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2024年4月19日发(作者：用递归方法求 2 n的和)

glscissor 多边形

English answer：

The `glScissor` function in OpenGL sets the scissor

rectangle, which is a rectangular region of the window that

OpenGL will draw to. Anything outside of this rectangle

will be clipped, or not drawn.

The `glScissor` function takes four parameters:

`x`: The x-coordinate of the lower-left corner of the

scissor rectangle.

`y`: The y-coordinate of the lower-left corner of the

scissor rectangle.

`width`: The width of the scissor rectangle.

`height`: The height of the scissor rectangle.

The scissor rectangle is defined in window coordinates,

which means that the origin (0, 0) is at the lower-left

corner of the window. The x-axis extends to the right, and

the y-axis extends to the top.

The scissor rectangle can be used to clip any type of

OpenGL primitive, including points, lines, and triangles.

To enable scissor testing, you must first call

`glEnable(GL_SCISSOR_TEST)`. Once scissor testing is

enabled, only the pixels within the scissor rectangle will

be drawn.

The scissor rectangle can be used to create a variety

of effects, such as:

Clipping objects to a specific region of the window.

Creating window borders.

Masking out certain areas of the window.

Here is an example of how to use the `glScissor`


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