mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-26 22:50:22 +00:00
Add horizontal BG1 offset support; frame lock demo to 60 fps
This commit is contained in:
Lucas Scharenbroich
parent
9cdba9a537
commit
1fcd4589f7
148
src/Actions.s
148
src/Actions.s
@ -1,108 +1,136 @@
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MoveLeft
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clc
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adc StartX ; Increment the virtual X-position
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jsr SetBG0XPos
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adc StartX ; Increment the virtual X-position
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jsr SetBG0XPos
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lda StartX
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lda StartX
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lsr
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jsr SetBG1XPos
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jsr SetBG1XPos
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jsr DoFrame
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jsr DoFrame
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rts
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MoveRight
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pha
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lda StartX
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lda StartX
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sec
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sbc 1,s
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bpl *+5
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lda #0
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jsr SetBG0XPos
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sbc 1,s
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bpl *+5
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lda #0
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jsr SetBG0XPos
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lda StartX
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lda StartX
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lsr
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jsr SetBG1XPos
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jsr SetBG1XPos
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jsr DoFrame
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jsr DoFrame
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pla
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rts
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MoveUp
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clc
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adc StartY ; Increment the virtual Y-position
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jsr SetBG0YPos
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adc StartY ; Increment the virtual Y-position
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jsr SetBG0YPos
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lda StartY
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lda StartY
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lsr
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jsr SetBG1YPos
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jsr SetBG1YPos
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jsr DoFrame
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jsr DoFrame
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rts
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MoveDown
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pha
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lda StartY
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lda StartY
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sec
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sbc 1,s
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bpl *+5
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lda #0
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jsr SetBG0YPos
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sbc 1,s
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bpl *+5
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lda #0
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jsr SetBG0YPos
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lda StartY
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lda StartY
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lsr
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jsr SetBG1YPos
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jsr SetBG1YPos
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jsr DoFrame
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jsr DoFrame
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pla
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rts
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; Very simple, scroll as fast as possible
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oldOneSecondCounter ds 2
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frameCount ds 2
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oldOneSecondCounter ds 2
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frameCount ds 2
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lastTick ds 2
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Demo
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lda OneSecondCounter
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sta oldOneSecondCounter
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stz frameCount
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lda OneSecondCounter
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sta oldOneSecondCounter
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stz frameCount
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:loop
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lda #1
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jsr MoveLeft
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inc frameCount
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ldal KBD_STROBE_REG
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bit #$0080
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beq :nokey
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and #$007F
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cmp #'s'
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bne :nokey
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PushLong #0
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_GetTick
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pla
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plx
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cmp lastTick ; Throttle to 60 fps
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beq :loop
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sta lastTick
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and #$003C ; An 4-step animation that fires every 16 ticks
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lsr
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sta BG1OffsetIndex ; Set the value
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lda #1
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jsr MoveLeft
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jsr DoFrame
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inc frameCount
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ldal KBD_STROBE_REG
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bit #$0080
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beq :nokey
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and #$007F
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cmp #'s'
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bne :nokey
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rts
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:nokey
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lda OneSecondCounter
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cmp oldOneSecondCounter
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beq :loop
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lda OneSecondCounter
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cmp oldOneSecondCounter
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beq :loop
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sta oldOneSecondCounter
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lda ScreenWidth
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cmp #150
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bcs :loop
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lda #FPSStr
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ldx #0 ; top-left corner
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ldy #$7777
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jsr DrawString
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lda frameCount
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ldx #4*4
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jsr DrawWord
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stz frameCount
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bra :loop
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FPSStr str 'FPS'
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sta oldOneSecondCounter
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lda ScreenWidth
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cmp #150
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bcs :loop
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lda #FPSStr
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ldx #0 ; top-left corner
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ldy #$7777
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jsr DrawString
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lda frameCount
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ldx #4*4
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jsr DrawWord
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stz frameCount
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bra :loop
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FPSStr str 'FPS'
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@ -42,7 +42,7 @@ SHR_PALETTES equ $E19E00
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tiledata ext
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; Feature flags
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NO_INTERRUPTS equ 1 ; turn off for crossrunner debugging
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NO_INTERRUPTS equ 0 ; turn off for crossrunner debugging
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; Typical init
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@ -873,6 +873,7 @@ BlitInit
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stz BG1StartXMod164
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stz BG1StartY
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stz BG1StartYMod208
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stz BG1OffsetIndex
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]step equ 0
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lup 13
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@ -1283,6 +1284,11 @@ qtRec adrl $0000
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@ -6,31 +6,31 @@ _InitBG1
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SetBG1XPos
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cmp BG1StartX
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beq :out ; Easy, if nothing changed, then nothing changes
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beq :out ; Easy, if nothing changed, then nothing changes
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ldx BG1StartX ; Load the old value (but don't save it yet)
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sta BG1StartX ; Save the new position
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ldx BG1StartX ; Load the old value (but don't save it yet)
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sta BG1StartX ; Save the new position
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lda #DIRTY_BIT_BG1_X
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tsb DirtyBits ; Check if the value is already dirty, if so exit
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bne :out ; without overwriting the original value
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tsb DirtyBits ; Check if the value is already dirty, if so exit
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bne :out ; without overwriting the original value
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stx OldBG1StartX ; First change, so preserve the value
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stx OldBG1StartX ; First change, so preserve the value
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:out rts
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SetBG1YPos
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cmp BG1StartY
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beq :out ; Easy, if nothing changed, then nothing changes
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beq :out ; Easy, if nothing changed, then nothing changes
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ldx BG1StartY ; Load the old value (but don't save it yet)
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sta BG1StartY ; Save the new position
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ldx BG1StartY ; Load the old value (but don't save it yet)
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sta BG1StartY ; Save the new position
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lda #DIRTY_BIT_BG1_Y
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tsb DirtyBits ; Check if the value is already dirty, if so exit
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bne :out ; without overwriting the original value
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tsb DirtyBits ; Check if the value is already dirty, if so exit
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bne :out ; without overwriting the original value
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stx OldBG1StartY ; First change, so preserve the value
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stx OldBG1StartY ; First change, so preserve the value
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:out rts
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@ -58,23 +58,19 @@ _ApplyBG1XPos
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sbc #164
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tay
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phd ; save the direct page because we are going to switch to the
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lda BlitterDP ; blitter direct page space and fill in the addresses
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phd ; save the direct page because we are going to switch to the
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lda BlitterDP ; blitter direct page space and fill in the addresses
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tcd
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ldx #162
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tya
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:loop
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tya
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clc
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adc affine,x
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sta 00,x ; store the value
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dey
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dey
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sta 00,x ; store the value
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dec
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dec
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bpl :nowrap
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tya
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clc
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adc #164
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tay
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:nowrap
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dex
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@ -83,40 +79,6 @@ _ApplyBG1XPos
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pld
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rts
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affine ds 164
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; Pass accumulator to set every (A / 256) pitch
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SetAffine
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ldx #0
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ldy #0
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and #$00FF
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pha ; step size
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pea $0000
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:loop lda 1,s
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clc
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adc 3,s
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cmp #256
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bcc :skip
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tya
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clc
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adc #256 ; Move to next BG1 line
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tay
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:skip and #$00FF ; always clamp to 256
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sta 1,s
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tya
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sta affine,x
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inx
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inx
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cpx #164
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bcc :loop
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pla
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pla
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rts
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_ClearBG1Buffer
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phb
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pha
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@ -150,10 +112,10 @@ _ApplyBG1YPos
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lda BG1StartY
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jsr Mod208
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sta BG1StartYMod208
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sta :ytbl_idx ; Start copying from the first entry in the table
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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 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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@ -162,13 +124,13 @@ _ApplyBG1YPos
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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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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
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plb ; This is the bank that will receive the updates
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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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@ -179,24 +141,24 @@ _ApplyBG1YPos
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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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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 in the BG1YTable
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lda :ytbl_idx ; Read from this location in the BG1YTable
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asl
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jsr CopyBG1YTableToBG1Addr
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jsr 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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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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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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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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@ -285,12 +247,28 @@ CopyBG1YTableToBG1Addr
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:none rts
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; Unrolled copy routine to move BG1YTable entries into BG1_ADDR position with an additional
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; shift
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; shift. This has to be split into two
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;
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; A = index into the BG1YTable array (x2)
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; Y = starting line * $1000
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; X = number of lines (x2)
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CopyBG1YTableToBG1Addr2
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phy ; save the registers
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phx
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phb
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phk ; restore access to this bank
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plb
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ldy BG1OffsetIndex ; Get the offset and save the values
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jsr SaveBG1OffsetValues
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plb
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plx ; x is used directly in this routine
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ply
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jsr ApplyBG1OffsetValues
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rts
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SaveBG1OffsetValues
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jmp (:tbl,x)
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:tbl da :none
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da :do01,:do02,:do03,:do04
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@ -314,54 +292,54 @@ CopyBG1YTableToBG1Addr2
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:do08 tax
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bra :x08
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:do16 tax
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ldal BG1YTable+30,x
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adcl BG1YOffsetTable+30,x
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sta BG1_ADDR+$F000,y
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:x15 ldal BG1YTable+28,x
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adcl BG1YOffsetTable+28,x
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sta BG1_ADDR+$E000,y
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:x14 ldal BG1YTable+26,x
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adcl BG1YOffsetTable+26,x
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sta BG1_ADDR+$D000,y
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:x13 ldal BG1YTable+24,x
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adcl BG1YOffsetTable+24,x
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sta BG1_ADDR+$C000,y
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:x12 ldal BG1YTable+22,x
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adcl BG1YOffsetTable+22,x
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sta BG1_ADDR+$B000,y
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:x11 ldal BG1YTable+20,x
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adcl BG1YOffsetTable+20,x
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sta BG1_ADDR+$A000,y
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:x10 ldal BG1YTable+18,x
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adcl BG1YOffsetTable+18,x
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sta BG1_ADDR+$9000,y
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:x09 ldal BG1YTable+16,x
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adcl BG1YOffsetTable+16,x
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sta BG1_ADDR+$8000,y
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:x08 ldal BG1YTable+14,x
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adcl BG1YOffsetTable+14,x
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sta BG1_ADDR+$7000,y
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:x07 ldal BG1YTable+12,x
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adcl BG1YOffsetTable+12,x
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sta BG1_ADDR+$6000,y
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:x06 ldal BG1YTable+10,x
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adcl BG1YOffsetTable+10,x
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sta BG1_ADDR+$5000,y
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:x05 ldal BG1YTable+08,x
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adcl BG1YOffsetTable+08,x
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sta: BG1_ADDR+$4000,y
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:x04 ldal BG1YTable+06,x
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adcl BG1YOffsetTable+06,x
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sta BG1_ADDR+$3000,y
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:x03 ldal BG1YTable+04,x
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adcl BG1YOffsetTable+04,x
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sta BG1_ADDR+$2000,y
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:x02 ldal BG1YTable+02,x
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adcl BG1YOffsetTable+02,x
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sta BG1_ADDR+$1000,y
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:x01 ldal BG1YTable+00,x
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adcl BG1YOffsetTable+00,x
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sta: BG1_ADDR+$0000,y
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lda BG1YTable+30,x
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adc BG1YOffsetTable+30,y
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sta BG1YCache+30
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:x15 lda BG1YTable+28,x
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adc BG1YOffsetTable+28,y
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sta BG1YCache+28
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:x14 lda BG1YTable+26,x
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adc BG1YOffsetTable+26,y
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sta BG1YCache+26
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:x13 lda BG1YTable+24,x
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adc BG1YOffsetTable+24,y
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sta BG1YCache+24
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:x12 lda BG1YTable+22,x
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adc BG1YOffsetTable+22,y
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sta BG1YCache+22
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:x11 lda BG1YTable+20,x
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adc BG1YOffsetTable+20,y
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sta BG1YCache+20
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:x10 lda BG1YTable+18,x
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adc BG1YOffsetTable+18,y
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sta BG1YCache+18
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:x09 lda BG1YTable+16,x
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adc BG1YOffsetTable+16,y
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sta BG1YCache+16
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:x08 lda BG1YTable+14,x
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adc BG1YOffsetTable+14,y
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sta BG1YCache+14
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:x07 lda BG1YTable+12,x
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adc BG1YOffsetTable+12,y
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sta BG1YCache+12
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:x06 lda BG1YTable+10,x
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adc BG1YOffsetTable+10,y
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sta BG1YCache+10
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:x05 lda BG1YTable+08,x
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adc BG1YOffsetTable+08,y
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sta BG1YCache+08
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:x04 lda BG1YTable+06,x
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adc BG1YOffsetTable+06,y
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sta BG1YCache+06
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:x03 lda BG1YTable+04,x
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adc BG1YOffsetTable+04,y
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sta BG1YCache+04
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:x02 lda BG1YTable+02,x
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adc BG1YOffsetTable+02,y
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sta BG1YCache+02
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:x01 lda BG1YTable+00,x
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adc BG1YOffsetTable+00,y
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sta BG1YCache+00
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:none rts
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:do07 tax
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bra :x07
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@ -379,62 +357,48 @@ CopyBG1YTableToBG1Addr2
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bra :x01
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||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
ApplyBG1OffsetValues
|
||||
jmp (:tbl,x)
|
||||
:tbl da :none
|
||||
da :do01,:do02,:do03,:do04
|
||||
da :do05,:do06,:do07,:do08
|
||||
da :do09,:do10,:do11,:do12
|
||||
da :do13,:do14,:do15,:do16
|
||||
:do16 ldal BG1YCache+30
|
||||
sta BG1_ADDR+$F000,y
|
||||
:do15 ldal BG1YCache+28
|
||||
sta BG1_ADDR+$E000,y
|
||||
:do14 ldal BG1YCache+26
|
||||
sta BG1_ADDR+$D000,y
|
||||
:do13 ldal BG1YCache+24
|
||||
sta BG1_ADDR+$C000,y
|
||||
:do12 ldal BG1YCache+22
|
||||
sta BG1_ADDR+$B000,y
|
||||
:do11 ldal BG1YCache+20
|
||||
sta BG1_ADDR+$A000,y
|
||||
:do10 ldal BG1YCache+18
|
||||
sta BG1_ADDR+$9000,y
|
||||
:do09 ldal BG1YCache+16
|
||||
sta BG1_ADDR+$8000,y
|
||||
:do08 ldal BG1YCache+14
|
||||
sta BG1_ADDR+$7000,y
|
||||
:do07 ldal BG1YCache+12
|
||||
sta BG1_ADDR+$6000,y
|
||||
:do06 ldal BG1YCache+10
|
||||
sta BG1_ADDR+$5000,y
|
||||
:do05 ldal BG1YCache+08
|
||||
sta: BG1_ADDR+$4000,y
|
||||
:do04 ldal BG1YCache+06
|
||||
sta BG1_ADDR+$3000,y
|
||||
:do03 ldal BG1YCache+04
|
||||
sta BG1_ADDR+$2000,y
|
||||
:do02 ldal BG1YCache+02
|
||||
sta BG1_ADDR+$1000,y
|
||||
:do01 ldal BG1YCache+00
|
||||
sta: BG1_ADDR+$0000,y
|
||||
:none rts
|
||||
|
||||
BG1YCache ds 32
|
||||
|
||||
|
||||
|
||||
|
||||
@ -35,6 +35,8 @@ BG1StartYMod208 equ 46
|
||||
OldBG1StartX equ 48
|
||||
OldBG1StartY equ 50
|
||||
|
||||
BG1OffsetIndex equ 52
|
||||
|
||||
BankLoad equ 128
|
||||
|
||||
bstk equ 208 ; 16-byte stack to push bank addresses
|
||||
@ -80,5 +82,6 @@ DIRTY_BIT_BG1_Y equ $0008
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
@ -238,6 +238,13 @@ BG1YTable lup 208
|
||||
]step = ]step+256
|
||||
--^
|
||||
|
||||
BG1YOffsetTable ds 208*2*2
|
||||
; Repeat
|
||||
BG1YOffsetTable lup 26
|
||||
dw 1,1,1,1,2,2,2,2,1,1,1,1,0,0,0,0
|
||||
--^
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user