WebGLRenderingContext.drawArrays

The WebGLRenderingContext.drawArrays() method of the WebGL API renders primitives from array data.

Syntax

void gl.drawArrays(mode, first, count);

Parameters

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.

Return value

None.

Exceptions

• If mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
• If first or count are negative, a gl.INVALID_VALUE error is thrown.
• if gl.CURRENT_PROGRAM is null, a gl.INVALID_OPERATION error is thrown.

Examples

gl.drawArrays(gl.POINTS, 0, 8);

Specifications

Specification	Status	Comment
WebGL 1.0 The definition of 'drawArrays' in that specification.	Recommendation	Initial definition.
OpenGL ES 2.0 The definition of 'glDrawArrays' in that specification.	Standard	Man page of the OpenGL API.

Browser compatibility

See also

• WebGLRenderingContext.drawElements()
• ext.drawArraysInstancedANGLE()
• ext.drawElementsInstancedANGLE()
• ext.vertexAttribDivisorANGLE()
• WebGL2RenderingContext.drawArraysInstanced()
• WebGL2RenderingContext.drawElementsInstanced()
• WebGL2RenderingContext.vertexAttribDivisor()