OpenGL define vertex position in pixels

Question

I\'ve been writing a 2D basic game engine in OpenGL/C++ and learning everything as I go along. I\'m still rather confused about defining vertices and their \"position\". Tha

Answer 1

It is called transformation.

Vertices are set in 3D coordinates which is transformed into a viewport coordinates (into your window view). This transformation can be set in various ways. Orthogonal transformation can be easiest to understand as a starter.

http://www.songho.ca/opengl/gl_transform.html

http://www.opengl.org/wiki/Vertex_Transformation

http://www.falloutsoftware.com/tutorials/gl/gl5.htm