DAC: Difference between revisions

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* Screen 0 and 9 can use up to 64 DAC color hues. Only attributes 0 to 5 and 7 can have RGB values altered using [[OUT]].
* Screen 0 and 9 can use up to 64 DAC color hues. Only attributes 0 to 5 and 7 can have RGB values altered using [[OUT]].
* [[PALETTE]] swap statements can assign one attribute's DAC color setting to another attribute color in [[SCREEN]]s 0 to 9.
* [[PALETTE]] swap statements can assign one attribute's DAC color setting to another attribute color in [[SCREEN]]s 0 to 9.
* Screen attributes 0 to 5 and 7 can have their RGB settings altered using OUT as shown in '''Bold''' below:  
* Screen attributes 0 to 5 and 7 can have their RGB settings altered using OUT as shown in '''Bold''' below:
{{WhiteStart}}
{{WhiteStart}}
             '''''SCREEN 0 or 9                    SCREEN 7'''''
             '''''SCREEN 0 or 9                    SCREEN 7'''''
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''Example 1:'' Changing the DAC attributes to use [[OUT]] for custom colors.
''Example 1:'' Changing the DAC attributes to use [[OUT]] for custom colors.
{{CodeStart}} '' ''
{{CodeStart}}
  {{Cl|SCREEN (statement)|SCREEN}} 9  'use 0, 7 or 9 only"
  {{Cl|SCREEN (statement)|SCREEN}} 9  'use 0, 7 or 9 only"
  InitDAC% = {{Cl|INP}}({{Cl|&H}}3DA)    ' prepare DAC port for access
  InitDAC% = {{Cl|INP}}({{Cl|&H}}3DA)    ' prepare DAC port for access
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  {{Cl|OUT}} {{Cl|&H}}3C0, 32            ' close port access
  {{Cl|OUT}} {{Cl|&H}}3C0, 32            ' close port access
{{CodeEnd}}
{{CodeEnd}}
:''Explanation:'' The procedure is a MUST to import 4 BPP bitmap colors in SCREEN 7 or 9. The InitDAC% value is not used, but that code line opens the DAC color port. Now all color attributes 0 to 15 can be used for custom or imported bitmap RGB color settings.  
:''Explanation:'' The procedure is a MUST to import 4 BPP bitmap colors in SCREEN 7 or 9. The InitDAC% value is not used, but that code line opens the DAC color port. Now all color attributes 0 to 15 can be used for custom or imported bitmap RGB color settings.




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{{CodeStart}}
{{CodeStart}}
  D = {{Cl|INP}}(&H3DA)    'prepares port for access
  D = {{Cl|INP}}(&H3DA)    'prepares port for access
  {{Cl|OUT}} &H3C0, &H30  
  {{Cl|OUT}} &H3C0, &H30
  {{Cl|OUT}} &H3C0, 4 '' ''
  {{Cl|OUT}} &H3C0, 4
{{CodeEnd}}
{{CodeEnd}}
:''Explanation:'' Make attributes 8-15 available to both foreground AND background colors. In other words it will make fullscreen behave like windowed mode. For the same effect in QB64, use [[_BLINK]] OFF.
:''Explanation:'' Make attributes 8-15 available to both foreground AND background colors. In other words it will make fullscreen behave like windowed mode. For the same effect in QB64, use [[_BLINK]] OFF.
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{{CodeStart}}
{{CodeStart}}
  D = {{Cl|INP}}(&H3DA)    'prepares port for access
  D = {{Cl|INP}}(&H3DA)    'prepares port for access
  {{Cl|OUT}} &H3C0, &H30  
  {{Cl|OUT}} &H3C0, &H30
  {{Cl|OUT}} &H3C0, 12 '' ''
  {{Cl|OUT}} &H3C0, 12
{{CodeEnd}}
{{CodeEnd}}
:'''NOTE: QB64''' allows blinking mode in both fullscreen and windowed modes '''without''' using the code above. To reenable blinking in QB64 after using [[_BLINK]] OFF, use [[_BLINK]] ON.
:'''NOTE: QB64''' allows blinking mode in both fullscreen and windowed modes '''without''' using the code above. To reenable blinking in QB64 after using [[_BLINK]] OFF, use [[_BLINK]] ON.
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''See also:''  
''See also:''


* [[SCREEN (statement)|SCREEN]], [[COLOR]]  
* [[SCREEN (statement)|SCREEN]], [[COLOR]]
* [[PALETTE]]
* [[PALETTE]]


Revision as of 01:24, 23 January 2023

  DAC stands for the QBasic Digital to Analog Converter color attributes used in screens 0, 7 and 9.


IMPORTANT: QB64 screens do not use the DAC index!
  • DAC colors are preset and cannot be changed in QBasic easily(see example).
  • DAC color attribute settings cannot be changed using PALETTE or OUT RGB statements.
  • Screen 0 and 9 can use up to 64 DAC color hues. Only attributes 0 to 5 and 7 can have RGB values altered using OUT.
  • PALETTE swap statements can assign one attribute's DAC color setting to another attribute color in SCREENs 0 to 9.
  • Screen attributes 0 to 5 and 7 can have their RGB settings altered using OUT as shown in Bold below:

Template:WhiteStart 

           SCREEN 0 or 9                     SCREEN 7
       Attribute = DAC setting         Attribute = DAC setting

  0 to 5 = 0 to 5  0 to 5 = 0 to 5    6 = 20 6 = 6 

               7 = 7                           7 = 7
               8 = 56                          8 = 16

   9 = 57 9 = 17 

              10 = 58                         10 = 18
              11 = 59                         11 = 19
              12 = 60                         12 = 20
              13 = 61                         13 = 21
              14 = 62                         14 = 22
              15 = 63                         15 = 23

   OUT can change RGB intensities where the DAC value matches the attribute value.

Template:WhiteEnd

Example 1: Changing the DAC attributes to use OUT for custom colors. 

 SCREEN 9   'use 0, 7 or 9 only"
 InitDAC% = INP(&H3DA)    ' prepare DAC port for access
 FOR attribute% = 6 TO 15 ' attributes 0 to 5 are already non-DAC
    OUT &H3C0, attribute% ' send attribute to change
    OUT &H3C0, attribute% ' change DAC value to normal number
 NEXT attribute%"
 OUT &H3C0, 32            ' close port access
Explanation: The procedure is a MUST to import 4 BPP bitmap colors in SCREEN 7 or 9. The InitDAC% value is not used, but that code line opens the DAC color port. Now all color attributes 0 to 15 can be used for custom or imported bitmap RGB color settings.


Example 2: Disabling blinking colors in fullscreen SCREEN 0 mode enabling high intensity only. (DAC) 

 D = INP(&H3DA)    'prepares port for access
 OUT &H3C0, &H30
 OUT &H3C0, 4
Explanation: Make attributes 8-15 available to both foreground AND background colors. In other words it will make fullscreen behave like windowed mode. For the same effect in QB64, use _BLINK OFF.

Enabling: The following code disables above code and returns SCREEN 0 blinking to normal. 

 D = INP(&H3DA)    'prepares port for access
 OUT &H3C0, &H30
 OUT &H3C0, 12
NOTE: QB64 allows blinking mode in both fullscreen and windowed modes without using the code above. To reenable blinking in QB64 after using _BLINK OFF, use _BLINK ON.


See also:


Navigation:
Main Page with Articles and Tutorials
Keyword Reference - Alphabetical
Keyword Reference - By usage
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