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import { System } from '@serpentity/serpentity';
import Drawable from '../nodes/drawable';
import { initializeShaderProgram, initializeBuffers } from '../webgl_utils';
const internals = {
kWidthRatio: 2.76,
kHeightRatio: 1,
kTargetVerticalResolution: 32 + Math.round(Math.random() * 1024),
kVertexShader: `
attribute vec3 aVertexPosition;
void main() {
gl_Position = vec4(aVertexPosition.xy, 0.0, 1.0);
gl_PointSize = 10.0; // Set the point size
}
`,
kFragmentShader: `
precision mediump float;
uniform vec4 uColor;
void main() {
gl_FragColor = uColor;
}
`
};
export default class WebGLRenderer extends System {
constructor(canvasId) {
super();
this.canvasId = canvasId;
}
added(engine){
// Set up canvas
const canvas = document.getElementById(this.canvasId);
window.addEventListener('resize', () => this._resizeCanvas(canvas));
// Set up WebGL
const gl = canvas.getContext('webgl', {
preserveDrawingBuffer: true
});
this.gl = gl;
const shaderProgram = initializeShaderProgram(
gl,
internals.kVertexShader,
internals.kFragmentShader
);
this.programInfo = {
program: shaderProgram,
attribLocations: {
vertexPosition: gl.getAttribLocation(shaderProgram, 'aVertexPosition')
},
uniformLocations: {
color: gl.getUniformLocation(shaderProgram, 'uColor')
}
};
this.buffers = initializeBuffers(gl);
this._resizeCanvas(canvas);
this.points = engine.getNodes(Drawable);
}
removed(engine){
this.points = undefined;
}
update(){
const {gl, programInfo, buffers} = this;
gl.useProgram(programInfo.program);
{
const color = [1, 1, 1, 1];
gl.uniform4fv(programInfo.uniformLocations.color, color);
}
const positions = [];
for (const point of this.points) {
positions.push(point.position.x, point.position.y, point.position.z);
positions.push(
point.position.prevX || point.position.x,
point.position.prevY || point.position.y,
point.position.prevZ || point.position.z
);
point.position.prevX = point.position.x;
point.position.prevY = point.position.y;
point.position.prevZ = point.position.z;
}
gl.bindBuffer(gl.ARRAY_BUFFER, buffers.position);
gl.bufferData(gl.ARRAY_BUFFER,
new Float32Array(positions),
gl.STATIC_DRAW);
{
const numberOfComponents = 3;
const type = gl.FLOAT;
const normalize = false;
const stride = 0;
const offset = 0;
gl.bindBuffer(gl.ARRAY_BUFFER, buffers.position);
gl.vertexAttribPointer(
programInfo.attribLocations.vertexPosition,
numberOfComponents,
type,
normalize,
stride,
offset
);
gl.enableVertexAttribArray(programInfo.attribLocations.vertexPosition);
}
{
gl.lineWidth(2);
gl.drawArrays(gl.LINES, 0, this.points.nodes.length * 2);
}
}
_resizeCanvas(canvas) {
console.log('Resizing Canvas');
let width = window.innerWidth;
let height = Math.round(width * internals.kHeightRatio / internals.kWidthRatio);
if (window.innerHeight < height) {
height = window.innerHeight;
width = Math.round(height * internals.kWidthRatio / internals.kHeightRatio);
console.log(width, height);
}
canvas.style.width = `${width}px`;
canvas.style.height = `${height}px`;
canvas.width = internals.kTargetVerticalResolution * internals.kWidthRatio;
canvas.height = internals.kTargetVerticalResolution;
this.gl.viewport(0, 0, canvas.width, canvas.height);
}
};
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