74 lines
1.8 KiB
JavaScript
74 lines
1.8 KiB
JavaScript
export class Shader {
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constructor(gl) {
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this.gl = gl;
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this.program = gl.createProgram();
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this.startTime = Date.now();
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}
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attach(type, source) {
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console.log("attaching shader", { type, source });
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const shader = this.gl.createShader(type);
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this.gl.shaderSource(shader, source);
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this.gl.compileShader(shader);
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if (!this.gl.getShaderParameter(shader, this.gl.COMPILE_STATUS)) {
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throw new Error(
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"An error occurred compiling the shaders: " +
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this.gl.getShaderInfoLog(shader)
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);
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}
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this.gl.attachShader(this.program, shader);
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return this;
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}
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link() {
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this.gl.linkProgram(this.program);
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if (!this.gl.getProgramParameter(this.program, this.gl.LINK_STATUS)) {
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throw new Error(
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"Unable to initialize the shader program: " +
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this.gl.getProgramInfoLog(this.program)
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);
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}
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console.log("shader linked");
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return this;
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}
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location(name) {
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if (name[0] === "a") {
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return this.gl.getAttribLocation(this.program, name);
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} else if (name[0] === "u") {
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return this.gl.getUniformLocation(this.program, name);
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}
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}
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updateTime() {
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const now = Date.now();
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const time = now - this.startTime;
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const sinTime = Math.sin(time);
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const cosTime = Math.cos(time);
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this.gl.uniform1f(this.location("uTime"), time);
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this.gl.uniform1f(this.location("uSinTime"), sinTime);
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this.gl.uniform1f(this.location("uCosTime"), cosTime);
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}
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activate(projectionMatrix, modelViewMatrix) {
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this.gl.useProgram(this.program);
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this.gl.uniformMatrix4fv(
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this.location("uProjectionMatrix"),
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false,
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projectionMatrix
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);
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this.gl.uniformMatrix4fv(
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this.location("uModelViewMatrix"),
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false,
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modelViewMatrix
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);
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this.updateTime();
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}
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}
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