[core, hle, video_core, memory] Improve multi-process, display layers, dynamic shader cache and rework overlay (#4238)

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

- Dynamic shader cache reloading capability for qlaunch
- Multi-process improvements (thanks to @frank1734), instead of just using the main application we now respect caller process (also did it for HID devices while I was at it)
- Layer stack masks & shared buffer screenshot for video core, added different masks (screenshot, recording, etc.) this was discovered as an issue due to how in qlaunch the transition was not right between applications. May not be perfect but also fixes screenshots while using qlaunch
- Reworked overlay display management (input and visibility) - instead of random numbers as I've previously did, I decided to add an AppletZIndex enum for better readability. Also split capability of input by touch and gamepad.
- etc.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4238
Reviewed-by: Samuel <lizzie@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

1 files changed, 8 insertions, 2 deletions

diff --git a/src/video_core/renderer_base.h b/src/video_core/renderer_base.h
index 67427f9372..46f8276074 100644
--- a/src/video_core/renderer_base.h
+++ b/src/video_core/renderer_base.h
@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: 2014 Citra Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -26,6 +29,7 @@ struct RendererSettings {
     void* screenshot_bits{};
     std::function<void(bool)> screenshot_complete_callback;
     Layout::FramebufferLayout screenshot_framebuffer_layout;
+    Service::Nvnflinger::LayerStackId screenshot_layer_stack{Service::Nvnflinger::LayerStackId::Default};
 };
 
 class RendererBase {
@@ -88,9 +92,11 @@ public:
     /// Returns true if a screenshot is being processed
     bool IsScreenshotPending() const;
 
-    /// Request a screenshot of the next frame
+    /// Request a screenshot of the next frame.
     void RequestScreenshot(void* data, std::function<void(bool)> callback,
-                           const Layout::FramebufferLayout& layout);
+                           const Layout::FramebufferLayout& layout,
+                           Service::Nvnflinger::LayerStackId layer_stack =
+                               Service::Nvnflinger::LayerStackId::Default);
 
 protected:
     Core::Frontend::EmuWindow& render_window; ///< Reference to the render window handle.