WebGL2RenderingContext.drawRangeElements()

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WebGL2RenderingContext.drawRangeElements() 方法在 WebGL API renders primitives from array data in a given range.

void gl.drawRangeElements(mode, start, end, count, type, offset);

mode


									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.

start


									GLuint

specifying the minimum array index contained in


								offset

end


									GLuint

specifying the maximum array index contained in


								offset

count


									GLsizei

specifying the number of elements to be rendered.

type


									GLenum

specifying the type of the values in the element array buffer. Possible values are:

offset


									GLintptr

specifying an offset in the element array buffer. Must be a valid multiple of the size of the given


								type

None.

若 mode is not one of the accepted values, a gl.INVALID_ENUM error is thrown.
若 offset is a valid multiple of the size of the given type, a gl.INVALID_OPERATION error is thrown.
若 count is negative, a gl.INVALID_VALUE error is thrown.

gl.drawRangeElements(gl.POINTS, 0, 7, 8, gl.UNSIGNED_BYTE, 0);

规范	状态	注释
WebGL 2.0 The definition of 'drawRangeElements' in that specification.	编者草案	Initial definition for WebGL.
OpenGL ES 3.0 The definition of 'glDrawRangeElements' in that specification.	标准	Man page of the (similar) OpenGL API.