OpenGL learning (II) opengl rendering pipeline

Vertex processor： Preprocess vertices , The original points are all three-dimensional , Finally, all the points we see are two-dimensional . This mapping process and the actual location of the point , It has something to do with which perspective we look . You need to adjust the coordinates of points through a series of matrices . in addition , You also need to determine the color of the point , This is related to the distance from the point to the lens and the illumination . All in all , The final result is the position of each point on our view and its color .

Cipper： Our view is limited , Points outside the view can be preprocessed by algorithm , No subsequent calculation is required .

primitive assemble： Primitive Assembly . Is to use a small grid to represent .

Rasterization： Gridding . It is to turn geometric figures into pixel lattice form .

Fragment processor： Color each pixel through texture and interpolation algorithm .

First step Vertex processor Get all the dots and colors . Second parts clip Delete points outside the Perspective , And use a small grid to connect the points , Get the rabbit on the left . Step 3 put each grid rasterization Become pixels . Final coloring .