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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/drawArraysInstanced below:

WebGL2RenderingContext: drawArraysInstanced() method - Web APIs

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The WebGL2RenderingContext.drawArraysInstanced() method of the WebGL 2 API renders primitives from array data like the gl.drawArrays() method. In addition, it can execute multiple instances of the range of elements.

Note: When using WebGL 1, the ANGLE_instanced_arrays extension can provide this method, too.

drawArraysInstanced(mode, first, count, instanceCount)

mode

A GLenum specifying the type primitive to render. Possible values are:

• gl.POINTS: Draws a single dot.
• gl.LINE_STRIP: Draws a straight line to the next vertex.
• gl.LINE_LOOP: Draws a straight line to the next vertex, and connects the last vertex back to the first.
• gl.LINES: Draws a line between a pair of vertices.
• gl.TRIANGLE_STRIP
• gl.TRIANGLE_FAN
• gl.TRIANGLES: Draws a triangle for a group of three vertices.

first

A GLint specifying the starting index in the array of vector points.

count

A GLsizei specifying the number of indices to be rendered.

instanceCount

A GLsizei specifying the number of instances of the range of elements to execute.

None (undefined).

gl.drawArraysInstanced(gl.POINTS, 0, 8, 4);

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