draw pattern on screen
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27bdb17513
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108d27c2b9
81
main.usm
81
main.usm
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@ -2,6 +2,8 @@
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( macros )
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%RTN { JMP2r } ( return from a subroutine )
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%LOB { SWP POP } ( get low byte of short as byte )
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%HIB { POP } ( get high byte of short as byte )
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( data structure access macros )
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%NOTE { NOP } ( get the note of a pattern line addr )
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@ -34,7 +36,8 @@
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|0000
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@State [ &position $2 &pattern-addr $2 &tick $1 &speed $1 ]
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@Playback [ &position $2 &pattern-addr $2 &tick $1 &speed $1 ]
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@Draw [ &row $1 &col $1 ]
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( program )
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@ -46,9 +49,9 @@
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#000f .System/b DEO2
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( speed - how many ticks we play a note every )
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#10 .State/speed POK
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#10 .Playback/speed POK
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;pattern .State/pattern-addr POK2
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;pattern .Playback/pattern-addr POK2
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( display/audio init )
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;on-frame .Screen/vector DEO2
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@ -58,21 +61,64 @@
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BRK
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@on-frame ( -> )
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.State/tick PEK .State/speed PEK NEQ ,&inc JNZ ( if the tick != speed, skip to inc )
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;draw JSR2
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.Playback/tick PEK .Playback/speed PEK NEQ ,&inc JNZ ( if the tick != speed, skip to inc )
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;on-step JSR2 ( otherwise, run the on-step routine )
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#00 .State/tick POK ( reset the tick )
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#00 .Playback/tick POK ( reset the tick )
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,&end JMP ( jump to end )
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&inc
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#01 .State/tick PEK ADD .State/tick POK ( tick up 1 )
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#01 .Playback/tick PEK ADD .Playback/tick POK ( tick up 1 )
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&end
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BRK
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@draw-nibble ( nibble )
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#08 MUL #00 SWP ;font_hex ADD2 .Screen/addr DEO2 ( locate nibble in the hex font )
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#21 .Screen/color DEO ( display it )
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.Screen/x DEI2 #0008 ADD2 .Screen/x DEO2 ( move right a sprite )
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RTN
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( draw-byte draws a byte as hex on the screen )
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@draw-byte ( byte )
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DUP #04 SFT ( high digit ) ;draw-nibble JSR2
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#0f AND ( low digit ) ;draw-nibble JSR2
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RTN
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( draw-pattern-line draws a single line in a pattern )
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@draw-pattern-line ( addr )
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#00 .Draw/col POK
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&loop
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DUP2 GET ;draw-byte JSR2
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.Screen/x DEI2 #0004 ADD2 .Screen/x DEO2 ( add spacing between digits )
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#0001 ADD2 ( get the next byte in the pattern )
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#01 .Draw/col PEK ADD .Draw/col POK
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.Draw/col PEK PTN_WIDTH LOB NEQ ,&loop JNZ
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POP2 ( remove final address from stack )
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RTN
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( draw-pattern draws a pattern )
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@draw-pattern ( addr )
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#00 .Draw/row POK
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&loop
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#0010 .Screen/x DEO2
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DUP2 ;draw-pattern-line JSR2
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.Screen/y DEI2 #000b ADD2 .Screen/y DEO2 ( add spacing between rows )
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PTN_WIDTH ADD2 ( get the next byte in the pattern )
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#01 .Draw/row PEK ADD .Draw/row POK
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.Draw/row PEK PTN_LEN LOB NEQ ,&loop JNZ
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POP2 ( remove final address from stack )
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RTN
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@draw
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#0010 .Screen/x DEO2
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#0010 .Screen/y DEO2
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.Playback/pattern-addr PEK2 ;draw-pattern JSR2
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RTN
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@on-step ( whenever a pattern step should be played )
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PTN_WIDTH PTN_LEN MUL2 .State/position PEK2 NEQ2 ,&continue JNZ ( if we're at the end of the pattern, reset the counter )
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#ff .Console/byte DEO
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#0000 .State/position POK2
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PTN_WIDTH PTN_LEN MUL2 .Playback/position PEK2 NEQ2 ,&continue JNZ ( if we're at the end of the pattern, reset the counter )
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#0000 .Playback/position POK2
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&continue
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.State/position PEK2 .State/pattern-addr PEK2 ADD2 ( put pattern line address on the stack )
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.Playback/position PEK2 .Playback/pattern-addr PEK2 ADD2 ( put pattern line address on the stack )
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DUP2 VOL GET .Audio0/volume DEO ( ln -- ) ( put the address of the pattern line on the stack )
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NOTE GET ( get the current note )
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DUP #00 EQU ,&rest JNZ ( if the note is 00, aka empty, skip playing it )
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@ -81,16 +127,27 @@ BRK
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&rest POP ( if the note is a 00, jump here. POP to clean up the stack )
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&end
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PTN_WIDTH .State/position PEK2 ADD2 .State/position POK2
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PTN_WIDTH .Playback/position PEK2 ADD2 .Playback/position POK2
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RTN
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@wave [ a8 58 ]
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@font_hex ( 0-F )
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[
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003c 464a 5262 3c00 0018 0808 0808 1c00
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003c 4202 3c40 7e00 003c 421c 0242 3c00
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000c 1424 447e 0400 007e 407c 0242 3c00
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003c 407c 4242 3c00 007e 0204 0810 1000
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003c 423c 4242 3c00 003c 4242 3e02 3c00
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003c 4242 7e42 4200 007c 427c 4242 7c00
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003c 4240 4042 3c00 007c 4242 4242 7c00
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007e 4078 4040 7e00 007e 4078 4040 4000
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]
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( pattern format - each note has 3 bytes. Pitch, instrument, volume. patterns are 0x10 long.
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an ff in the note column of the pattern will kill the existing note without starting a new one (this is the tracker "box" note) )
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@pattern [
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3c 00 66
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ff 00 66
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