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Fix host-sdl/doom audio. Have app ask via syscall if audio can be rendered before sending, else any mismatch in rates will cause queue over/underflow in host-sdl.

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This commit is contained in:
Toby Jaffey 2025-12-15 10:48:10 +00:00
parent 4e61e3bd4a
commit 09985655a2
4 changed files with 16 additions and 8 deletions
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6
apps/zigdoom/src/main.zig
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@ -198,8 +198,10 @@ fn submain() !void {
while(true) {
pd.doom_update();
const doomSndBuf: [*]i16 = pd.doom_get_sound_buffer();
uvm.renderAudio(doomSndBuf, 2048);
if (uvm.canRenderAudio()) {
const doomSndBuf: [*]i16 = pd.doom_get_sound_buffer();
uvm.renderAudio(doomSndBuf, 2048);
}
const fb: [*]const u8 = pd.doom_get_framebuffer(4);
uvm.render(fb, WIDTH * HEIGHT * 4);

4
apps/zigdoom/src/uvm.zig
View file

@ -24,6 +24,10 @@ pub inline fn syscall(id: u32, param1: u32, param2: u32) u32 {
return val;
}
pub inline fn canRenderAudio() bool {
return syscall(uvm32.UVM32_SYSCALL_CANRENDERAUDIO, 0, 0) != 0;
}
pub inline fn renderAudio(audbuf: [*]const i16, len:u32) void {
_ = syscall(uvm32.UVM32_SYSCALL_RENDERAUDIO, @intFromPtr(audbuf), len);
}