371 lines
16 KiB
OpenEdge ABL
371 lines
16 KiB
OpenEdge ABL
midiId EQU register0
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audioAddr EQU register1
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waveType EQU register2
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midiNote EQU register4 ; register4 to register7 are the only free registers during time slicing
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midiCommand EQU register5
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midiPtr EQU register6
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sndChannel EQU register8
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sndFrequency EQU register9
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sndVolume EQU register10
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sndWaveType EQU register11
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musicStream EQU register8
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musicNote EQU register9
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musicCommand EQU register10
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musicPtr EQU register11
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%SUB setMidiStream
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setMidiStream LDWI _midisLut_
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ADDW midiId
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ADDW midiId
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DEEK
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RET
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%ENDS
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%SUB resetMidi
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; adds 10*16.66667ms delay between giga_frameCount and midiDelay so that if there ; is substantial processing between resetMidi and playMidi giga_frameCount will
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; not overflow past midiDelay and cause an extra initial 256*16.66667ms delay
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resetMidi LDI 0
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ST giga_frameCount
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ADDI 10
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STW midiDelay ; instant MIDI startup
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LDI giga_soundChan1 >>8
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ST audioAddr + 1
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LDI 0
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ST waveType ; wavA, (wavX is initialised by Macros)
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resetMi_loop LDI giga_soundChan1
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ST audioAddr ; reset low byte
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LDW waveType
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DOKE audioAddr ; wavA and wavX
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INC audioAddr
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INC audioAddr
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LDI 0
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DOKE audioAddr ; keyL and keyH
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INC audioAddr + 1 ; increment high byte
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LD audioAddr + 1
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SUBI 4
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BLE resetMi_loop
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RET
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%ENDS
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%SUB playMidi
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playMidi LDW midiStream
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BEQ playM_exit0 ; 0x0000 = stop
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LDI 5 ; keep pumping soundTimer
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ST giga_soundTimer
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LD giga_frameCount
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SUBW midiDelay
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BEQ playM_start
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playM_exit0 RET
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playM_start PUSH
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playM_process LDW midiStream
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PEEK ; get midi stream byte
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STW midiCommand
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LDW midiStream
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ADDI 0x01
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STW midiStream
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LDW midiCommand
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ANDI 0xF0
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XORI 0x90 ; check for start note
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BNE playM_endnote
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LDWI midiStartNote
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CALL giga_vAC ; start note
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BRA playM_process
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playM_endnote XORI 0x10 ; check for end note
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BNE playM_segment
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LDWI midiEndNote ; end note
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CALL giga_vAC
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BRA playM_process
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playM_segment XORI 0x50 ; check for new segment
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BNE playM_delay
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LDW midiStream ; midi score
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DEEK
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STW midiStream ; 0xD0 new midi segment address
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BEQ playM_exit1 ; 0x0000 = stop
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BRA playM_process
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playM_delay LD giga_frameCount ; midiDelay = (midiCommand + peek(frameCount)) & 0x00FF
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ADDW midiCommand
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ST midiDelay
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playM_exit1 POP
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RET
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%ENDS
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%SUB playMidiVol
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playMidiVol LDW midiStream
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BEQ playMV_exit0 ; 0x0000 = stop
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LDI 5 ; keep pumping soundTimer
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ST giga_soundTimer
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LD giga_frameCount
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SUBW midiDelay
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BEQ playMV_start
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playMV_exit0 RET
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playMV_start PUSH
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playMV_process LDW midiStream
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PEEK ; get midi stream byte
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STW midiCommand
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LDW midiStream
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ADDI 0x01
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STW midiStream
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LDW midiCommand
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ANDI 0xF0
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XORI 0x90 ; check for start note
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BNE playMV_endnote
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LDWI midiStartNote
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CALL giga_vAC ; start note
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LDWI midiSetVolume
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CALL giga_vAC ; set note volume
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BRA playMV_process
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playMV_endnote XORI 0x10 ; check for end note
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BNE playMV_segment
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LDWI midiEndNote ; end note
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CALL giga_vAC
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BRA playMV_process
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playMV_segment XORI 0x50 ; check for new segment
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BNE playMV_delay
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LDW midiStream ; midi score
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DEEK
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STW midiStream ; 0xD0 new midi segment address
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BEQ playMV_exit1 ; 0x0000 = stop
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BRA playMV_process
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playMV_delay LD giga_frameCount ; midiDelay = (midiCommand + peek(frameCount)) & 0x00FF
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ADDW midiCommand
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ST midiDelay
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playMV_exit1 POP
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RET
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%ENDS
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%SUB midiStartNote
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midiStartNote LDWI giga_notesTable - 22 ; giga_notesTable + (midi - 11)*2
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STW midiPtr
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LDW midiStream ; midi note
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PEEK
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LSLW
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ADDW midiPtr
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STW midiPtr
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LUP 0x00 ; get ROM midi note low byte
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ST midiNote
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LDW midiPtr
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LUP 0x01 ; get ROM midi note high byte
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ST midiNote + 1
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LDW midiCommand
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ANDI 0x03 ; get channel
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ADDI 0x01
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ST midiPtr + 1
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LDI 0xFC
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ST midiPtr ; note address 0x01FC <-> 0x04FC
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LDW midiNote
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DOKE midiPtr ; set note
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midiSN_exit LDW midiStream
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ADDI 0x01 ; midiStream++
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STW midiStream
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RET
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midiSetVolume LDI 0xFA
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ST midiPtr ; wavA address 0x01FA <-> 0x04FA, (midiPtr is still valid from midiStartNote)
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LDW midiStream ; midi volume
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PEEK
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POKE midiPtr
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BRA midiSN_exit ; save a few bytes by using midiStartNote's epilogue
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midiEndNote LDW midiCommand
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ANDI 0x03 ; get channel
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ADDI 0x01
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ST midiPtr + 1
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LDI 0xFC
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ST midiPtr ; channels address 0x01FC <-> 0x04FC
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LDI 0
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DOKE midiPtr ; end note
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RET
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%ENDS
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%SUB midiGetNote
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midiGetNote LDWI giga_notesTable - 22 ; giga_notesTable + (midi - 11)*2
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STW musicPtr
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LD musicNote
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LSLW
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ADDW musicPtr
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STW musicPtr
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LUP 0x00 ; get ROM note low byte
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;LSLW ; left shift low byte as SOUND command expects
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ST musicNote ; a non system internal frequency
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LDW musicPtr
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LUP 0x01 ; get ROM note high byte
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ST musicNote + 1
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LDW musicNote ; this is needed for GET("MIDI_NOTE")
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RET
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%ENDS
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%SUB resetMusic
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resetMusic LDI giga_soundChan1 >>8
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ST audioAddr + 1
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LDI 0
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ST waveType ; wavA, (wavX is initialised by Macros)
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resetMu_loop LDI giga_soundChan1
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ST audioAddr ; reset low byte
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LDW waveType
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DOKE audioAddr ; wavA and wavX
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INC audioAddr
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INC audioAddr
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LDI 0
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DOKE audioAddr ; keyL and keyH
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INC audioAddr + 1 ; increment high byte
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LD audioAddr + 1
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SUBI 4
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BLE resetMu_loop
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RET
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%ENDS
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%SUB playMusic
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playMusic PUSH
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playN_process LDW musicStream
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INC musicStream
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PEEK ; get music stream byte
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STW musicCommand
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ANDI 0xF0
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XORI 0x90 ; check for start note
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BNE playN_endnote
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LDW musicStream
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INC musicStream
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PEEK ; get music note
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ST musicNote
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LDWI midiGetNote
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CALL giga_vAC ; start note
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LDWI musicPlayNote
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CALL giga_vAC
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BRA playN_process
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playN_endnote XORI 0x10 ; check for end note
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BNE playN_segment
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LDI 0
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STW musicNote
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LDWI musicPlayNote ; end note
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CALL giga_vAC
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BRA playN_process
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playN_segment XORI 0x50 ; check for new segment
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BNE playN_delay
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LDW musicStream ; music stream
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DEEK
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STW musicStream ; 0xD0 new music segment address
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BNE playN_process ; 0x0000 = stop
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POP
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RET
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playN_delay LDW musicCommand
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ST giga_soundTimer ; keep pumping soundTimer
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STW waitVBlankNum
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LDWI waitVBlanks
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CALL giga_vAC
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BRA playN_process
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%ENDS
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%SUB musicGetNote
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musicGetNote LDWI giga_notesTable
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ADDW musicNote
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ADDW musicNote
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STW musicPtr
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LUP 0x00 ; get ROM note low byte
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ST musicNote
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LDW musicPtr
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LUP 0x01 ; get ROM note high byte
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ST musicNote + 1
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LDW musicNote ; this is needed for GET("MUSIC_NOTE")
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RET
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%ENDS
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%SUB musicPlayNote
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musicPlayNote LDW musicCommand
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ANDI 0x03 ; get channel
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ADDI 0x01
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ST musicPtr + 1
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LDI 0xFC
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ST musicPtr ; note address 0x01FC <-> 0x04FC
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LDW musicNote
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DOKE musicPtr ; set note
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RET
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%ENDS
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%SUB soundAllOff
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soundAllOff LDWI 0x01FC
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STW sndChannel
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LDI 0
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DOKE sndChannel ; turn off channel 0
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INC sndChannel + 1
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DOKE sndChannel ; turn off channel 1
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INC sndChannel + 1
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DOKE sndChannel ; turn off channel 2
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INC sndChannel + 1
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DOKE sndChannel ; turn off channel 3
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RET
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%ENDS
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%SUB soundOff
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soundOff LDI 0xFC
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ST sndChannel
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LDI 0
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DOKE sndChannel ; turn off channel
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RET
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%ENDS
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%SUB soundOn
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soundOn LDWI SYS_LSRW1_48
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STW giga_sysFn
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LDI 0xFC
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ST sndChannel
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LD sndFrequency
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SYS 48
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ST sndFrequency ; right shift low byte of sndFrequency by 1
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LDW sndFrequency ; format = high:8 low:07, (bit 7 of low byte = 0)
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DOKE sndChannel ; turn on channel
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RET
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%ENDS
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%SUB soundOnV
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soundOnV LDWI SYS_LSRW1_48
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STW giga_sysFn
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LDI 0xFC
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ST sndChannel
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LD sndFrequency
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SYS 48
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ST sndFrequency ; right shift low byte of sndFrequency by 1
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LDW sndFrequency ; format = high:8 low:07, (bit 7 of low byte = 0)
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DOKE sndChannel ; turn on channel
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LDI 0xFA
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ST sndChannel ; still pointing to the correct channel
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LDI 63
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SUBW sndVolume
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ADDI 64
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POKE sndChannel ; 0 -> 63 maps to 127 -> 64
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INC sndChannel
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LD sndWaveType
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ANDI 3
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POKE sndChannel ; wave type in wave X
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RET
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%ENDS
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%SUB soundMod
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soundMod LDI 0xFA
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ST sndChannel
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LDW sndWaveType ; format = high:waveX low:waveA
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DOKE sndChannel ; set modulation
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RET
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%ENDS
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