How can I learn cesium how to assamble the final webgl shader?

livizy · December 6, 2021, 7:19am

Is there some topic or blog descripted how cesium assamble the final webgl shader?

ZhefengJin · December 6, 2021, 7:39am

see this

CesiumGS/cesium/blob/71de4f3cb646ec2f1089373aea9875f1498aa042/Source/Renderer/ShaderSource.js#L155

    
      
            // Concatenate the source code for the function dependencies.
            // Iterate in reverse so that dependent items are declared before they are used.
            var builtinsSource = "";
            for (var i = dependencyNodes.length - 1; i >= 0; --i) {
              builtinsSource = builtinsSource + dependencyNodes[i].glslSource + "\n";
            }
          
          
  return builtinsSource.replace(root.glslSource, "");
          }
          
          
function combineShader(shaderSource, isFragmentShader, context) {
            var i;
            var length;
          
          
  // Combine shader sources, generally for pseudo-polymorphism, e.g., czm_getMaterial.
            var combinedSources = "";
            var sources = shaderSource.sources;
            if (defined(sources)) {
              for (i = 0, length = sources.length; i < length; ++i) {
                // #line needs to be on its own line.
                combinedSources += "\n#line 0\n" + sources[i];

check getBuiltinsAndAutomaticUniforms and generateDependencies functions.

livizy · December 8, 2021, 8:16am

@ZhefengJin Thanks for your swift replication. Is there some doc about czm_* I can learn?

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How can I learn cesium how to assamble the final webgl shader?

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