trogdor: add scroll down
This commit is contained in:
Vince Weaver
parent
8e82b8f44e
commit
d8be4e48c7
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@ -189,7 +189,7 @@ trogdor.o: trogdor.s \
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zp.inc hardware.inc qload.inc \
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graphics/trog00_trogdor.hgr.zx02 \
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hgr_sprite_big_mask.s horiz_scroll_simple.s hgr_copy_magnify.s \
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horiz_scroll_skip.s vertical_scroll.s hgr_copy_part.s
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horiz_scroll_skip.s vertical_scroll_down.s hgr_copy_part.s
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ca65 -o trogdor.o trogdor.s -l trogdor.lst
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@ -87,9 +87,6 @@ trog_no_music:
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; left tall 1212 roughly 10 frames (1/2 s)
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; left short 2 frames
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;======================================
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; left flame short 2 frames
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; clear to white
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ldy #$7f
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jsr hgr_clear_screen
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@ -100,10 +97,10 @@ trog_no_music:
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jsr hgr_page_flip
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lda #0
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lda #0 ; blank bg
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sta FLAME_BG
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lda #8
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lda #8 ; x-coords for two flames
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sta FLAME_L
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lda #24
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sta FLAME_R
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@ -137,9 +134,6 @@ trog_no_music:
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jsr hgr_clear_screen
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jsr hgr_page_flip
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; lda #24 ; 192/8
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; sta ANIMATE_COUNT
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lda #0
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sta COUNT
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@ -222,10 +216,26 @@ scroll_in_loop:
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lda #42
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jsr wait_ticks
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;=====================
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; do flames
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lda #1
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sta FLAME_BG
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jsr do_flames
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;=====================
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; done flames
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ldy #$7f
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jsr hgr_clear_screen
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jsr hgr_copy_left
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jsr hgr_page_flip
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lda #30
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jsr wait_ticks
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;======================================
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; dragon man
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@ -274,10 +284,15 @@ scroll_in_loop:
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jsr wait_ticks
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;==========================
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; dragon zoom
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lda #$60
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jsr hgr_copy_magnify
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;===========================
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; rapidly switch
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lda #12
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sta ANIMATE_COUNT
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rapid_switch:
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@ -289,6 +304,32 @@ rapid_switch:
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dec ANIMATE_COUNT
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bne rapid_switch
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;===h========================
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; scroll off screen
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; switch to page1
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ldy #$7f
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jsr hgr_clear_screen
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jsr hgr_copy_left
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jsr hgr_page_flip
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lda #0
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sta COUNT
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scroll_down_in_loop:
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jsr hgr_vertical_scroll_down_left
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lda COUNT
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clc
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adc #8
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sta COUNT
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cmp #200
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bne scroll_down_in_loop
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;=========================
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; clear to white screen
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ldy #$7f
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@ -503,8 +544,8 @@ trog04_graphics:
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.include "irq_wait.s"
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;hposn_low = $1e00
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;hposn_high = $1f00
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hposn_low = $1e00
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hposn_high = $1f00
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;.include "hgr_sprite_big_mask.s"
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;.include "horiz_scroll_simple.s"
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@ -513,6 +554,7 @@ trog04_graphics:
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;.include "vertical_scroll.s"
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;.include "hgr_copy_part.s"
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.include "vertical_scroll_down.s"
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.include "do_flames.s"
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;=========================================
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@ -0,0 +1,72 @@
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;=======================================
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; hgr_vertical scroll_down
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;=======================================
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; scrolls from $6000 to page1
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; jumps increments of 8 for speed
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;=======================================
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hgr_vertical_scroll_down_left:
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; lda #0
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; beq hgr_vertical_scroll_down_common
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hgr_vertical_scroll_down_right:
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; lda #20
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hgr_vertical_scroll_down_common:
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; sta vscroll_down_offset_smc+1
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hgr_vertical_scroll_down:
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ldx #183 ; start at bottom
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outer_vscroll_down_loop:
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lda hposn_low,X ; get page1 address
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sta INL ; set as output
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lda hposn_high,X
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sta INH
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txa ; get address of X+8
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clc ; and set as output
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adc #8
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tay
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lda hposn_low,y
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sta OUTL
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lda hposn_high,Y
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sta OUTH
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ldy #29 ; only scroll from 9..29
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inner_vscroll_down_loop:
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lda (INL),Y
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sta (OUTL),Y
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dey
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cpy #9
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bpl inner_vscroll_down_loop
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dex
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cpx #$FF
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bne outer_vscroll_down_loop
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;================================
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; copy in off screen
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; for now assume all white
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ldx #7 ; start at top
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outer_vscroll_down_loop2:
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lda hposn_low,X
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sta OUTL
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lda hposn_high,X
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sta OUTH
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ldy #39
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lda #$7f
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inner_vscroll_down_loop2:
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sta (OUTL),Y
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dey
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bpl inner_vscroll_down_loop2
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dex
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bpl outer_vscroll_down_loop2
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rts
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