mirror of
https://github.com/lscharen/iigs-game-engine.git
synced 2024-11-21 20:30:50 +00:00
Update dynamic tile rendered to use fixed snippets. Add DAMAGES flag for the one render that doesn't fit the mold
This commit is contained in:
Lucas Scharenbroich
parent
dd9ced08f1
commit
6832c7f405
@ -216,16 +216,16 @@ PAD_BUTTON_A equ $0200
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PAD_KEY_DOWN equ $0400
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; Tile constants
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; TILE_RESERVED_BIT equ $8000
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TILE_PRIORITY_BIT equ $4000 ; Put tile on top of sprite
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TILE_DAMAGED_BIT equ $8000 ; Mark a tile as damaged (internal only)
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TILE_PRIORITY_BIT equ $4000 ; Put tile on top of sprite (unimplemented)
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TILE_FRINGE_BIT equ $2000 ; Unused
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TILE_SOLID_BIT equ $1000 ; Hint bit used in TWO_LAYER_MODE to optimize rendering
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TILE_DYN_BIT equ $0800 ; Is this a Dynamic Tile?
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TILE_VFLIP_BIT equ $0400
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TILE_HFLIP_BIT equ $0200
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TILE_ID_MASK equ $01FF
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TILE_CTRL_MASK equ $FE00
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; TILE_PROC_MASK equ $F800 ; Select tile proc for rendering
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TILE_CTRL_MASK equ $7E00
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; TILE_PROC_MASK equ $7800 ; Select tile proc for rendering
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; Sprite constants
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SPRITE_COMPILED equ $4000 ; This is a compiled sprite (SPRITE_DISP points to a routine in the compiled cache bank)
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@ -29,7 +29,8 @@ SNIPPET_BASE equ snippets-base
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SNIPPET_ENTRY_1 equ 0 ; two layer + dynamic tile + sprite
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SNIPPET_ENTRY_2 equ 4 ; (two layer | dynamic tile) + sprite
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SNIPPET_ENTRY_3 equ 18 ; two layer + dynamic tile (no sprite)
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SNIPPET_ENTRY_3 equ 18 ; sprite under dynamic tile
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SNIPPET_ENTRY_4 equ 19 ; two layer + dynamic tile (no sprite)
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; Locations that need the page offset added
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PagePatches da {long_0-base+2}
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@ -51,7 +52,7 @@ PagePatches da {long_0-base+2}
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]index equ 0
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lup 82 ; Patch anything that needs updating within the snippets
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da {snippets-base+{]index*32}+17}
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da {snippets-base+{]index*32}+28}
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da {snippets-base+{]index*32}+29}
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]index equ ]index+1
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--^
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PagePatchNum equ *-PagePatches
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@ -296,7 +297,8 @@ epilogue_1 tsc
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; bcs _alt
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; _16bit pha
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; jmp NEXT
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; lda (00),y <--- Entry Point 3 (sneak this in here to avoid extra branch)
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; db 1 <--- Entry Point 3 (opcode for an LDA #DATA instruction)
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; lda (00),y <--- Entry Point 4 (sneak this in here to avoid extra branch)
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; and $80,x
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; ora $00,x
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; bcc _16bit
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@ -319,12 +321,13 @@ snippets lup 82
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bcs :byte ; 12: if C = 0, just push the data and return
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:word pha ; 14:
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jmp loop+3+{3*]index}-base ; 15: Return address offset within the code field
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lda ({{81-]index}*2}),y ; 18: Pre-set the LDA (XX),y instructions
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and $80,x ; 20:
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ora $00,x ; 22:
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bcc :word ; 24:
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:byte jmp jmp_rtn-base ; 26:
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ds 3 ; 29: Padding to make a full 32 bytes
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db $A9 ; 18: LDA #DATA opcode
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lda ({{81-]index}*2}),y ; 19: Pre-set the LDA (XX),y instructions
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and $80,x ; 21:
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ora $00,x ; 23:
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bcc :word ; 25:
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:byte jmp jmp_rtn-base ; 27:
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ds 2 ; 30: Padding to make a full 32 bytes
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]index equ ]index+1
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--^
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top
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@ -45,13 +45,14 @@ CopyDynamicTile
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; populating the code field and snippet space
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DynamicOver
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lda TileStore+TS_JMP_ADDR,x ; Get the address of the exception handler
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ora #SNIPPET_ENTRY_2
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sta _JTBL_CACHE
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lda TileStore+TS_TILE_ID,x ; Get the original tile descriptor
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and #$007F ; clamp to < (32 * 4)
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and #$007F ; clamp to < (32 * 4)
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ora #$B500
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xba
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sta _OP_CACHE ; This is the 2-byte opcode for to load the data
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sta _OP_CACHE ; This is the 2-byte opcode for to load the data
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lda TileStore+TS_CODE_ADDR_HIGH,x
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pha
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@ -91,6 +92,7 @@ DynamicOver
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DynamicUnder
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lda TileStore+TS_JMP_ADDR,x ; Get the address of the exception handler
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ora #SNIPPET_ENTRY_3
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sta _JTBL_CACHE
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lda TileStore+TS_TILE_ID,x ; Get the original tile descriptor
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@ -164,6 +166,7 @@ _DynFillJmpOpcode
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CopyDynamicTileTwoLyr
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ldal TileStore+TS_JMP_ADDR,x ; Get the address of the exception handler
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ora #SNIPPET_ENTRY_4
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sta _JTBL_CACHE
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ldal TileStore+TS_WORD_OFFSET,x
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@ -215,9 +218,10 @@ CopyDynamicTileTwoLyr
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jmp _DynFillJmpOpcode
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; Render a sprite on top of a dyamic tile with transparent areas shwing the second background
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; Render a sprite on top of a dyamic tile with transparent areas showing the second background
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DynamicOverTwoLyr
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lda TileStore+TS_JMP_ADDR,x ; Get the address of the exception handler
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ora #SNIPPET_ENTRY_1
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sta _JTBL_CACHE
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lda TileStore+TS_WORD_OFFSET,x
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@ -275,9 +279,19 @@ DynamicOverTwoLyr
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plb
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rts
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; Render a sprite on top of a dyamic tile with transparent areas shwing the second background
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; Render a sprite under a dyamic tile with transparent areas showing the second background
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;
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; This is a special case where we cannot fit the code into the fixed snippet structure. As such,
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; any tile drawn with this routine will set a DAMAGED flag on the TileStore flags. If another
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; tile blitter in the TwoLayer function set sees that a tile is marked as DAMAGED, it must
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; restore the original code structure before proceeding.
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;
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; The damages area is not too bad -- just the 10 bytes from [2, 10] are overwritten and must be
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; restored. This is actually less work than a lot of the snippet macros were doing before
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; applying the fixed snippet optimization.
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DynamicUnderTwoLyr
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lda TileStore+TS_JMP_ADDR,x ; Get the address of the exception handler
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ora #SNIPPET_ENTRY_1
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sta _JTBL_CACHE
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lda TileStore+TS_WORD_OFFSET,x
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@ -290,6 +304,8 @@ DynamicUnderTwoLyr
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; perform and EOR #$2080 to covert the opcode and operand in one instruction
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lda TileStore+TS_TILE_ID,x ; Get the original tile descriptor
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ora #TILE_DAMAGED_BIT ; Set the DAMAGED bit here since we have to load TILE_ID anyway
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sta TileStore+TS_TILE_ID,x
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and #$007F ; clamp to < (32 * 4)
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ora #$3580 ; Pre-calc the AND $80,x opcode + operand
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xba
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@ -368,18 +384,12 @@ mixed cmp #$FFFF ; All 1's in the mask is a fully transparent sp
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lda _OP_CACHE ; Get the LDA dp,x instruction for this column
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sta: $0000,x
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lda #$0029 ; AND #SPRITE_MASK
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sta: $0002,x
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lda tmp_sprite_mask+{]1}
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sta: $0003,x
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lda #$0009 ; ORA #SPRITE_DATA
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sta: $0005,x
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lda tmp_sprite_data+{]1}
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sta: $0006,x
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lda #$0D80 ; branch to the prologue (BRA *+15)
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sta: $0008,x
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bra next
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; This is a transparent word, so just show the dynamic data
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@ -410,10 +420,8 @@ CopyDynUnder MAC
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$7000} ; adjust for the current row offset
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sta: {]2}+1,y
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tax ; This becomes the new address that we use to patch in
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tax ; This becomes the new address that we use to patch in
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lda #$00A9 ; LDA #DATA
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sta: $0000,x
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lda tmp_sprite_data+{]1}
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sta: $0001,x
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@ -421,9 +429,6 @@ CopyDynUnder MAC
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sta: $0003,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0005,x ; ORA $00,x
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lda #$0E80 ; branch to the prologue (BRA *+16)
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sta: $0007,x
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eom
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; Masked renderer for a dynamic tile. What's interesting about this renderer is that the mask
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@ -449,22 +454,14 @@ CopyMaskedDWord MAC
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lda _JTBL_CACHE
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ora #{{]1}&$7000} ; adjust for the current row offset
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sta: {]1}+1,y
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tax ; This becomes the new address that we use to patch in
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lda _OP_CACHE
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sta: $0000,x ; LDA (00),y
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lda _OP_CACHE2
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sta: $0002,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0004,x ; ORA $00,x
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lda #$0F80 ; branch to the prologue (BRA *+17)
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sta: $0006,x
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; Version 2 only needs to set the JMP address to Entry Point 3
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; lda _JTBL_CACHE
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; ora #{{]1}&$7000} ; adjust for the current row offset
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; sta: {]1}+1,y
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eom
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; Version 2 will set the JMP to Entry Point 1 and set the Opcode at Entry Point 2 to a ora $00,x. Also
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@ -479,7 +476,7 @@ CopyMaskedDWord MAC
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; lda OP_CACHE_2 ; switch from AND to ORA instruction cached in setup
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; sta: $0004,x ; ORA $00,x
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CopyDynMaskedSpriteWord2 MAC
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CopyDynMaskedSpriteWord MAC
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; If MASK == 0, then we can do a PEA. If MASK == $FFFF, then fall back to the simple Dynamic Tile
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; code and eliminate the constant AND/ORA instructions.
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@ -489,7 +486,6 @@ CopyDynMaskedSpriteWord2 MAC
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; This is a solid word
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lda #$00F4 ; PEA instruction
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sta: {]2},y
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lda tmp_sprite_data+{]1} ; load the sprite data
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sta: {]2}+1,y ; PEA operand
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bra next
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@ -502,13 +498,14 @@ mixed
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lda #$004C ; JMP to handler
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sta: {]2},y
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$7000} ; adjust for the current row offset
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sta: {]2}+1,y
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tax ; This becomes the new address that we use to patch in
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lda _OP_CACHE2
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sta: $0002,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0004,x ; ORA $00,x
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lda tmp_sprite_mask+{]1}
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@ -524,51 +521,9 @@ transparent
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lda #$004C ; JMP to handler
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sta: {]2},y
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$7000}.ENTRY_POINT_2 ; adjust for the current row offset and OR in the offset since snippets are 32-byte aligned
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ora #{]2&$7000}.SNIPPET_ENTRY_4 ; adjust for the current row offset and OR in the offset since snippets are 32-byte aligned
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sta: {]2}+1,y
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next
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eom
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; Masked renderer for a masked dynamic tile with sprite data overlaid.
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;
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; ]1 : sprite plane offset
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; ]2 : code field offset
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CopyDynMaskedSpriteWord MAC
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; Need to fill in the first 14 bytes of the JMP handler with the following code sequence where
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; the data and mask from from the sprite plane
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;
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; lda ($00),y
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; and $80,x
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; ora $00,x
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; and #MASK
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; ora #DATA
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; bra *+15
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;
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; If MASK == 0, then we can do a PEA. If MASK == $FFFF, then fall back to the simple Dynamic Tile
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; code and eliminate the constant AND/ORA instructions.
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lda tmp_sprite_mask+{]1} ; load the mask value
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bne mixed ; a non-zero value may be mixed
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; This is a solid word
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lda #$00F4 ; PEA instruction
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sta: {]2},y
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lda tmp_sprite_data+{]1} ; load the sprite data
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sta: {]2}+1,y ; PEA operand
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bra next
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; We will always do a JMP to the exception handler, so set that up, then check for sprite
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; transparency
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mixed
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lda #$004C ; JMP to handler
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sta: {]2},y
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$7000} ; adjust for the current row offset
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sta: {]2}+1,y
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tax ; This becomes the new address that we use to patch in
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tax
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lda _OP_CACHE
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sta: $0000,x ; LDA (00),y
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@ -576,31 +531,9 @@ mixed
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sta: $0002,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0004,x ; ORA $00,x
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lda #$0029 ; AND #SPRITE_MASK
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sta: $0006,x
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lda tmp_sprite_mask+{]1}
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cmp #$FFFF ; All 1's in the mask is a fully transparent sprite word
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beq transparent
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sta: $0007,x
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lda #$0009 ; ORA #SPRITE_DATA
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sta: $0009,x
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lda tmp_sprite_data+{]1}
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sta: $000A,x
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lda #$0980 ; branch to the prologue (BRA *+11)
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sta: $000C,x
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bra next
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; This is a transparent word, so just show the dynamic data
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transparent
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lda #$0F80 ; branch to the epilogue (BRA *+17)
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sta: $0006,x
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next
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eom
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; Masked renderer for a masked dynamic tile with sprite data underlaid.
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;
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; ]1 : sprite plane offset
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@ -615,7 +548,12 @@ CopyDynPrioMaskedSpriteWord MAC
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; ora #DATA
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; and $80,x
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; ora $00,x
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; bra *+15
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; This macro has different targets based on the transparency
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lda tmp_sprite_mask+{]1}
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cmp #$FFFF ; All 1's in the mask is a fully transparent sprite word
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beq transparent
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lda #$004C ; JMP to handler
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sta: {]2},y
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@ -624,15 +562,10 @@ CopyDynPrioMaskedSpriteWord MAC
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sta: {]2}+1,y
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tax ; This becomes the new address that we use to patch in
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lda _OP_CACHE
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sta: $0000,x ; LDA (00),y
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lda #$0029 ; AND #SPRITE_MASK
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sta: $0002,x
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lda tmp_sprite_mask+{]1}
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cmp #$FFFF ; All 1's in the mask is a fully transparent sprite word
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beq transparent ; so we can use the Tile00011 method
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sta: $0003,x
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lda #$0009 ; ORA #SPRITE_DATA
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@ -645,19 +578,22 @@ CopyDynPrioMaskedSpriteWord MAC
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $000A,x ; ORA $00,x
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lda #$0980 ; branch to the prologue (BRA *+11)
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sta: $000C,x
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bra next
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; This is a transparent word, so just show the dynamic data
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transparent
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lda _OP_CACHE2
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sta: $0002,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0004,x ; ORA $00,x
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; This is a transparent word, so just show the dynamic data
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lda #$004C ; JMP to handler
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sta: {]2},y
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lda _JTBL_CACHE ; Get the offset to the exception handler for this column
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ora #{]2&$7000}.SNIPPET_ENTRY_4 ; adjust for the current row offset and OR in the offset since snippets are 32-byte aligned
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sta: {]2}+1,y
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tax
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lda #$0F80 ; branch to the epilogue (BRA *+17)
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sta: $0006,x
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lda _OP_CACHE
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sta: $0000,x ; LDA (00),y
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lda _OP_CACHE2
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sta: $0002,x ; AND $80,x
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eor #$8020 ; Switch the opcode to an ORA and remove the high bit of the operand
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sta: $0004,x ; ORA $00,x
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next
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eom
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