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c++openglglm-math

glm precision qualifier

What actually "precision qualifier" do, in the glm library?

P.S. At first I thought that it switch between float/double/long double... But than I found d -version of mat4 dmat4 (with double type).

P.P.S. I use it in C++ code.

Solution

  • From: http://glm.g-truc.net/0.9.1/api/a00229.html

    The GLSL language allows the user to define the precision of a particular variable. In OpenGL's GLSL, these precision qualifiers have no effect; they are there for compatibility with OpenGL ES's precision qualifiers, where they do have an effect.

    C++ has no language equivalent to precision qualifiers. So GLM provides the next-best thing: a number of typedefs of the Template types that use a particular precision.

    None of these types make any guarantees about the actual precision used.