Hi Ankur, On Sat, Apr 16, 2011 at 10:40 AM, Ankur Gandhi <[email protected]> wrote: > You are right. both are quire different. I ported OSG over OpenGL ES 2.0 and > everything is behaving in different way. I guess I almost need to rewrite my > OpenGL application. Also i think i need to go through ShaderGen to understand > how well the OpenGL application gets converted to GLSL language.
The big difference with GLES2 is that there is no fixed function pipeline so you have to provide shaders yourself. This situtation is the same for the GL 3.x and beyond profiles where backwards compatability is dropped, so it's in't really a case of GL vs GLES2, rather it's GL1/GLES1 fixed function vs GL3/GL4/GLES2 shader based, with GL2 sitting on the fence - doing both fixed function and shaders. You can also used shaders entirely with GL2, and even your the CMake to build only the shader backends, and not implement the fixed function state, so replicate much of what it takes to program GLES2 entirely on a machine with only GL2 available. This approach also allows you to build final applications that will more easily port between desktop and GLES2 targets. Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
