ANGLE_instanced_arrays: drawArraysInstancedANGLE() method

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

Syntax

drawArraysInstancedANGLE(mode, first, count, primcount)

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.

primcount

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

Return value

None (undefined).

Exceptions

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

Examples

const ext = gl.getExtension("ANGLE_instanced_arrays");
ext.drawArraysInstancedANGLE(gl.POINTS, 0, 8, 4);

Specifications

Browser compatibility

See also

• ext.drawElementsInstancedANGLE()
• ext.vertexAttribDivisorANGLE()
• WebGLRenderingContext.drawArrays()
• WebGLRenderingContext.drawElements()
• WebGL2RenderingContext.drawArraysInstanced()
• WebGL2RenderingContext.drawElementsInstanced()
• WebGL2RenderingContext.vertexAttribDivisor()
• WEBGL_multi_draw.multiDrawArraysInstancedWEBGL()