GL_EXT_window_rectangles
https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_window_rectangles.txt
GL_EXT_window_rectangles

	GL_INCLUSIVE_EXT 0x8F10
	GL_EXCLUSIVE_EXT 0x8F11
	GL_WINDOW_RECTANGLE_EXT 0x8F12
	GL_WINDOW_RECTANGLE_MODE_EXT 0x8F13
	GL_MAX_WINDOW_RECTANGLES_EXT 0x8F14
	GL_NUM_WINDOW_RECTANGLES_EXT 0x8F15
	void glWindowRectanglesEXT (GLenum mode, GLsizei count, const GLint box[])