ANGLE_instanced_arrays: drawElementsInstancedANGLE() method
The ANGLE_instanced_arrays.drawElementsInstancedANGLE()
method of the WebGL API renders primitives from array data like the gl.drawElements()
method. In addition, it can execute multiple instances of a set of elements.
Note: When using WebGL2
, this method is available as gl.drawElementsInstanced()
by default.
Syntax
js
drawElementsInstancedANGLE(mode, count, type, offset, 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.
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
when using theOES_element_index_uint
extension.
offset
-
A
GLintptr
specifying an offset in the element array buffer. Must be a valid multiple of the size of the giventype
. primcount
-
A
GLsizei
specifying the number of instances of the set of elements to execute.
Return value
None (undefined
).
Exceptions
- If
mode
is not one of the accepted values, agl.INVALID_ENUM
error is thrown. - If
offset
is an invalid multiple of the size of the given type, agl.INVALID_OPERATION
error is thrown. - If
count
orprimcount
are negative, agl.INVALID_VALUE
error is thrown.
Examples
js
const ext = gl.getExtension("ANGLE_instanced_arrays");
ext.drawElementsInstancedANGLE(gl.POINTS, 2, gl.UNSIGNED_SHORT, 0, 4);
Specifications
Specification |
---|
WebGL ANGLE_instanced_arrays Khronos Ratified Extension Specification |
Browser compatibility
BCD tables only load in the browser
See also
ext.drawArraysInstancedANGLE()
ext.vertexAttribDivisorANGLE()
WebGLRenderingContext.drawArrays()
WebGLRenderingContext.drawElements()
WebGL2RenderingContext.drawArraysInstanced()
WebGL2RenderingContext.drawElementsInstanced()
WebGL2RenderingContext.vertexAttribDivisor()
WEBGL_multi_draw.multiDrawElementsInstancedWEBGL()