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// OpenAL wrapper
// Copyright (C) 2021-2023, 2025 Nguyễn Gia Phong
//
// This file is part of zeal.
//
// Zeal is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Zeal is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with zeal. If not, see <https://www.gnu.org/licenses/>.
const Child = meta.Child;
const Tag = meta.Tag;
const meta = @import("std").meta;
const c = @import("cimport.zig");
pub const Error = error{
/// Bad name (ID) passed to an OpenAL function.
InvalidName,
/// Invalid enum parameter passed to an OpenAL function.
InvalidEnum,
/// Invalid value parameter passed to an OpenAL function.
InvalidValue,
/// Requested operation invalid.
InvalidOperation,
/// Requested operation resulted in OpenAL running out of memory.
OutOfMemory,
};
pub const FALSE = c.AL_FALSE;
pub const TRUE = c.AL_TRUE;
pub const AUTO = c.AL_AUTO_SOFT;
/// Convert bool to AL enumeration.
pub fn boolToEnum(value: bool) c_int {
return if (value) TRUE else FALSE;
}
pub const listener = struct {
const Property = enum(c.ALenum) {
gain = c.AL_GAIN,
position = c.AL_POSITION,
velocity = c.AL_VELOCITY,
orientation = c.AL_ORIENTATION,
meters_per_unit = c.AL_METERS_PER_UNIT,
};
/// Set a property for the listener.
pub fn set(property: Property, value: anytype) Error!void {
const param = @intFromEnum(property);
const T = @TypeOf(value);
switch (T) {
f32 => c.alListenerf(param, value),
i32 => c.alListeneri(param, value),
else => switch (Child(T)) {
f32 => c.alListenerfv(param, value[0..]),
i32 => c.alListeneriv(param, value[0..]),
else => unreachable,
},
}
switch (c.alGetError()) {
c.AL_NO_ERROR => {},
c.AL_INVALID_VALUE => return Error.InvalidValue,
c.AL_INVALID_ENUM => return Error.InvalidEnum,
c.AL_INVALID_OPERATION => return Error.InvalidOperation,
else => unreachable,
}
}
};
pub const Data = union(enum) {
/// Unsigned 8-bit mono.
mono8: []const u8,
/// Signed 16-bit mono.
mono16: []const i16,
/// Unsigned 8-bit stereo.
stereo8: []const u8,
/// Signed 16-bit stereo.
stereo16: []const i16,
};
pub const buffer = struct {
/// Generate one buffer for audio data and return its reference.
pub fn create() Error!u32 {
var reference: u32 = undefined;
c.alGenBuffers(1, &reference);
return switch (c.alGetError()) {
c.AL_NO_ERROR => reference,
c.AL_INVALID_VALUE => Error.InvalidValue,
c.AL_OUT_OF_MEMORY => Error.OutOfMemory,
else => unreachable,
};
}
/// Free resources used by one buffer.
/// Buffers attached to a source cannot be deleted.
pub fn destroy(reference: *const u32) Error!void {
c.alDeleteBuffers(1, reference);
switch (c.alGetError()) {
c.AL_NO_ERROR => {},
c.AL_INVALID_OPERATION => return Error.InvalidOperation,
c.AL_INVALID_NAME => return Error.InvalidName,
c.AL_INVALID_VALUE => return Error.InvalidValue,
else => unreachable,
}
}
/// Fill a buffer with audio data.
pub fn fill(reference: u32, data: Data, freq: i32) Error!void {
const format = switch (data) {
.mono8 => c.AL_FORMAT_MONO8,
.mono16 => c.AL_FORMAT_MONO16,
.stereo8 => c.AL_FORMAT_STEREO8,
.stereo16 => c.AL_FORMAT_STEREO16,
};
switch (data) {
.mono8, .stereo8 => |slice|
c.alBufferData(reference, format,
slice.ptr, @intCast(slice.len), freq),
.mono16, .stereo16 => |slice|
c.alBufferData(reference, format,
slice.ptr, @intCast(slice.len * 2), freq),
}
switch (c.alGetError()) {
c.AL_NO_ERROR => {},
c.AL_OUT_OF_MEMORY => return Error.OutOfMemory,
c.AL_INVALID_VALUE => return Error.InvalidValue,
c.AL_INVALID_ENUM => return Error.InvalidEnum,
else => unreachable,
}
}
};
pub const source = struct {
/// Generate one source for audio data and return its reference.
pub fn create() Error!u32 {
var reference: u32 = undefined;
c.alGenSources(1, &reference);
return switch (c.alGetError()) {
c.AL_NO_ERROR => reference,
c.AL_INVALID_VALUE => Error.InvalidValue,
c.AL_OUT_OF_MEMORY => Error.OutOfMemory,
else => unreachable,
};
}
/// Free resources used by one source.
/// Sources attached to a source cannot be deleted.
pub fn destroy(reference: *const u32) Error!void {
c.alDeleteSources(1, reference);
switch (c.alGetError()) {
c.AL_NO_ERROR => {},
c.AL_INVALID_OPERATION => return Error.InvalidOperation,
c.AL_INVALID_NAME => return Error.InvalidName,
c.AL_INVALID_VALUE => return Error.InvalidValue,
else => unreachable,
}
}
const Property = enum(c.ALenum) {
pitch = c.AL_PITCH,
gain = c.AL_GAIN,
position = c.AL_POSITION,
velocity = c.AL_VELOCITY,
direction = c.AL_DIRECTION,
relative = c.AL_SOURCE_RELATIVE,
looping = c.AL_LOOPING,
buffer = c.AL_BUFFER,
state = c.AL_SOURCE_STATE,
sec_offset = c.AL_SEC_OFFSET,
spatialize = c.AL_SOURCE_SPATIALIZE_SOFT,
};
pub const State = enum(i32) {
initial = c.AL_INITIAL,
playing = c.AL_PLAYING,
paused = c.AL_PAUSED,
stopped = c.AL_STOPPED,
};
/// Set a property for the source.
pub fn set(reference: u32, property: Property, value: anytype) Error!void {
const param = @intFromEnum(property);
const T = @TypeOf(value);
switch (T) {
f32 => c.alSourcef(reference, param, value),
i32 => c.alSourcei(reference, param, value),
else => switch (@typeInfo(T)) {
.@"enum" => c.alSourcei(reference, param, @intFromEnum(value)),
else => switch (Child(T)) {
f32 => c.alSourcefv(reference, param, value[0..]),
i32 => c.alSourceiv(reference, param, value[0..]),
else => unreachable,
},
},
}
switch (c.alGetError()) {
c.AL_NO_ERROR => {},
c.AL_INVALID_VALUE => return Error.InvalidValue,
c.AL_INVALID_ENUM => return Error.InvalidEnum,
c.AL_INVALID_NAME => return Error.InvalidName,
c.AL_INVALID_OPERATION => return Error.InvalidOperation,
else => unreachable,
}
}
/// Get a scalar property from the source.
pub fn get(comptime T: type, reference: u32, property: Property) Error!T {
const param = @intFromEnum(property);
var value: T = undefined;
switch (T) {
f32 => c.alGetSourcef(reference, param, &value),
i32 => c.alGetSourcei(reference, param, &value),
else => switch (@typeInfo(T)) {
.@"enum" => {
var raw: i32 = undefined;
c.alGetSourcei(reference, param, &raw);
value = @enumFromInt(raw);
},
else => unreachable,
},
}
return switch (c.alGetError()) {
c.AL_NO_ERROR => value,
c.AL_INVALID_VALUE => return Error.InvalidValue,
c.AL_INVALID_ENUM => return Error.InvalidEnum,
c.AL_INVALID_NAME => return Error.InvalidName,
c.AL_INVALID_OPERATION => return Error.InvalidOperation,
else => unreachable,
};
}
/// Play the source.
pub fn play(reference: u32) Error!void {
c.alSourcePlay(reference);
switch (c.alGetError()) {
c.AL_NO_ERROR => {},
c.AL_INVALID_NAME => return Error.InvalidName,
c.AL_INVALID_OPERATION => return Error.InvalidOperation,
else => unreachable,
}
}
};
// alSourcePause
// alSourceStop
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