yattee/macOS/VideoLayer.swift

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Swift
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import Cocoa
import OpenGL.GL
import OpenGL.GL3
import Libmpv
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final class VideoLayer: CAOpenGLLayer {
var client: MPVClient!
override init() {
super.init()
autoresizingMask = [.layerWidthSizable, .layerHeightSizable]
backgroundColor = NSColor.black.cgColor
}
@available(*, unavailable)
required init?(coder _: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func canDraw(
inCGLContext _: CGLContextObj,
pixelFormat _: CGLPixelFormatObj,
forLayerTime _: CFTimeInterval,
displayTime _: UnsafePointer<CVTimeStamp>?
) -> Bool {
true
}
override func draw(
inCGLContext ctx: CGLContextObj,
pixelFormat _: CGLPixelFormatObj,
forLayerTime _: CFTimeInterval,
displayTime _: UnsafePointer<CVTimeStamp>?
) {
var i: GLint = 0
var flip: CInt = 1
var ditherDepth = 8
glGetIntegerv(GLenum(GL_DRAW_FRAMEBUFFER_BINDING), &i)
if client.mpvGL != nil {
var data = mpv_opengl_fbo(
fbo: Int32(i),
w: Int32(bounds.size.width),
h: Int32(bounds.size.height),
internal_format: 0
)
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var params: [mpv_render_param] = [
mpv_render_param(type: MPV_RENDER_PARAM_OPENGL_FBO, data: &data),
mpv_render_param(type: MPV_RENDER_PARAM_FLIP_Y, data: &flip),
mpv_render_param(type: MPV_RENDER_PARAM_DEPTH, data: &ditherDepth),
mpv_render_param()
]
mpv_render_context_render(client.mpvGL, &params)
} else {
glClearColor(0, 0, 0, 1)
glClear(GLbitfield(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT))
}
CGLFlushDrawable(ctx)
}
override func copyCGLPixelFormat(forDisplayMask _: UInt32) -> CGLPixelFormatObj {
let attrs: [CGLPixelFormatAttribute] = [
kCGLPFAOpenGLProfile, CGLPixelFormatAttribute(kCGLOGLPVersion_3_2_Core.rawValue),
kCGLPFADoubleBuffer,
kCGLPFAAllowOfflineRenderers,
kCGLPFABackingStore,
kCGLPFAAccelerated,
kCGLPFASupportsAutomaticGraphicsSwitching,
_CGLPixelFormatAttribute(rawValue: 0)
]
var npix: GLint = 0
var pix: CGLPixelFormatObj?
CGLChoosePixelFormat(attrs, &pix, &npix)
return pix!
}
override func copyCGLContext(forPixelFormat pf: CGLPixelFormatObj) -> CGLContextObj {
let ctx = super.copyCGLContext(forPixelFormat: pf)
var i: GLint = 1
CGLSetParameter(ctx, kCGLCPSwapInterval, &i)
CGLEnable(ctx, kCGLCEMPEngine)
CGLSetCurrentContext(ctx)
client.create()
initDisplayLink()
return ctx
}
override func display() {
super.display()
CATransaction.flush()
}
let displayLinkCallback: CVDisplayLinkOutputCallback = { _, _, _, _, _, displayLinkContext -> CVReturn in
let layer: VideoLayer = unsafeBitCast(displayLinkContext, to: VideoLayer.self)
if layer.client?.mpvGL != nil {
mpv_render_context_report_swap(layer.client.mpvGL)
}
return kCVReturnSuccess
}
func initDisplayLink() {
let displayId = UInt32(NSScreen.main?.deviceDescription[NSDeviceDescriptionKey("NSScreenNumber")] as! Int)
CVDisplayLinkCreateWithCGDisplay(displayId, &client.link)
CVDisplayLinkSetOutputCallback(
client.link!, displayLinkCallback,
UnsafeMutableRawPointer(Unmanaged.passUnretained(client.layer).toOpaque())
)
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CVDisplayLinkStart(client.link!)
}
func uninitDisplaylink() {
if CVDisplayLinkIsRunning(client.link!) {
CVDisplayLinkStop(client.link!)
}
}
}