Question

Which of the following functions draws a shape using an index buffer? a.g|DrawElements() b.glDrawArrays() c.glDrawIndex() d.None of the above

Answer 1

The correct OpenGL function that uses an index buffer to draw shapes is glDrawElements(), making the right answer option 'a'.

Step-by-step explanation:

The function in OpenGL that draws shapes using an index buffer is glDrawElements(). An index buffer is used to tell OpenGL which vertices to use and in what order without having to duplicate the vertex data. This can be more efficient when the same vertices are shared between multiple polygons.

In contrast, glDrawArrays() draws primitives using sequentially ordered vertex data starting at a given index, without the need to specify indices in a separate buffer. There is no function named glDrawIndex() in OpenGL, making option 'c' incorrect. So, the correct answer to which function draws a shape using an index buffer is a. glDrawElements().

The correct function that draws a shape using an index buffer is a. DrawElements().

The glDrawElements() function is part of the OpenGL API and is used to render geometry using vertex data contained in an index buffer. It allows for efficient rendering by reusing vertex data and enables complex shapes to be drawn with fewer vertices.

The other options, b. glDrawArrays() and c. glDrawIndex(), do not specifically use an index buffer to draw shapes.