mirror of https://github.com/jeremysrand/BuGS.git
350 lines
7.9 KiB
Plaintext
350 lines
7.9 KiB
Plaintext
;
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; global.macros
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; BuGS
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;
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; Created by Jeremy Rand on 2020-07-30.
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;Copyright © 2020 Jeremy Rand. All rights reserved.
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;
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macro
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_drawDirtyGameRow &rowNum
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_drawDirtyGameRow_wait&rowNum anop
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; This code loads into the accumulator the line currently being drawn to the
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; screen by HW. It allows code to race just behind the beam and redraw the
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; screen.
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;
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; Based on code found here:
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; https://iigs.dreamhosters.com/gte/blitter.html
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;
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; Unlike that code, it does not change the baseline of the values. According
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; to GS technote 39, this number ranges from $fa to $1ff. Scan line zero is
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; $100 and scan line 199 is $1c7. We will race the beam by comparing to these
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; offset numbers.
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;
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; Also according to that technote, it looks like these numbers are different
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; in PAL mode. Do I need something here to handle PAL correctly? I switched
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; my GS to 50Hz mode (startup/reboot with option held down to get the menu)
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; and I didnt't detect any graphics glitches at all. I did notice that the
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; game is noticably easier because things run a bit slower. If I do an online
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; score system, I should record whether a score was gotten at 50Hz vs 60Hz.
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; (and in fact, I have since implemented online high scores and record the
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; frequency at which the game was played)
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lda >VERTICAL_COUNTER ; load the counter value
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and #$80ff ; mask out the VBL bits
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asl a ; shift the word around
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adc #0 ; move MSB -> LSB
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lcla &scanLineNum
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&scanLineNum seta &rowNum
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&scanLineNum seta &scanLineNum*8
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&scanLineNum seta &scanLineNum+264
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cmp #&scanLineNum
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blt _drawDirtyGameRow_wait&rowNum
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lcla &tileOffset
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&tileOffset seta &rowNum*50
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lcla &lastTileOffset
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&lastTileOffset seta 50+&tileOffset
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.drawDirtyGameRowLoop
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lda tileDirty+&tileOffset
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beq _drawDirtyGameRow_skip&tileOffset
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stz tileDirty+&tileOffset
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ldy tileScreenOffset+&tileOffset
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lda tileType+&tileOffset
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jsl drawTile
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_drawDirtyGameRow_skip&tileOffset anop
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&tileOffset seta &tileOffset+2
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aif &tileOffset<&lastTileOffset,.drawDirtyGameRowLoop
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mend
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macro
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_dirtyGameOrNonGameTile &tileOffset
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ldx &tileOffset
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cpx #RHS_FIRST_TILE_OFFSET
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bge _dirtyGameTile_nonGame&SYSCNT
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lda #TILE_STATE_DIRTY
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sta tileDirty,x
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bra _dirtyGameTile_skip&SYSCNT
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_dirtyGameTile_nonGame&SYSCNT anop
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lda tileDirty,x
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bne _dirtyGameTile_skip&SYSCNT
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lda #TILE_STATE_DIRTY
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sta tileDirty,x
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ldy numDirtyNonGameTiles
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txa
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sta dirtyNonGameTiles,y
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iny
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iny
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sty numDirtyNonGameTiles
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_dirtyGameTile_skip&SYSCNT anop
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mend
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macro
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_dirtyGameOrNonGameTileX &tileOffset
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ldy &tileOffset,x
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cpy #RHS_FIRST_TILE_OFFSET
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bge _dirtyGameTile_nonGame&SYSCNT
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lda #TILE_STATE_DIRTY
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sta tileDirty,y
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bra _dirtyGameTile_skip&SYSCNT
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_dirtyGameTile_nonGame&SYSCNT anop
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lda tileDirty,y
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bne _dirtyGameTile_skip&SYSCNT
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lda #TILE_STATE_DIRTY
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sta tileDirty,y
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tya
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ldy numDirtyNonGameTiles
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sta dirtyNonGameTiles,y
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iny
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iny
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sty numDirtyNonGameTiles
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_dirtyGameTile_skip&SYSCNT anop
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mend
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; Pass the tile offset to mark as dirty in the X register
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macro
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_dirtyNonGameTile
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lda tileDirty,x
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bne _dirtyNonGameTile_skip&SYSCNT
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lda #TILE_STATE_DIRTY
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sta tileDirty,x
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ldy numDirtyNonGameTiles
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txa
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sta dirtyNonGameTiles,y
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iny
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iny
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sty numDirtyNonGameTiles
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_dirtyNonGameTile_skip&SYSCNT anop
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mend
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macro
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_overwriteGameTile &type
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lda #&type
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jsl overwriteGameTile
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mend
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macro
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_setGameTile &type
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lda #&type
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jsl setGameTile
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mend
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macro
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_highScoreRow &nthScore
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ldy #SETTINGS_HIGH_SCORE_OFFSET+HIGH_SCORE_SCORE_TEXT_OFFSET+&nthScore*SETTINGS_HIGH_SCORE_SIZE
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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lda #TILE_EMPTY
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda settings,y
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jsl asciiToTileType
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jsl setGameTile
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mend
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macro
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_globalHighScoreRow &nthScore
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ldy #2+&nthScore*SETTINGS_HIGH_SCORE_SIZE
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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lda #TILE_EMPTY
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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iny
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lda highScoreResponse,y
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jsl asciiToTileType
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jsl setGameTile
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mend
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; Update the score
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macro
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_incrementScore &increment
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lda playerNum
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asl a
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tax
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lda #&increment
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clc
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adc gameScore,x
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sta gameScore,x
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bcc _incrementScore_noCarry&SYSCNT
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inc gameScore+2,x
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_incrementScore_noCarry&SYSCNT anop
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ldx playerNum
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lda #&increment
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clc
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adc scoreWithin12000,x
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cmp #12000
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blt _incrementScore_noExtraMan&SYSCNT
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sec
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sbc #12000
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pha
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jsl playerAddLife
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pla
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ldx playerNum
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_incrementScore_noExtraMan&SYSCNT anop
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sta scoreWithin12000,x
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lda #&increment
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clc
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adc scoreWithin20000,x
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cmp #20000
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blt _incrementScore_no2000&SYSCNT
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sec
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sbc #20000
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inc scoreNum20000,x
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_incrementScore_no2000&SYSCNT anop
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sta scoreWithin20000,x
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mend
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; Wait for the DOC to be ready
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macro
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_docWait
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_docWait_&SYSCNT anop
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lda >SOUND_CONTROL_REG
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bmi _docWait_&SYSCNT
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mend
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macro
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_writeReg ®,&value
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ldy ®
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lda &value
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jsr writeReg
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mend
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