Screen buffer: UseRowBuffer

       Name: UseRowBuffer                                            [Show more]
       Type: Subroutine
   Category: Screen buffer
    Summary: Configure the row buffer for use
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * PanLandscapeView calls UseRowBuffer
             * SetColumnBufferMax calls via rbuf1


 Other entry points:

   rbuf1                Set the minimum and maximum pitch angled for the buffer
                        type specified in Y (0 = row buffer, 1 = column buffer)


.UseRowBuffer

 LDA #0                 \ Call ConfigureBuffer with A = 0 to set up the screen
 JSR ConfigureBuffer    \ buffer for use as a row buffer

 LDY #0                 \ Set Y = 0 so we set the maximum and minimum pitch
                        \ angles for the row buffer in the following

.rbuf1

 LDA bufferMaxPitch,Y   \ Set maxPitchAngle to the maximum pitch angle allowed
 STA maxPitchAngle      \ in the buffer specified in Y

 LDA bufferMinPitch,Y   \ Set minPitchAngle to the minimum pitch angle allowed
 STA minPitchAngle      \ in the buffer specified in Y

 RTS                    \ Return from the subroutine