mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-17 08:05:15 +00:00
Working through integration bugs
* Gave active list dedicated direct page space * Change active list bit test from ror to asl to avoid barrel shift * Various address fixes
This commit is contained in:
Lucas Scharenbroich
parent
7f9f4de228
commit
8b9415a7a5
@ -84,12 +84,11 @@ LastRender equ 96 ; Record which reder function was last
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; DamagedSprites equ 98
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SpriteMap equ 100 ; Bitmap of open sprite slots.
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ActiveSpriteCount equ 102
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Next equ 104
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BankLoad equ 128
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BankLoad equ 104
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Next equ 106
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activeSpriteList equ 128 ; 32 bytes for the active sprite list (can persist across frames)
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AppSpace equ 160 ; 16 bytes of space reserved for application use
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tiletmp equ 178 ; 16 bytes of temp storage for the tile renderers
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blttmp equ 192 ; 32 bytes of local cache/scratch space for blitter
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24
src/Render.s
24
src/Render.s
@ -46,7 +46,7 @@
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; edges of the rendered play field.
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; The render function is the point of committment -- most of the APIs that set sprintes and
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; The render function is the point of committment -- most of the APIs that set sprites and
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; update coordinates are lazy; they simply save the value and set a dirty flag in the
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; DirtyBits word.
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;
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@ -78,11 +78,13 @@ _Render
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jsr _ApplyBG0XPosPre
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jsr _ApplyBG1XPosPre
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nop
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jsr _RenderSprites ; Once the BG0 X and Y positions are committed, update sprite data
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jsr _UpdateBG0TileMap ; and the tile maps. These subroutines build up a list of tiles
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jsr _UpdateBG1TileMap ; that need to be updated in the code field
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nop
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jsr _ApplyTiles ; This function actually draws the new tiles into the code field
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jsr _ApplyBG0XPos ; Patch the code field instructions with exit BRA opcode
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@ -199,6 +201,14 @@ _RenderDirtyTile
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jsr BuildActiveSpriteArray ; Build the sprite index list from the bit field
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lda TileStore+TS_VBUFF_ARRAY_ADDR,y ; Scratch space
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sta _SPR_X_REG
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phy
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ldy spriteIdx
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lda (_SPR_X_REG),y
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sta _SPR_X_REG
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ply
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; ldx TileStore+TS_SPRITE_ADDR,y
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; stx _SPR_X_REG
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@ -276,7 +286,11 @@ _TBDirtySpriteTile_VH
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jsr _TBCopyTileDataToCBuffV
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jmp _TBApplyDirtySpriteData
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; Just copy in the data from the first sprite
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_TBApplyDirtySpriteData
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_TBApplyDirtySpriteData0
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ldx _SPR_X_REG ; set to the unaligned tile block address in the sprite plane
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]line equ 0
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@ -320,16 +334,16 @@ BuildActiveSpriteArray
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]step equ 0
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lup 4
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ror
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lsr
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bcc :skip_1
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pea ]step
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:skip_1 ror
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:skip_1 lsr
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bcc :skip_2
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pea ]step+2
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:skip_2 ror
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:skip_2 lsr
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bcc :skip_3
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pea ]step+4
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:skip_3 ror
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:skip_3 lsr
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bcc :skip_4
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pea ]step+6
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:skip_4 beq :end_1
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23
src/Sprite.s
23
src/Sprite.s
@ -36,14 +36,15 @@ VBUFF_TILE_ROW_BYTES equ 8*VBUFF_STRIDE_BYTES
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VBUFF_SPRITE_STEP equ VBUFF_TILE_ROW_BYTES*3
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VBUFF_SPRITE_START equ {8*VBUFF_TILE_ROW_BYTES}+4
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ldx #{MAX_SPRITES-1}*2
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ldx #0
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lda #VBUFF_SPRITE_START
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clc
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:loop4 sta _Sprites+VBUFF_ADDR,x
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adc #VBUFF_SPRITE_STEP
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dex
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dex
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bpl :loop4
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inx
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inx
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cpx #MAX_SPRITES*2
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bcc :loop4
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; Precalculate some bank values
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jsr _CacheSpriteBanks
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@ -231,8 +232,6 @@ _ClearSpriteFromTileStore
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; Tile Store locations are marked as dirty. It is important to recognize that the sprites themselves
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; can be marked dirty, and the underlying tiles in the tile store are independently marked dirty.
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activeSpriteList equ blttmp
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phase1 dw :phase1_0
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dw :phase1_1,:phase1_2,:phase1_3,:phase1_4
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dw :phase1_5,:phase1_6,:phase1_7,:phase1_8
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@ -408,16 +407,16 @@ RebuildSpriteArray
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pea $FFFF ; end-of-list marker
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]step equ 0
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lup 4
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ror
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lsr
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bcc :skip_1
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pea ]step
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:skip_1 ror
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:skip_1 lsr
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bcc :skip_2
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pea ]step+2
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:skip_2 ror
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:skip_2 lsr
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bcc :skip_3
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pea ]step+4
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:skip_3 ror
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:skip_3 lsr
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bcc :skip_4
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pea ]step+6
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:skip_4 beq :end_1
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@ -432,7 +431,7 @@ RebuildSpriteArray
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:loop
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pla
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bmi :out
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sta blttmp,x
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sta activeSpriteList,x
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inx
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inx
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bra :loop
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@ -545,7 +544,7 @@ _CacheSpriteBanks
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rts
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; This is 13 blocks wide
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SPRITE_PLANE_SPAN equ 52 ; 256
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SPRITE_PLANE_SPAN equ VBUFF_STRIDE_BYTES ; 52
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; A = x coordinate
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; Y = y coordinate
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@ -151,17 +151,19 @@ _MarkDirtySprite
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and #$FFFE ; Same pre-multiply by 2 for later
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sta ColLeft
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; Sneak a pre-calculation here. Calculate the tile-aligned upper-left corner of the sprite in the sprite plane.
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; We can reuse this in all of the routines below. This is not the (x,y) of the sprite itself, but
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; the corner of the tile it overlaps with, relative to the sprite's VBUFF_ADDR.
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; Calculate the modified origin address for the sprite. We need to look at the sprite flip bits
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; to determine which of the four sprite stamps is the correct one to use. Then, offset that origin
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; based on the (x, y) and (startx, starty) positions.
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lda _Sprites+SPRITE_DISP,y ; Each stamp is 12 bytes
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and #$0006
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tax
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lda :stamp_step,x
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clc
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lda TileTop
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; adc #NUM_BUFF_LINES
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xba
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clc
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adc TileLeft
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sta VBuffOrigin ; Save once to use later (constant offsets)
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adc _Sprites+VBUFF_ADDR,y
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sta VBuffOrigin
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lda #^TileStore
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sta tmp1
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; Calculate the number of columns and dispatch
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@ -180,6 +182,7 @@ _MarkDirtySprite
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dw :mark3x1,:mark3x2,:mark3x3,mdsOut
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dw mdsOut,mdsOut,mdsOut,mdsOut
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:stamp_step dw 0,12,24,36
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; Dispatch to the calculated sizing
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; Begin a list of subroutines to cover all of the valid sprite size compinations. This is all unrolled code,
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@ -329,7 +332,7 @@ _MarkDirtySprite
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sta tmp0
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lda VBuffOrigin
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sta (tmp0),y
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sta [tmp0],y
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; lda VBuffOrigin ; This is an interesting case. The mapping between the tile store
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; adc #{0*4}+{0*256} ; and the sprite buffers changes as the StartX, StartY values change
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@ -360,7 +363,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{0*4}+{1*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -380,7 +383,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{0*4}+{2*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -401,7 +404,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{1*4}+{0*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -422,7 +425,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{1*4}+{1*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -443,7 +446,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{1*4}+{2*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -464,7 +467,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{2*4}+{0*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -485,7 +488,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{2*4}+{1*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -506,7 +509,7 @@ _MarkDirtySprite
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lda VBuffOrigin
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adc #{2*4}+{2*8*SPRITE_PLANE_SPAN}
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sta (tmp0),y
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sta [tmp0],y
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lda SpriteBit
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oral TileStore+TS_SPRITE_FLAG,x
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@ -8,13 +8,13 @@ DISP_MASK equ $00F9
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phx
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lda _Sprites+VBUFF_ADDR,y
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lda _Sprites+VBUFF_ADDR,x
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sta tmp1
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lda _Sprites+TILE_DATA_OFFSET,y
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lda _Sprites+TILE_DATA_OFFSET,x
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sta tmp2
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lda _Sprites+SPRITE_DISP,y
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lda _Sprites+SPRITE_DISP,x
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and #DISP_MASK ; dispatch to all of the different orientations
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sta tmp3
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@ -104,16 +104,30 @@ _RenderTileBG1
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;
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; Y = address of tile
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_RenderTile2
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pea >TileStore ; Need that addressing flexibility here. Callers responsible for restoring bank reg
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pea >TileStore ; Need that addressing flexibility here. Caller is responsible for restoring bank reg
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plb
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plb
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txy ; We can be better than this....
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lda TileStore+TS_TILE_ID,y ; build the finalized tile descriptor
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ldx TileStore+TS_SPRITE_FLAG,y ; This is a bitfield of all the sprites that intersect this tile, only care if non-zero or not
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; beq :nosprite
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beq :nosprite
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; ora #TILE_SPRITE_BIT
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; ldx TileStore+TS_SPRITE_ADDR,y ; TODO: collapse sprites
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txa
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jsr BuildActiveSpriteArray ; Build the max 4 array of active sprites for this tile
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sta ActiveSpriteCount
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lda TileStore+TS_VBUFF_ARRAY_ADDR,y ; Scratch space
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sta _SPR_X_REG
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phy
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ldy spriteIdx
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lda (_SPR_X_REG),y
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sta _SPR_X_REG
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ply
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lda TileStore+TS_TILE_ID,y
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ora #TILE_SPRITE_BIT
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; ldx TileStore+TS_VBUFF_ARRAY_ADDR,y
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; stx _SPR_X_REG
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:nosprite
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@ -757,11 +771,11 @@ _ApplyTiles
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bra :begin
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:loop
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; Retrieve the offset of the next dirty Tile Store items in the Y-register
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; Retrieve the offset of the next dirty Tile Store items in the X-register
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jsr _PopDirtyTile2
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; Call the generic dispatch with the Tile Store record pointer at by the Y-register.
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; Call the generic dispatch with the Tile Store record pointer at by the X-register.
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phb
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jsr _RenderTile2
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