# EuropaFuelMixer
#   - Mixes atmospheric O2 with Volatile Ice.
#   - Connect O2 vent to gas mixer input 1.
#   - Connect H2 (Ice Crusher output) to gas mixed input 2.
#   - Video explanation: https://youtu.be/Nqhcpk-3zro

# Credits: https://stationeers-wiki.com/Temperature_independent_fuel_mixing

# User configuration.
define MaxGasTankPresure 30000  # 30 MPa

# Device Ports
alias dGasMixer d0
alias dPipeAnalyzer1 d1
alias dPipeAnalyzer2 d2
alias dPipeIgniter d3
alias dButton d4
alias dGasTank d5

# State registers.
alias rOxygenPressure r8
alias rOxygenTemperature r9
alias rVolatilePressure r10
alias rVolatileTemperature r11
alias rGasMixerSettings r12
alias rGasTankPressure r13

# Initialization.
initialize:
  s dGasMixer On 0
  s dGasMixer Setting 0
  s dPipeAnalyzer1 On 1
  s dPipeAnalyzer2 On 1

# Main execution loop with yield.
main:
  yield

# Optional logic to ignite the gas tank, remove if not required.
IgniteGas:
  l r0 dButton Setting
  beqz r0 loadState
  s dPipeIgniter Activate 1

# Load state of attached devices.
loadState:
  l rOxygenPressure dPipeAnalyzer1 Pressure
  l rOxygenTemperature dPipeAnalyzer1 Temperature
  l rVolatilePressure dPipeAnalyzer2 Pressure
  l rVolatileTemperature dPipeAnalyzer2 Temperature
  l rGasTankPressure dGasTank Pressure

# If the output Gas Tank is full (exceeded max pressure), shutdown mixing.
  bgt rGasTankPressure MaxGasTankPresure mixerOff

# If no input gas available, shutdown mixing.
  beqz rOxygenPressure mixerOff
  beqz rOxygenTemperature mixerOff
  beqz rVolatilePressure mixerOff
  beqz rVolatileTemperature mixerOff

# Compute the O2/H2 ratio (H2 = volatiles), assuming Oxygen is connected to the Mixer's input 1.
computeMixture:
  mul r0 rVolatileTemperature 2
  div r0 r0 rOxygenTemperature
  add r0 1 r0
  div rGasMixerSettings 100 r0

# Set the mixer ratio and turn on.
mixerSet:
  s dGasMixer Setting rGasMixerSettings
  s dGasMixer On 1
  j main

# Reset the mixer ratio and turn off.
mixerOff:
  s dGasMixer Setting 0
  s dGasMixer On 0
  j main