What is glClear OpenGL?

The glClear function sets the bitplane area of the window to values previously selected by glClearColor, glClearIndex, glClearDepth, glClearStencil, and glClearAccum. You can clear multiple color buffers simultaneously by selecting more than one buffer at a time using glDrawBuffer.

Why is glClearColor used?

The glClearColor function specifies the red, green, blue, and alpha values used by glClear to clear the color buffers. Values specified by glClearColor are clamped to the range [0,1].

What does glClear Gl_color_buffer_bit do?

A call to glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) clears the OpenGL color and depth buffers (or any other buffer or combination of buffers). OpenGL being a state machine, it is good practice to start each frame with a clean slate.

What is Glut_single?

When drawing to a single buffered context (GLUT_SINGLE), there is only one framebuffer that is used to draw and display the content. This means, that you draw more or less directly to the screen. In addition, things draw last in a frame are shown for a shorter time period then objects at the beginning.

What is GLfloat?

h defines GLfloat, it defines it a set size that does not change per system. This helps keeps openGL crossplatform compilant. openGL uses RGB values to define a color. (Red, Green, Blue), also your can add a transparency value to a color also, which is the fourth value.

What is the difference between glColor3d and glColor3f?

What is the difference between glColor3d and glColor3f? A. glColor3d only sets RGB, while glColor3f sets R,G,B and A B.

What is glcolor4f?

glcolor sets a new four-valued RGBA color. glcolor has two major variants: glcolor3 and glcolor4. glcolor3 variants specify new red, green, and blue values explicitly and set the current alpha value to 1.0 (full intensity) implicitly. glcolor4 variants specify all four color components explicitly.