Questions

Try these questions to test your knowledge from this chapter:

1. Which steps of the OpenGL render pipeline are user-definable? Which steps must be defined in order to render anything? You may need to reference the documentation at https://www.khronos.org/opengl/wiki/Rendering_Pipeline_Overview.

2. You're writing a shader for an OpenGL 2.1 program. Does the following look correct?

   #version 2.1

   attribute highp vec4 vertex;

   void main (void)
   {
   gl_Position = vertex;
   }

3. Is the following a vertex or fragment shader? How can you tell?

   attribute highp vec4 value1;
   varying highp vec3 x[4];
   void main(void)
   {
     x[0] = vec3(sin(value1[0] * .4));
     x[1] = vec3(cos(value1[1]));
     gl_Position = value1;
     x[2] = vec3(10 * x[0])
   }

4. Given the following vertex shader, what code do you need to write to assign simple values to the two variables?

   attribute...