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The WebGLRenderingContext.drawElements()
method of the WebGL API renders primitives from array data.
Syntax
void gl.drawElements(mode, count, type, offset);
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
- When using the
OES_element_index_uint
extension:gl.UNSIGNED_INT
- offset
- A
GLintptr
specifying an offset in the element array buffer. Must be a valid multiple of the size of the giventype
.
Return value
None.
Exceptions
- If
mode
is not one of the accepted values, agl.INVALID_ENUM
error is thrown. - If
offset
is a valid multiple of the size of the given type, agl.INVALID_OPERATION
error is thrown. - If
count
is negative, agl.INVALID_VALUE
error is thrown.
Examples
gl.drawElements(gl.POINTS, 8, gl.UNSIGNED_BYTE, 0);
Specifications
Specification | Status | Comment |
---|---|---|
WebGL 1.0 The definition of 'drawElements' in that specification. |
Recommendation | Initial definition. |
OpenGL ES 2.0 The definition of 'glDrawElements' in that specification. |
Standard | Man page of the OpenGL API. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 9 | 4.0 (2.0) | 11 | 12 | 5.1 |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | ? | 25 | (Yes) | ? | 12 | 8.1 |