Topic       : The ATARI Compendium
Author      : Scott Sanders / JAY Software
Version     : 1.25 (20/6/2003)
Subject     : Documentation
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Index Size  : 32614
HCP-Version : 6
Compiled on : Atari
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View Ref-FileEsetGray()
EsetShift()
EsetSmear()
EsetBank()
EgetShift()                                                           XBIOS

Syntax

WORD EgetShift( VOID )

Function      EgetShift() returns the current mode of the video shifter.

Opcode        81 (0x51)

Availability  This call is available when the high word of the '_VDO'
              cookie has a value of 2.

Binding       move.w   #$51,-(sp)
              trap     #14
              addq.l   #2,sp

Return Value  EgetShift() returns a WORD bit array which is divided as
              follows:

              Mask Nm.  Bit(s)  Meaning

              ES_BANK     0-3   These bits determine the current color
                                bank being used by the TT (in all modes
                                with less than 256 colors). The macro
                                ColorBank() as defined below will extract
                                the current bank code.

                                #define ColorBank(x) ((x) & ES_BANK)

              -           4-7   Unused

              ES_MODE    8-10   These bits determine the current mode of
                                the TT video shifter as follows:

                                Name     Value
                                ST_LOW   0x0000
                                ST_MED   0x0100
                                ST_HIGH  0x0200
                                TT_MED   0x0300
                                TT_HIGH  0x0600
                                TT_LOW   0x0700

                                The current shifter mode code can be
                                extracted with the following macro:

                                #define ScreenMode(x) ((x) & ES_MODE)

              -            11   Unused

              ES_GRAY      12   This bit determines if the TT video
                                shifter is currently in grayscale mode.
                                The following macro can be used to extract
                                this information:

                                #define IsGrayMode(x) ((x) & ES_GRAY)

              -         13-14   Unused

              ES_SMEAR     15   If this bit is set, the TT video shifter
                                is currently in smear mode. The following
                                macro can be used to extract this
                                information:

                                #define IsSmearMode(x) ((x) & ES_SMEAR)

See Also      EsetGray(), EsetShift(), EsetSmear(), EsetBank()