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Make use of the IRQ to swap view and draw pages when they aren't visible.
git-svn-id: svn://svn.cc65.org/cc65/trunk@4145 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -67,7 +67,7 @@
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.addr CIRCLE
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.addr TEXTSTYLE
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.addr OUTTEXT
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.addr 0 ; IRQ entry is unused
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.addr IRQ
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; ------------------------------------------------------------------------
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@ -104,6 +104,11 @@ TEXTMAGY: .res 1
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TEXTDIR: .res 1
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BGINDEX: .res 1 ; Pen to use for text background
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; Double buffer IRQ stuff
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DRAWPAGE: .res 1
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SWAPREQUEST: .res 1
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VBLHOOK: .res 3
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text_bitmap: .res 8*(1+20+1)+1
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; 8 rows with (one offset-byte plus 20 character bytes plus one fill-byte) plus one 0-offset-byte
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@ -161,6 +166,10 @@ INSTALL:
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sta TEXTMAGX
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sta TEXTMAGY
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stz BGINDEX
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stz DRAWPAGE
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stz SWAPREQUEST
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lda #$60 ; rts op-code
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sta VBLHOOK
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rts
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@ -228,23 +237,86 @@ GETERROR:
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; To do a flip-screen call tgi_ioctl(1, 0)
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;
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; To set the background index for text outputs call tgi_ioctl(2, bgindex)
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;
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; To set the frame rate for the display hardware call tgi_ioctl(3, rate)
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;
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; To make a request for swapping the display buffers call tgi_ioctl(4, dataptr)
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; If the value of the char pointed to by the dataptr is 0 then fill in the
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; value of the char with the current state of the swap buffer 0 = idle, 1 = busy
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; If the value is not 0 then activate the swap function at next VBL interrupt
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;
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; Set an address for a subroutine you want to call at every VBL
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; tgi_ioctl(5, hook)
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CONTROL:
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cmp #2
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bne @L0
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lda ptr1
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sta BGINDEX
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pha ; Almost all control routines succeed
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lda #TGI_ERR_OK
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sta ERROR
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pla
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cmp #5
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bne ControlSwapRequest
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lda ptr1 ; Set IRQ routine to be called at VBL
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sta VBLHOOK+1
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lda ptr1+1
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sta VBLHOOK+2
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lda #$43 ; jmp op-code
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sta VBLHOOK
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rts
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@L0:
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ControlSwapRequest:
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cmp #4
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bne ControlFramerate
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lda ptr1 ; Swap request
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bne @L0
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lda SWAPREQUEST
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rts
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@L0: sta SWAPREQUEST
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rts
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ControlFramerate:
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cmp #3
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bne ControlTextBG
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cmp #75 ; Set framerate
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beq rate75
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cmp #60
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beq rate60
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cmp #50
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beq rate50
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lda #TGI_ERR_INV_ARG
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sta ERROR
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rts
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rate50: lda #$bd ; 50 Hz
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ldx #$31
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bra setRate
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rate60: lda #$9e ; 60 Hz
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ldx #$29
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bra setRate
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rate75: lda #$7e ; 75 Hz
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ldx #$20
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setRate:
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sta HTIMBKUP
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stx PBKUP
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rts
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ControlTextBG:
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cmp #2
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bne ControlFlipScreen
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lda ptr1 ; Set text background color
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sta BGINDEX
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rts
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ControlFlipScreen:
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cmp #1
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bne @L2
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lda __sprsys
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bne ControlDrawSprite
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lda __sprsys ; Flip screen
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eor #8
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sta __sprsys
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sta SPRSYS
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lda __viddma
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eor #2
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sta __viddma
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@ -252,7 +324,7 @@ CONTROL:
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ldy VIEWPAGEL
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ldx VIEWPAGEH
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and #2
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beq @L1
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beq NotFlipped
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clc
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tya
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adc #<8159
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@ -260,13 +332,12 @@ CONTROL:
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txa
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adc #>8159
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tax
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@L1:
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NotFlipped:
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sty DISPADRL
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stx DISPADRH
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lda #TGI_ERR_OK
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sta ERROR
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rts
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@L2:
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ControlDrawSprite:
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lda ptr1 ; Get the sprite address
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ldx ptr1+1
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@ -280,10 +351,10 @@ draw_sprite: ; Draw it in render buffer
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lda #1
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sta SPRGO
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stz SDONEACK
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@L3: stz CPUSLEEP
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@L0: stz CPUSLEEP
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lda SPRSYS
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lsr
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bcs @L3
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bcs @L0
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stz SDONEACK
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lda #TGI_ERR_OK
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sta ERROR
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@ -374,6 +445,44 @@ SETDRAWPAGE:
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stx DRAWPAGEH
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rts
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; ------------------------------------------------------------------------
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; IRQ: VBL interrupt handler
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;
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TIMER0_INTERRUPT = $01
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TIMER1_INTERRUPT = $02
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TIMER2_INTERRUPT = $04
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TIMER3_INTERRUPT = $08
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TIMER4_INTERRUPT = $10
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TIMER5_INTERRUPT = $20
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TIMER6_INTERRUPT = $40
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TIMER7_INTERRUPT = $80
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HBL_INTERRUPT = TIMER0_INTERRUPT
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VBL_INTERRUPT = TIMER2_INTERRUPT
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SERIAL_INTERRUPT = TIMER4_INTERRUPT
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IRQ:
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lda INTSET ; Poll all pending interrupts
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and #VBL_INTERRUPT
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bne IRQVBL
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clc ; Not a VBL interrupt - exit
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rts
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IRQVBL: sta INTRST ; Clear interrupt
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lda SWAPREQUEST
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bne @L0
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lda DRAWPAGE
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jsr SETVIEWPAGE
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lda DRAWPAGE
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eor #1
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sta DRAWPAGE
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jsr SETDRAWPAGE
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stz SWAPREQUEST
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@L0:
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jsr VBLHOOK
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sec
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rts
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; ------------------------------------------------------------------------
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; SETCOLOR: Set the drawing color (in A). The new color is already checked
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; to be in a valid range (0..maxcolor-1).
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