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  • Hash : d2a67b96
    Author : Olli Etuaho
    Date : 2014-10-21T16:42:57

    Fix precision tracking for built-in function return values
    
    Previously, the type of the return value of all function calls was set to
    the type of the return value in the function signature. This did not
    carry precision information.
    
    This patch changes this so that the return value precision is set
    correctly for built-in functions. For single-argument math functions, it
    mostly depends on that addUnaryMath sets the type of the return value to
    be the same as the type of the operand. The type is replaced but the
    precision information from the operand type is retained when needed. For
    multi-argument math functions, precision is determined based on all the
    nodes in the aggregate after the type has been set. For texture
    functions, the precision is set according the sampler type as per ESSL
    1.0 spec. For textureSize, the precision is always highp as per ESSL 3.0
    spec.
    
    BUG=angle:787
    
    Change-Id: I48448e3ffe38656b91177dee9b60dd07a03cd095
    Reviewed-on: https://chromium-review.googlesource.com/224951
    Reviewed-by: Jamie Madill <jmadill@chromium.org>
    Reviewed-by: Nicolas Capens <capn@chromium.org>
    Tested-by: Olli Etuaho <oetuaho@nvidia.com>
    

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