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sh2_mixer.s
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sh2_mixer.s
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! The MIT License (MIT)
!
! Permission is hereby granted, free of charge, to any person obtaining a copy
! of this software and associated documentation files (the "Software"), to deal
! in the Software without restriction, including without limitation the rights
! to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! copies of the Software, and to permit persons to whom the Software is
! furnished to do so, subject to the following conditions:
!
! The above copyright notice and this permission notice shall be included in all
! copies or substantial portions of the Software.
!
! THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
! SOFTWARE.
.section .sdata
! void S_PaintChannel8(void *channel, int16_t *buffer, int32_t cnt, int32_t scale);
! On entry: r4 = channel pointer
! r5 = buffer pointer
! r6 = count (number of stereo 16-bit samples)
! r7 = scale (global volume - possibly fading, 0 - 64)
.align 4
.global _S_PaintChannel8
_S_PaintChannel8:
mov.l r8,@-r15
mov.l r9,@-r15
mov.l r10,@-r15
mov.l r11,@-r15
mov.l r12,@-r15
mov.l r13,@-r15
mov.l r14,@-r15
mov.l @r4,r8 /* data pointer */
mov.l @(4,r4),r9 /* position */
mov.l @(8,r4),r10 /* increment */
mov.l @(12,r4),r11 /* length */
mov.l @(16,r4),r12 /* loop_length */
mov.w @(24,r4),r0 /* volume:pan */
/* calculate left/right volumes from volume, pan, and scale */
swap.b r0,r13
extu.b r13,r13 /* ch_vol */
extu.b r0,r0 /* pan */
/* LINEAR_CROSSFADE */
mulu.w r7,r13
mov #0xFF,r1
extu.b r1,r1
sub r0,r1 /* 255 - pan */
sts macl,r7 /* ch_vol * scale */
mulu.w r0,r7
/* process one sample -- begin */
mov r9,r0
shlr8 r0
shll2 r0
shlr8 r0
sts macl,r14 /* pan * ch_vol * scale */
mov.b @(r0,r8),r0
mulu.w r1,r7
shlr8 r14
! shlr2 r14
shlr2 r14 /* right volume = pan * ch_vol * scale / 64 / 64 */
sts macl,r13 /* (255 - pan) * ch_vol * scale */
shlr8 r13
! shlr2 r13
shlr2 r13 /* left volume = (255 - pan) * ch_vol * scale / 64 / 64 */
/* mix r6 stereo samples */
.p2alignw 2, 0x0009
mix_loop:
mov.l @r5,r1
/* process one sample -- cont */
extu.b r0,r3
add #-128,r3
shll8 r3
/* scale sample for left output */
muls.w r3,r13
add r10,r9 /* position += increment */
sts macl,r0
/* scale sample for right output */
muls.w r3,r14
/* scale sample for left output -- cont */
shlr16 r0
shll16 r0
add r0,r1
/* scale sample for right output -- cont */
sts macl,r0
shlr16 r0
add r0,r1
/* advance position and check for loop */
mov.l r1,@r5
add #4,r5
mix_chk:
cmp/hs r11,r9
bt/s mix_wrap /* position >= length */
mix_next:
/* next sample */
/* process one sample -- begin */
mov r9,r0
shlr8 r0
shll2 r0
shlr8 r0
mov.b @(r0,r8),r0
dt r6
bf mix_loop
bra mix_exit
nop
mix_wrap:
/* check if loop sample */
mov r12,r0
cmp/eq #0,r0
bf/s mix_chk /* loop sample */
sub r12,r9 /* position -= loop_length */
/* sample done playing */
mix_exit:
mov.l r9,@(4,r4) /* update position field */
mov.l @r15+,r14
mov.l @r15+,r13
mov.l @r15+,r12
mov.l @r15+,r11
mov.l @r15+,r10
mov.l @r15+,r9
mov.l @r15+,r8
rts
nop
! void S_PaintChannel4IMA(void *channel, int16_t *buffer, int32_t cnt, int32_t scale);
! On entry: r4 = channel pointer
! r5 = buffer pointer
! r6 = count (number of stereo 16-bit samples / 2)
! r7 = scale (global volume - possibly fading, 0 - 64)
.align 4
.global _S_PaintChannel4IMA
_S_PaintChannel4IMA:
mov.l r8,@-r15
mov.l r9,@-r15
mov.l r10,@-r15
mov.l r11,@-r15
mov.l r12,@-r15
mov.l r13,@-r15
mov.l r14,@-r15
mov.l @r4,r8 /* data pointer */
mov.l @(4,r4),r9 /* position */
mov.l @(8,r4),r10 /* increment (should be <= 1.0 for adpcm) */
mov.l @(12,r4),r11 /* length */
mov.l @(16,r4),r12 /* step_index:predictor */
mov.w @(24,r4),r0 /* volume:pan */
mov r12,r2 /* save step_index */
shlr16 r2
/* calculate left/right volumes from volume, pan, and scale */
swap.b r0,r13
extu.b r13,r13 /* ch_vol */
extu.b r0,r0 /* pan */
/* LINEAR_CROSSFADE */
mulu.w r7,r13
mov #0xFF,r1
extu.b r1,r1
sub r0,r1 /* 255 - pan */
sts macl,r7 /* ch_vol * scale */
mulu.w r0,r7
mov.l @(20,r4),r0 /* prev_pos */
sts macl,r14 /* pan * ch_vol * scale */
mulu.w r1,r7
shlr8 r14
! shlr2 r14
shlr2 r14 /* right volume = pan * ch_vol * scale / 64 / 64 */
sts macl,r13 /* (255 - pan) * ch_vol * scale */
shlr8 r13
! shlr2 r13
shlr2 r13 /* left volume = (255 - pan) * ch_vol * scale / 64 / 64 */
cmp/eq #-1,r0
bf/s mix4_loop
mov r0,r7
bra mix4_gets
mov #1,r7
/* mix r6 stereo samples */
.p2alignw 2, 0x0009
mix4_loop:
/* process one sample */
mov.l _step_table,r1
mov r2,r0
mov.w @(r0,r1),r1 /* step = step_table[step_index] */
mov r9,r0
shlr8 r0
shll2 r0
shlr8 r0 /* sample position in nibbles */
cmp/eq r0,r7 /* prev_pos */
bt/s mix4_gets /* haven't advanced a sample yet */
mov r0,r7 /* update prev_pos and calculate new adpcm sample */
shlr r0 /* one more because samples are nibbles, T set if msn */
bf/s 0f /* T not set, lsn */
mov.b @(r0,r8),r0
shlr2 r0
shlr2 r0
0:
tst #8,r0 /* (nibble & 8) */
and #0x07,r0 /* nibble &= 7 */
/* diff = (2 * nibble + 1) * step / 8 */
mov r0,r3
add r3,r3 /* 2 * nibble */
add #1,r3
muls.w r1,r3
exts.w r12,r12 /* 32-bit predictor */
mov #-128,r1
sts macl,r3 /* diff */
/* if (nibble & 8) step = -step */
bt/s 1f
shar r3 /* diff / 2 */
neg r3,r3
1:
shar r3 /* diff / 4 */
shar r3 /* diff / 8 */
add r3,r12 /* predictor += diff */
/* clamp to -32768:32767 */
shll8 r1
cmp/ge r1,r12
bf/s 2f /* sample < -32768 */
not r1,r1
cmp/gt r1,r12
bt/s 3f /* sample > 32767 */
4:
/* step_index += index_table[nibble] */
mov.l _index_table,r1
shll2 r2 /* index *= 4 */
add r2,r0
mov.b @(r0,r1),r2
.p2alignw 2, 0x0009
mix4_gets:
/* get sample */
/* scale sample for left output */
muls.w r12,r13
mov.l @r5,r1
add r10,r9 /* position += increment */
sts macl,r0
/* scale sample for right output */
muls.w r12,r14
/* scale sample for left output -- cont */
shlr16 r0
shll16 r0
mov r0,r3
/* scale sample for right output -- cont */
sts macl,r0
shlr16 r0
add r0,r3
/* write left and right output */
add r3,r1
cmp/hs r11,r9
mov.l r1,@r5
extu.b r2,r2 /* index = (uint8_t)index */
/* advance position */
bt/s mix4_exit /* position >= length */
/* next sample */
dt r6
bf/s mix4_loop
add #4,r5
/* not done with the whole file, so update step_index : predictor */
extu.w r12,r12 /* clear upper word for step_index */
shll16 r2
or r2,r12 /* r12 is step_index : predictor again */
mov.l r12,@(16,r4) /* update step_index : predictor */
mix4_exit:
mov.l r7,@(20,r4)
mov.l r9,@(4,r4) /* update position field */
mov.l @r15+,r14
mov.l @r15+,r13
mov.l @r15+,r12
mov.l @r15+,r11
mov.l @r15+,r10
mov.l @r15+,r9
mov.l @r15+,r8
rts
mov r6,r0
2:
not r1,r1
bra 4b
mov r1,r12 /* clamp sample to -32768 */
3:
bra 4b
mov r1,r12 /* clamp sample to 32767 */
bra mix4_gets
nop
! void S_PaintChannel4IMA2x(void *channel, int16_t *buffer, int32_t cnt, int32_t scale);
! On entry: r4 = channel pointer
! r5 = buffer pointer
! r6 = count (number of stereo 16-bit samples / 2)
! r7 = scale (global volume - possibly fading, 0 - 64)
.align 4
.global _S_PaintChannel4IMA2x
_S_PaintChannel4IMA2x:
mov.l r8,@-r15
mov.l r9,@-r15
mov.l r10,@-r15
mov.l r11,@-r15
mov.l r12,@-r15
mov.l r13,@-r15
mov.l r14,@-r15
mov.l @r4,r8 /* data pointer */
mov.l @(4,r4),r9 /* position */
mov.l @(8,r4),r10 /* increment (should be <= 1.0 for adpcm) */
mov.l @(12,r4),r11 /* length */
mov.l @(16,r4),r12 /* step_index:predictor */
mov.w @(24,r4),r0 /* volume:pan */
mov r12,r2 /* save step_index */
shlr16 r2
add r10,r10 /* increment *= 2 */
/* calculate left/right volumes from volume, pan, and scale */
swap.b r0,r13
extu.b r13,r13 /* ch_vol */
extu.b r0,r0 /* pan */
/* LINEAR_CROSSFADE */
mulu.w r7,r13
mov #0xFF,r1
extu.b r1,r1
sub r0,r1 /* 255 - pan */
sts macl,r7 /* ch_vol * scale */
mulu.w r0,r7
mov.l @(20,r4),r0 /* prev_pos */
sts macl,r14 /* pan * ch_vol * scale */
mulu.w r1,r7
shlr8 r14
! shlr2 r14
shlr2 r14 /* right volume = pan * ch_vol * scale / 64 / 64 */
sts macl,r13 /* (255 - pan) * ch_vol * scale */
shlr8 r13
! shlr2 r13
shlr2 r13 /* left volume = (255 - pan) * ch_vol * scale / 64 / 64 */
cmp/eq #-1,r0
bf/s mix4_loop2x
mov r0,r7
bra mix4_gets2x
mov #1,r7
/* mix r6 stereo samples */
.p2alignw 2, 0x0009
mix4_loop2x:
/* process one sample */
mov.l _step_table,r1
mov r2,r0 /* step_index */
mov.w @(r0,r1),r1 /* step = step_table[step_index] */
mov r9,r0
shlr8 r0
shll2 r0
shlr8 r0 /* sample position in nibbles */
cmp/eq r0,r7 /* prev_pos */
bt/s mix4_gets2x /* haven't advanced a sample yet */
mov r0,r7 /* update prev_pos and calculate new adpcm sample */
shlr r0 /* one more because samples are nibbles, T set if msn */
bf/s 0f /* T not set, lsn */
mov.b @(r0,r8),r0
shlr2 r0
shlr2 r0
0:
tst #8,r0 /* (nibble & 8) */
and #0x07,r0 /* nibble &= 7 */
/* diff = (2 * nibble + 1) * step / 8 */
mov r0,r3
add r3,r3 /* 2 * nibble */
add #1,r3
muls.w r1,r3
exts.w r12,r12 /* 32-bit predictor */
mov #-128,r1
sts macl,r3 /* diff */
/* if (nibble & 8) step = -step */
bt/s 1f
shar r3 /* diff / 2 */
neg r3,r3
1:
shar r3 /* diff / 4 */
shar r3 /* diff / 8 */
add r3,r12 /* predictor += diff */
/* clamp to -32768:32767 */
shll8 r1
cmp/ge r1,r12
bf/s 2f /* sample < -32768 */
not r1,r1
cmp/gt r1,r12
bt/s 3f /* sample > 32767 */
4:
/* step_index += index_table[nibble] */
mov.l _index_table,r1
shll2 r2 /* index *= 4 */
add r2,r0
mov.b @(r0,r1),r2
.p2alignw 2, 0x0009
mix4_gets2x:
/* get sample */
/* scale sample for left output */
muls.w r12,r13
mov.l @r5,r1
dt r6
add r10,r9 /* position += increment */
sts macl,r0
/* scale sample for right output */
muls.w r12,r14
/* scale sample for left output -- cont */
shlr16 r0
shll16 r0
mov r0,r3
/* scale sample for right output -- cont */
sts macl,r0
shlr16 r0
add r0,r3
/* write left and right output */
add r3,r1
mov.l r1,@r5
mov.l @(4,r5),r1
cmp/hs r11,r9
add r3,r1
mov.l r1,@(4,r5)
extu.b r2,r2 /* index = (uint8_t)index */
/* advance position */
bt/s mix4_exit2x /* position >= length */
/* next sample */
dt r6
bf/s mix4_loop2x
add #8,r5
/* not done with the whole file, so update step_index : predictor */
extu.w r12,r12 /* clear upper word for step_index */
shll16 r2
or r2,r12 /* r12 is step_index : predictor again */
mov.l r12,@(16,r4) /* update step_index : predictor */
mix4_exit2x:
mov.l r7,@(20,r4)
mov.l r9,@(4,r4) /* update position field */
mov.l @r15+,r14
mov.l @r15+,r13
mov.l @r15+,r12
mov.l @r15+,r11
mov.l @r15+,r10
mov.l @r15+,r9
mov.l @r15+,r8
rts
mov r6,r0
2:
not r1,r1
bra 4b
mov r1,r12 /* clamp sample to -32768 */
3:
bra 4b
mov r1,r12 /* clamp sample to 32767 */
bra mix4_gets2x
nop
.align 4
_step_table:
.long step_table
_index_table:
.long index_table
step_table:
.word 7, 8, 9, 10, 11, 12, 13, 14
.word 16, 17, 19, 21, 23, 25, 28, 31
.word 34, 37, 41, 45, 50, 55, 60, 66
.word 73, 80, 88, 97, 107, 118, 130, 143
.word 157, 173, 190, 209, 230, 253, 279, 307
.word 337, 371, 408, 449, 494, 544, 598, 658
.word 724, 796, 876, 963, 1060, 1166, 1282, 1411
.word 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024
.word 3327, 3660, 4026, 4428, 4871, 5358, 5894, 6484
.word 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899
.word 15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794
.word 32767
.text
.global index_table
index_table:
.byte 0, 0, 0, 0, 4, 8, 12, 16
.byte 0, 0, 0, 0, 6, 10, 14, 18
.byte 2, 2, 2, 2, 8, 12, 16, 20
.byte 4, 4, 4, 4, 10, 14, 18, 22
.byte 6, 6, 6, 6, 12, 16, 20, 24
.byte 8, 8, 8, 8, 14, 18, 22, 26
.byte 10, 10, 10, 10, 16, 20, 24, 28
.byte 12, 12, 12, 12, 18, 22, 26, 30
.byte 14, 14, 14, 14, 20, 24, 28, 32
.byte 16, 16, 16, 16, 22, 26, 30, 34
.byte 18, 18, 18, 18, 24, 28, 32, 36
.byte 20, 20, 20, 20, 26, 30, 34, 38
.byte 22, 22, 22, 22, 28, 32, 36, 40
.byte 24, 24, 24, 24, 30, 34, 38, 42
.byte 26, 26, 26, 26, 32, 36, 40, 44
.byte 28, 28, 28, 28, 34, 38, 42, 46
.byte 30, 30, 30, 30, 36, 40, 44, 48
.byte 32, 32, 32, 32, 38, 42, 46, 50
.byte 34, 34, 34, 34, 40, 44, 48, 52
.byte 36, 36, 36, 36, 42, 46, 50, 54
.byte 38, 38, 38, 38, 44, 48, 52, 56
.byte 40, 40, 40, 40, 46, 50, 54, 58
.byte 42, 42, 42, 42, 48, 52, 56, 60
.byte 44, 44, 44, 44, 50, 54, 58, 62
.byte 46, 46, 46, 46, 52, 56, 60, 64
.byte 48, 48, 48, 48, 54, 58, 62, 66
.byte 50, 50, 50, 50, 56, 60, 64, 68
.byte 52, 52, 52, 52, 58, 62, 66, 70
.byte 54, 54, 54, 54, 60, 64, 68, 72
.byte 56, 56, 56, 56, 62, 66, 70, 74
.byte 58, 58, 58, 58, 64, 68, 72, 76
.byte 60, 60, 60, 60, 66, 70, 74, 78
.byte 62, 62, 62, 62, 68, 72, 76, 80
.byte 64, 64, 64, 64, 70, 74, 78, 82
.byte 66, 66, 66, 66, 72, 76, 80, 84
.byte 68, 68, 68, 68, 74, 78, 82, 86
.byte 70, 70, 70, 70, 76, 80, 84, 88
.byte 72, 72, 72, 72, 78, 82, 86, 90
.byte 74, 74, 74, 74, 80, 84, 88, 92
.byte 76, 76, 76, 76, 82, 86, 90, 94
.byte 78, 78, 78, 78, 84, 88, 92, 96
.byte 80, 80, 80, 80, 86, 90, 94, 98
.byte 82, 82, 82, 82, 88, 92, 96, 100
.byte 84, 84, 84, 84, 90, 94, 98, 102
.byte 86, 86, 86, 86, 92, 96, 100, 104
.byte 88, 88, 88, 88, 94, 98, 102, 106
.byte 90, 90, 90, 90, 96, 100, 104, 108
.byte 92, 92, 92, 92, 98, 102, 106, 110
.byte 94, 94, 94, 94, 100, 104, 108, 112
.byte 96, 96, 96, 96, 102, 106, 110, 114
.byte 98, 98, 98, 98, 104, 108, 112, 116
.byte 100, 100, 100, 100, 106, 110, 114, 118
.byte 102, 102, 102, 102, 108, 112, 116, 120
.byte 104, 104, 104, 104, 110, 114, 118, 122
.byte 106, 106, 106, 106, 112, 116, 120, 124
.byte 108, 108, 108, 108, 114, 118, 122, 126
.byte 110, 110, 110, 110, 116, 120, 124, 128
.byte 112, 112, 112, 112, 118, 122, 126, 130
.byte 114, 114, 114, 114, 120, 124, 128, 132
.byte 116, 116, 116, 116, 122, 126, 130, 134
.byte 118, 118, 118, 118, 124, 128, 132, 136
.byte 120, 120, 120, 120, 126, 130, 134, 138
.byte 122, 122, 122, 122, 128, 132, 136, 140
.byte 124, 124, 124, 124, 130, 134, 138, 142
.byte 126, 126, 126, 126, 132, 136, 140, 144
.byte 128, 128, 128, 128, 134, 138, 142, 146
.byte 130, 130, 130, 130, 136, 140, 144, 148
.byte 132, 132, 132, 132, 138, 142, 146, 150
.byte 134, 134, 134, 134, 140, 144, 148, 152
.byte 136, 136, 136, 136, 142, 146, 150, 154
.byte 138, 138, 138, 138, 144, 148, 152, 156
.byte 140, 140, 140, 140, 146, 150, 154, 158
.byte 142, 142, 142, 142, 148, 152, 156, 160
.byte 144, 144, 144, 144, 150, 154, 158, 162
.byte 146, 146, 146, 146, 152, 156, 160, 164
.byte 148, 148, 148, 148, 154, 158, 162, 166
.byte 150, 150, 150, 150, 156, 160, 164, 168
.byte 152, 152, 152, 152, 158, 162, 166, 170
.byte 154, 154, 154, 154, 160, 164, 168, 172
.byte 156, 156, 156, 156, 162, 166, 170, 174
.byte 158, 158, 158, 158, 164, 168, 172, 176
.byte 160, 160, 160, 160, 166, 170, 174, 176
.byte 162, 162, 162, 162, 168, 172, 176, 176
.byte 164, 164, 164, 164, 170, 174, 176, 176
.byte 166, 166, 166, 166, 172, 176, 176, 176
.byte 168, 168, 168, 168, 174, 176, 176, 176
.byte 170, 170, 170, 170, 176, 176, 176, 176
.byte 172, 172, 172, 172, 176, 176, 176, 176
.byte 174, 174, 174, 174, 176, 176, 176, 176