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⌂ ∞ ▽ Revs on the BBC Micro

Main loop: MainDrivingLoop (Part 2 of 5)

       Name: MainDrivingLoop (Part 2 of 5)                           [Show more]
       Type: Subroutine
   Category: Main loop
    Summary: Main driving loop: The body of the main loop
  Deep dive: Program flow of the main game loop

    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file




.main5

                        \ The main driving loop starts here, and we loop back to
                        \ here from part 5

 JSR ProcessTime        \ Increment the timers and the main loop counter, and
                        \ set the speed for the next non-player drivers

 JSR ShowStartingLights \ If this is a race, show the starting lights on the
                        \ right of the screen

 JSR ProcessDrivingKeys \ Check for and process the main driving keys

 JSR ApplyDrivingModel  \ Apply the driving model to the player's car

 JSR GetTrackAndMarkers \ Calculate the coordinates for the track sides and
                        \ corner markers

 JSR MovePlayerOnTrack  \ Update the position of the player's car within the
                        \ current track segment

 JSR MovePlayerSegment  \ Move the player's car into the correct segment

 JSR UpdateLapTimers    \ Update the lap timers and display timer-related
                        \ messages at the top of the screen

 JSR MakeDrivingSounds  \ Make the relevant sounds for the engine and tyres

 JSR ResetTrackLines    \ Reset the track lines below the horizon in the track
                        \ view

 JSR DrawTrack          \ Draw the track into the screen buffer

 JSR MakeDrivingSounds  \ Make the relevant sounds for the engine and tyres

 JSR SetBackground      \ Set the background colour for any track lines in the
                        \ track view that do not currently have a background set

 JSR BuildRoadSign      \ Build the road sign (if one is visible)

 LDX #23                \ Draw the road sign we just built
 JSR DrawCarOrSign

 JSR DrawCornerMarkers  \ Draw any visible corner markers

 JSR MoveAndDrawCars    \ Move the cars around the track and draw any that are
                        \ visible, up to a maximum of five

 JSR CopyTyreDashEdges  \ Copy the pixels from the edges of the left tyre and
                        \ right dashboard so they can be used when drawing the
                        \ track view around the tyres and dashboard, and fill
                        \ the blocks to the right of the edges with the
                        \ appropriate content

 JSR UpdateMirrors      \ Update the view in the wing mirrors

 JSR MakeDrivingSounds  \ Make the relevant sounds for the engine and tyres

 JSR MoveHorizon        \ Move the position of the horizon palette switch up or
                        \ down, depending on the current track pitch angle

 JSR ProcessContact     \ Process any car-on-car contact, if there has been any

 JSR CheckForCrash      \ Check to see if we have crashed into the fence, and if
                        \ so, display the fence, make the crash sound and set
                        \ crashedIntoFence = &FF

 JSR DrawTrackView      \ Copy the data from the dash data blocks to the screen
                        \ to draw the track view, fitting it around the tyres
                        \ and dashboard