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Merge branch 'master' of https://github.com/badvision/lawless-legends
This commit is contained in:
Martin Haye
commit
1e04d813a8
@ -19,7 +19,7 @@ MAX_MAP_ID=254 ; This means that the total map area can be as big as 5588x5842 t
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REL_X=$50 ; Will always be in the range 0-43
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REL_Y=$51 ; Will always be in the range 0-45
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; Map quadrant data pointers
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; Map quadrant data pointers (Maybe move these to screen holes in 2078-207f? There might be no advantage to using ZP for these)
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NW_MAP_LOC=$52
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NE_MAP_LOC=$54
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SW_MAP_LOC=$56
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@ -36,6 +36,15 @@ EAST =1
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SOUTH =2
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WEST =3
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;-- Variables used in drawing
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DRAW_X_START = $5E ; Starting column being drawn (between 0 and VIEWPORT_WIDTH)
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DRAW_Y_START = $5F ; Starting row being drawn (between 0 and VIEWPORT_WIDTH)
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SECTION_X_START = $60 ; X Offset relative to current section being drawn
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SECTION_Y_START = $61 ; Y Offset relative to current section being drawn
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DRAW_WIDTH = $62 ; Number of columns to draw for current section
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DRAW_HEIGTH = $63 ; Number of rows to draw for current section
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DRAW_SECTION = $64 ; Location of section data being drawn
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; >> INIT (reset map drawing vars)
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INIT
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LDA #NOT_LOADED
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@ -131,9 +140,9 @@ FINISH_LOAD
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; (Returns Tile # in Y, Flags in A)
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; Each tile in memory can be 0-64, the flags are the upper 3 bits
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; 0 0 0
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; | | `- Boundary (Can not cross)
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; | `--- Requires special (rope, raft, etc)
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; `----- Script assigned, triggers script lookup
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; | | `- Script assigned, triggers script lookup
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; | `--- Boundary (Can not walk on it)
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; `----- Visible obstruction (Can not see behind it)
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;----------------------------------------------------------------------
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; >> SET X,Y COORDINATES FOR VIEWPORT CENTER
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SET_XY
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@ -272,27 +281,45 @@ CROSS_WEST
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SBC #(deltaX+VIEWPORT_HORIZ_PAD)
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TAX
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BPL .10
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;This section isn't at the edge, note that
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EOR #$FF
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ADC #$00 ; Carry is still set, so this is really +1
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BPL .11 ; Should be always true
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.10 LDA #0
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.11 STA X1
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LDA #0
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.10 STA SECTION_X_START
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TXA
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CLC
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ADC VIEWPORT_WIDTH
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CMP SECTION_WIDTH
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BLT .12
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LDA #SECTION_WIDTH-1
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.12 STA X2
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}
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ADC #VIEWPORT_WIDTH
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CMP #SECTION_WIDTH
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BLT .11
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LDA #SECTION_WIDTH
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.11
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SEC
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SBC SECTION_X_START
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STA DRAW_WIDTH
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; Determine Y1 and Y2 bounds for what is being drawn
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LDA REL_Y
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SEC
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SBC #(deltaY+VIEWPORT_VERT_PAD)
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TAX
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BPL .20
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LDA #0
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.20 STA SECTION_Y_START
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TXA
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CLC
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ADC #VIEWPORT_HEIGHT
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CMP #SECTION_HEIGHT
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BLT .21
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LDA #SECTION_HEIGHT
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.21
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SEC
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SBC SECTION_Y_START
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STA DRAW_HEIGHT
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!move_word ptr, DRAW_SECTION
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jsr mainDraw
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}
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DRAW
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; For each quadrant, display relevant parts of screen
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LDA #00
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STA DRAW_X_START
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STA DRAW_Y_START
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.checkNorthQuads
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LDA REL_Y
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CMP SECTION_HEIGHT+VIEWPORT_VERT_PAD
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@ -302,22 +329,56 @@ DRAW
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CMP SECTION_WIDTH+VIEWPORT_HORIZ_PAD
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BGE .checkNEQuad
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!drawMapSection NW_MAP_LOC, 0, 0
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LDA NW_MAP_LOC+1
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BNE .drawNW
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.drawNW
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; Check for NE quadrant area
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.checkNEQuad
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LDA REL_X
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CMP #VIEWPORT_HORIZ_PAD+1
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BLT .finishTopQuads
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LDA DRAW_WIDTH
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STA DRAW_X_START
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!drawMapSection NE_MAP_LOC, SECTION_WIDTH, 0
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.finishTopQuads
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;Update Y start for bottom quadrants
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LDA DRAW_HEIGHT
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STA DRAW_Y_START
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;-----
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.checkSouthQuads
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LDA #00
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STA DRAW_X_START
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; Check for SW quadrant area
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LDA REL_X
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CMP SECTION_WIDTH+VIEWPORT_HORIZ_PAD
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BGE .checkSEQuad
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; Check for SE quadrand area
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!drawMapSection SW_MAP_LOC, 0, SECTION_HEIGHT
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.checkSEQuad
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; Check for SE quadrand area
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LDA REL_X
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CMP #VIEWPORT_HORIZ_PAD+1
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BGE .drawSEQuad
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RTS
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.drawSEQuad
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LDA DRAW_WIDTH
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STA DRAW_X_START
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!drawMapSection SE_MAP_LOC, SECTION_WIDTH, SECTION_HEIGHT
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RTS
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.mainDraw
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;----- Tracking visible tile data -----
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;There are a total of 512 screen holes in a hires page located in xx78-xx7F and xxF8-xxFF
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;We only need 81 screen holes to track the 9x9 visible area. So to do this a little translation is needed
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; 78 79 7a 7b 7c 7d 7e 7f f8
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;2000
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;2100
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;2200
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; .
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; .
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;2800
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;
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; The calculation goes like this: Page + $78 + (Row * $100) + (Col & 7) + ((Col & 8) << 4)
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; When the display is drawn, the screen hole is compared to see if there is a different tile to draw
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; and if there isn't then the tile is skipped. Otherwise the tile is drawn, etc.
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;--------------------------------------
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; Identify start of map data (upper left)
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; Display row of tiles
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; Get tile
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