render-utils.js

class RenderUtils {
    static createShader(gl, type, source) {
        var shader = gl.createShader(type);
        gl.shaderSource(shader, source);
        gl.compileShader(shader);
        var success = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
        if (success) {
            return shader;
        }

        console.log(gl.getShaderInfoLog(shader));
        gl.deleteShader(shader);
    }

    static createProgram(gl, vertexShader, fragmentShader) {
        var program = gl.createProgram();
        gl.attachShader(program, vertexShader);
        gl.attachShader(program, fragmentShader);
        gl.linkProgram(program);
        var success = gl.getProgramParameter(program, gl.LINK_STATUS);
        if (success) {
            return program;
        }

        console.log(gl.getProgramInfoLog(program));
        gl.deleteProgram(program);
    }


    static initializeCanvas(canvasID) {
        var canvas = document.getElementById(canvasID);
        var gl = canvas.getContext("webgl");
        
        return gl;
    }

    static clearCanvas(gl) {
        gl.clearColor(0, 0, 0, 1);
        gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
    }
}