Video Programming:

Framebuffer

Computing Machinery II Tutorial:

Week of April 8th, 2019

Review

  • Last week we explored how to program the SNES controller. More specifically we saw the details on how to get button press information from the controller through GPIO programming.
  • We saw how all of those details could be kept local to a get_SNES() function. In effect we created a more convenient interface/abstraction for ourselves to program with in the main() function , i.e., data = get_SNES().

Assignment 4

Today:

 

  • Look at example 09_Framebuffer
  • Modify code to color one square white
  • Animate white square movement
    • Look at my modified example
      • Decoupled drawing from logic

Important parts of code

  • includes 
    • "framebuffer.h" for functions: initFramebuffer() and displayFramebuffer()
  • initFramebuffer()
    • uses mailbox communication protocol (clear?)
  • displayFramebuffer(), drawCheckerboard(), and drawSquare()
    • togther these functions write color values to the framebuffer array in an organised way that ends up looking like a checkerboard
    • pixel[(row * frameBufferWidth) + column] = color
      • gets executed for every pixel

Modifications

  1. how can I change the size of the squares without squares being cutoff on the edges?
  2. how can I paint the top left square white?
  3. how can I make a white square snake around the board as an animation?
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