mirror of
https://github.com/badvision/lawless-legends.git
synced 2024-12-24 21:30:11 +00:00
Now handles variable sized maps, and many textures.
This commit is contained in:
Martin Haye
parent
2c3931c826
commit
af12b3862e
@ -38,6 +38,9 @@
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<copy todir="${build.dir}/root/assets">
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<fileset dir="./data/images" includes="*.bin*"/>
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</copy>
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<copy todir="${build.dir}/root/assets">
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<fileset dir="./data/maps" includes="*.bin*"/>
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</copy>
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<copy todir="${build.dir}/root/assets">
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<fileset dir="./data/tables" includes="*.bin*"/>
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</copy>
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@ -3,10 +3,10 @@
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; Constants
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TOP_LINE = $2180 ; 24 lines down from top
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NLINES = 128
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SKY_COLOR_E = 1 ; blue
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SKY_COLOR_O = 1 ; blue
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GROUND_COLOR_E = 4 ; orange
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GROUND_COLOR_O = 0 ; black
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SKY_COLOR_E = $11 ; blue
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SKY_COLOR_O = $11 ; blue
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GROUND_COLOR_E = $14 ; orange
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GROUND_COLOR_O = $00 ; black
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TEX_SIZE = $555 ; 32x32 + 16x16 + 8x8 + 4x4 + 2x2 + 1x1
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; Byte offset for each pixel in the blit unroll
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@ -21,21 +21,21 @@ BLIT_OFF6 = 24
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BLIT_STRIDE = 29
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; Renderer zero page
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lineCt = $3 ; len 1
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txNum = $4 ; len 1
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txColumn = $5 ; len 1
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pLine = $6 ; len 2
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playerDir = $3 ; len 1
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playerX = $4 ; len 2 (hi=integer, lo=fraction)
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playerY = $6 ; len 2 (hi=integer, lo=fraction)
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pDst = $8 ; len 2
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pTex = $A ; len 2
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pixNum = $C ; len 1
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byteNum = $D ; len 1
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pTmp = $E ; len 2
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tmp = $10 ; len 2
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backBuf = $12 ; len 1 (value 0 or 1)
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frontBuf = $13 ; len 1 (value 0 or 1)
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mapWidth = $12 ; len 1
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mapHeight = $13 ; len 1
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pRayData = $14 ; len 2
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playerX = $16 ; len 2 (hi=integer, lo=fraction)
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playerY = $18 ; len 2 (hi=integer, lo=fraction)
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txNum = $16 ; len 1
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txColumn = $17 ; len 1
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pLine = $18 ; len 2
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rayDirX = $1A ; len 1
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rayDirY = $1B ; len 1
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stepX = $1C ; len 1
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@ -48,42 +48,34 @@ deltaDistX = $52 ; len 1
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deltaDistY = $53 ; len 1
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dist = $54 ; len 2
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diff = $56 ; len 2
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playerDir = $58 ; len 1
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pMap = $58 ; len 2
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lineCt = $5A ; len 1
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; Other monitor locations
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a2l = $3E
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a2h = $3F
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resetVec = $3F2
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; Tables and buffers
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decodeTo01 = $800
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decodeTo23 = $900
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decodeTo45 = $A00
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decodeTo56 = $B00
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decodeTo57 = $C00
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clrBlitRollE = $D00 ; size 3*(128/2) = $C0, plus 2 for tya and rts
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clrBlitRollO = $DC2 ; size 3*(128/2) = $C0, plus 2 for tya and rts
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XF00 = $E00 ; unused
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prodosBuf = $AC00 ; temporary, before building the tables
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screen = $2000
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;---------------------------------
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; The following are all in aux mem...
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expandVec = $800 ; size with expandCode: $30E9
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expandCode = $900
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expandVec = $800 ; size of expansion code: $30E9
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textures = $3900
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tex0 = textures
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tex1 = tex0+TEX_SIZE
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tex2 = tex1+TEX_SIZE
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tex3 = tex2+TEX_SIZE
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texEnd = tex3+TEX_SIZE
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; back to main mem
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;---------------------------------
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blitRoll = $B000 ; Unrolled blitting code. Size 29*128 = $E80, plus 1 for rts
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MLI = $BF00 ; Entry point for ProDOS MLI
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memMap = $BF58 ; ProDOS memory map
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; Main-mem tables and buffers
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decodeTo01 = $A900
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decodeTo23 = $AA00
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decodeTo45 = $AB00
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decodeTo56 = $AC00
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decodeTo57 = $AD00
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clrBlitRollE = $AE00 ; size 3*(128/2) = $C0, plus 2 for tya and rts
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clrBlitRollO = $AEC2 ; size 3*(128/2) = $C0, plus 2 for tya and rts
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XAF84 = $AF84 ; unused
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prodosBuf = $B000 ; temporary, before building the tables
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blitRoll = $B000 ; Unrolled blitting code. Size 29*128 = $E80, plus 1 for rts
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MLI = $BF00 ; Entry point for ProDOS MLI
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memMap = $BF58 ; ProDOS memory map
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; I/O locations
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kbd = $C000
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@ -3,22 +3,28 @@
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.pc02 ; Enable 65c02 ops
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; This code is written bottom-up. That is,
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; simple routines first, then routines that
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; call those to build complexity. The main
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; This code is written bottom-up. That is, simple routines first,
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; then routines that call those to build complexity. The main
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; code is at the very end. We jump to it now.
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jmp test
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jmp main
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; Conditional assembly flags
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DOUBLE_BUFFER = 1 ; whether to double-buffer
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DEBUG = 0 ; turn on verbose logging
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DOUBLE_BUFFER = 1 ; whether to double-buffer
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DEBUG = 0 ; turn on verbose logging
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; Shared constants, zero page, buffer locations, etc.
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.include "render.i"
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; Variables
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backBuf: .byte 0 ; (value 0 or 1)
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frontBuf: .byte 0 ; (value 0 or 1)
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mapBase: .word 0
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nTextures: .byte 0
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; texture addresses
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texAddrLo: .byte <tex0,<tex1,<tex2,<tex3
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texAddrHi: .byte >tex0,>tex1,>tex2,>tex3
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MAX_TEXTURES = 20
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texAddrLo: .res MAX_TEXTURES
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texAddrHi: .res MAX_TEXTURES
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; Movement amounts when walking at each angle
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; Each entry consists of an X bump and a Y bump, in 8.8 fixed point
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@ -45,7 +51,7 @@ walkDirs:
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.if DEBUG
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php
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pha
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jsr _debugStr
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jsr _writeStr
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.byte str,0
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pla
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plp
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@ -90,11 +96,30 @@ walkDirs:
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.endif
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.endmacro
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; Debug support to print a string following the JSR, in high or low bit ASCII,
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.macro DEBUG_RDKEY
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.if DEBUG
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php
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pha
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phx
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phy
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jsr rdkey
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ply
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plx
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pla
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plp
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.endif
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.endmacro
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; Non-debug function to print a string. Does not preserve registers.
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.macro WRITE_STR str
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jsr _writeStr
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.byte str,0
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.endmacro
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; Support to print a string following the JSR, in high or low bit ASCII,
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; terminated by zero. If the string has a period "." it will be followed
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; automatically by the next address and a CR.
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.if DEBUG
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_debugStr:
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_writeStr:
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pla
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clc
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adc #1
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@ -133,7 +158,6 @@ _debugStr:
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lda @ld+1
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pha
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rts
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.endif
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;-------------------------------------------------------------------------------
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; Multiply two bytes, quickly but somewhat inaccurately, using logarithms.
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@ -264,6 +288,7 @@ pow2_w_w:
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; Cast a ray
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; Input: pRayData, plus Y reg: precalculated ray data (4 bytes)
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; playerX, playerY (integral and fractional bytes of course)
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; pMap: pointer to current row on the map (mapBase + playerY{>}*height)
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; Output: lineCt - height to draw in double-lines
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; txColumn - column in the texture to draw
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castRay:
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@ -301,12 +326,6 @@ castRay:
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DEBUG_BYTE deltaDistY
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DEBUG_LN
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; Start at the player's position
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lda playerX+1
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sta mapX
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lda playerY+1
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sta mapY
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; Next we need to calculate the initial distance on each side
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; Start with the X side
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lda playerX ; fractional byte of player distance
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@ -333,14 +352,11 @@ castRay:
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DEBUG_BYTE sideDistY
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DEBUG_LN
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; We're going to use the Y register to index the map. Initialize it.
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lda mapY
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asl ; assume map is 16 tiles wide...
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asl
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asl ; ...multiplying by 16
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asl
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adc mapX ; then add X to get...
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tay ; ...starting index into the map.
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; Start at the player's position, and init Y reg for stepping in the X dir
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ldy playerX+1
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sty mapX
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lda playerY+1
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sta mapY
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; the DDA algorithm
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@DDA_step:
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@ -368,7 +384,7 @@ castRay:
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sta sideDistY
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lda deltaDistX ; re-init X distance
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sta sideDistX
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lda mapData,y ; check map at current X/Y position
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lda (pMap),y ; check map at current X/Y position
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beq @DDA_step ; nothing there? do another step.
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; We hit something!
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@hitX:
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@ -403,31 +419,35 @@ castRay:
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.endif
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; taking a step in the Y direction
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@takeStepY:
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tya ; get ready to adjust Y by a whole line
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lda pMap ; get ready to switch map row
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bit stepY ; advance mapY in the correct direction
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bmi @negY
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inc mapY
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clc
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adc #16 ; next row in the map
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adc mapWidth
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bcc @checkY
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inc pMap+1
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bra @checkY
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@negY:
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dec mapY
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sec
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sbc #16
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sbc mapWidth
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bcs @checkY
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dec pMap+1
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@checkY:
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sta pMap
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.if DEBUG
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DEBUG_STR " sideY"
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jsr @debugSideData
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.endif
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tay ; row number to Y so we can index the map
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lda sideDistX ; adjust side dist in Y dir
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sec
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sbc sideDistY
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sta sideDistX
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lda deltaDistY ; re-init Y distance
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sta sideDistY
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lda mapData,y ; check map at current X/Y position
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bne @hitY ; nothing there? do another step.
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lda (pMap),y ; check map at current X/Y position
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bne @hitY ; nothing there? do another step.
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jmp @DDA_step
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@hitY:
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; We hit something!
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@ -546,6 +566,16 @@ castRay:
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DEBUG_STR "sdy="
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DEBUG_BYTE sideDistY
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DEBUG_LN
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DEBUG_STR " pMap="
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DEBUG_WORD pMap
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DEBUG_STR "y="
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sty tmp
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DEBUG_BYTE tmp
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DEBUG_STR "mapByte="
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lda (pMap),y
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sta tmp
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DEBUG_BYTE tmp
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DEBUG_LN
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rts
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@debugFinal:
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DEBUG_STR " lineCt="
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@ -602,6 +632,9 @@ drawRay:
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sta pTex
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lda texAddrHi,x
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sta pTex+1
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DEBUG_STR "Ready to call, pTex="
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DEBUG_WORD pTex
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DEBUG_LN
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; jump to the unrolled expansion code for the selected height
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lda lineCt
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asl
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@ -811,37 +844,6 @@ makeDecodeTbls:
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bne @shiftA
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rts
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; Clear all the memory we're going to fill
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clearMem:
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ldx #$10
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lda #$BE
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jmp clearScreen2
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; Clear the screens
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clearScreen:
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ldx #>screen
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.if DOUBLE_BUFFER
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lda #>screen + $40 ; both hi-res screens
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.else
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lda #>screen + $20 ; one hi-res screen
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.endif
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clearScreen2:
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sta @limit+1
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ldy #0
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sty pDst
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tya
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@outer:
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stx pDst+1
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@inner:
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sta (pDst),y
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iny
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bne @inner
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inx
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@limit:
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cpx #>screen + $20
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bne @outer
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rts
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; Build table of screen line pointers
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; on aux zero-page
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makeLines:
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@ -939,27 +941,55 @@ bload:
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jmp monitor
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@mliCommand: .res 10 ; 10 bytes should be plenty
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; Copy X pages starting at pg Y to aux mem
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copyToAux:
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sta setAuxWr
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sty pDst+1
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; Copy pTmp -> pDst (advancing both), length in X(lo) / Y(hi)
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copyMem:
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phx
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tya
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ldy #0
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sty pDst
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@lup:
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lda (pDst),y
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tax
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beq @lastPg
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@pageLup:
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lda (pTmp),y
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sta (pDst),y
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iny
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bne @lup
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bne @pageLup
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inc pTmp+1
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inc pDst+1
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dex
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bne @lup
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sta clrAuxWr
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bne @pageLup
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@lastPg:
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plx
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beq @done
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@byteLup:
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lda (pTmp),y
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sta (pDst),y
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inc pTmp
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bne :+
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inc pTmp+1
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: inc pDst
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bne :+
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inc pDst+1
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: dex
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bne @byteLup
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@done:
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rts
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; Test code to see if things really work
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test:
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; Read a byte from pTmp and advance it
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readPtmp:
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phy
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ldy #0
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lda (pTmp),y
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ply
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inc pTmp
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bne :+
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inc pTmp+1
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: cmp #0
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rts
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;-------------------------------------------------------------------------------
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initMem:
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DEBUG_STR "Clearing memory map."
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; Clear ProDOS mem map so it lets us load stuff anywhere we want
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; Clear ProDOS mem map so it lets us load stuff anywhere we want
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ldx #$18
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lda #1
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@memLup:
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@ -967,94 +997,150 @@ test:
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lda #0
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dex
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bne @memLup
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; Make reset go to monitor
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; Make reset go to monitor
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lda #<monitor
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sta resetVec
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lda #>monitor
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sta resetVec+1
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eor #$A5
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sta resetVec+2
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; Put ourselves high on the stack, then copy the expansion caller to low stack.
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ldx #$FF
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txs
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; Copy the expansion caller to low stack.
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ldx #12
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: lda @callIt,x
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sta $100,x
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dex
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bpl :-
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bra :+
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rts
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@callIt:
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sta setAuxRd
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jsr $10A
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sta clrAuxRd
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rts
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jmp (expandVec,x)
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:
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;-------------------------------------------------------------------------------
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; Establish the initial player position and direction
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setPlayerPos:
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; X=2.5
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lda #2
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sta playerX+1
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lda #$80
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sta playerX
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; Y=2.6
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lda #2
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; Y=1.5
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lda #1
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sta playerY+1
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lda #$80
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sta playerY
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; direction=0
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lda #0
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lda #12
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sta playerDir
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rts
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; Load the texture expansion code
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;-------------------------------------------------------------------------------
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; Load the texture expansion code, copy it to aux mem
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loadFiles:
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DEBUG_STR "Loading files."
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lda #>expandVec
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sta pTmp+1
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sta pDst+1
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pha
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lda #<expandVec
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sta pTmp
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sta pDst
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pha
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ldx #<@expandName
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lda #>@expandName
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jsr bload
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ldx #<(textures-expandVec)
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ldy #>(textures-expandVec)
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sta setAuxWr
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jsr copyMem
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sta clrAuxWr
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; Load the textures
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lda #>tex0
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; Load the map + texture pack
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lda #8 ; load at $800
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sta pTmp+1
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pha
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lda #<tex0
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lda #0
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sta pTmp
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pha
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ldx #<@tex0Name
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lda #>@tex0Name
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ldx #<@mapPackName
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lda #>@mapPackName
|
||||
jsr bload
|
||||
|
||||
lda #>tex1
|
||||
pha
|
||||
lda #<tex1
|
||||
pha
|
||||
ldx #<@tex1name
|
||||
lda #>@tex1name
|
||||
jsr bload
|
||||
; First comes the map
|
||||
jsr readPtmp
|
||||
cmp #'M'
|
||||
beq :+
|
||||
WRITE_STR "M rec missing."
|
||||
brk
|
||||
; map starts with width & height
|
||||
: jsr readPtmp
|
||||
sta mapWidth
|
||||
jsr readPtmp
|
||||
sta mapHeight
|
||||
; next comes length
|
||||
jsr readPtmp
|
||||
tax
|
||||
jsr readPtmp
|
||||
tay
|
||||
; then the map data
|
||||
lda pTmp
|
||||
sta mapBase
|
||||
lda pTmp+1
|
||||
sta mapBase+1
|
||||
; skip the map data to find the first texture
|
||||
txa
|
||||
clc
|
||||
adc pTmp
|
||||
sta pTmp
|
||||
tya
|
||||
adc pTmp+1
|
||||
sta pTmp+1
|
||||
|
||||
lda #>tex2
|
||||
pha
|
||||
lda #<tex2
|
||||
pha
|
||||
ldx #<@tex2name
|
||||
lda #>@tex2name
|
||||
jsr bload
|
||||
; Copy the textures to aux mem
|
||||
lda #<textures
|
||||
sta pDst
|
||||
lda #>textures
|
||||
sta pDst+1
|
||||
lda #0
|
||||
sta nTextures
|
||||
|
||||
lda #>tex3
|
||||
@cpTex:
|
||||
jsr readPtmp
|
||||
beq @cpTexDone
|
||||
cmp #'T'
|
||||
beq :+
|
||||
WRITE_STR "T rec missing"
|
||||
brk
|
||||
: jsr readPtmp ; len lo
|
||||
tax
|
||||
jsr readPtmp ; len hi
|
||||
pha
|
||||
lda #<tex3
|
||||
pha
|
||||
ldx #<@tex3name
|
||||
lda #>@tex3name
|
||||
jsr bload
|
||||
|
||||
; copy all the expansion code and textures to aux mem
|
||||
DEBUG_STR "Copying to aux mem."
|
||||
ldy #>expandVec
|
||||
ldx #>texEnd - expandVec + 1
|
||||
jsr copyToAux
|
||||
ldy nTextures ; record texture address
|
||||
lda pDst
|
||||
sta texAddrLo,y
|
||||
lda pDst+1
|
||||
sta texAddrHi,y
|
||||
inc nTextures
|
||||
ply
|
||||
sta setAuxWr
|
||||
jsr copyMem ; copy the texture to aux mem
|
||||
sta clrAuxWr
|
||||
bra @cpTex ; next texture
|
||||
@cpTexDone:
|
||||
DEBUG_STR "Loaded "
|
||||
DEBUG_BYTE nTextures
|
||||
DEBUG_STR "textures."
|
||||
.if DEBUG
|
||||
DEBUG_STR "tex1="
|
||||
lda texAddrLo+1
|
||||
sta tmp
|
||||
lda texAddrHi+1
|
||||
sta tmp+1
|
||||
DEBUG_WORD tmp
|
||||
DEBUG_LN
|
||||
.endif
|
||||
|
||||
; load the fancy frame
|
||||
DEBUG_STR "Loading frame."
|
||||
@ -1065,7 +1151,7 @@ test:
|
||||
ldx #<@frameName
|
||||
lda #>@frameName
|
||||
jsr bload
|
||||
|
||||
; copy the frame to the other buffer also
|
||||
.if DOUBLE_BUFFER
|
||||
lda #>$4000
|
||||
pha
|
||||
@ -1075,15 +1161,18 @@ test:
|
||||
lda #>@frameName
|
||||
jsr bload
|
||||
.endif
|
||||
rts
|
||||
|
||||
; Build all the unrolls and tables
|
||||
DEBUG_STR "Making tables."
|
||||
jsr makeBlit
|
||||
jsr makeClrBlit
|
||||
jsr makeDecodeTbls
|
||||
jsr makeLines
|
||||
@expandName: .byte 10
|
||||
.byte "/LL/EXPAND"
|
||||
@mapPackName: .byte 19
|
||||
.byte "/LL/ASSETS/MAP.PACK"
|
||||
@frameName: .byte 16
|
||||
.byte "/LL/ASSETS/FRAME"
|
||||
|
||||
; Set up front and back buffers
|
||||
;-------------------------------------------------------------------------------
|
||||
; Set up front and back buffers, go to hires mode, and clear for first blit.
|
||||
graphInit:
|
||||
lda #0
|
||||
sta frontBuf
|
||||
.if DOUBLE_BUFFER
|
||||
@ -1100,11 +1189,11 @@ test:
|
||||
|
||||
lda #63
|
||||
sta lineCt
|
||||
jsr clearBlit
|
||||
@oneLevel:
|
||||
lda #0
|
||||
sta pixNum
|
||||
sta byteNum
|
||||
jmp clearBlit
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; Render one whole frame
|
||||
renderFrame:
|
||||
.if DOUBLE_BUFFER
|
||||
jsr setBackBuf
|
||||
.endif
|
||||
@ -1118,12 +1207,46 @@ test:
|
||||
adc #>precast_0
|
||||
sta pRayData+1
|
||||
|
||||
lda #0
|
||||
; Calculate pointer to the map row based on playerY
|
||||
lda mapBase ; start at row 0, col 0 of the map
|
||||
ldy mapBase+1
|
||||
ldx playerY+1 ; integral part of player's Y coord
|
||||
beq @gotMapRow
|
||||
clc
|
||||
@mapLup: ; advance forward one row
|
||||
adc mapWidth
|
||||
bcc :+
|
||||
iny
|
||||
clc
|
||||
: dex ; until we reach players Y coord
|
||||
bne @mapLup
|
||||
@gotMapRow:
|
||||
tax ; map row ptr now in X(lo) / Y(hi)
|
||||
|
||||
.if DEBUG
|
||||
phx
|
||||
phy
|
||||
stx tmp
|
||||
sty tmp+1
|
||||
DEBUG_STR "Initial pMap="
|
||||
DEBUG_WORD tmp
|
||||
DEBUG_LN
|
||||
ply
|
||||
plx
|
||||
.endif
|
||||
|
||||
lda #0
|
||||
sta pixNum
|
||||
sta byteNum
|
||||
; A-reg needs to be zero at this point -- it is the ray offset.
|
||||
; Calculate the height, texture number, and texture column for one ray
|
||||
@oneCol:
|
||||
pha ; save
|
||||
tay
|
||||
stx pMap ; set initial map pointer for the ray
|
||||
sty pMap+1
|
||||
phy ; save map row ptr
|
||||
phx
|
||||
pha ; save ray offset
|
||||
tay ; ray offset where it needs to be
|
||||
jsr castRay ; cast the ray across the map
|
||||
jsr drawRay ; and draw it
|
||||
.if DEBUG
|
||||
@ -1156,53 +1279,19 @@ test:
|
||||
inc byteNum
|
||||
@nextCol:
|
||||
pla
|
||||
plx
|
||||
ply
|
||||
clc
|
||||
adc #4 ; advance to next ray
|
||||
ldx byteNum
|
||||
cpx #18
|
||||
beq @nextLevel
|
||||
jmp @oneCol
|
||||
|
||||
@nextLevel:
|
||||
; flip onto the screen
|
||||
.if DOUBLE_BUFFER
|
||||
ldx backBuf
|
||||
lda frontBuf
|
||||
sta backBuf
|
||||
stx frontBuf
|
||||
lda page1,x
|
||||
.endif
|
||||
DEBUG_STR "Done rendering, waiting for key."
|
||||
@pauseLup:
|
||||
lda kbd
|
||||
bpl @pauseLup
|
||||
sta kbdStrobe ; eat the keypress
|
||||
; advance
|
||||
and #$7F
|
||||
cmp #'w'
|
||||
beq @forward
|
||||
cmp #'W'
|
||||
beq @forward
|
||||
cmp #'s'
|
||||
beq @backward
|
||||
cmp #'S'
|
||||
beq @backward
|
||||
cmp #'x'
|
||||
beq @backward
|
||||
cmp #'X'
|
||||
beq @backward
|
||||
cmp #'a'
|
||||
beq @left
|
||||
cmp #'A'
|
||||
beq @left
|
||||
cmp #'d'
|
||||
beq @right
|
||||
cmp #'D'
|
||||
beq @right
|
||||
cmp #$1B
|
||||
cmp #$FC ; check for end of ray table
|
||||
beq @done
|
||||
jmp @pauseLup
|
||||
@forward:
|
||||
jmp @oneCol ; go back for another ray
|
||||
@done:
|
||||
rts
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; Move the player forward a quarter step
|
||||
moveForward:
|
||||
lda playerDir
|
||||
asl
|
||||
asl
|
||||
@ -1221,8 +1310,11 @@ test:
|
||||
lda playerY+1
|
||||
adc walkDirs+3,x
|
||||
sta playerY+1
|
||||
jmp @oneLevel
|
||||
@backward:
|
||||
rts
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; Move the player forward a quarter step
|
||||
moveBackward:
|
||||
lda playerDir
|
||||
asl
|
||||
asl
|
||||
@ -1241,63 +1333,106 @@ test:
|
||||
lda playerY+1
|
||||
sbc walkDirs+3,x
|
||||
sta playerY+1
|
||||
jmp @oneLevel
|
||||
@left:
|
||||
rts
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; Rotate player 22.5 degrees to the left
|
||||
rotateLeft:
|
||||
dec playerDir
|
||||
lda playerDir
|
||||
cmp #$FF
|
||||
bne :+
|
||||
lda #15
|
||||
: sta playerDir
|
||||
jmp @oneLevel
|
||||
@right:
|
||||
rts
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; Rotate player 22.5 degrees to the right
|
||||
rotateRight:
|
||||
inc playerDir
|
||||
lda playerDir
|
||||
cmp #16
|
||||
bne :+
|
||||
lda #0
|
||||
: sta playerDir
|
||||
jmp @oneLevel
|
||||
rts
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; Flip back buffer onto the screen
|
||||
flip:
|
||||
.if DOUBLE_BUFFER
|
||||
ldx backBuf
|
||||
lda frontBuf
|
||||
sta backBuf
|
||||
stx frontBuf
|
||||
lda page1,x
|
||||
.endif
|
||||
rts
|
||||
|
||||
;-------------------------------------------------------------------------------
|
||||
; The real action
|
||||
main:
|
||||
; Put ourselves high on the stack
|
||||
ldx #$FF
|
||||
txs
|
||||
; Set up memory
|
||||
jsr initMem
|
||||
jsr setPlayerPos
|
||||
jsr loadFiles
|
||||
; Build all the unrolls and tables
|
||||
DEBUG_STR "Making tables."
|
||||
jsr makeBlit
|
||||
jsr makeClrBlit
|
||||
jsr makeDecodeTbls
|
||||
jsr makeLines
|
||||
jsr graphInit
|
||||
; Render the frame and flip it onto the screen
|
||||
@nextFrame:
|
||||
jsr renderFrame
|
||||
jsr flip
|
||||
; wait for a key
|
||||
DEBUG_STR "Done rendering, waiting for key."
|
||||
@pauseLup:
|
||||
lda kbd ; check for key
|
||||
bpl @pauseLup ; loop until one is pressed
|
||||
sta kbdStrobe ; eat the keypress
|
||||
and #$7F ; convert to low-bit ASCII because assembler uses that
|
||||
cmp #$60 ; lower-case?
|
||||
bcc :+ ; no
|
||||
sec
|
||||
sbc #$20 ; yes, convert to upper case
|
||||
; Dispatch the keypress
|
||||
: cmp #'W' ; 'W' for forward
|
||||
bne :+
|
||||
jsr moveForward
|
||||
jmp @nextFrame
|
||||
: cmp #'X' ; 'X' alternative for 'S'
|
||||
bne :+
|
||||
lda #'S'
|
||||
: cmp #'S' ; 'S' for backward
|
||||
bne :+
|
||||
jsr moveBackward
|
||||
jmp @nextFrame
|
||||
: cmp #'A' ; 'A' for left
|
||||
bne :+
|
||||
jsr rotateLeft
|
||||
jmp @nextFrame
|
||||
: cmp #'D' ; 'D' for right
|
||||
bne :+
|
||||
jsr rotateRight
|
||||
jmp @nextFrame
|
||||
: cmp #$1B ; ESC to exit
|
||||
beq @done
|
||||
jmp @pauseLup ; unrecognize key -- go back and get another one.
|
||||
@done:
|
||||
; back to text mode
|
||||
bit setText
|
||||
bit page1
|
||||
; quit to monitor
|
||||
; quit to monitor
|
||||
ldx #$FF
|
||||
txs
|
||||
jmp monitor
|
||||
|
||||
@expandName: .byte 10
|
||||
.byte "/LL/EXPAND"
|
||||
@tex0Name: .byte 21
|
||||
.byte "/LL/ASSETS/BUILDING01"
|
||||
@tex1name: .byte 21
|
||||
.byte "/LL/ASSETS/BUILDING02"
|
||||
@tex2name: .byte 21
|
||||
.byte "/LL/ASSETS/BUILDING03"
|
||||
@tex3name: .byte 21
|
||||
.byte "/LL/ASSETS/BUILDING04"
|
||||
@precastName: .byte 18
|
||||
.byte "/LL/ASSETS/PRECAST"
|
||||
@frameName: .byte 16
|
||||
.byte "/LL/ASSETS/FRAME"
|
||||
|
||||
; Map data temporarily encoded here. Soon we want to load this from a file instead.
|
||||
mapData:
|
||||
.byte 1,4,3,4,2,3,2,4,3,2,4,3,4,0,0,0
|
||||
.byte 1,0,0,0,0,0,0,3,0,0,2,0,3,0,0,0
|
||||
.byte 1,0,0,0,0,0,0,1,0,0,3,0,2,0,0,0
|
||||
.byte 3,0,0,1,2,3,0,4,0,0,4,0,3,0,0,0
|
||||
.byte 1,0,0,0,0,4,0,0,0,0,0,0,4,0,0,0
|
||||
.byte 2,0,0,2,0,2,0,0,0,0,0,0,4,0,0,0
|
||||
.byte 1,0,0,3,0,0,0,3,0,0,3,0,1,0,0,0
|
||||
.byte 3,0,0,1,0,0,0,3,0,0,2,0,3,0,0,0
|
||||
.byte 1,0,0,2,0,3,0,2,0,0,4,0,3,0,0,0
|
||||
.byte 1,0,0,0,0,2,0,0,0,0,0,0,1,0,0,0
|
||||
.byte 3,0,0,0,0,1,0,0,0,0,0,0,3,0,0,0
|
||||
.byte 1,0,0,4,0,4,0,3,1,2,4,0,2,0,0,0
|
||||
.byte 4,0,0,0,0,0,0,0,0,0,0,0,3,0,0,0
|
||||
.byte 1,2,3,3,3,2,2,1,2,4,2,2,2,0,0,0
|
||||
|
||||
; Following are log/pow lookup tables. For speed, align them on a page boundary.
|
||||
.align 256
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user