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VSU works now

This commit is contained in:
Guy Perfect 2024-10-21 19:39:35 -05:00
parent 0a57ef0faf
commit c06da32321
4 changed files with 87 additions and 58 deletions
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5
core/vb.c
View File

@ -64,8 +64,7 @@ typedef struct {
} wave;
/* Other state */
uint32_t clocks; /* Clocks until next sample */
uint16_t output[2]; /* Current output sample */
uint32_t clocks; /* Clocks until next sample */
} Channel;
/* Simulation state */
@ -297,7 +296,7 @@ struct VB {
float o1[2]; /* Previous analog output sample */
uint32_t capacity; /* Number of audio frames in samples */
uint32_t offset; /* Position in output buffer */
int16_t *samples; /* Output memory */
int16_t *samples; /* Output memory */
} out;
/* Memory */

16
core/vip.c
View File

@ -40,6 +40,18 @@ static const uint8_t BG_TEMPLATES[][64] = {
6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7 }
};
/* 8-bit color magnitude by brightness level */
static const uint8_t BRIGHT8[] = {
0, 10, 16, 21, 25, 30, 33, 37, 40, 44, 47, 50, 53, 56, 59, 61,
64, 67, 69, 72, 74, 77, 79, 82, 84, 86, 89, 91, 93, 95, 97,100,
102,104,106,108,110,112,114,116,118,120,122,124,126,128,130,131,
133,135,137,139,141,142,144,146,148,149,151,153,155,156,158,160,
161,163,165,166,168,170,171,173,175,176,178,179,181,183,184,186,
187,189,190,192,194,195,197,198,200,201,203,204,206,207,209,210,
212,213,215,216,217,219,220,222,223,225,226,227,229,230,232,233,
235,236,237,239,240,241,243,244,246,247,248,250,251,252,254,255
};
/***************************** Module Functions ******************************/
@ -392,9 +404,9 @@ static void vipComputeBrightness(VB *sim) {
brt[2] = repeat * sim->vip.brtRest[1];
brt[3] = repeat * sim->vip.brtRest[2] + brt[2] + brt[1];
/* Scale brightness values to 0..255 */
/* Transform brightness values to 0..255 */
for (x = 1; x < 4; x++)
sim->vip.dp.brt[x] = ((brt[x] > 127 ? 127 : brt[x]) * 510 + 127) / 254;
sim->vip.dp.brt[x] = brt[x] > 127 ? 255 : BRIGHT8[brt[x]];
}
/* Transfer one column of frame buffer pixels to output */

116
core/vsu.c
View File

@ -5,7 +5,7 @@
/********************************* Constants *********************************/
/* Analog output low-pass filter coefficient = 0.022 / (0.022 + 1 / 41700) */
/* Analog output high-pass filter coefficient = 0.022 / (0.022 + 1 / 41700) */
#define RC_A (float) (1 - 1 / 918.4)
@ -39,7 +39,7 @@ static void vsuOnSamples(VB *sim) {
if (sim->onSamples != NULL)
VB_ON_SAMPLES(sim, sim->vsu.out.samples, sim->vsu.out.capacity);
}
#undef VB_ON_EXCEPTION
#undef VB_ON_SAMPLES
@ -78,29 +78,11 @@ static void vsuEmulateChannel(VB *sim, int index, uint32_t clocks) {
uint32_t bit; /* Pseudorandom bit */
Channel *chan; /* Channel handle */
int freqmod; /* Frequency modifications enabled */
uint32_t level; /* Stereo output level */
uint32_t sample; /* Input sample */
uint32_t until; /* Clocks to process sub-channel components */
int e; /* Iterator */
/* Select channel */
chan = &sim->vsu.channels[index];
/* Select input sample */
sample =
!chan->int_.enb ? 0 : /* Disabled */
index == 5 ? (sim->vsu.noise.register_ & 1) ? 63 : 0 : /* Noise */
chan->wave.wave > 4 ? 0 : /* Wave range */
sim->vsu.waves[chan->wave.wave][chan->wave.sample] /* Wave */
;
/* Compute output samples */
for (e = 0; e < 2; e++) {
level = e == 0 ? chan->lrv.left : chan->lrv.right;
level = (level * chan->env.value >> 3) + (level && chan->env.value);
chan->output[e] = level * sample;
}
/* Channel is disabled */
if (!chan->int_.enb)
return;
@ -147,7 +129,7 @@ static void vsuEmulateChannel(VB *sim, int index, uint32_t clocks) {
/* Wave */
if (index != 5) {
chan->clocks = 4 * (2048 - (uint32_t) chan->freq.current);
chan->clocks = 4 * (2048 - (uint32_t) chan->freq.current);
chan->wave.sample = (chan->wave.sample + 1) & 31;
}
@ -157,7 +139,7 @@ static void vsuEmulateChannel(VB *sim, int index, uint32_t clocks) {
bit = ((
sim->vsu.noise.register_ >> NOISE_TAPS[sim->vsu.noise.tap]^
sim->vsu.noise.register_ >> 7
) & 1) ^ 1;
) & 1) ^ 1;
sim->vsu.noise.register_ = bit |
(sim->vsu.noise.register_ << 1 & 0x7FFE);
}
@ -172,7 +154,6 @@ static void vsuEmulateChannel(VB *sim, int index, uint32_t clocks) {
chan->env.value++;
else if (chan->env.rep)
chan->env.value = chan->env.reload;
else chan->env.enb = 0;
chan->env.clocks = ((uint32_t) chan->env.interval + 1) * 307220;
}
@ -190,6 +171,33 @@ static void vsuEmulateChannel(VB *sim, int index, uint32_t clocks) {
}
/* Produce output for a channel */
static void vsuOutputChannel(VB *sim, int index, uint16_t *output) {
Channel *chan; /* Channel handle */
uint32_t level; /* Stereo output level */
uint32_t sample; /* Input sample */
int e; /* Iterator */
/* Select channel */
chan = &sim->vsu.channels[index];
/* Select input sample */
sample =
!chan->int_.enb ? 0 : /* Disabled */
index == 5 ? (sim->vsu.noise.register_ & 1) ? 63 : 0 : /* Noise */
chan->wave.wave > 4 ? 0 : /* Wave range */
sim->vsu.waves[chan->wave.wave][chan->wave.sample] /* Wave */
;
/* Compute output samples */
for (e = 0; e < 2; e++) {
level = e == 0 ? chan->lrv.left : chan->lrv.right;
level = (level * chan->env.value >> 3) + (level && chan->env.value);
output[e] += level * sample;
}
}
/* Write a value to S*EV0 */
static void vsuWriteEV0(VB *sim, int index, uint8_t value) {
Channel *chan = &sim->vsu.channels[index];
@ -201,7 +209,7 @@ static void vsuWriteEV0(VB *sim, int index, uint8_t value) {
chan->env.reload = chan->env.value;
/* Configure state */
chan->env.clocks = (uint32_t) chan->env.interval * 307220;
chan->env.clocks = 307220 * ((uint32_t) chan->env.interval + 1);
}
/* Write a value to S*EV1 */
@ -254,12 +262,16 @@ static void vsuWriteINT(VB *sim, int index, uint8_t value) {
chan->int_.interval = value & 31;
/* Update state */
chan->int_.clocks = 76805 * (uint32_t) chan->int_.interval;
chan->clocks = (index == 5 ? 40 : 4) *
((uint32_t) 2048 - chan->freq.current);
if (index != 5)
chan->int_.clocks = 76805 * ((uint32_t) chan->int_.interval + 1);
if (chan->env.enb)
chan->env.clocks = 307220 * ((uint32_t) chan->env.interval + 1);
if (index != 5) {
chan->wave.sample = 0;
else sim->vsu.noise.register_ = 0x0000;
chan->clocks = 4 * (2048 - (uint32_t) chan->freq.current);
} else {
sim->vsu.noise.register_ = 0x0000;
chan->clocks = 40 * (2048 - (uint32_t) chan->freq.current);
}
if (index == 4) {
sim->vsu.freqmod.clocks = (uint32_t) sim->vsu.freqmod.interval *
(sim->vsu.freqmod.clk ? 153610 : 19201);
@ -303,12 +315,11 @@ static void vsuWriteSWP(VB *sim, uint8_t value) {
/* Process component */
static void vsuEmulate(VB *sim, uint32_t clocks) {
Channel *chan; /* Channel handle */
uint32_t digital[2]; /* Digital output samples */
float i0; /* Current analog input sample */
float o0; /* Current analog output sample */
uint32_t until; /* Clocks to process channels */
int e, x; /* Iterators */
float i0; /* Current analog input sample */
float o0; /* Current analog output sample */
uint16_t output[2]; /* Digital output samples */
uint32_t until; /* Clocks to process channels */
int e, x; /* Iterators */
/* Process all clocks */
do {
@ -318,23 +329,28 @@ static void vsuEmulate(VB *sim, uint32_t clocks) {
if (sim->vsu.clocks < until)
until = sim->vsu.clocks;
/* Working variables */
clocks -= until;
digital[0] = digital[1] = 0;
/* Manage clocks */
clocks -= until;
sim->vsu.clocks -= until;
/* Process all channels */
for (x = 0; x < 6; x++) {
chan = &sim->vsu.channels[x];
for (x = 0; x < 6; x++)
vsuEmulateChannel(sim, x, until);
digital[0] += chan->output[0];
digital[1] += chan->output[1];
}
/* Wait for the current sample to finish */
if (sim->vsu.clocks != 0)
continue;
/* Compute the output sample */
output[0] = output[1] = 0;
for (x = 0; x < 6; x++)
vsuOutputChannel(sim, x, output);
/* Output sample */
for (e = 0; e < 2; e++) {
/* Compute the output sample for this stereo channel */
i0 = (digital[e] >> 4) / 685.0f;
i0 = (output[e] >> 4) / 685.0f;
o0 = RC_A * (sim->vsu.out.o1[e] + i0 - sim->vsu.out.i1[e]);
if (o0 < -1.0f) o0 = -1.0f;
if (o0 > +1.0f) o0 = +1.0f;
@ -501,12 +517,12 @@ static void vsuWrite(VB*sim,uint32_t address,int type,int32_t value,int debug){
case 0x518>>2: vsuWriteRAM(sim, 4, value); break; /* S5RAM */
case 0x51C>>2: vsuWriteSWP(sim, value); break; /* S5SWP */
case 0x540>>2: vsuWriteINT(sim, 5, value); break; /* S5INT */
case 0x544>>2: vsuWriteLRV(sim, 5, value); break; /* S5LRV */
case 0x548>>2: vsuWriteFQL(sim, 5, value); break; /* S5FQL */
case 0x54C>>2: vsuWriteFQH(sim, 5, value); break; /* S5FQH */
case 0x550>>2: vsuWriteEV0(sim, 5, value); break; /* S5EV0 */
case 0x554>>2: vsuWriteEV1(sim, 5, value); break; /* S5EV1 */
case 0x540>>2: vsuWriteINT(sim, 5, value); break; /* S6INT */
case 0x544>>2: vsuWriteLRV(sim, 5, value); break; /* S6LRV */
case 0x548>>2: vsuWriteFQL(sim, 5, value); break; /* S6FQL */
case 0x54C>>2: vsuWriteFQH(sim, 5, value); break; /* S6FQH */
case 0x550>>2: vsuWriteEV0(sim, 5, value); break; /* S6EV0 */
case 0x554>>2: vsuWriteEV1(sim, 5, value); break; /* S6EV1 */
case 0x580>>2: /* SSTOP */
if ((value & 1) == 0)

8
makefile
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@ -28,7 +28,8 @@ core:
-D VB_LITTLE_ENDIAN -D VB_SIGNED_PROPAGATE -D VB_DIV_GENERIC \
-D VB_DIRECT_EXCEPTION=textException -D VB_DIRECT_EXECUTE=textExecute \
-D VB_DIRECT_FETCH=testFetch -D VB_DIRECT_FRAME=testFrame \
-D VB_DIRECT_WRITE=testWrite -D VB_DIRECT_READ=testRead
-D VB_DIRECT_WRITE=testWrite -D VB_DIRECT_SAMPLES=testSamples \
-D VB_DIRECT_READ=testRead
# Clang generic
@emcc core/vb.c -I core -c -o /dev/null -O3 \
-Werror -std=c90 -Wall -Wextra -Wpedantic -fno-strict-aliasing
@ -38,14 +39,15 @@ core:
-D VB_LITTLE_ENDIAN -D VB_SIGNED_PROPAGATE -D VB_DIV_GENERIC \
-D VB_DIRECT_EXCEPTION=textException -D VB_DIRECT_EXECUTE=textExecute \
-D VB_DIRECT_FETCH=testFetch -D VB_DIRECT_FRAME=testFrame \
-D VB_DIRECT_WRITE=testWrite -D VB_DIRECT_READ=testRead
-D VB_DIRECT_WRITE=testWrite -D VB_DIRECT_SAMPLES=testSamples \
-D VB_DIRECT_READ=testRead
.PHONY: wasm
wasm:
@emcc -o web/core.wasm web/wasm.c core/vb.c -I core \
-D VB_LITTLE_ENDIAN -D VB_SIGNED_PROPAGATE \
-D "VBAPI=__attribute__((used))" \
--no-entry -O2 -flto -s WASM=1 \
--no-entry -O2 -flto -s WASM=1 -s WARN_ON_UNDEFINED_SYMBOLS=0 \
-s EXPORTED_RUNTIME_METHODS=[] -s ALLOW_MEMORY_GROWTH \
-s MAXIMUM_MEMORY=4GB -fno-strict-aliasing
@rm -f web/*.wasm.tmp*