mirror of
https://github.com/ghostty-org/ghostty.git
synced 2025-07-25 05:06:24 +03:00
1f733c9e7f
Fixes memory leak. We always need to release these descriptors; the textures themselves will retain or copy them if necessary.
111 lines
3.1 KiB
Zig
111 lines
3.1 KiB
Zig
//! Represents a render target.
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//!
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//! In this case, an IOSurface-backed MTLTexture.
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const Self = @This();
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const assert = std.debug.assert;
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const builtin = @import("builtin");
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const objc = @import("objc");
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const macos = @import("macos");
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const graphics = macos.graphics;
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const IOSurface = macos.iosurface.IOSurface;
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const mtl = @import("api.zig");
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const log = std.log.scoped(.metal);
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/// Options for initializing a Target
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pub const Options = struct {
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/// MTLDevice
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device: objc.Object,
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/// Desired width
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width: usize,
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/// Desired height
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height: usize,
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/// Pixel format for the MTLTexture
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pixel_format: mtl.MTLPixelFormat,
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/// Storage mode for the MTLTexture
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storage_mode: mtl.MTLResourceOptions.StorageMode,
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};
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/// The underlying IOSurface.
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surface: *IOSurface,
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/// The underlying MTLTexture.
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texture: objc.Object,
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/// Current width of this target.
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width: usize,
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/// Current height of this target.
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height: usize,
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pub fn init(opts: Options) !Self {
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// We set our surface's color space to Display P3.
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// This allows us to have "Apple-style" alpha blending,
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// since it seems to be the case that Apple apps like
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// Terminal and TextEdit render text in the display's
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// color space using converted colors, which reduces,
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// but does not fully eliminate blending artifacts.
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const colorspace = try graphics.ColorSpace.createNamed(.displayP3);
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defer colorspace.release();
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const surface = try IOSurface.init(.{
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.width = @intCast(opts.width),
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.height = @intCast(opts.height),
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.pixel_format = .@"32BGRA",
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.bytes_per_element = 4,
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.colorspace = colorspace,
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});
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// Create our descriptor
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const desc = init: {
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const Class = objc.getClass("MTLTextureDescriptor").?;
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const id_alloc = Class.msgSend(objc.Object, objc.sel("alloc"), .{});
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const id_init = id_alloc.msgSend(objc.Object, objc.sel("init"), .{});
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break :init id_init;
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};
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defer desc.release();
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// Set our properties
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desc.setProperty("width", @as(c_ulong, @intCast(opts.width)));
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desc.setProperty("height", @as(c_ulong, @intCast(opts.height)));
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desc.setProperty("pixelFormat", @intFromEnum(opts.pixel_format));
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desc.setProperty("usage", mtl.MTLTextureUsage{ .render_target = true });
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desc.setProperty(
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"resourceOptions",
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mtl.MTLResourceOptions{
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// Indicate that the CPU writes to this resource but never reads it.
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.cpu_cache_mode = .write_combined,
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.storage_mode = opts.storage_mode,
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},
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);
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const id = opts.device.msgSend(
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?*anyopaque,
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objc.sel("newTextureWithDescriptor:iosurface:plane:"),
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.{
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desc,
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surface,
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@as(c_ulong, 0),
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},
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) orelse return error.MetalFailed;
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const texture = objc.Object.fromId(id);
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return .{
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.surface = surface,
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.texture = texture,
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.width = opts.width,
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.height = opts.height,
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};
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}
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pub fn deinit(self: *Self) void {
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self.surface.deinit();
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self.texture.release();
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}
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