glScissorIndexedv

glScissorIndexedv is a function in the OpenGL programming interface. It is used to control which portions of the screen are rendered to. Specifically, it sets the scissor box for a particular indexed scissor test. The scissor test is a feature that allows applications to restrict drawing operations to a rectangular region of the window. When enabled, any fragments that fall outside the defined scissor rectangle are discarded.

The "Indexedv" suffix indicates that this function takes an array of values as an argument. The function takes two parameters: an index and a pointer to an array of four integers. The index specifies which scissor test to modify, as modern OpenGL supports multiple scissor tests simultaneously. The array of four integers defines the left, bottom, width, and height of the scissor rectangle for the specified index. This allows for fine-grained control over rendering areas, which can be useful in various rendering techniques, such as split-screen displays or applying different rendering effects to distinct regions of the screen. Using glScissorIndexedv requires that the GL_SCISSOR_TEST capability be enabled.