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

WebGL2RenderingContext: drawRangeElements() method - Web APIs

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The WebGL2RenderingContext.drawRangeElements() method of the WebGL API renders primitives from array data in a given range.

drawRangeElements(mode, start, end, count, type, offset)

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.

start

A GLuint specifying the minimum array index contained in offset.

end

A GLuint specifying the maximum array index contained in offset.

count

A GLsizei specifying the number of elements to be rendered.

type

A GLenum specifying the type of the values in the element array buffer. Possible values are:

• gl.UNSIGNED_BYTE
• gl.UNSIGNED_SHORT
• gl.UNSIGNED_INT

offset

A GLintptr specifying an offset in the element array buffer. Must be a valid multiple of the size of the given type.

None (undefined).

• If mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
• If offset is a valid multiple of the size of the given type, a gl.INVALID_OPERATION error is thrown.
• If count is negative, a gl.INVALID_VALUE error is thrown.

gl.drawRangeElements(gl.POINTS, 0, 7, 8, gl.UNSIGNED_BYTE, 0);

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