When i'm compiling a shader does it have to be complete? Can i use glCompileShader on a shader without a main() function? The OpenGL reference documentation has a nice writeup on program linking errors, but i can't find one for shader linking, so i have to ask here.
I want to have the ability to have each part of a shader in a different file. So f.e. i'll have a material calculating function and i'll have a "main" shader with the main function that'll only reference the material calculating function. Right now i have my shaderes as arrays of strings that they can read from a file, then i put together an array of string pointeres and compile that into a single shader (vertex, fragment, geometry). But if i could compile each invidividual shaders (parts of vertex shaders, instead of the whole vertex shader put together in an array of strings) and put them together when i'm linking the program, that would make the code much clearer and i could move the shader compilation code from the program managing code to the shader object itself (the one that load the string from file and exposes it).