Applied-Software/ghostty
5
0
Fork 0
mirror of https://github.com/ghostty-org/ghostty.git synced 2025-07-21 11:16:08 +03:00
Code Issues Packages Projects Releases Wiki Activity

renderer/metal: implement triple-buffering

Browse Source
This commit is contained in:
Mitchell Hashimoto
2024-04-21 19:26:17 -07:00
parent 2dc8ae2ed7
commit 20bfbd9b2e
1 changed files with 20 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
src/renderer/Metal.zig
View File

@ -122,11 +122,6 @@ custom_shader_state: ?CustomShaderState = null,
/// this will have to be part of the frame state.
health: std.atomic.Value(Health) = .{ .raw = .healthy },
/// Sempahore blocking our in-flight buffer updates. For now this is just
/// one but in the future if we implement double/triple-buffering this
/// will be incremented.
inflight: std.Thread.Semaphore = .{ .permits = 1 },
/// Our GPU state
gpu_state: GPUState,
@ -167,6 +162,21 @@ pub const GPUState = struct {
for (0..BufferCount) |_| self.frame_sema.wait();
for (&self.frames) |*frame| frame.deinit();
}
/// Get the next frame state to draw to. This will wait on the
/// semaphore to ensure that the frame is available. This must
/// always be paired with a call to releaseFrame.
pub fn nextFrame(self: *GPUState) *FrameState {
self.frame_sema.wait();
errdefer self.frame_sema.post();
self.frame_index = (self.frame_index + 1) % BufferCount;
return &self.frames[self.frame_index];
}
/// This should be called when the frame has completed drawing.
pub fn releaseFrame(self: *GPUState) void {
self.frame_sema.post();
}
};
/// State we need duplicated for every frame. Any state that could be
@ -566,13 +576,6 @@ pub fn init(alloc: Allocator, options: renderer.Options) !Metal {
}
pub fn deinit(self: *Metal) void {
// If we have inflight buffers, wait for completion. This ensures that
// any pending GPU operations are completed before we start deallocating
// everything. This is important because our completion callbacks access
// "self"
self.inflight.wait();
// All inflight frames are done, deinit our GPU state.
self.gpu_state.deinit();
self.cells.deinit(self.alloc);
@ -812,12 +815,12 @@ pub fn updateFrame(
pub fn drawFrame(self: *Metal, surface: *apprt.Surface) !void {
_ = surface;
// Wait for a buffer to be available.
self.inflight.wait();
errdefer self.inflight.post();
// Wait for a frame to be available.
const frame = self.gpu_state.nextFrame();
errdefer self.gpu_state.releaseFrame();
//log.debug("drawing frame index={}", .{self.gpu_state.frame_index});
// Setup our frame data
const frame = &self.gpu_state.frames[self.gpu_state.frame_index];
try frame.uniforms.sync(self.gpu_state.device, &.{self.uniforms});
try frame.cells_bg.sync(self.gpu_state.device, self.cells_bg.items);
try frame.cells.sync(self.gpu_state.device, self.cells.items);
@ -1036,7 +1039,7 @@ fn bufferCompleted(
}
// Always release our semaphore
self.inflight.post();
self.gpu_state.releaseFrame();
}
fn drawPostShader(