The colourPalettes variable - The Sentinel on the BBC Micro

       Name: colourPalettes                                          [Show more]
       Type: Variable
   Category: Graphics
    Summary: The logical colours for two mode 5 palettes
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * SetColourPalette uses colourPalettes
             * SpawnEnemies uses colourPalettes


 This table contains the logical colours that are set in the SetColourPalette
 routine when it is called with an argument with bit 7 set. This routine is
 only ever called with an argument of &83 or &87.

 If the argument to SetColourPalette is &83 then the palette is set to the
 correct colours for playing the current landscape. The colours are set in the
 SpawnEnemies routine when the landscape is generated. Colours 0 and 1 are
 always blue and black, but colours 2 and 3 are set to different physical
 colours depending on the number of enemies in the landscape. The different
 palettes are as follows:

   * Enemy count = 1: blue, black, white, green

   * Enemy count = 2: blue, black, yellow, red

   * Enemy count = 3: blue, black, cyan, yellow

   * Enemy count = 4: blue, black, red, cyan

   * Enemy count = 5: blue, black, white, red

   * Enemy count = 6: blue, black, yellow, cyan

   * Enemy count = 7: blue, black, cyan, red

   * Enemy count = 8: blue, black, red, yellow

 Landscape 0000 has one enemy, so the starting landscape is therefore in blue,
 black, white and green.

 If the argument to SetColourPalette is &87, the palette is set as follows:

   * Colour 0 = 4 (blue)

   * Colour 1 = 0 (black)

   * Colour 2 = 1 (red)

   * Colour 3 = 3 (yellow)

 This palette is fixed and is used for the title screens.


.colourPalettes

 EQUB 4, 0, 6, 3        \ Palette with SetColourPalette offset 3

 EQUB 4, 0, 1, 3        \ Palette with SetColourPalette offset 7
Graphics: colourPalettes
