@deck.gl/core/dist/utils/shader.js

deck.gl core library

// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
// Merge two luma.gl shader descriptors
export function mergeShaders(target, source) {
    if (!source) {
        return target;
    }
    const result = { ...target, ...source };
    if ('defines' in source) {
        result.defines = { ...target.defines, ...source.defines };
    }
    if ('modules' in source) {
        result.modules = (target.modules || []).concat(source.modules);
        // Hack: prject32 and project64 cannot co-exist
        if (source.modules.some(module => module.name === 'project64')) {
            const index = result.modules.findIndex(module => module.name === 'project32');
            if (index >= 0) {
                result.modules.splice(index, 1);
            }
        }
    }
    if ('inject' in source) {
        if (!target.inject) {
            result.inject = source.inject;
        }
        else {
            const mergedInjection = { ...target.inject };
            for (const key in source.inject) {
                mergedInjection[key] = (mergedInjection[key] || '') + source.inject[key];
            }
            result.inject = mergedInjection;
        }
    }
    return result;
}
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