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ANGLE_instanced_arrays: drawArraysInstancedANGLE() method

files/en-us/web/api/angle_instanced_arrays/drawarraysinstancedangle/index.md

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{{APIRef("WebGL")}}

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

[!NOTE] When using {{domxref("WebGL2RenderingContext", "WebGL2")}}, this method is available as {{domxref("WebGL2RenderingContext.drawArraysInstanced()", "gl.drawArraysInstanced()")}} by default.

Syntax

js-nolint
drawArraysInstancedANGLE(mode, first, count, primcount)

Parameters

  • mode

    • : A {{domxref("WebGL_API/Types", "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 {{domxref("WebGL_API/Types", "GLint")}} specifying the starting index in the array of vector points.

  • count

    • : A {{domxref("WebGL_API/Types", "GLsizei")}} specifying the number of indices to be rendered.

  • primcount

    • : A {{domxref("WebGL_API/Types", "GLsizei")}} specifying the number of instances of the range of elements to execute.

Return value

None ({{jsxref("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

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

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

  • {{domxref("ANGLE_instanced_arrays.drawElementsInstancedANGLE()", "ext.drawElementsInstancedANGLE()")}}
  • {{domxref("ANGLE_instanced_arrays.vertexAttribDivisorANGLE()", "ext.vertexAttribDivisorANGLE()")}}
  • {{domxref("WebGLRenderingContext.drawArrays()")}}
  • {{domxref("WebGLRenderingContext.drawElements()")}}
  • {{domxref("WebGL2RenderingContext.drawArraysInstanced()")}}
  • {{domxref("WebGL2RenderingContext.drawElementsInstanced()")}}
  • {{domxref("WebGL2RenderingContext.vertexAttribDivisor()")}}
  • {{domxref("WEBGL_multi_draw.multiDrawArraysInstancedWEBGL()")}}