Apple-2gs-SW/iigs-game-engine
1
0
Fork 0
mirror of https://github.com/lscharen/iigs-game-engine.git synced 2025-02-06 06:29:57 +00:00
Code Issues Projects Releases Wiki Activity

Continuing to tweak and debug

Browse Source
This commit is contained in:
Lucas Scharenbroich 2022-05-31 16:31:44 -05:00
parent bba8929db7
commit 98adfe5daa
4 changed files with 276 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/Sprite.s
View File

@ -38,7 +38,7 @@ InitSprites
adc #4*2 ; skip ahead 4 tiles
inx
inx
cpx #8*2
cpx #16*2
bcc :loop4
; Precalculate some bank values
@ -153,7 +153,7 @@ _DoPhase1
jmp _ClearSpriteFromTileStore ; Clear the tile flags, add to the dirty tile list and done
; Need to calculate new VBUFF information. The could be reuqired for UPDATED, ADDED or MOVED
; Need to calculate new VBUFF information. The could be required for UPDATED, ADDED or MOVED
; sprites, so we do it unconditionally.
:no_clear
jsr _CalcDirtySprite
@ -648,6 +648,7 @@ _PrecalcAllSpriteInfo
sbc _Sprites+SPRITE_CLIP_TOP,x
inc
sta _Sprites+SPRITE_CLIP_HEIGHT,x
rts
:offscreen
@ -691,14 +692,19 @@ _UpdateSprite
tax
pla
cmp _Sprites+SPRITE_ID,x ; If the flags changed, need to redraw the sprite
bne :sprite_flag_change ; on the next frame
; Do some work to see if only the H or V bits have changed. If so, merge them into the
; SPRITE_ID
eor _Sprites+SPRITE_ID,x ; If either bit has changed, this will be non-zero
and #SPRITE_VFLIP+SPRITE_HFLIP
bne :sprite_flag_change
tya
cmp _Sprites+VBUFF_ADDR,x ; Did the stamp change?
bne :sprite_stamp_change
rts ; Nothing changed, so just return
:sprite_flag_change
eor _Sprites+SPRITE_ID,x ; put the new bits into the value. ---HV--- ^ SPRITE_ID & 00011000 ^ SPRITE_ID = SSSHVSSS
sta _Sprites+SPRITE_ID,x ; Keep a copy of the full descriptor
tya
:sprite_stamp_change

72
src/Sprite2.s
View File

@ -61,15 +61,18 @@ _CalcDirtySprite
sta _Sprites+OLD_TS_LOOKUP_INDEX,y
; Add the first visible row of the sprite to the Y-scroll offset to find the first line in the
; code field that needs to be drawn. The range of values is 0 to 199+207 = [0, 406]
; code field that needs to be drawn. The range of values is 0 to 199+207 = [0, 406]. This
; value is dividede by 8, so the range of lookup values is [0, 50], so 51 possible values.
clc
lda _Sprites+SPRITE_CLIP_TOP,y
adc StartYMod208 ; Adjust for the scroll offset
tax ; Cache
pha ; Cache
and #$FFF8 ; mask first to ensure LSR will clear the carry
lsr
lsr
tax
lda TileStoreLookupYTable,x
sta RowTop ; Even numbers from [0, 100] (50 elements)
; Get the position of the top edge within the tile and then add it to the sprite's height
@ -78,7 +81,7 @@ _CalcDirtySprite
; that are intersected, rather than assuming an 8x8 sprite always takes up that amount of
; space.
txa
pla
and #$0007
tax ; cache again. This is a bit faster than recalculating
@ -94,7 +97,8 @@ _CalcDirtySprite
sta tmp0
; Add the horizontal position to the horizontal offset to find the first column in the
; code field that needs to be drawn. The range of values is 0 to 159+163 = [0, 322]
; code field that needs to be drawn. The range of values is 0 to 159+163 = [0, 322].
; This value is divided by 4, so 81 possible values
clc
lda _Sprites+SPRITE_CLIP_LEFT,y
@ -201,8 +205,8 @@ TSSetSprite mac
next
<<<
ROW equ TILE_STORE_WIDTH*2
COL equ TILE_DATA_SPAN
ROW equ TILE_STORE_WIDTH*2 ; This many bytes to the next row in TileStore coordinates
COL equ 2 ; This many bytes for each element
:mark1x1
ldx _Sprites+VBUFF_ARRAY_ADDR,y ; get the address of this sprite's vbuff values
@ -264,10 +268,10 @@ COL equ TILE_DATA_SPAN
sta: {1*ROW}+{1*COL},x
ldx _Sprites+TS_LOOKUP_INDEX,y
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0;#{0*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2;#{0*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0;#{1*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2;#{1*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2
rts
:mark2x3
@ -286,12 +290,12 @@ COL equ TILE_DATA_SPAN
sta: {1*ROW}+{2*COL},x
ldx _Sprites+TS_LOOKUP_INDEX,y
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0;#{0*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2;#{0*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+4;#{0*VBUFF_TILE_ROW_BYTES}+{2*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0;#{1*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2;#{1*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+4;#{1*VBUFF_TILE_ROW_BYTES}+{2*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+4
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+4
rts
:mark3x1
@ -304,9 +308,9 @@ COL equ TILE_DATA_SPAN
sta: {2*ROW}+{0*COL},x
ldx _Sprites+TS_LOOKUP_INDEX,y
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0;#{0*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0;#{1*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+0;#{2*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+0
rts
:mark3x2
@ -325,12 +329,12 @@ COL equ TILE_DATA_SPAN
sta: {2*ROW}+{1*COL},x
ldx _Sprites+TS_LOOKUP_INDEX,y
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0;#{0*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2;#{0*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0;#{1*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2;#{1*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+0;#{2*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+2;#{2*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+2
rts
:mark3x3
@ -355,13 +359,13 @@ COL equ TILE_DATA_SPAN
sta: {2*ROW}+{2*COL},x
ldx _Sprites+TS_LOOKUP_INDEX,y
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0;#{0*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2;#{0*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+4;#{0*VBUFF_TILE_ROW_BYTES}+{2*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0;#{1*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2;#{1*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+4;#{1*VBUFF_TILE_ROW_BYTES}+{2*VBUFF_TILE_COL_BYTES}
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+0;#{2*VBUFF_TILE_ROW_BYTES}+{0*VBUFF_TILE_COL_BYTES}
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+2;#{2*VBUFF_TILE_ROW_BYTES}+{1*VBUFF_TILE_COL_BYTES}
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+4;#{2*VBUFF_TILE_ROW_BYTES}+{2*VBUFF_TILE_COL_BYTES}
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 0*{TS_LOOKUP_SPAN*2}+4
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 1*{TS_LOOKUP_SPAN*2}+4
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+0
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+2
TSSetSprite 2*{TS_LOOKUP_SPAN*2}+4
rts

226
src/SpriteV1.s Normal file
View File

@ -0,0 +1,226 @@
; Old code the was in Version 1, but is not needed. May be adapted for Verions 2.
; Y = _Sprites array offset
_EraseSpriteY
lda _Sprites+OLD_VBUFF_ADDR,y
beq :noerase
ldx _Sprites+SPRITE_DISP,y ; get the dispatch index for this sprite (32 values)
jmp (:do_erase,x)
:noerase rts
:do_erase dw _EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8
dw _EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16
dw _EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8
dw _EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16
dw _EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8,_EraseTileSprite8x8
dw _EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16,_EraseTileSprite8x16
dw _EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8,_EraseTileSprite16x8
dw _EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16,_EraseTileSprite16x16
; A = bank address
_EraseTileSprite8x8
tax
phb ; Save the bank to switch to the sprite plane
pei SpriteBanks
plb ; pop the data bank (low byte)
]line equ 0
lup 8
stz: {]line*SPRITE_PLANE_SPAN}+0,x
stz: {]line*SPRITE_PLANE_SPAN}+2,x
]line equ ]line+1
--^
plb ; pop the mask bank (high byte)
lda #$FFFF
]line equ 0
lup 8
sta: {]line*SPRITE_PLANE_SPAN}+0,x
sta: {]line*SPRITE_PLANE_SPAN}+2,x
]line equ ]line+1
--^
plb
rts
_EraseTileSprite8x16
tax
phb ; Save the bank to switch to the sprite plane
pei SpriteBanks
plb ; pop the data bank (low byte)
]line equ 0
lup 16
stz: {]line*SPRITE_PLANE_SPAN}+0,x
stz: {]line*SPRITE_PLANE_SPAN}+2,x
]line equ ]line+1
--^
plb ; pop the mask bank (high byte)
lda #$FFFF
]line equ 0
lup 16
sta: {]line*SPRITE_PLANE_SPAN}+0,x
sta: {]line*SPRITE_PLANE_SPAN}+2,x
]line equ ]line+1
--^
plb
rts
_EraseTileSprite16x8
tax
phb ; Save the bank to switch to the sprite plane
pei SpriteBanks
plb ; pop the data bank (low byte)
]line equ 0
lup 8
stz: {]line*SPRITE_PLANE_SPAN}+0,x
stz: {]line*SPRITE_PLANE_SPAN}+2,x
stz: {]line*SPRITE_PLANE_SPAN}+4,x
stz: {]line*SPRITE_PLANE_SPAN}+6,x
]line equ ]line+1
--^
plb ; pop the mask bank (high byte)
lda #$FFFF
]line equ 0
lup 8
sta: {]line*SPRITE_PLANE_SPAN}+0,x
sta: {]line*SPRITE_PLANE_SPAN}+2,x
sta: {]line*SPRITE_PLANE_SPAN}+4,x
sta: {]line*SPRITE_PLANE_SPAN}+6,x
]line equ ]line+1
--^
plb
rts
_EraseTileSprite16x16
tax
phb ; Save the bank to switch to the sprite plane
pei SpriteBanks
plb ; pop the data bank (low byte)
]line equ 0
lup 16
stz: {]line*SPRITE_PLANE_SPAN}+0,x
stz: {]line*SPRITE_PLANE_SPAN}+2,x
stz: {]line*SPRITE_PLANE_SPAN}+4,x
stz: {]line*SPRITE_PLANE_SPAN}+6,x
]line equ ]line+1
--^
plb ; pop the mask bank (high byte)
lda #$FFFF
]line equ 0
lup 16
sta: {]line*SPRITE_PLANE_SPAN}+0,x
sta: {]line*SPRITE_PLANE_SPAN}+2,x
sta: {]line*SPRITE_PLANE_SPAN}+4,x
sta: {]line*SPRITE_PLANE_SPAN}+6,x
]line equ ]line+1
--^
plb
rts
; First, if there is only one sprite, then we can skip any overhead and do a single lda/and/ora/sta to put the
; sprite data on the screen.
;
; Second, if there are 4 or less, then we "stack" the sprite data using an unrolled loop that allows each
; sprite to just be a single and/ora pair and the final result is not written to any intermediate memory buffer.
;
; Third, if there are 5 or more sprites, then we assume that the sprites are "dense" and that there will be a
; non-trivial amount of overdraw. In this case we do a series of optimized copies of the sprite data *and*
; masks into a direct page buffer in *reverse order*. Once a mask value becomes zero, then nothing else can
; show through and that value can be skipped. Once all of the mask values are zero, then the render is terminated
; and the data buffer copied to the final destination.
;
; Note that these rendering algorithms impose a priority ordering on the sprites where lower sprite IDs are drawn
; underneath higher sprite IDs.
RenderActiveSpriteTiles
cmp #0 ; Is there only one active sprite? If so optimise
bne :many
ldx vbuff ; load the address to the (adjusted) sprite tile
lda TileStore+TS_SCREEN_ADDR,y
tay
lda tiledata+0,y
andl spritemask,x
oral spritedata,x
sta 00,s
lda tiledata+2,y
andl spritemask+2,x
oral spritedata+2,x
sta 02,s
...
tsc
adc #320
tcs
...
lda tiledata+{line*4},y
andl spritemask+{line*SPAN},x
oral spritedata+{line*SPAN},x
sta 160,s
lda tiledata+{line*4}+2,y
andl spritemask+{line*SPAN}+2,x
oral spritedata+{line*SPAN}+2,x
sta 162,s
rts
:many
lda TileStore+TS_SCREEN_ADDR,y
tcs
lda TileStore+TS_TILE_ADDR,y
tay
ldx count
jmp (:arr,x)
lda tiledata+0,y
ldx vbuff
andl spritemask,x
oral spritedata,x
ldx vbuff+2
andl spritemask,x
oral spritedata,x
ldx vbuff+4
andl spritemask,x
oral spritedata,x
...
sta 00,s
ldx count
jmp (:arr,x)
lda tiledata+0,y
ldx vbuff
andl spritemask,x
oral spritedata,x
ldx vbuff+2
andl spritemask,x
oral spritedata,x
ldx vbuff+4
andl spritemask,x
oral spritedata,x
...
sta 02,s
sta 160,s
sta 162,s
tsc
adc #320

7
src/tiles/FastRenderer.s
View File

@ -58,20 +58,17 @@ OneSpriteFast
plb
; jmp _TBApplySpriteData2
_TBApplySpriteData2
]line equ 0
lup 8
lda blttmp+{]line*4}
lda tmp_tile_data+{]line*4}
andl spritemask+{]line*SPRITE_PLANE_SPAN},x
oral spritedata+{]line*SPRITE_PLANE_SPAN},x
; lda #$FFFF
sta: $0004+{]line*$1000},y
lda blttmp+{]line*4}+2
lda tmp_tile_data+{]line*4}+2
andl spritemask+{]line*SPRITE_PLANE_SPAN}+2,x
oral spritedata+{]line*SPRITE_PLANE_SPAN}+2,x
; lda #$FFFF
sta: $0001+{]line*$1000},y
]line equ ]line+1
--^