Do uniform values remain in GLSL shader if unbound?

问题

I am making a program that uses two different shaders for different 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();
    }
}

回答1:

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. ...

来源：https://stackoverflow.com/questions/10857602/do-uniform-values-remain-in-glsl-shader-if-unbound