Question

OpenGL is a cross platform API for rendering 2D & 3D graphics. How the process of image scanning to display surface from the frame buffer is performed. Discuss with diagram?

Answer 1

The Rendering pipeline is the sequence of steps that OpenGL takes, when it is doing rendering of the objects. The overview of this will provide the high-level description of the steps in the pipeline.

OpenGL rendering pipeline is initiated when the we are initiating the rendering operations.

It requires the presence of a properly defined vertex array objects and linked program objects that provide the shaders of the programming pipeline stages.

Process of 3D rendering pipeline:

Vertex processing: It process and transform the individual vertices.

Rasterization: It converts primitive into set of a set of fragments. Fragments can be created as pixel as a 3D spaces, which aligned into pixel grid, which is having the attributes such as position, color, normal, and texture.

Fragment Processing: It processes the individual fragments.

Output Merging: It combines the fragments of all primitive into 2D color-pixel for the display.