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https://github.com/lscharen/iigs-game-engine.git
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Get minimal tiles and sprites rendering without a crash
This commit is contained in:
Lucas Scharenbroich
parent
1f9c9b3f5b
commit
4ea3033b5e
85
src/Tiles.s
85
src/Tiles.s
@ -114,8 +114,9 @@ InitTiles
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bra :out
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:fast
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lda #0 ; Initialize with Tile 0
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ldy #FastOverZA
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ldy #FastProcs
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jsr _SetTileProcs
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bra :out
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:dyn lda #0 ; Initialize with Tile 0
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ldy #DynOverZA
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@ -209,25 +210,26 @@ _SetTile
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; Calculate the base tile proc selector from the tile Id
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stz procIdx
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lda newTileId
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clc
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bit #TILE_PRIORITY_BIT
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lda #TILE_PRIORITY_BIT
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bit newTileId
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beq :low_priority
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sec
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:low_priority asl procIdx
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lda #4
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sta procIdx
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:low_priority
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clc
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bit #TILE_ID_MASK
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lda #TILE_ID_MASK
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bit newTileId
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bne :not_zero
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sec
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:not_zero asl procIdx
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lda #2
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tsb procIdx
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:not_zero
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clc
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bit #TILE_VFLIP_BIT
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lda #TILE_VFLIP_BIT
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beq :no_vflip
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sec
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:no_vflip asl procIdx
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lda #1
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tsb procIdx
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:no_vflip
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; Multiple by 6 to get the correct table entry index
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@ -235,7 +237,7 @@ _SetTile
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lda procIdx
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asl
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adc procIdx
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tay
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sta procIdx
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; Now integrate with the engine mode indicator
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@ -270,7 +272,7 @@ _SetTile
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; Specialized check for when the engine is in "Fast" mode. If is a simple decision tree based on whether
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; the tile priority bit is set, and whether this is the special tile 0 or not.
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:setTileFast
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lda #FastProcs
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ldy #FastProcs
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lda procIdx
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jsr _SetTileProcs
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jmp _PushDirtyTileX
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@ -280,21 +282,18 @@ _SetTile
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; are both Dynamic tiles or both Basic tiles, then we can use an optimized routine. Otherwise
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; we must set the opcodes as well as the operands
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:setTileDyn
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lda #DynProcs
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brk $55
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ldy #DynProcs
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lda procIdx
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jsr _SetTileProcs
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jmp _PushDirtyTileX
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:out
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jmp _PushDirtyTileY ; on the next call to _ApplyTiles
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; X = Tile Store offset
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; Y = Engine Mode Base Table address
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; A = Table proc index
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;
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; see TileProcTables in static/TileStore.s
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bnkPtr equ blttmp
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tblPtr equ blttmp+4
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tblPtr equ blttmp
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_SetTileProcs
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; Set a long pointer to this bank
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@ -447,6 +446,7 @@ last_bit lda (SPRITE_VBUFF_PTR+{]1*2}),y
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clc ; pre-adjust these later
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adc _Sprites+TS_VBUFF_BASE+{]1*2}
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sta sprite_ptr0+{]2*4}
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tyx
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jmp (K_TS_ONE_SPRITE,x)
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next_bit
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<<<
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@ -472,6 +472,15 @@ endbit mac
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jmp ]3
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<<<
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endbit1 mac
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lda (SPRITE_VBUFF_PTR+{]1*2}),y
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clc ; pre-adjust these later
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adc _Sprites+TS_VBUFF_BASE+{]1*2}
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sta sprite_ptr0+{]2*4}
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tyx
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jmp (K_TS_ONE_SPRITE,x)
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<<<
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; OPTIMIZATION:
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;
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; bit #$00FF ; Optimization to skip the first 8 bits if they are all zeros
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@ -499,22 +508,22 @@ endbit mac
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; ]4 address of four sprite process
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SpriteBitsToVBuffAddrs mac
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dobit1 0;0;b_1_1;]1
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dobit1 1;0;b_2_1;]1
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dobit1 2;0;b_3_1;]1
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dobit1 3;0;b_4_1;]1
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dobit1 4;0;b_5_1;]1
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dobit1 5;0;b_6_1;]1
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dobit1 6;0;b_7_1;]1
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dobit1 7;0;b_8_1;]1
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dobit1 8;0;b_9_1;]1
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dobit1 9;0;b_10_1;]1
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dobit1 10;0;b_11_1;]1
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dobit1 11;0;b_12_1;]1
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dobit1 12;0;b_13_1;]1
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dobit1 13;0;b_14_1;]1
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dobit1 14;0;b_15_1;]1
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endbit 15;0;]1
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dobit1 0;0;b_1_1
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dobit1 1;0;b_2_1
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dobit1 2;0;b_3_1
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dobit1 3;0;b_4_1
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dobit1 4;0;b_5_1
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dobit1 5;0;b_6_1
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dobit1 6;0;b_7_1
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dobit1 7;0;b_8_1
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dobit1 8;0;b_9_1
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dobit1 9;0;b_10_1
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dobit1 10;0;b_11_1
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dobit1 11;0;b_12_1
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dobit1 12;0;b_13_1
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dobit1 13;0;b_14_1
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dobit1 14;0;b_15_1
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endbit1 15;0
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b_1_1 dobit 1;1;b_2_2;]2
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b_2_1 dobit 2;1;b_3_2;]2
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@ -368,7 +368,6 @@ _TSGetSeconds
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put render/Sprite1.s
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put render/Sprite2.s
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put tiles/DirtyTileQueue.s
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; put tiles/FastRenderer.s
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put blitter/Horz.s
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put blitter/Vert.s
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put blitter/BG0.s
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@ -85,7 +85,7 @@ _TBCopyTileMaskToCBuffV
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;
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; A specialized routine that fills in a tile with a single constant value. It's intended to be used to
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; fill in solid colors, so there are no specialized horizontal or verical flipped variantsConstUnderZero
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_TBConstTile0 tax
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_TBConstTile0
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_TBConstTileX
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lda #0
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sta: $0001,y
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