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https://github.com/lscharen/iigs-game-engine.git
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Get vertical rotation scaling going
This commit is contained in:
Lucas Scharenbroich
parent
18da2546bd
commit
acf0276ff5
@ -40,7 +40,7 @@ _ApplyBG1XPosAngle
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pld
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rts
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_ApplyBG1YPosAngle
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_ApplyBG1YPosAngle_Orig
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:virt_line equ tmp0
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:lines_left equ tmp1
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:draw_count equ tmp2
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@ -222,3 +222,231 @@ SaveBG1AngleValues
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bra :x02
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:do01 tax
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bra :x01
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; Modified version that copies all of the values to an intermediate buffer and then into the
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; code field. Allows values to be transformed on the fly
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TmpAngleTbl ds 416
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_ApplyBG1YPosAngle
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:virt_line equ tmp0
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:lines_left equ tmp1
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:draw_count equ tmp2
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:ytbl_idx equ tmp3
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:angle_tbl equ tmp4
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:scale_ptr equ tmp5
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:lines_left_x2 equ tmp7
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:angle_ptr equ tmp8
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sty :angle_tbl
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lda BG1Scaling ; Set the scaling table
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and #$0007
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asl
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tax
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lda ScalingTables,x
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sta :scale_ptr
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lda #^ScalingTables
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sta :scale_ptr+2
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lda BG1StartYMod208
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sta :ytbl_idx ; Start copying from the first entry in the table
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lda StartYMod208 ; This is the base line of the virtual screen
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sta :virt_line ; Keep track of it
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lda ScreenHeight
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sta :lines_left
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asl
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sta :lines_left_x2
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; Copy out the y-values from the rotation table into a temporary buffer
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lda :ytbl_idx
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asl
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clc
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adc :angle_tbl
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sta :angle_ptr
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lda #^ANGLEBNK
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sta :angle_ptr+2
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phb
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phk
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plb
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ldx #0
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txy
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:loop0
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phy
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lda [:scale_ptr],y
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tay
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lda [:angle_ptr],y
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ply
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sta TmpAngleTbl,x
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sta TmpAngleTbl+2,x
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sta TmpAngleTbl+4,x
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sta TmpAngleTbl+6,x
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iny
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iny
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txa
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clc
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adc #8
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tax
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cpx :lines_left_x2
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bcc :loop0
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plb
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; Copy the rotation values into the code fields
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phb
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stz :ytbl_idx ; just copy from a fixed table
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:loop
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lda :virt_line
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asl
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tax
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ldal BTableLow,x ; Get the address of the first code field line
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tay
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sep #$20
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ldal BTableHigh,x
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pha ; push the bank on the stack
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plb
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rep #$20
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lda :virt_line
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and #$000F
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eor #$FFFF
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inc
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clc
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adc #16
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min :lines_left
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sta :draw_count ; Do this many lines
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asl
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tax
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; lda :ytbl_idx ; Read from this location (duplicate every 4 lines)
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; lsr
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; lsr
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; asl
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; clc
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; adc :angle_tbl
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; sec
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; sbc #ANGLEBNK
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; jsr CopyAngleYTableToBG1Addr ; or CopyBG1YTableToBG1Addr2
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lda :ytbl_idx ; Read from this location (duplicate every 4 lines)
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asl
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jsr CopyAngleTmpTableToBG1Addr ; or CopyBG1YTableToBG1Addr2
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lda :virt_line ; advance to the virtual line after the segment we just
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clc ; filled in
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adc :draw_count
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sta :virt_line
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lda :ytbl_idx ; advance the index into the YTable
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adc :draw_count
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sta :ytbl_idx
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lda :lines_left ; subtract the number of lines we just completed
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sec
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sbc :draw_count
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sta :lines_left
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jne :loop
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plb
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rts
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; Unrolled copy routine to move y_angle entries into BG1_ADDR position with an additional
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; shift. This has to be split into two
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;
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; A = index into the temp array (x2)
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; Y = starting line * $1000
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; X = number of lines (x2)
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CopyAngleTmpTableToBG1Addr
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; tax
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; ldal ANGLEBNK+XX,x
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; sta BG1_ADDR+$F000,y
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phx
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pha
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jsr SaveBG1AngleValues2
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pla
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plx ; x is used directly in this routine
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jmp ApplyBG1OffsetValues
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SaveBG1AngleValues2
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jmp (:tbl,x)
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:tbl da :none
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da :do01,:do02,:do03,:do04
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da :do05,:do06,:do07,:do08
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da :do09,:do10,:do11,:do12
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da :do13,:do14,:do15,:do16
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:do15 tax
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bra :x15
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:do14 tax
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bra :x14
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:do13 tax
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bra :x13
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:do12 tax
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bra :x12
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:do11 tax
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bra :x11
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:do10 tax
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bra :x10
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:do09 tax
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bra :x09
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:do08 tax
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bra :x08
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:do16 tax
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ldal TmpAngleTbl+30,x
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stal BG1YCache+30
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:x15 ldal TmpAngleTbl+28,x
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stal BG1YCache+28
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:x14 ldal TmpAngleTbl+26,x
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stal BG1YCache+26
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:x13 ldal TmpAngleTbl+24,x
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stal BG1YCache+24
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:x12 ldal TmpAngleTbl+22,x
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stal BG1YCache+22
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:x11 ldal TmpAngleTbl+20,x
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stal BG1YCache+20
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:x10 ldal TmpAngleTbl+18,x
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stal BG1YCache+18
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:x09 ldal TmpAngleTbl+16,x
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stal BG1YCache+16
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:x08 ldal TmpAngleTbl+14,x
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stal BG1YCache+14
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:x07 ldal TmpAngleTbl+12,x
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stal BG1YCache+12
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:x06 ldal TmpAngleTbl+10,x
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stal BG1YCache+10
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:x05 ldal TmpAngleTbl+08,x
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stal BG1YCache+08
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:x04 ldal TmpAngleTbl+06,x
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stal BG1YCache+06
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:x03 ldal TmpAngleTbl+04,x
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stal BG1YCache+04
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:x02 ldal TmpAngleTbl+02,x
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stal BG1YCache+02
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:x01 ldal TmpAngleTbl+00,x
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stal BG1YCache+00
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:none rts
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:do07 tax
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bra :x07
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:do06 tax
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bra :x06
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:do05 tax
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bra :x05
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:do04 tax
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bra :x04
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:do03 tax
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bra :x03
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:do02 tax
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bra :x02
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:do01 tax
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bra :x01
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