CS 4621: Lecture 5

Recap

• The GLSL Programming Language
  • Vector data types: vec2, vec3, vec4, and so on.
  • Matrix data types: mat2, mat3, and mat4.
  • Arrays
  • Swizzling
• Three ways to pass data to GLSL
  • Vertex attributes
  • Uniform variables
  • Varying variables
• Using matrices in GLSL
  • The glMatrix library
  • Passing vectors and matrices to WebGL
  • Applying linear and affine transformations in GLSL code
  • Chains of transformations.
  • The 3D matrix pipeline.

This time

• Per-fragment operations in OpenGL
  • These are things that happen to fragments on their way to the framebuffer.
  • Pixel ownership test (not our problem)
  • Scissors test (clip to subrectangle, not so common)
  • Alpha test (little used)
  • Stencil test (sometimes useful)
  • Depth test (important)
  • Blending (important)
  • Dithering (no need to worry about it)

Exhibits

• #0: The depth test
• #1: Blending