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WebGLRenderingContext: drawElements() method - Web APIs | MDN
WebGLRenderingContext: drawElements() method Baseline Widely available
The WebGLRenderingContext.drawElements()
method of the WebGL API renders primitives from array data.
drawElements(mode, count, type, offset)
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 of the bound element array
buffer to be rendered. For example, to draw a wireframe triangle with gl.LINES
the count should be 2 endpoints per line × 3 lines = 6 elements. However to draw the
same wireframe triangle with gl.LINE_STRIP
the element array buffer does not
repeat the indices for the end of the first line/start of the second line, and end of the
second line/start of the third line, so count
will be four. To draw the same
triangle with gl.LINE_LOOP
the element array buffer does not repeat the
first/last vertex either so count
will be three.
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:
offset
A GLintptr
specifying a byte offset in the element array buffer. Must
be a valid multiple of the size of the given type
.
If mode
is not one of the accepted values, a
gl.INVALID_ENUM
error is thrown.
If offset
is not a valid multiple of the size of the given type, a
gl.INVALID_OPERATION
error is thrown.
If count
is negative, a gl.INVALID_VALUE
error is thrown.
gl.drawElements(gl.POINTS, 8, gl.UNSIGNED_BYTE, 0);