Do uniform values remain in GLSL shader if unbound?
c++, glsl, opengl
Solution
Yes, uniforms are specific to a program, and will be persistent if you unbind and rebind it.
Also, if you want, you could easily verify this yourself in that sample with glGetUniform.
From the OpenGL 4.1 Specification:
2.11.7 Uniform Variables
... Uniforms are program object-specific state. They retain their values once loaded, and their values are restored whenever a program object is used, as long as the program object has not been re-linked. ...
Problem
I am writing a program that uses two different shaders for different primitives. My question is: if I bind a program, send it uniform variables, then use another shader program and come back to the first one, will the passed uniform values remain? Here is some pseudocode: ``` glUseProgram(shader1); glUniform(shader1,...); //stuff for(elements in a list) { if(element.type = 1) { glUseProgram(shader2); element.draw(); } else { glUseProgram(shader1); //Here, do the uniforms from above remain, if shader2 was bound before? element.draw(); } } ```