Hello,
Can any one gives me a detailed information about vertex shaders, the name meaning, usage and a tutorial if it is possible?
A vertex shader is a small program that plugs into your OpenGL (or D3D) app that will perform a number of calculations on each vertex sent to your GPU. There are many presentations/papers on both NVIDIA’s and ATI’s developer sites. http://developer.nvidia.com/ and http://www.ati.com/developer/
Like for example if you want to calculate vertex lighting yourself from some lighting equation you came up with, it would be easy with a vertex shader. You put all the calculations in the shader and this will be executed for every vertex you then sumbit to the graphics card while this shader is active.
-SirKnight
Just separate ARB_vertex_program(or NV_vp) which is low-level(assembly) and upcomming # ARB_vertex_shader which is high-level(C-like).
Nice examples of ARB_vp you can find in Humus page- http://esprit.campus.luth.se/~humus/
examples of ARB_vs exist in ATI Ashli tool.
specs: http://oss.sgi.com/projects/ogl-sample/registry/ARB/vertex_program.txt http://oss.sgi.com/projects/ogl-sample/registry/ARB/vertex_shader.txt