cocoa-cb: use libmpv's advanced rendering control and timing

this adds support for GPU rendered screenshots, DR (theoretically) and
possible other advanced functions in the future that need to be executed
from the rendering thread.
additionally frames that would be off screen or not be displayed when on
screen are being dropped now.

1 files changed, 22 insertions, 2 deletions

diff --git a/osdep/macOS_mpv_helper.swift b/osdep/macOS_mpv_helper.swift
index a1bb03f508..8f6221d87c 100644
--- a/osdep/macOS_mpv_helper.swift
+++ b/osdep/macOS_mpv_helper.swift
@@ -36,6 +36,7 @@ class MPVHelper: NSObject {
     var mpctx: UnsafeMutablePointer<MPContext>?
     var macOpts: macos_opts?
     var fbo: GLint = 1
+    let deinitLock = NSLock()
 
     init(_ mpv: OpaquePointer) {
         super.init()
@@ -58,6 +59,7 @@ class MPVHelper: NSObject {
     }
 
     func initRender() {
+        var advanced: CInt = 1
         let api = UnsafeMutableRawPointer(mutating: (MPV_RENDER_API_TYPE_OPENGL as NSString).utf8String)
         var pAddress = mpv_opengl_init_params(get_proc_address: getProcAddress,
                                               get_proc_address_ctx: nil,
@@ -65,6 +67,7 @@ class MPVHelper: NSObject {
         var params: [mpv_render_param] = [
             mpv_render_param(type: MPV_RENDER_PARAM_API_TYPE, data: api),
             mpv_render_param(type: MPV_RENDER_PARAM_OPENGL_INIT_PARAMS, data: &pAddress),
+            mpv_render_param(type: MPV_RENDER_PARAM_ADVANCED_CONTROL, data: &advanced),
             mpv_render_param()
         ]
 
@@ -110,13 +113,26 @@ class MPVHelper: NSObject {
 
     func reportRenderFlip() {
         if mpvRenderContext == nil { return }
-            mpv_render_context_report_swap(mpvRenderContext)
+        mpv_render_context_report_swap(mpvRenderContext)
     }
 
-    func drawRender(_ surface: NSSize) {
+    func isRenderUpdateFrame() -> Bool {
+        deinitLock.lock()
+        if mpvRenderContext == nil {
+            deinitLock.unlock()
+            return false
+        }
+        let flags: UInt64 = mpv_render_context_update(mpvRenderContext)
+        deinitLock.unlock()
+        return flags & UInt64(MPV_RENDER_UPDATE_FRAME.rawValue) > 0
+    }
+
+    func drawRender(_ surface: NSSize, skip: Bool = false) {
+        deinitLock.lock()
         if mpvRenderContext != nil {
             var i: GLint = 0
             var flip: CInt = 1
+            var skip: CInt = skip ? 1 : 0
             glGetIntegerv(GLenum(GL_DRAW_FRAMEBUFFER_BINDING), &i)
             // CAOpenGLLayer has ownership of FBO zero yet can return it to us,
             // so only utilize a newly received FBO ID if it is nonzero.
@@ -129,6 +145,7 @@ class MPVHelper: NSObject {
             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_SKIP_RENDERING, data: &skip),
                 mpv_render_param()
             ]
             mpv_render_context_render(mpvRenderContext, &params);
@@ -136,6 +153,7 @@ class MPVHelper: NSObject {
             glClearColor(0, 0, 0, 1)
             glClear(GLbitfield(GL_COLOR_BUFFER_BIT))
         }
+        deinitLock.unlock()
     }
 
     func setRenderICCProfile(_ profile: NSColorSpace) {
@@ -258,8 +276,10 @@ class MPVHelper: NSObject {
     func deinitRender() {
         mpv_render_context_set_update_callback(mpvRenderContext, nil, nil)
         mp_render_context_set_control_callback(mpvRenderContext, nil, nil)
+        deinitLock.lock()
         mpv_render_context_free(mpvRenderContext)
         mpvRenderContext = nil
+        deinitLock.unlock()
     }
 
     func deinitMPV(_ destroy: Bool = false) {