pashok3d / Bezier_Curve

Assembler MIPS-32 program that draws quadratic Bezier curve

Bezier curve

Assembler MIPS-32 program that draws quadratic Bezier curve.

Joke

Using block input, this program requires such a small amount of memory, that your smart vacuum cleaner could easely handle it. (It only needs MIPS in it actually.)

How to run

• Download MARS MIPS simulator
  • http://courses.missouristate.edu/KenVollmar/mars/
• Download Bezier_Curve.asm
• Place (Create) image_in.bmp in the MARS MIPS simulator directory
• Using MARS MIPS simulator, run Bezier_Curve.asm and follow commands
• As a result image_out.bmp will be created

Problems faced during project development

• How to make fractional arithmetics in MIPS?
  • Bad solution: Use MIPS Floating Point Instructions
  • Good solution: Use Q number format
  • Best solution: Avoid using fractional arithmetics. Obviously, the smallest unit we operate on is pixel. Defining pixel's position by two integers, we actually don't have to deal with fractional numbers, because Bx and By will be rounded anyway.
• To take care about proper rounding? (2.8 -> 3, not 2)
  • That is not true.
• Runtime exception at "adress": fetch address not aligned on word boundary "adress". Program doesn't want to read FileSize (or DataOffset, itc.) from header (which was copied in ram "buffer") using lw.
  • Solution: copied FileSize located in "buffer" is probably at the adress which is not divisible by 4 bytes, so we need to add .align 2 in .data section before "buffer" declaration.

FAQ

• Can't pass my coordinates to the program properly.
  • Press Enter after each number you passing.