glColor

glColor is a function in the OpenGL (Open Graphics Library) API, which is a cross-language, cross-platform API for rendering 2D and 3D vector graphics. The function is used to specify the color of vertices in a scene. It is part of the fixed-function pipeline, which is the traditional method of rendering in OpenGL.

The glColor function takes four parameters, each representing a component of the color: red, green, blue, and alpha. These parameters are typically floating-point numbers ranging from 0.0 to 1.0, where 0.0 represents the absence of the color component and 1.0 represents the full intensity of the color component. The alpha component represents the opacity of the color, with 0.0 being fully transparent and 1.0 being fully opaque.

When glColor is called, it sets the current color for subsequent vertices. This color is then used in the rendering process to determine the final color of each pixel on the screen. The glColor function can be called multiple times within a single rendering pass to change the color of different vertices.

It's important to note that glColor is part of the fixed-function pipeline and has been deprecated in modern versions of OpenGL. In modern OpenGL, shaders are used to specify the color of vertices and fragments. However, glColor is still supported in older versions of OpenGL for compatibility reasons.