@luma.gl/engine/dist/utils/shader-module-utils.js

3D Engine Components for luma.gl

// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
export function mergeShaderModuleBindingsIntoLayout(shaderLayout, modules) {
    if (!shaderLayout || !modules.some(module => module.bindingLayout?.length)) {
        return shaderLayout;
    }
    const mergedLayout = {
        ...shaderLayout,
        bindings: shaderLayout.bindings.map(binding => ({ ...binding }))
    };
    if ('attributes' in (shaderLayout || {})) {
        mergedLayout.attributes = shaderLayout?.attributes || [];
    }
    for (const module of modules) {
        for (const bindingLayout of module.bindingLayout || []) {
            for (const relatedBindingName of getRelatedBindingNames(bindingLayout.name)) {
                const binding = mergedLayout.bindings.find(candidate => candidate.name === relatedBindingName);
                if (binding?.group === 0) {
                    binding.group = bindingLayout.group;
                }
            }
        }
    }
    return mergedLayout;
}
export function shaderModuleHasUniforms(module) {
    return Boolean(module.uniformTypes && !isObjectEmpty(module.uniformTypes));
}
/** Returns binding-name aliases that should share the module-declared bind group. */
function getRelatedBindingNames(bindingName) {
    const bindingNames = new Set([bindingName, `${bindingName}Uniforms`]);
    if (!bindingName.endsWith('Uniforms')) {
        bindingNames.add(`${bindingName}Sampler`);
    }
    return [...bindingNames];
}
function isObjectEmpty(obj) {
    // @ts-ignore key is intentionally unused
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    for (const key in obj) {
        return false;
    }
    return true;
}
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