The compiler service needs to know what options to pass to the compiler, and these options can affect the outcome of the shader blob. Runtime compiled shader output must match this file name in the binary directory. Pre-compiled shader blobs (e.g. those placed in a resource file) are permitted to drop options from the file name if the implementor can ensure the blob is compatible with the target. Defines are not written out as options, but written into the shader source, and therefore affect the cache key. Change-Id: I11e4a43fcf6818ddb29aca5eba3d8647ba4021a1 Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com> Reviewed-by: Oliver Wolff <oliver.wolff@digia.com>