如果未绑定，均匀值保留在GLSL着色器中？ [英] Do uniform values remain in GLSL shader if unbound?

问题描述

我正在制作一个程序，它使用两个不同的着色器来处理不同的图元。我的问题是，如果我绑定一个程序，发送统一的变量，然后使用另一个着色程序，并回到第一个，将传递的统一值保持？下面是一些伪代码：

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();
    }
}

推荐答案

是，制服是特定于程序的，如果你解除绑定并重新绑定，它将是持久的。

Yes, uniforms are specific to a program, and will be persistent if you unbind and rebind it.

此外，如果你愿意， glGetUniform 。

Also, if you want, you could easily verify this yourself in that sample with glGetUniform.

从 OpenGL 4.1规范：

2.11.7统一变量

... Uniforms是程序对象的特定状态。它们在加载后保留它们的值，并且只要程序对象被使用，它们的值就被恢复，只要程序对象没有被重新链接。 ...

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. ...

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