Missing GLSL functionality - opengl

Question

I've moved a Visual Studio project to a different computer and now GLSL won't compile shaders which previously worked fine. It's getting stuck implicitly converting vec4s to vec3s and it tells me the 'dot' function is undefined, for example.
I'm using the GLSDK and the project builds correctly, and glGetString(GL_SHADING_LANGUAGE_VERSION) tells me 4.40. It's obviously something I don't have installed but used to, but I've searched around and cannot work out what.

Answer 1

Sorry, it sounds like your old drivers were being a bit too permissive. Your new drivers are correct in rejecting the shaders.
vec4 a = vec4(1.0, 2.0, 3.0, 4.0);
vec3 x = vec3(a); // Ok
// vec3 y = a; error
Indeed, if I run the implicit conversion through the reference compiler, I get the following error message:
ERROR: 0:4: '=' : cannot convert from '4-component vector of float' to '3-component vector of float'
ERROR: 1 compilation errors. No code generated.
Try validating your scripts with the reference compiler, it may catch some portability issues like these. Your only real option here is to fix the broken shaders.
What about dot()?
Try this:
#version 330
void main() {
vec4 x = vec4(1.0);
vec3 y = vec3(2.0);
float z = dot(x, y);
}
When I run the validator, I get:
ERROR: 0:5: 'dot' : no matching overloaded function found
ERROR: 1 compilation errors. No code generated.
The error here is that my arguments to dot() are the wrong type. Again, the problem is in my shader.