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https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-26 07:49:17 +00:00
Continued bug fixing
* Missed an XBA to swap tile command bits into a proper index range * Explicitly track the BASE_ADDR * Fix some register overwriting * Add an UpdateSprite method
This commit is contained in:
Lucas Scharenbroich
parent
160606bcc4
commit
3b8bf652e1
@ -46,6 +46,9 @@ EngineStartUp ENT
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jsr EngineReset ; All of the resources are allocated, put the engine in a known state
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jsr InitGraphics ; Initialize all of the graphics-related data
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jsr InitSprites ; Initialize the sprite subsystem
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jsr InitTiles ; Initialize the tile subsystem
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jsr InitTimers ; Initialize the timer subsystem
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plb
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@ -252,7 +255,6 @@ EngineReset
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]step equ ]step+4
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--^
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jsr _InitDirtyTiles
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rts
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; Allow the user to dynamically select one of the pre-configured screen sizes, or pass
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@ -38,6 +38,7 @@ StopScript EXT
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; Sprite functions
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AddSprite EXT
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UpdateSprite EXT
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; Direct access to internals
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DoScriptSeq EXT
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67
src/Sprite.s
67
src/Sprite.s
@ -6,20 +6,20 @@
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; wider and taller than the physical graphics screen.
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;
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; Initialize the sprite plane data and mask banks (all data = $0000, all masks = $FFFF)
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_InitSprite
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InitSprites
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ldx #$FFFE
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lda #0
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:loop stal spritedata,x
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:loop1 stal spritedata,x
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dex
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dex
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bpl :loop
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bpl :loop1
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ldx #$FFFE
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lda #$FFFF
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:loop stal spritemask,x
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:loop2 stal spritemask,x
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dex
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dex
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bpl :loop
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bpl :loop2
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rts
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@ -40,7 +40,8 @@ _RenderSprites
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; This is the complicated part; we need to draw the sprite into the sprite place, but then
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; calculate the code field tiles that this sprite potentially overlaps with and mark those
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; tiles as dirty.
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:render
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:render
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phx ; stash the X register
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jsr _DrawTileSprite ; draw the sprite into the sprite plane
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stz tmp0 ; flags to mark if the sprite is aligned to the code field grid or not
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@ -59,7 +60,7 @@ _RenderSprites
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sbc #164
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lsr
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lsr
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pha ; Save the tile
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pha ; Save the tile column
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lda _Sprites+SPRITE_Y,x
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clc
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@ -81,10 +82,14 @@ _RenderSprites
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tay
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plx
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jsr _GetTileStoreOffset ; Get the tile store value
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jsr _PushDirtyTile ; Enqueue for processing
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jsr _PushDirtyTile ; Enqueue for processing (Returns offset in Y-register)
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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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; TODO: Mark adjacent tiles as dirty based on tmp0 and tmp1 values
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plx ; Restore the X register
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brl :next
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; _GetTileAt
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@ -258,7 +263,7 @@ AddSprite ENT
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rtl
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_AddSprite
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phx ; Save the parameters
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phx ; Save the horizontal position and tile ID
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pha
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ldx #0
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@ -271,6 +276,7 @@ _AddSprite
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pla ; Early out
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pla
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sec ; Signal that no sprite slot was available
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rts
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:open lda #SPRITE_STATUS_DIRTY
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@ -284,10 +290,49 @@ _AddSprite
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adc #NUM_BUFF_LINES ; The virtual buffer has 24 lines of off-screen space
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xba ; Each virtual scan line is 256 bytes wide for overdraw space
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clc
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adc 1,s
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adc 1,s ; Add the horizontal position
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sta _Sprites+VBUFF_ADDR,x
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pla
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pla ; Pop off the saved value
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clc ; Mark that the sprite was successfully added
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txa ; And return the sprite ID
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rts
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; Move a sprite to a new location. If the tile ID of the sprite needs to be changed, then
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; a full remove/add cycle needs to happen
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;
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; A = sprite ID
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; X = x position
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; Y = y position
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UpdateSprite ENT
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phb
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phk
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plb
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jsr _UpdateSprite
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plb
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rtl
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_UpdateSprite
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cmp #MAX_SPRITES*2 ; Make sure we're in bounds
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bcc :ok
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rts
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:ok
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phx ; Save the horizontal position
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tax ; Get the sprite index
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lda #SPRITE_STATUS_DIRTY ; Position is changing, mark as 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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tya
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clc
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adc #NUM_BUFF_LINES ; The virtual buffer has 24 lines of off-screen space
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xba ; Each virtual scan line is 256 bytes wide for overdraw space
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clc
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adc 1,s ; Add the horizontal position
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sta _Sprites+VBUFF_ADDR,x
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pla ; Pop off the saved value
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rts
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; Sprite data structures. We cache quite a few pieces of information about the sprite
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@ -112,6 +112,7 @@ _RenderTile2
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lda TileStore+TS_TILE_ID,y ; build the finalized tile descriptor
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ora TileStore+TS_SPRITE_FLAG,y
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and #TILE_CTRL_MASK
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xba
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tax
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lda TileProcs,x ; load and patch in the appropriate subroutine
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sta :tiledisp+1
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@ -123,10 +124,12 @@ _RenderTile2
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pha
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rep #$20
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lda TileStore+TS_CODE_ADDR_LOW,y ; load the address of the code field
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pha
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lda TileStore+TS_BASE_ADDR,y ; load the address of the code field
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sta _BASE_ADDR
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lda TileStore+TS_WORD_OFFSET,y
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ldy _BASE_ADDR
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ply
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plb ; set the bank
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; B is set to the correct code field bank
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@ -495,11 +498,26 @@ DirtyTiles ds TILE_STORE_SIZE ; At most this many tiles can possibly
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; Initialize the tile storage data structures. This takes care of populating the tile records with the
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; appropriate constant values.
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_InitDirtyTiles
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InitTiles
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:col equ tmp0
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:row equ tmp1
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ldx #TILE_STORE_SIZE-2 ; Initialize the tile backing store with zeros
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; Fill in the TileStoreYTable. This is just a table of offsets into the Tile Store for each row. There
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; are 26 rows with a stride of 41
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ldy #0
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lda #0
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:yloop
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sta TileStoreYTable,y
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clc
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adc #41*2
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iny
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iny
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cpy #26*2
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bcc :yloop
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; Next, initialize the Tile Store itself
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ldx #TILE_STORE_SIZE-2
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lda #25
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sta :row
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lda #40
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@ -593,12 +611,13 @@ _SetTile
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jsr _GetTileStoreOffset0
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tay
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pla
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cmp TileStore+TS_TILE_ID,y
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beq :nochange
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sta TileStore+TS_TILE_ID,y
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tya
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jmp _PushDirtyTile
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; tya
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; jmp _PushDirtyTile
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:nochange rts
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@ -606,10 +625,8 @@ _SetTile
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; Append a new dirty tile record
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;
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; A = result of _GetTileStoreOffset for X, Y
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; X = tile column [0, 40] (41 columns)
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; Y = tile row [0, 25] (26 rows)
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;
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; The main purposed of this function is to
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; The main purpose of this function is to
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;
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; 1. Avoid marking the same tile dirty multiple times, and
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; 2. Pre-calculating all of the information necessary to render the tile
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@ -623,7 +640,7 @@ _PushDirtyTile
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; record fields.
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ldx DirtyTileCount
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txa
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sta TileStore+TS_DIRTY,y ; Store a back-link to this record
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@ -661,7 +678,7 @@ _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
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; Retrieve the offset of the next dirty Tile Store items in the Y-register
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jsr _PopDirtyTile2
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