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Quick and dirty sound for DOOM. Samplerate seems off, but it's just a demo.

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This commit is contained in:
Toby Jaffey 2025-12-14 23:32:34 +00:00
parent e524ea4815
commit 39e7dddc5a
4 changed files with 83 additions and 10 deletions
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65
hosts/host-sdl/host-sdl.c
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@ -33,6 +33,12 @@ static keyevent_t keyBuffer[KEYBUFFER_LEN];
static int keyBufferWr = 0;
static int keyBufferRd = 0;
// circular buffer of audio samples, so vm code can read them as it's ready
#define AUDIOBUFFER_LEN 4096
static int16_t audioBuffer[AUDIOBUFFER_LEN];
static int audioBufferWr = 0;
static int audioBufferRd = 0;
void key_enq(uint16_t scancode, bool down) {
keyBuffer[keyBufferWr].scancode = scancode;
keyBuffer[keyBufferWr].down = down;
@ -50,6 +56,22 @@ bool key_deq(keyevent_t *ke) {
}
}
void audio_enq(int16_t sample) {
audioBuffer[audioBufferWr] = sample;
audioBufferWr = (audioBufferWr + 1) % AUDIOBUFFER_LEN;
}
bool audio_deq(int16_t *sample) {
if (audioBufferWr != audioBufferRd) {
*sample = audioBuffer[audioBufferRd];
audioBufferRd = (audioBufferRd + 1) % AUDIOBUFFER_LEN;
return true;
} else {
return false;
}
}
static uint8_t *read_file(const char* filename, int *len) {
FILE* f = fopen(filename, "rb");
uint8_t *buf = NULL;
@ -107,6 +129,27 @@ void usage(const char *name) {
exit(1);
}
void audiocb(void *userdata, SDL_AudioStream *stream, int additional_amount, int total_amount) {
if (audioBufferWr == audioBufferRd) { // empty
return;
}
while(total_amount > 0) {
int16_t sample[2];
// always expect audio in pairs
if (audio_deq(&sample[0])) {
if (audio_deq(&sample[1])) {
if (!SDL_PutAudioStreamData(stream, sample, 4)) {
printf("audio write failed\r\n");
}
}
} else {
return;
}
total_amount -= 4;
}
}
int main(int argc, char *argv[]) {
@ -199,6 +242,19 @@ int main(int argc, char *argv[]) {
render_target = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_ABGR8888, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
SDL_SetTextureScaleMode(render_target, SDL_SCALEMODE_NEAREST);
SDL_AudioSpec srcspec = {
.format = SDL_AUDIO_S16,
.channels = 2,
.freq = 44100,
};
SDL_AudioStream *stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &srcspec, audiocb, NULL);
if (NULL == stream) {
printf("Could not setup audio!\n");
return 1;
}
SDL_ResumeAudioStreamDevice(stream);
while (isrunning) {
SDL_PollEvent(&event);
@ -277,6 +333,15 @@ int main(int argc, char *argv[]) {
case UVM32_SYSCALL_GETC: {
uvm32_arg_setval(vmst, &evt, RET, 0xFFFFFFFF);
} break;
case UVM32_SYSCALL_RENDERAUDIO: {
uvm32_slice_t buf = uvm32_arg_getslice(vmst, &evt, ARG0, ARG1);
printf("Got audio buf len=%d\n", buf.len);
int16_t *samples = (int16_t *)buf.ptr;
for (int i=0;i<buf.len/2;i++) {
audio_enq(samples[i]);
}
} break;
case UVM32_SYSCALL_RENDER: {
uvm32_slice_t buf = uvm32_arg_getslice(vmst, &evt, ARG0, ARG1);