color shading, since all vertices have the same color
c0 = c1 = c2;
colors.push(c0, c1, c2);
});
for (var idx = 0; idx < normals.length; ++idx) {
let nrml = normals[idx];
vec3.normalize(nrml, nrml);
}
let numVertexElements = 3;
let numNormalElements = 3;
let numColorElements = 4;
let verticesData = flatten2Buffer(expandedPositions, numVertexElements);
let normalsData = flatten2Buffer(normals, numNormalElements);
let colorsData = flatten2UIntBuffer(colors, numColorElements);
return {
// Mesh information
numVertices: expandedPositions.length,
modelPosition: vec3.create(),
modelRotationMatrix: mat4.create(),
modelScale: vec3.fromValues(1, 1, 1),
// Buffers and buffer information
verticesBuffer: prepareGLBuffer(verticesData, gl.STATIC_DRAW),
verticesBufferUnitCount: numVertexElements,
verticesBufferType: gl.FLOAT,
verticesBufferStride: verticesData.BYTES_PER_ELEMENT * numVertexElements,
verticesBufferOffset: 0,
normalsBuffer: prepareGLBuffer(normalsData, gl.STATIC_DRAW),
normalsBufferUnitCount: numNormalElements,
normalsBufferType: gl.FLOAT,
normalsBufferStride: normalsData.BYTES_PER_ELEMENT * numNormalElements,
normalsBufferOffset: 0,
colorsBuffer: prepareGLBuffer(colorsData, gl.STATIC_DRAW),
colorsBufferUnitCount: numColorElements,
colorsBufferType: gl.UNSIGNED_BYTE,
colorsBufferStride: colorsData.BYTES_PER_ELEMENT * numColorElements,
colorsBufferOffset: 0
};
}
function getModelMatrix(modelMesh) {
let combinedMatrix = mat4.create();
mat4.translate(combinedMatrix, combinedMatrix, modelMesh.modelPosition);
mat4.multiply(combinedMatrix, combinedMatrix, modelMesh.modelRotationMatrix);
mat4.scale(combinedMatrix, combinedMatrix, modelMesh.modelScale);
return combinedMatrix;
}
function setup() {
let innerWidth = window.innerWidth;
let innerHeight = window.innerHeight;
let pixelRatio = getPixelRatio();
let canvasWidth = innerWidth * pixelRatio;
let canvasHeight = innerHeight * pixelRatio;
gl.canvas.width = canvasWidth;
gl.canvas.height = canvasHeight;
gl.canvas.style.width = innerWidth + 'px';
gl.canvas.style.height = innerHeight + 'px';
gl.viewport(0, 0, canvasWidth, canvasHeight);
gl.clearColor(0, 0, 0, 1);
gl.enable(gl.CULL_FACE);
gl.enable(gl.DEPTH_TEST);
gl.frontFace(gl.CCW);
viewMatrices.projectionMatrix = mat4.perspective(mat4.create(), deg2Rad(25), canvasWidth / canvasHeight, 0.01, 50);
viewMatrices.cameraPosition = vec3.fromValues(0, 0, 9);
viewMatrices.cameraTarget = vec3.fromValues(0, 0, 0);
viewMatrices.cameraUp = vec3.fromValues(0, 1, 0);
viewMatrices.viewMatrix = mat4.lookAt(mat4.create(), viewMatrices.cameraPosition, viewMatrices.cameraTarget, viewMatrices.cameraUp);
theMoon.modelScale = vec3.fromValues(0.2, 0.2, 0.2);
}
function draw() {
// Animation
theMoon.modelPosition[0] = 3 * cos(0.001 * elapsedTime());
theMoon.modelPosition[2] = 3 * sin(0.001 * elapsedTime());
mat4.rotateY(theMoon.modelRotationMatrix, theMoon.modelRotationMatrix, 0.006 * PI);
mat4.rotateY(theEarth.modelRotationMatrix, theEarth.modelRotationMatrix, -0.003 * PI);
// Drawing
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
// Misc variables used below
let lightPosLoc;
let projMatLoc;
let viewMatLoc;
let modelMatrix;
let modelMatLoc;
let modelMatrixIT;
let modelMatITLoc;
let posLoc;
let normLoc;
let colorLoc;
let lightPosition = vec3.add(vec3.create(), viewMatrices.cameraPosition, vec3.fromValues(4, 10, 4));
// Draw the Earth
gl.useProgram(earthShader);
lightPosLoc = gl.getUniformLocation(earthShader, 'u_lightWorldPosition');
gl.uniform3fv(lightPosLoc, lightPosition);
projMatLoc = gl.getUniformLocation(earthShader, 'u_projectionMatrix');
gl.uniformMatrix4fv(projMatLoc, false, viewMatrices.projectionMatrix);
viewMatLoc = gl.getUniformLocation(earthShader, 'u_worldViewMatrix');
gl.uniformMatrix4fv(viewMatLoc, false, viewMatrices.viewMatrix);
modelMatrix = getModelMatrix(theEarth);
modelMatLoc = gl.getUniformLocation(earthShader, 'u_modelWorldMatrix');
gl.uniformMatrix4fv(modelMatLoc, false, modelMatrix);
modelMatrixIT = mat4.transpose(mat4.create(), mat4.invert(mat4.create(), modelMatrix));
modelMatITLoc = gl.getUniformLocation(earthShader, 'u_modelWorldMatrix_IT');
gl.uniformMatrix4fv(modelMatITLoc, false, modelMatrixIT);
posLoc = gl.getAttribLocation(earthShader, 'a_position');
gl.enableVertexAttribArray(posLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, theEarth.verticesBuffer);
gl.vertexAttribPointer(posLoc, theEarth.verticesBufferUnitCount, theEarth.verticesBufferType, false, theEarth.verticesBufferStride, theEarth.verticesBufferOffset);
normLoc = gl.getAttribLocation(earthShader, 'a_normal');
gl.enableVertexAttribArray(normLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, theEarth.normalsBuffer);
gl.vertexAttribPointer(normLoc, theEarth.normalsBufferUnitCount, theEarth.normalsBufferType, false, theEarth.normalsBufferStride, theEarth.normalsBufferOffset);
colorLoc = gl.getAttribLocation(earthShader, 'a_color');
gl.enableVertexAttribArray(colorLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, theEarth.colorsBuffer);
gl.vertexAttribPointer(colorLoc, theEarth.colorsBufferUnitCount, theEarth.colorsBufferType, true, theEarth.colorsBufferStride, theEarth.colorsBufferOffset);
gl.drawArrays(gl.TRIANGLES, 0, theEarth.numVertices);
// Draw the Moon
gl.useProgram(moonShader);
lightPosLoc = gl.getUniformLocation(moonShader, 'u_lightWorldPosition');
gl.uniform3fv(lightPosLoc, lightPosition);
projMatLoc = gl.getUniformLocation(moonShader, 'u_projectionMatrix');
gl.uniformMatrix4fv(projMatLoc, false, viewMatrices.projectionMatrix);
viewMatLoc = gl.getUniformLocation(moonShader, 'u_worldViewMatrix');
gl.uniformMatrix4fv(viewMatLoc, false, viewMatrices.viewMatrix);
modelMatrix = getModelMatrix(theMoon);
modelMatLoc = gl.getUniformLocation(moonShader, 'u_modelWorldMatrix');
gl.uniformMatrix4fv(modelMatLoc, false, modelMatrix);
modelMatrixIT = mat4.transpose(mat4.create(), mat4.invert(mat4.create(), modelMatrix));
modelMatITLoc = gl.getUniformLocation(moonShader, 'u_modelWorldMatrix_IT');
gl.uniformMatrix4fv(modelMatITLoc, false, modelMatrixIT);
posLoc = gl.getAttribLocation(moonShader, 'a_position');
gl.enableVertexAttribArray(posLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, theMoon.verticesBuffer);
gl.vertexAttribPointer(posLoc, theMoon.verticesBufferUnitCount, theMoon.verticesBufferType, false, theMoon.verticesBufferStride, theMoon.verticesBufferOffset);
normLoc = gl.getAttribLocation(moonShader, 'a_normal');
gl.enableVertexAttribArray(normLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, theMoon.normalsBuffer);
gl.vertexAttribPointer(normLoc, theMoon.normalsBufferUnitCount, theMoon.normalsBufferType, false, theMoon.normalsBufferStride, theMoon.normalsBufferOffset);
colorLoc = gl.getAttribLocation(moonShader, 'a_color');
gl.enableVertexAttribArray(colorLoc);
gl.bindBuffer(gl.ARRAY_BUFFER, theMoon.colorsBuffer);
gl.vertexAttribPointer(colorLoc, theMoon.colorsBufferUnitCount, theMoon.colorsBufferType, true, theMoon.colorsBufferStride, theMoon.colorsBufferOffset);
gl.drawArrays(gl.TRIANGLES, 0, theMoon.numVertices);
}
function prepareGLBuffer(bufferData, bufferUsage) {
let bufferId = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, bufferId);
gl.bufferData(gl.ARRAY_BUFFER, bufferData, bufferUsage);
gl.bindBuffer(gl.ARRAY_BUFFER, null);
return bufferId;
}
function init() {
let loop = () => { draw(), requestAnimationFrame(loop); }
// Setup once, then infinite draw
setup();
loop();
}
</script>
</html>