Does GL shader support really work?

As far as I know, this code should work:

Code:

---

void
MyClass::draw()
{
  if (this->pshader->isLinked()) {
    int val_loc = this->pshader->attributeLocation("val");
    this->pshader->setUniformValue(val_loc, (GLfloat)1.0);
  }
  // OpenGL stuff
}

---

Vertex shader:

Code:

---

uniform float val;
 
varying float new_val;
 
void main()
{
  new_val = val;
  gl_Position = ftransform();
}

---

Fragment shader:

Code:

---

varying float new_val;
 
void main()
{
  if (new_val < 0.5)
    gl_FragColor = vec4(1.0,0.0,0.0,1.0);
  else
    gl_FragColor = vec4(0.0,0.0,1.0,1.0);
}

---

but my object appears red...

I tested the shader code by using the "classical" OpenGL functions to include it in OpenGL stuff and it works well, my object appearing blue as expected.
So I suspect there is really an issue with Qt integration of GLSL!

Where did you put this code? What is the superclass of MyClass?

I fixed the problem: get attribute location and set uniform value!!!
My apologizes!
You can delete this thread now, at your convenience.