mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-25 15:32:59 +00:00
Nearly complete integration of sprites into rendering function
This commit is contained in:
Lucas Scharenbroich
parent
8f0e82cb04
commit
631f40da23
@ -129,6 +129,25 @@ asr8 mac
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ror
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<<<
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; Inline macros for fast calculation of some internal values
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_TileStoreOffset mac
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lda ]2
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asl
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tay
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lda ]1
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asl ; Assume in range, so asl puts a 0 bit into the carry
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adc TileStoreYTable,y
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<<<
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_; Macro variant to calculate inline from any source
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_SpriteVBuffAddr mac
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lda ]2
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clc
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adc #NUM_BUFF_LINES
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xba
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adc ]1
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<<<
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; Macro to define script steps
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ScriptStep MAC
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IF #=]5
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12
src/Core.s
12
src/Core.s
@ -8,7 +8,7 @@
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use .\Defs.s
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; Feature flags
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NO_INTERRUPTS equ 0 ; turn off for crossrunner debugging
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NO_INTERRUPTS equ 1 ; turn off for crossrunner debugging
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NO_MUSIC equ 1 ; turn music + tool loading off
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; External data provided by the main program segment
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@ -342,7 +342,7 @@ ClearKbdStrobe sep #$20
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rep #$20
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rts
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; Read the keyboard and paddle controls and return in a game-cotroller-like format
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; Read the keyboard and paddle controls and return in a game-controller-like format
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ReadControl ENT
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pea $0000 ; low byte = key code, high byte = %------AB
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@ -352,8 +352,8 @@ ReadControl ENT
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beq :BNotDown
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lda #1
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ora 1,s
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sta 1,s
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ora 2,s
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sta 2,s
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:BNotDown
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ldal COMMAND_KEY_REG
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@ -361,8 +361,8 @@ ReadControl ENT
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beq :ANotDown
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lda #2
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ora 1,s
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sta 1,s
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ora 2,s
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sta 2,s
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:ANotDown
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ldal KBD_STROBE_REG ; read the keyboard
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@ -78,8 +78,8 @@ _Render
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jsr _ApplyBG0XPosPre
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jsr _ApplyBG1XPosPre
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; jsr _RenderSprites ; Once the BG0 X and Y positions are committed, update sprite data
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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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432
src/Sprite.s
432
src/Sprite.s
@ -28,13 +28,37 @@ InitSprites
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; This function looks at the sprite list and renders the sprite plane data into the appropriate
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; tiles in the code field
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forceSpriteFlag ds 2
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_RenderSprites
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; First step is to look at the StartX and StartY values. If the offsets have changed from the
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; last time that the frame was rederer, then we need to mark all of the sprites as dirty so that
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; the tiles that they were located at on the previous frame will be refreshed
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stz forceSpriteFlag
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lda StartX
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cmp OldStartX
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beq :no_chng_x
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lda #SPRITE_STATUS_DIRTY
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sta forceSpriteFlag
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:no_chng_x
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lda StartY
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cmp OldStartY
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beq :no_chng_y
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lda #SPRITE_STATUS_DIRTY
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sta forceSpriteFlag
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:no_chng_y
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; Second step is to scan the list of spries. A sprite is either clean or dirty. If it's dirty,
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; then its position had changed, so we need to add tiles to the dirty queue to make sure the
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; playfield gets update. If it's clean, we can skip eerything.
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ldx #0
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:loop lda _Sprites+SPRITE_STATUS,x
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:loop lda _Sprites+SPRITE_STATUS,x ; If the sttus is zero, that's the sentinel value
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beq :out
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; cmp #SPRITE_STATUS_DIRTY
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; beq :render
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bra :render
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ora forceSpriteFlag
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bit #SPRITE_STATUS_DIRTY ; If the dirty flag is set, do the things....
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bne :render
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:next inx
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inx
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bra :loop
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@ -46,194 +70,216 @@ _RenderSprites
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; from.
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:render
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stx tmp0 ; stash the X register
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txy ; switch to the Y register
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txy
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ldx _Sprites+OLD_VBUFF_ADDR,y
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jsr _EraseTileSprite ; erase from the old position
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; ldx _Sprites+OLD_VBUFF_ADDR,y
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; jsr _EraseTileSprite ; erase from the old position
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ldx _Sprites+VBUFF_ADDR,y
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lda _Sprites+TILE_DATA_OFFSET,y
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; Draw the sprite into the sprint plane buffer(s)
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ldx _Sprites+VBUFF_ADDR,y ; Get the address in the sprite plane to draw at
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lda _Sprites+TILE_DATA_OFFSET,y ; and the tile address of the tile
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tay
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jsr _DrawTileSprite ; draw the sprite into the sprite plane
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ldx tmp0
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ldy #0 ; flags to mark if the sprite is aligned to the code field grid or not
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; Mark the appropriate tiles as dirty and as occupied by a sprite so that the ApplyTiles
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; subroutine will get the drawn data from the sprite plane into the code field where it
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; can be drawn to the screen
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lda _Sprites+SPRITE_X,x ; Will need some special handling for X < 0
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sta tmp3
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ldx tmp0 ; Restore the index into the sprite array
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jsr _MarkDirtySprite8x8 ; Eventually will have routines for all sprite sizes
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bra :next
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; Marks a 8x8 square as dirty. The work here is mapping from local screen coordinates to the
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; tile store indices. The first step is to adjust the sprite coordinates based on the current
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; code field offsets and then cache variations of this value needed in the rest of the subroutine
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;
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; The SpritX is always the MAXIMUM value of the corner coordinates. We subtract (SpriteX + StartX) mod 4
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; to find the coordinate in the sprite plane that match up with the tile in the play field and
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; then use that to calculate the VBUFF address to copy sprite data from.
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;
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; StartX SpriteX z = * mod 4 (SprietX - z)
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; ----------------------------------------------
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; 0 8 0 8
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; 1 8 1 7
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; 2 8 2 6
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; 3 8 3 5
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; 4 9 1 8
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; 5 9 2 7
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; 6 9 3 6
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; 7 9 0 9
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; 8 10 2 8
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; ...
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;
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; For the Y-coordinate, we just use "mod 8" instead of "mod 4"
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_MarkDirtySprite8x8
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; First, bounds check the X and Y coodinates of the sprite and, if they pass, pre-calculate some
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; values that we can use later
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lda _Sprites+SPRITE_Y,x ; This is a signed value
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bpl :y_is_pos
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cmp #$FFF9 ; If a tile is <= -8 do nothing, it's off-screen
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bcs :y_is_ok
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rts
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:y_is_pos cmp ScreenHeight ; Is a tile is > ScreenHeight, it's off-screen
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bcc :y_is_ok
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rts
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:y_is_ok
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; The sprite's Y coordinate is in a range that it will impact the visible tiles that make up the play
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; field. Figure out what tile(s) they are and what part fo the sprite plane data/mask need to be
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; accessed to overlay with the tile pixels
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clc
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adc StartYMod208 ; Adjust for the scroll offset (could be a negative number!)
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tay ; Save this value
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and #$0007 ; Get (StartY + SpriteY) mod 8. For negative, this is ok because 65536 mod 8 = 0.
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sta tmp6
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eor #$FFFF
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inc
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clc
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adc _Sprites+SPRITE_Y,x ; subtract from the SpriteY position
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sta tmp1 ; This position will line up with the tile that the sprite overlaps with
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tya ; Get back the position of the sprite in the code field
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bpl :ty_is_pos
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clc
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adc #208 ; wrap around if we are slightly off-screen
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bra :ty_is_ok
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:ty_is_pos cmp #208 ; check if we went too far positive
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bcc :ty_is_ok
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sbc #208
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:ty_is_ok
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lsr
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lsr
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lsr ; This is the row in the Tile Store for top-left corner of the sprite
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sta tmp2
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; Same code, except for the X coordiante
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lda _Sprites+SPRITE_X,x
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bpl :x_is_pos
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cmp #$FFFD ; If a tile is <= -4 do nothing, it's off-screen
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bcs :x_is_ok
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rts
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:x_is_pos cmp ScreenWidth ; Is a tile is > ScreeWidth, it's off-screen
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bcc :x_is_ok
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rts
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:x_is_ok
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clc
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adc StartXMod164
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tay
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and #$0003
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sta tmp5 ; save the mod value to test for alignment later
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bit #$0003 ; If the botton bit are zero, then we're aligned
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beq :aligned_x
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ldy #4
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:aligned_x
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eor #$FFFF
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inc
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clc
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adc _Sprites+SPRITE_X,x
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sta tmp3
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cmp #164
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bcc *+5
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tya
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bpl :tx_is_pos
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clc
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adc #164
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bra :tx_is_ok
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:tx_is_pos cmp #164
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bcc :tx_is_ok
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sbc #164
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:tx_is_ok
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lsr
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lsr
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pha ; Save the tile column
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lda _Sprites+SPRITE_Y,x
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sta tmp2
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clc
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adc StartYMod208
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bit #$0007
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beq :aligned_y
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iny
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iny
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:aligned_y
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cmp #208
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bcc *+5
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sbc #208
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lsr
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lsr
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lsr
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tyx ; stash the alignment in the x register for dispatch
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jmp (:mark_dirty,x)
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; :mark_dirty dw :corner,:column,:row,:square
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:mark_dirty dw :corner,:corner,:corner,:corner
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; Just mark the square with the sprite as dirty
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:corner tay
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plx
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jsr _MarkAsDirty
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ldx tmp0
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brl :next
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; Mark the left column (x, y) and (x, y+1) as dirty
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:column tay
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plx
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jsr _MarkAsDirty
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iny
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cpy #26
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bcc *+5
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ldy #0
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lda tmp2
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clc
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adc #8
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sta tmp2
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jsr _MarkAsDirty
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ldx tmp0
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brl :next
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; Mark the top row (x, y) and (x+1, y) as dirty
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:row tay
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plx
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jsr _MarkAsDirty
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inx
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cpx #41
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bcc *+5
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ldx #0
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lda tmp3
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clc
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adc #4
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sta tmp3
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jsr _MarkAsDirty
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ldx tmp0
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brl :next
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; Mark all four squares as dirty
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:square tay
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lda 1,s
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tax
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jsr _MarkAsDirty
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inx
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cpx #41
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bcc *+5
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ldx #0
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lda tmp3
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clc
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adc #4
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sta tmp3
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jsr _MarkAsDirty
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iny
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cpy #26
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bcc *+5
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ldy #0
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lda tmp2
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clc
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adc #8
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sta tmp2
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jsr _MarkAsDirty
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plx
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lda tmp3
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sec
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sbc #4
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sta tmp3
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jsr _MarkAsDirty
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ldx tmp0
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brl :next
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_MarkAsDirty
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phx
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phy
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jsr _GetTileStoreOffset ; Get the tile store value
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jsr _PushDirtyTile ; Enqueue for processing (Returns offset in Y-register)
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lda TileStore+TS_SPRITE_FLAG,y ; If this tile has already been flagged on this frame, avoid recalculating the address
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beq :early_out
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lda #TILE_SPRITE_BIT ; Mark this tile as having a sprite, regardless of whether it was already enqueued
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sta TileStore+TS_SPRITE_FLAG,y
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jsr _SetSpriteAddr
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:early_out
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ply
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plx
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rts
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; Set the TileStore+TS_SPRITE_ADDR for tile that a sprite is on.
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;
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; To calculate the sprite plane coordinate for this tile column. We really just have to compensate
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; for the StartXMod164 mod 4 value, so the final value is (SPRITE_X + (StartXMod164 mod 4)) & 0xFFFC
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; for the horizontal and (SPRITE_Y + (StartYMod208 mod 8)) & 0xFFF8
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;
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; The final address is (Y + NUM_BUFF_LINES) * 256 + X
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;
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; tmp2 = sprite Y coordinate
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; tmp3 = sprite X coordinate
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; Y = tile record index
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_SetSpriteAddr
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lda StartYMod208
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and #$0007
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clc
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adc tmp2
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and #$00F8
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clc
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adc #NUM_BUFF_LINES
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xba
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sta tmp4
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lda StartXMod164
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and #$0003
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clc
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adc tmp3
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and #$00FC
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clc
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adc tmp4
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sta TileStore+TS_SPRITE_ADDR,y
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; At this point we have the top-left corner in the sprite plane (tmp1, tmp3) and the corresponding
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; column and row in the tile store (tmp2, tmp4). The next step is to add these tile locations to
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; the dirty queue and set the sprite flag along with the VBUFF location. We try to incrementally
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; calculate new values to avoid re-doing work.
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_SpriteVBuffAddr tmp3;tmp1
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pha
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_TileStoreOffset tmp4;tmp2
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tax
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lda #TILE_SPRITE_BIT
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sta TileStore+TS_SPRITE_FLAG,x
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pla
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sta TileStore+TS_SPRITE_ADDR,x
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txa
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jsr _PushDirtyTile
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; Now see if we need to extend to other tiles. If the mod values are not equal to zero, then
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; the width of the sprite will extend into the adjacent code field tiles.
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lda tmp5
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beq :no_x_oflow
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lda tmp3
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clc
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adc #4
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sta tmp7
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lda tmp4
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inc
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cmp #41
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bcc *+5
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lda #0
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sta tmp8
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_SpriteVBuffAddr tmp7;tmp1
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pha
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_TileStoreOffset tmp8;tmp2
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tax
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lda #TILE_SPRITE_BIT
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sta TileStore+TS_SPRITE_FLAG,x
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pla
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sta TileStore+TS_SPRITE_ADDR,x
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txa
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jsr _PushDirtyTile
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:no_x_oflow
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lda tmp6
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beq :no_y_oflow
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lda tmp1
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clc
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adc #8
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sta tmp1
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lda tmp2
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inc
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cmp #26
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bcc *+5
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lda #0
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sta tmp2
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_SpriteVBuffAddr tmp3;tmp1
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pha
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_TileStoreOffset tmp4;tmp2
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tax
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lda #TILE_SPRITE_BIT
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sta TileStore+TS_SPRITE_FLAG,x
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pla
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sta TileStore+TS_SPRITE_ADDR,x
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txa
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jsr _PushDirtyTile
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lda tmp5
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beq :no_y_oflow
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_SpriteVBuffAddr tmp7;tmp1
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pha
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_TileStoreOffset tmp8;tmp2
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tax
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lda #TILE_SPRITE_BIT
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sta TileStore+TS_SPRITE_FLAG,x
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pla
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sta TileStore+TS_SPRITE_ADDR,x
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txa
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jsr _PushDirtyTile
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:no_y_oflow
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ldx tmp0 ; Restore X register
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rts
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; _GetTileAt
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@ -453,18 +499,18 @@ _AddSprite
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:open lda #SPRITE_STATUS_DIRTY
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sta _Sprites+SPRITE_STATUS,x ; Mark this sprite slot as occupied and that it needs to be drawn
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pla
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jsr _GetTileAddr
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jsr _GetTileAddr ; This applies the TILE_ID_MASK
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sta _Sprites+TILE_DATA_OFFSET,x
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tya
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clc
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||||
adc #NUM_BUFF_LINES ; The virtual buffer has 24 lines of off-screen space
|
||||
xba ; Each virtual scan line is 256 bytes wide for overdraw space
|
||||
clc
|
||||
adc 1,s ; Add the horizontal position
|
||||
tya ; Y coordinate
|
||||
sta _Sprites+SPRITE_Y,x
|
||||
|
||||
pla ; X coordinate
|
||||
sta _Sprites+SPRITE_X,x
|
||||
|
||||
jsr _GetSpriteVBuffAddr ; Preserves X-register
|
||||
sta _Sprites+VBUFF_ADDR,x
|
||||
|
||||
pla ; Pop off the saved value
|
||||
clc ; Mark that the sprite was successfully added
|
||||
txa ; And return the sprite ID
|
||||
rts
|
||||
@ -472,15 +518,22 @@ _AddSprite
|
||||
; X = x coordinate
|
||||
; Y = y coordinate
|
||||
GetSpriteVBuffAddr ENT
|
||||
jsr _GetSpriteVBuffAddr
|
||||
rtl
|
||||
|
||||
; A = x coordinate
|
||||
; Y = y coordinate
|
||||
_GetSpriteVBuffAddr
|
||||
pha
|
||||
tya
|
||||
clc
|
||||
adc #NUM_BUFF_LINES ; The virtual buffer has 24 lines of off-screen space
|
||||
xba ; Each virtual scan line is 256 bytes wide for overdraw space
|
||||
phx
|
||||
clc
|
||||
adc 1,s
|
||||
plx
|
||||
rtl
|
||||
sta 1,s
|
||||
pla
|
||||
rts
|
||||
|
||||
; Move a sprite to a new location. If the tile ID of the sprite needs to be changed, then
|
||||
; a full remove/add cycle needs to happen
|
||||
@ -518,11 +571,8 @@ _UpdateSprite
|
||||
tya ; Update the Y coordinate
|
||||
sta _Sprites+SPRITE_Y,x
|
||||
|
||||
clc
|
||||
adc #NUM_BUFF_LINES ; The virtual buffer has 24 lines of off-screen space
|
||||
xba ; Each virtual scan line is 256 bytes wide for overdraw space
|
||||
clc
|
||||
adc tmp0 ; Add the horizontal position
|
||||
lda tmp0
|
||||
jsr _GetSpriteVBuffAddr
|
||||
sta _Sprites+VBUFF_ADDR,x
|
||||
|
||||
rts
|
||||
|
||||
@ -113,6 +113,8 @@ _RenderTile2
|
||||
lda TileStore+TS_TILE_ID,y ; build the finalized tile descriptor
|
||||
ora TileStore+TS_SPRITE_FLAG,y
|
||||
bpl :nosprite ; save a few cycles on average -- the sprite flag is $8000, so easy bpl/bmi test
|
||||
tyx
|
||||
stz TileStore+TS_SPRITE_FLAG,x ; clear the sprite flag
|
||||
ldx TileStore+TS_SPRITE_ADDR,y
|
||||
stx _SPR_X_REG
|
||||
|
||||
|
||||
@ -5,6 +5,7 @@
|
||||
; there is no way to do everything inline, so a composite tile is created on the fly and written to
|
||||
; a direct page buffer. This direct page buffer is then used to render the tile.
|
||||
_TBSolidSpriteTile_00
|
||||
ldx #45*128
|
||||
jsr _TBCopyTileDataToCBuff ; Copy the tile into the compositing buffer (using correct x-register)
|
||||
jsr _TBApplySpriteData ; Overlay the data form the sprite plane (and copy into the code field)
|
||||
jmp _TBFillPEAOpcode ; Fill in the code field opcodes
|
||||
|
||||
Loading…
Reference in New Issue
Block a user