What is glClearColor in opengl?
Description. glClearColor 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].
How do you clear a buffer bit 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.
What is Alpha in glClearColor?
The alpha is opacity, not transparency. This means that when it is 0, you can’t see it at all. When it is 1, you can see it completely. When it is 0.5f, you can see it at half intensity.
What is glClear Gl_color_buffer_bit );?
glClear takes a single argument that is the bitwise OR of several values indicating which buffer is to be cleared. The values are as follows: GL_COLOR_BUFFER_BIT. Indicates the buffers currently enabled for color writing.
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 is Alpha color?
The alpha channel is a color component that represents the degree of transparency (or opacity) of a color (i.e., the red, green and blue channels). It is used to determine how a pixel is rendered when blended with another.
What is GL depth buffer bit?
The depth buffer is automatically created by the windowing system and stores its depth values as 16 , 24 or 32 bit floats. In most systems you’ll see a depth buffer with a precision of 24 bits. When depth testing is enabled, OpenGL tests the depth value of a fragment against the content of the depth buffer.
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 the difference between glclearcolor and glfloat?
glClearColor 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 . The type of the red , green, blue , and alpha parameters was changed from GLclampf to GLfloat.
What are the initial values of glclearcolor?
The initial values are all 0. glClearColor 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 is the use of glclearcolor?
The function was called between a call to glBegin and the corresponding call to glEnd. 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 is the default value of glgeterror glClear?
The alpha value that glClear uses to clear the color buffers. The default value is zero. This function does not return a value. The following error codes can be retrieved by the glGetError function. The function was called between a call to glBegin and the corresponding call to glEnd.