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 openal_source_set    (PECL) openal_source_set -- 
     Set source property
     说明bool  openal_source_set ( resource source, int property, mixed setting ) 参数- source
 
        An Open AL(Source) resource
        (previously created by openal_source_create()).
        - property
 
        Property to set, one of:
        AL_BUFFER (OpenAL(Source)),
        AL_LOOPING (bool),
        AL_SOURCE_RELATIVE (int),
        AL_SOURCE_STATE (int),
        AL_PITCH (float),
        AL_GAIN (float),
        AL_MIN_GAIN (float),
        AL_MAX_GAIN (float),
        AL_MAX_DISTANCE (float),
        AL_ROLLOFF_FACTOR (float),
        AL_CONE_OUTER_GAIN (float),
        AL_CONE_INNER_ANGLE (float),
        AL_CONE_OUTER_ANGLE (float),
        AL_REFERENCE_DISTANCE (float),
        AL_POSITION (array(float,float,float)),
        AL_VELOCITY (array(float,float,float)),
        AL_DIRECTION (array(float,float,float)).
        - setting
 
        Value to assign to specified property.
        Refer to the description of property
        for a description of the value(s) expected.
        
 返回值
     如果成功则返回 TRUE,失败则返回 FALSE。
     
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