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gpu: add Dawn initialization safety check

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2023-06-01 00:08:46 -07:00
parent ada4f4134c
commit 8b8d16bbc8
1 changed files with 4 additions and 0 deletions
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4
libs/gpu/src/dawn_impl.zig
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@ -1,10 +1,12 @@
const gpu = @import("main.zig");
const builtin = @import("builtin");
const c = @cImport({
@cInclude("dawn/webgpu.h");
@cInclude("mach_dawn.h");
});
var didInit = false;
var procs: c.DawnProcTable = undefined;
/// A Dawn implementation of the gpu.Interface, which merely directs calls to the Dawn proc table.
@ -12,10 +14,12 @@ var procs: c.DawnProcTable = undefined;
/// Before use, it must be `.init()`ialized in order to set the global proc table.
pub const Interface = struct {
pub fn init() void {
didInit = true;
procs = c.machDawnGetProcTable();
}
pub inline fn createInstance(descriptor: ?*const gpu.Instance.Descriptor) ?*gpu.Instance {
if (builtin.mode == .Debug and !didInit) @panic("dawn: not initialized; did you forget to call gpu.Impl.init()?");
return @ptrCast(?*gpu.Instance, procs.createInstance.?(
@ptrCast(?*const c.WGPUInstanceDescriptor, descriptor),
));