MV 3202: Computer Graphics, homework 7

1. What is the texture matrix stack? What does it manipulate? Name one or more uses of this.
2. How can a texture be used to create diffuse lighting?
3. How can a texture be used for specular highlites?
4. Name three or more differences between drawing a bitmap and rendering a textured polygon.
5. The function drawDisk renders a solid blue disk of radius r. The function drawSquare renders a solid red square with sides of length 2*r such that it tightly encloses the disk. What does the following code render? What is in the stencil buffer after the code has executed?

   glClearStencil(0);
   glClear(GL_STENCIL_BUFFER_BIT);
   glEnable(GL_STENCIL_TEST);
   glDisable(GL_DEPTH_TEST);
   
   glStencilFunc(GL_ALWAYS, 0, 255);
   glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
   drawDisk();
   
   glStencilFunc(GL_GEQUAL, 0, 255);
   glStencilOp(GL_INCR, GL_DECR, GL_INCR);
   drawSquare();
       

6. Read Appendix A in your redbook. List, in order, the most important Geometric Operations and the most important Fragment Operations (skip the Pixel Operations) that are performed. I counted 25 total, give or take a few. Just list them, don't explain what those operations are.