// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
/**
 * Shader selection
 * @param device
 * @param props
 * @returns
 */
export function selectShaders(props) {
    // If we have a source field, we have a single unified shader source
    if (props.source && props.platformInfo.type === 'webgpu') {
        const propsCopy = { ...props, vs: undefined, fs: undefined };
        return propsCopy;
    }
    if (!props.vs) {
        throw new Error('no vertex shader');
    }
    // Resolve WGSL vs GLSL
    const vs = getShaderSource(props.platformInfo, props.vs);
    let fs;
    if (props.fs) {
        fs = getShaderSource(props.platformInfo, props.fs);
    }
    return { ...props, vs, fs };
}
/** Create a shader from the different overloads */
function getShaderSource(platformInfo, shader) {
    // TODO - detect WGSL/GLSL and throw an error if not supported
    if (typeof shader === 'string') {
        return shader;
    }
    switch (platformInfo.type) {
        case 'webgpu':
            if (shader?.wgsl) {
                return shader.wgsl;
            }
            throw new Error('WebGPU does not support GLSL shaders');
        default:
            if (shader?.glsl) {
                return shader.glsl;
            }
            throw new Error('WebGL does not support WGSL shaders');
    }
}