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gpu: implement Buffer.mapAsync

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2022-03-15 11:53:31 -07:00 • committed by Stephen Gutekanst
parent 3ffc1ca5d8
commit 77b2210587
4 changed files with 67 additions and 13 deletions
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47
gpu/src/Buffer.zig
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@ -14,8 +14,14 @@ pub const VTable = struct {
// TODO:
// WGPU_EXPORT void const * wgpuBufferGetConstMappedRange(WGPUBuffer buffer, size_t offset, size_t size);
// WGPU_EXPORT void * wgpuBufferGetMappedRange(WGPUBuffer buffer, size_t offset, size_t size);
// WGPU_EXPORT void wgpuBufferMapAsync(WGPUBuffer buffer, WGPUMapModeFlags mode, size_t offset, size_t size, WGPUBufferMapCallback callback, void * userdata);
setLabel: fn (ptr: *anyopaque, label: [:0]const u8) void,
mapAsync: fn (
ptr: *anyopaque,
mode: MapMode,
offset: usize,
size: usize,
callback: *MapCallback,
) void,
unmap: fn (ptr: *anyopaque) void,
};
@ -35,6 +41,38 @@ pub inline fn setLabel(buf: Buffer, label: [:0]const u8) void {
buf.vtable.setLabel(buf.ptr, label);
}
pub inline fn mapAsync(
buf: Buffer,
mode: MapMode,
offset: usize,
size: usize,
callback: *MapCallback,
) void {
buf.vtable.mapAsync(buf.ptr, mode, offset, size, callback);
}
pub const MapCallback = struct {
type_erased_ctx: *anyopaque,
type_erased_callback: fn (ctx: *anyopaque, status: MapAsyncStatus) callconv(.Inline) void,
pub fn init(
comptime Context: type,
ctx: *Context,
comptime callback: fn (ctx: *Context, status: MapAsyncStatus) void,
) MapCallback {
const erased = (struct {
pub inline fn erased(type_erased_ctx: *anyopaque, status: MapAsyncStatus) void {
callback(@ptrCast(*Context, @alignCast(@alignOf(*Context), type_erased_ctx)), status);
}
}).erased;
return .{
.type_erased_ctx = ctx,
.type_erased_callback = erased,
};
}
};
pub inline fn unmap(buf: Buffer) void {
buf.vtable.unmap(buf.ptr);
}
@ -68,6 +106,12 @@ pub const MapAsyncStatus = enum(u32) {
unmapped_before_callback = 0x00000005,
};
pub const MapMode = enum(u32) {
none = 0x00000000,
read = 0x00000001,
write = 0x00000002,
};
test "syntax" {
_ = VTable;
_ = reference;
@ -78,4 +122,5 @@ test "syntax" {
_ = BindingType;
_ = BindingLayout;
_ = MapAsyncStatus;
_ = MapMode;
}