_drawLayersInViewport()

in modules/core/src/passes/layers-pass.js [92:157]

• 53 lines of code
• 11 McCabe index (conditional complexity)

  _drawLayersInViewport(gl, {layers, onError, viewport, view}, drawLayerParams) {
    const glViewport = getGLViewport(gl, {viewport});

    if (view && view.props.clear) {
      const clearOpts = view.props.clear === true ? {color: true, depth: true} : view.props.clear;
      withParameters(
        gl,
        {
          scissorTest: true,
          scissor: glViewport
        },
        () => clear(gl, clearOpts)
      );
    }

    // render layers in normal colors
    const renderStatus = {
      totalCount: layers.length,
      visibleCount: 0,
      compositeCount: 0,
      pickableCount: 0
    };

    setParameters(gl, {viewport: glViewport});

    // render layers in normal colors
    for (let layerIndex = 0; layerIndex < layers.length; layerIndex++) {
      const layer = layers[layerIndex];
      const {
        shouldDrawLayer,
        layerRenderIndex,
        moduleParameters,
        layerParameters
      } = drawLayerParams[layerIndex];

      // Calculate stats
      if (shouldDrawLayer && layer.props.pickable) {
        renderStatus.pickableCount++;
      }
      if (layer.isComposite) {
        renderStatus.compositeCount++;
      } else if (shouldDrawLayer) {
        // Draw the layer
        renderStatus.visibleCount++;

        // overwrite layer.context.viewport with the sub viewport
        moduleParameters.viewport = viewport;

        try {
          layer.drawLayer({
            moduleParameters,
            uniforms: {layerIndex: layerRenderIndex},
            parameters: layerParameters
          });
        } catch (err) {
          if (onError) {
            onError(err, layer);
          } else {
            log.error(`error during drawing of ${layer}`, err)();
          }
        }
      }
    }

    return renderStatus;
  }