earComponent;
      uniform float4 uBrushColor;
      uniform float4 uPositionUnpackingTransform;
      uniform float4 uSideUnpackingTransform;
      uniform float4 uForwardUnpackingTransform;
      uniform int uTextureMapping;
      uniform float uTextureAnimationProgress;
      uniform int uNumTextureAnimationFrames;
      uniform int uNumTextureAnimationRows;
      uniform int uNumTextureAnimationColumns;

      Varyings main(const Attributes attributes) {
        Varyings varyings;

        float3 positionAndOpacityShift = unpackPositionAndOpacityShift(
            uPositionUnpackingTransform, attributes.positionAndOpacityShift);
        varyings.position = positionAndOpacityShift.xy;

        varyings.position += calculateAntialiasingAndPositionOutset(
            unpackDerivativeAndLabel(uSideUnpackingTransform,
                                     attributes.sideDerivativeAndLabel),
            unpackDerivativeAndLabel(uForwardUnpackingTransform,
                                     attributes.forwardDerivativeAndLabel),
            mat2FromFloat4ColumnMajor(uObjectToCanvasLinearComponent),
            varyings.pixelsPerDimension,
            varyings.normalizedToEdgeLRFB,
            varyings.outsetPixelsLRFB);