s2maps-gpu/dist/gl/workflows/loadShader.js

S2 Maps GPU - An open source, high-performance, and GPU-accelerated map engine for rendering large-scale, interactive maps.

/**
 * Load a WebGL shader
 * @param gl - WebGL or WebGL2 rendering context
 * @param shaderSource - shader source code
 * @param shaderType - shader type
 * @returns the compiled shader
 */
export default function loadShader(gl, shaderSource, shaderType) {
    // Create the shader object
    const shader = gl.createShader(shaderType);
    if (shader === null)
        throw Error(`Failed to create shader : ${shaderSource}`);
    // Load the shader source
    gl.shaderSource(shader, shaderSource);
    // Compile the shader
    gl.compileShader(shader);
    // Check the compile status
    const compiled = gl.getShaderParameter(shader, gl.COMPILE_STATUS);
    if (compiled === null) {
        // Something went wrong during compilation get the error
        const lastError = gl.getShaderInfoLog(shader);
        gl.deleteShader(shader);
        throw Error(`*** Error compiling shader '${JSON.stringify(shader)}': ${lastError ?? 'unknown'}`);
    }
    return shader;
}