EXT_disjoint_timer_query.getQueryObjectEXT() - Web APIs 编辑

The EXT_disjoint_timer_query.getQueryObjectEXT() method of the WebGL API returns the state of a query object.

Syntax

any ext.getQueryObjectEXT(query, pname);

Parameters

query

A WebGLTimerQueryEXT object from which to return information.

pname

A GLenum specifying which information to return. Must be ext.QUERY_RESULT_EXT or ext.QUERY_RESULT_AVAILABLE_EXT.

Return value

Depends on pname:

• If pname is ext.QUERY_RESULT_EXT: A GLuint64EXT containing the query result.
• If pname is ext.QUERY_RESULT_AVAILABLE_EXT: A GLboolean indicating whether or not a query result is available.

Examples

var ext = gl.getExtension('EXT_disjoint_timer_query');
var query = ext.createQueryEXT();
ext.beginQueryEXT(ext.TIME_ELAPSED_EXT, query);

// ... drawing ...

ext.endQueryEXT(ext.TIME_ELAPSED_EXT);

// At some point in the future, after returning control to the browser
var available = ext.getQueryObjectEXT(query, ext.QUERY_RESULT_AVAILABLE_EXT);
var disjoint = gl.getParameter(ext.GPU_DISJOINT_EXT);

if (available && !disjoint) {
  // See how much time the rendering of the object took in nanoseconds.
  var timeElapsed = ext.getQueryObjectEXT(query, ext.QUERY_RESULT_EXT);
}

Specifications

Browser compatibility

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See also

• WebGLRenderingContext.getExtension()
• WebGLTimerQueryEXT
• EXT_disjoint_timer_query