[GLSL] Some Questions regarding matrices

Newbie & Debugging Questions
#1

Hello everyone.

I have two (probably very noob-ish) questions.

  1. Can I change the content of a uniform multiple times without side-effects? Like this:

myShader.bind();

myShader.changeUniformMat4f(someUniformPointer,object0.objMat);
object0.draw();

myShader.changeUniformMat4f(someUniformPointer,object1.objMat);
object1.draw();

myShader.changeUniformMat4f(someUniformPointer,object2.objMat);
object2.draw();

myShader.unbind();
  1. I don’t understand matrix-multiplication very well, so, is this GLSL code correct?

void main(void)
{
    // cameraMatrix, is the matrix of my camera, containing position and rotation.
    // myObjectMatrix, is the matrix of a object in my world. It has a position and rotation.
    gl_Position = gl_ProjectionMatrix * cameraMatrix * myObjectMatrix;
    
    gl_TexCoord[0] = gl_MultiTexCoord0;
    gl_FrontColor = gl_Color;
}

I hope I explained that well and understandable.
My english isn’t the best.

Please tell me about every mistake in the code and shader.
I wan’t to use this for my main-game project, so it has to be as bug-free as possible.

  • Longor1996