313 lines
14 KiB
ArmAsm
313 lines
14 KiB
ArmAsm
; Global addresses and engine values
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SHADOW_REG equ $E0C035
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STATE_REG equ $E0C068
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NEW_VIDEO_REG equ $E0C029
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BORDER_REG equ $E0C034 ; 0-3 = border, 4-7 Text color
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VBL_VERT_REG equ $E0C02E
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VBL_HORZ_REG equ $E0C02F
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KBD_REG equ $E0C000
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KBD_STROBE_REG equ $E0C010
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VBL_STATE_REG equ $E0C019
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MOD_REG equ $E0C025
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COMMAND_KEY_REG equ $E0C061
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OPTION_KEY_REG equ $E0C062
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SHADOW_SCREEN equ $012000
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SHADOW_SCREEN_SCB equ $019D00
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SHADOW_SCREEN_PALETTES equ $019E00
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SHR_SCREEN equ $E12000
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SHR_SCB equ $E19D00
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SHR_PALETTES equ $E19E00
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SHR_LINE_WIDTH equ 160
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SHR_SCREEN_HEIGHT equ 200
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; Direct page locations used by the engine
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ScreenHeight equ 0 ; Height of the playfield in scan lines
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ScreenWidth equ 2 ; Width of the playfield in bytes
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ScreenY0 equ 4 ; First vertical line on the physical screen of the playfield
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ScreenY1 equ 6 ; End of playfield on the physical screen. If the height is 20 and Y0 is
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ScreenX0 equ 8 ; 100, then ScreenY1 = 120.
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ScreenX1 equ 10
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ScreenTileHeight equ 12 ; Height of the playfield in 8x8 blocks
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ScreenTileWidth equ 14 ; Width of the playfield in 8x8 blocks
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StartX equ 16 ; Which code buffer byte is the left edge of the screen. Range = 0 to 167
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StartY equ 18 ; Which code buffer line is the top of the screen. Range = 0 to 207
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EngineMode equ 20 ; Defined the mode/capabilities that are enabled
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; bit 0: 0 = Single Background, 1 = Parallax
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; bit 1: 0 = No Dynamic Tiles, 1 = Allocate Bank 00 space for dynamic tiles
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; bit 2: 0 = No static buffer, 1 = Allocation Bank 00 space for a static screen buffer
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DirtyBits equ 22 ; Identify values that have changed between frames
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CompileBank0 equ 24 ; Always zero to allow [CompileBank0],y addressing
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CompileBank equ 26 ; Data bank that holds compiled sprite code
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BlitterDP equ 28 ; Direct page address that holds blitter data
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OldStartX equ 30 ; Used to track deltas between frames
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OldStartY equ 32
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LastPatchOffset equ 34 ; Offset into code field that was patched with BRA instructions
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StartXMod164 equ 36
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StartYMod208 equ 38
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BG1StartX equ 40 ; Logical offset of the second background
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BG1StartXMod164 equ 42
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BG1StartY equ 44
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BG1StartYMod208 equ 46
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OldBG1StartX equ 48
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OldBG1StartY equ 50
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BG1OffsetIndex equ 52 ; Utility index for scanline effect in BG1
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BG0TileOriginX equ 54 ; Coordinate in the tile map that corresponds to the top-left corner
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BG0TileOriginY equ 56
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OldBG0TileOriginX equ 58
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OldBG0TileOriginY equ 60
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BG1TileOriginX equ 62 ; Coordinate in the tile map that corresponds to the top-left corner
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BG1TileOriginY equ 64
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OldBG1TileOriginX equ 66
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OldBG1TileOriginY equ 68
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TileMapWidth equ 70 ; Pointer to memory holding the tile map for the primary background
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TileMapHeight equ 72
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TileMapPtr equ 74
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FringeMapPtr equ 78
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BG1TileMapWidth equ 82
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BG1TileMapHeight equ 84
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BG1TileMapPtr equ 86 ; Pointer to memory holding the tile map for the secondary background
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SCBArrayPtr equ 90 ; Used for palette binding
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SpriteBanks equ 94 ; Bank bytes for the sprite data and sprite mask
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LastRender equ 96 ; Record which render function was last executed
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CompileBankTop equ 98 ; First free byte i nthe compile bank. Grows upward in memeory.
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SpriteMap equ 100 ; Bitmap of open sprite slots.
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ActiveSpriteCount equ 102
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BG1DataBank equ 104 ; Data bank that holds BG1 layer data
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TileStoreBankAndBank01 equ 106
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TileStoreBankAndTileDataBank equ 108
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TileStoreBankDoubled equ 110
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UserId equ 112 ; Memory manager user Id to use
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ToolNum equ 114 ; Tool number assigned to us
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LastKey equ 116
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LastTick equ 118
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ForceSpriteFlag equ 120
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SpriteRemovedFlag equ 122 ; Indicate if any sprites were removed this frame
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RenderFlags equ 124 ; Flags passed to the Render() function
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BG1Scaling equ 126
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activeSpriteList equ 128 ; 32 bytes for the active sprite list (can persist across frames)
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; Free space from 160 to 192
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blttmp equ 192 ; 32 bytes of local cache/scratch space for blitter
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tmp8 equ 224 ; another 16 bytes of temporary space to be used as scratch
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tmp9 equ 226
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tmp10 equ 228
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tmp11 equ 230
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tmp12 equ 232
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tmp13 equ 234
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tmp14 equ 236
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tmp15 equ 238
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tmp0 equ 240 ; 16 bytes of temporary space to be used as scratch
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tmp1 equ 242
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tmp2 equ 244
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tmp3 equ 246
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tmp4 equ 248
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tmp5 equ 250
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tmp6 equ 252
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tmp7 equ 254
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; Defines for the second direct page (used in the tile blitters)
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sprite_ptr0 equ 0 ; Each tile can render up to 4 sprite blocks. The sprite
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sprite_ptr1 equ 4 ; data and mask values live in different banks, but have a
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sprite_ptr2 equ 8 ; parallel structure. The high word of each point is set to
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sprite_ptr3 equ 12 ; the mask bank. With the Bank register set, both data and mask
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; ; can be accessed through the same pointer, e.g. lda (sprite_ptr0)
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; ; and [sprite_ptr0]
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tmp_sprite_data equ 16 ; 32 byte temporary buffer to build up sprite data values
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tmp_sprite_mask equ 48 ; 32 byte temporary buffer to build up sprite mask values
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tmp_tile_data equ 80 ; 32 byte temporary buffer to build up tile data values
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tmp_tile_mask equ 112 ; 32 byte temporary buffer to build up tile mask values
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; Temporary direct page locations used by some of the complex tile renderers
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_X_REG equ 144
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_Y_REG equ 146
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_T_PTR equ 148 ; Copy of the tile address pointer
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_OP_CACHE2 equ 148 ; CAche of second opcode
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_BASE_ADDR equ 150 ; Copy of BTableLow for this tile
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_SPR_X_REG equ 152 ; Cache address of sprite plane source for a tile
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_JTBL_CACHE equ 154 ; Cache the offset to the exception handler for a column
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_OP_CACHE equ 156 ; Cache of a relevant operand / oeprator
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_TILE_ID equ 158 ; Copy of the tile descriptor
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; Define free space the the application to use
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; FREE_SPACE_DP2 equ 160
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DP2_DIRTY_TILE_COUNT equ 160 ; Local copy of dirty tile count to avoid banking
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DP2_DIRTY_TILE_CALLBACK equ 162
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; Some pre-defined bank values
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DP2_TILEDATA_AND_TILESTORE_BANKS equ 164
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DP2_SPRITEDATA_AND_TILESTORE_BANKS equ 166
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DP2_TILEDATA_AND_SPRITEDATA_BANKS equ 168
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DP2_BANK01_AND_TILESTORE_BANKS equ 170
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SPRITE_VBUFF_PTR equ 224 ; 32 bytes of adjusted pointers to VBuffArray addresses
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; End direct page values
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; EngineMode definitions
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ENGINE_MODE_TWO_LAYER equ $0001
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ENGINE_MODE_DYN_TILES equ $0002
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ENGINE_MODE_BNK0_BUFF equ $0004
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ENGINE_MODE_USER_TOOL equ $8000 ; Communicate if GTE is loaded as a system tool, or a user tool
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; Render flags
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RENDER_ALT_BG1 equ $0001
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RENDER_BG1_HORZ_OFFSET equ $0002
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RENDER_BG1_VERT_OFFSET equ $0004
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RENDER_BG1_ROTATION equ $0008
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RENDER_PER_SCANLINE equ $0010
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RENDER_WITH_SHADOWING equ $0020
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RENDER_SPRITES_SORTED equ $0040 ; Draw the sprites in y-sorted order. Otherwise, use the index.
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; DirtyBits definitions
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DIRTY_BIT_BG0_X equ $0001
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DIRTY_BIT_BG0_Y equ $0002
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DIRTY_BIT_BG1_X equ $0004
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DIRTY_BIT_BG1_Y equ $0008
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DIRTY_BIT_BG0_REFRESH equ $0010
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DIRTY_BIT_BG1_REFRESH equ $0020
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DIRTY_BIT_SPRITE_ARRAY equ $0040
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; GetAddress table IDs
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scanlineHorzOffset equ $0001 ; Table of 416 words, a double-array of scanline offset values. Values must be in range [0, 163]
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scanlineHorzOffset2 equ $0002 ; Table of 416 words, a double-array of scanline offset values. Values must be in range [0, 163]
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tileStore equ $0003
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vblCallback equ $0004 ; User routine to be called by VBL interrupt. Set to $000000 to disconnect
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; CopyPicToBG1 flags
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COPY_PIC_NORMAL equ $0000 ; Copy into BG1 buffer in "normal mode" treating the buffer as a 164x208 pixmap with stride of 256
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COPY_PIC_SCANLINE equ $0001 ; Copy in a way to support BG1 + RENDER_PER_SCANLINE. Pixmap is double-width, 327x200 with stride of 327
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; Script definition
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YIELD equ $8000
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JUMP equ $4000
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SET_PALETTE_ENTRY equ $0002
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SWAP_PALETTE_ENTRY equ $0004
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SET_DYN_TILE equ $0006
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CALLBACK equ $0010
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; ReadControl return value bits
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PAD_BUTTON_B equ $0100
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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_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_USER_BIT equ $2000 ; User-defined tile. Execute registered callback.
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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 $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_OVERLAY equ $8000 ; This is an overlay record. Stored as a sprite for render ordering purposes
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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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SPRITE_HIDE equ $2000 ; Do not render the sprite
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SPRITE_16X16 equ $1800 ; 16 pixels wide x 16 pixels tall
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SPRITE_16X8 equ $1000 ; 16 pixels wide x 8 pixels tall
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SPRITE_8X16 equ $0800 ; 8 pixels wide x 16 pixels tall
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SPRITE_8X8 equ $0000 ; 8 pixels wide x 8 pixels tall
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SPRITE_VFLIP equ $0400 ; Flip the sprite vertically
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SPRITE_HFLIP equ $0200 ; Flip the sprite horizontally
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; Overlay bits (aliases of SPRITE_ID bits)
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OVERLAY_MASKED equ $0000 ; Overlay has a mask, so the background must be draw first
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OVERLAY_SOLID equ $4000 ; Overlay covers the scan line and is fully opaque
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OVERLAY_ABOVE equ $0000 ; Overlay is drawn above scanline sprites
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OVERLAY_BELOW equ $2000 ; Overlay is drawn below scanline sprites
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; Stamp storage parameters
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VBUFF_STRIDE_BYTES equ {12*4} ; Each line has 4 slots of 16 pixels + 8 buffer pixels
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VBUFF_TILE_ROW_BYTES equ {8*VBUFF_STRIDE_BYTES} ; Each row is comprised of 8 lines
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VBUFF_TILE_COL_BYTES equ 4
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VBUFF_SPRITE_STEP equ {VBUFF_TILE_ROW_BYTES*3} ; Allocate space for 16 rows + 8 rows of buffer
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VBUFF_SPRITE_START equ {VBUFF_TILE_ROW_BYTES+4} ; Start at an offset so $0000 can be used as an empty value
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VBUFF_SLOT_COUNT equ 48 ; Have space for this many stamps
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; This is 13 blocks wide
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SPRITE_PLANE_SPAN equ VBUFF_STRIDE_BYTES
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; External references to data bank
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TileStore EXT
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DirtyTileCount EXT
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DirtyTiles EXT
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_Sprites EXT
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TileStore EXT
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TileStoreLookupYTable EXT
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TileStoreLookup EXT
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Col2CodeOffset EXT
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JTableOffset EXT
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CodeFieldEvenBRA EXT
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CodeFieldOddBRA EXT
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ScreenAddr EXT
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TileStoreYTable EXT
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NextCol EXT
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RTable EXT
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BlitBuff EXT
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BTableHigh EXT
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BTableLow EXT
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BRowTableHigh EXT
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BRowTableLow EXT
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BG1YTable EXT
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BG1YOffsetTable EXT
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OldOneSecVec EXT
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OneSecondCounter EXT
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Timers EXT
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DefaultPalette EXT
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ScreenModeWidth EXT
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ScreenModeHeight EXT
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_SpriteBits EXT
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_SpriteBitsNot EXT
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VBuffArray EXT
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_stamp_step EXT
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VBuffVertTableSelect EXT
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VBuffHorzTableSelect EXT
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; Overlays EXT
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BG1YCache EXT
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ScalingTables EXT
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;StartXMod164Arr EXT
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;LastPatchOffsetArr EXT
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_SortedHead EXT
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_ShadowListCount EXT
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_ShadowListTop EXT
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_ShadowListBottom EXT
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_DirectListCount EXT
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_DirectListTop EXT
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_DirectListBottom EXT
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ObjectListCount EXT
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ObjectListHead EXT
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ObjectList EXT
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StartXMod164Tbl EXT
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LastOffsetTbl EXT
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BG1StartXMod164Tbl EXT
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; Tool error codes
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NO_TIMERS_AVAILABLE equ 10
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