progress: ImGui Port - Desktop UI + ImGui rendering performance overhaul

Full ImGui desktop environment (desktop.pas):
- Gradient wallpaper, taskbar with clock, start menu
- Desktop icons with click-to-open
- Windowed apps: System Info, Terminal, File Browser, Task Manager
- Terminal dispatches to registered kernel commands with output capture

Performance: Software rasterizer rewrite (imgui.pas, imgbridge.c)
- Quad detection: merge consecutive triangle pairs into fast rect fills
- 3 new fast-path rect fillers (solid/gradient/textured) using REP STOSD
  and 16.16 fixed-point integer inner loops
- Triangle rasterizer rewritten with fixed-point edge functions
- Back-buffer clear: DrawPixel loop -> REP STOSD (~200x faster)
- Render stat debug counters added

ISR-safe input buffering (imgbridge.c)
- Keyboard/mouse events buffered in lock-free ring buffers from ISR context
- Drained once per frame from main loop to prevent data races

Other changes:
- imguitypes.pas: InputTextFlags renumbered for cimgui 1.91+
- video.pas: backBufferLocation getter added
- kernel.pas: VFS init moved earlier, main loop uses desktop_frame,
  mouse hook uses ISR-safe buffering
- lmemorymanager.pas: kalloc/kfree exported with public aliases for C linkage
- scheduler.pas: Root_Task moved to interface for desktop task manager
- terminal.pas: freeParams exposed in interface

.drone.yml

@@ -0,0 +1,52 @@
+kind: pipeline
+type: docker
+name: build
+
+steps:
+  - name: build-image
+    image: plugins/docker
+    settings:
+      repo: t3hn3rd/asuro-build
+      tags: latest
+      dockerfile: Dockerfile
+      registry: docker.io
+      username:
+        from_secret: docker_username
+      password:
+        from_secret: docker_password
+
+  - name: compile
+    image: t3hn3rd/asuro-build:latest
+    depends_on:
+      - build-image
+    commands:
+      - git fetch --tags
+      - find . -type f -print0 | xargs -0 dos2unix
+      - chmod +x /drone/src/*.sh
+      - /drone/src/compile.sh
+
+  - name: upload-iso-artifact
+    image: alpine/git
+    depends_on:
+      - compile
+    when:
+      branch:
+        - master
+    environment:
+      GITEA_TOKEN:
+        from_secret: gitea_token
+    commands:
+      - apk add --no-cache curl
+      - chmod +w Asuro.iso
+      - cp Asuro.iso "Asuro-$(git rev-parse --short HEAD).iso"
+      - echo "Uploading Asuro-$(git rev-parse --short HEAD).iso to Gitea Packages..."
+      - |
+         curl -X PUT "https://gitea.spexeah.com/api/packages/Spexeah/generic/asuro-iso/$(git rev-parse --short HEAD)/Asuro.iso" \
+         -H "Authorization: token $GITEA_TOKEN" --upload-file "Asuro-$(git rev-parse --short HEAD).iso"
+      - echo "Updating latest ISO reference..."
+      - |
+        curl -X DELETE https://gitea.spexeah.com/api/packages/Spexeah/generic/asuro-iso/latest/Asuro.iso \
+        -H "Authorization: token $GITEA_TOKEN" || echo "No previous latest version found."
+      - |
+        curl -X PUT https://gitea.spexeah.com/api/packages/Spexeah/generic/asuro-iso/latest/Asuro.iso \
+        -H "Authorization: token $GITEA_TOKEN" --upload-file "Asuro-$(git rev-parse --short HEAD).iso"

.gitignore

@@ -10,5 +10,4 @@
 /*.sh~
 /*.img
 src/include/asuro.pas
-.vscode/launch.json
-.vscode
+localenv.json

.gitlab-ci.yml

@@ -1,73 +0,0 @@
-stages:
-  - Compile Versions
-  - Compile Sources
-  - Link
-  - Generate Documentation
-  - Deploy
-
-cache:
-  - key: ${CI_COMMIT_REF_SLUG}
-    paths:
-      - lib/*.o
-      - bin/kernel.bin
-      - doc
-
-before_script:
-  - chmod +x *.sh
-
-versions:
-  stage: Compile Versions
-  script:
-    - ./compile_vergen.sh
-  artifacts:
-    paths:
-      - release/*.svg
-      - src/include/asuro.pas
-
-compile_sources:
-  stage: Compile Sources
-  script:
-    - rm -f lib/*.so
-    - ./compile_sources.sh
-  needs:
-    - versions
-
-link:
-  stage: Link
-  script:
-    - ./compile_stub.sh
-    - ./compile_link.sh
-  needs:
-    - versions
-    - compile_sources
-
-isogen:
-  stage: Deploy
-  script:
-    - ./compile_isogen.sh
-    - ./compile_sumgen.sh
-  artifacts:
-    paths:
-      - ./Asuro.iso
-      - ./release/checksum.svg
-  needs:
-    - link
-
-docgen:
-  stage: Generate Documentation
-  only:
-    - master
-    - develop
-  script:
-    - ./compile_sourcelist.sh
-    - ./compile_docs.sh
-    # Remove comments when we want to use gitlab pages.
-    #- cp doc public
-  allow_failure: true
-  artifacts:
-    paths:
-      - doc
-      #- public/*
-      #- ./sources.list
-  needs:
-    - versions

.vscode/launch.json

@@ -3,18 +3,11 @@
         {
             "name":"Run",
             "request": "launch",
-            "type": "coreclr",
+            "type": "PowerShell",
             "preLaunchTask": "Build",
-            "program": "VBoxSDL",
-            "args": [
-                "--comment", 
-                "Asuro", 
-                "--startvm", 
-                "7d395c96-891c-4139-b77d-9b6b144b0b93"
-            ],
+            "script": "${workspaceFolder}/virtualbox-wrapper.ps1",
+            "args": ["-Command", "up"],
             "cwd": "${workspaceFolder}",
-            "console": "internalConsole",
-            "internalConsoleOptions": "neverOpen"
         }
     ]
 }

.vscode/tasks.json

@@ -9,14 +9,18 @@
             "command": "docker-compose",
             "args": [
                 "run",
-                "builder"
+                "builder",
             ],
             "type": "shell",
             "problemMatcher": [],
             "group": {
                 "kind": "build",
                 "isDefault": true
-            }
+            },
+            "dependsOn": [
+                "Close VirtualBox",
+                "Clean"
+            ]
         },
         {
             "label": "Build (Builder)",
@@ -26,6 +30,24 @@
                 "builder"
             ],
             "type": "shell"
+        },
+        {
+            "label": "Clean",
+            "command": "docker-compose",
+            "args": [
+                "down",
+                "--remove-orphans"
+            ],
+            "type": "shell"
+        },
+        {
+            "label": "Close VirtualBox",
+            "command": "./virtualbox-wrapper.ps1",
+            "args": [
+                "-Command", 
+                "down"
+            ],
+            "type": "shell"
         }
     ]
 }

Dockerfile

@@ -5,9 +5,12 @@ VOLUME ["/code"]
 ENV DEBIAN_FRONTEND=noninteractive
 RUN dpkg --add-architecture i386
 RUN apt-get update && apt-get install -y \
-	curl dos2unix wget git make nasm binutils:i386 xorriso grub-pc-bin && \
+	curl dos2unix wget git make nasm binutils xorriso grub-pc-bin \
+	gcc-multilib g++-multilib && \
 	apt-get clean my room
 
+RUN git clone --depth=1 --recurse-submodules https://github.com/cimgui/cimgui.git /cimgui
+
 SHELL ["/bin/bash", "-c"]
 ARG FPC_VERSION=2.6.4
 RUN curl -sL https://sourceforge.net/projects/freepascal/files/Linux/$FPC_VERSION/fpc-$FPC_VERSION.i386-linux.tar/download | tar -xf - && \
@@ -16,7 +19,7 @@ RUN curl -sL https://sourceforge.net/projects/freepascal/files/Linux/$FPC_VERSIO
 
 COPY compile.sh /compile.sh
 ADD https://raw.githubusercontent.com/fsaintjacques/semver-tool/master/src/semver /usr/bin/semver
-RUN mkdir /code && chmod +x /usr/bin/semver
+RUN chmod +x /usr/bin/semver
 WORKDIR /code
 RUN find . -type f -print0 | xargs -0 dos2unix
 ENTRYPOINT ["/bin/bash", "-c"]

compile.sh

@@ -20,26 +20,31 @@ runOrFail() {
 	fi
 }
 
-runOrFail $(pwd)/compile_stub.sh "Failed to compile stub!"
+declare -a run_steps=(
+	"compile_stub.sh" "Failed to compile stub!"
+	"compile_vergen.sh" "Versions failed to compile"
+	"compile_imgui.sh" "Failed to compile ImGui!"
+	"compile_sources.sh" "Failed to compile FPC Sources!"
+	"compile_link.sh" "Failed linking!"
+	"compile_isogen.sh" "Failed to create ISO!"
+)
 
-#Generate .pas with versioning headers.
-runOrFail $(pwd)/compile_vergen.sh "Versions failed to compile"
-
-#Compile all .pas sources
-runOrFail $(pwd)/compile_sources.sh "Failed to compile FPC Sources!"
-
-#Link into a binary.
-runOrFail $(pwd)/compile_link.sh "Failed linking!"
-
-#Generate an ISO with GRUB as the Bootloader.
-runOrFail ./compile_isogen.sh "Failed to create ISO!"
+for ((i=0; i<${#run_steps[@]}; i+=2))
+do
+	if [ "$ERRCOUNT" -eq "0" ]
+	then
+			script=$(pwd)/"${run_steps[$i]}"
+			message="${run_steps[$i+1]}"
+			runOrFail "$script" "$message"
+	fi
+done
 
 #Call generate final artifacts based on failure or success of the above.
 if [ "$ERRCOUNT" -ne "0" ]
 then
-	./compile_finish.sh "failed"
+	. ./compile_finish.sh "failed"
 else
-	./compile_finish.sh "success"
+	. ./compile_finish.sh "success"
 fi
 
 cd ..

compile_imgui.sh

@@ -0,0 +1,90 @@
+#!/usr/bin/env bash
+echo " "
+echo "======================="
+echo " "
+echo "Compiling ImGui (cimgui)..."
+echo " "
+
+IMGUI_DIR=/cimgui
+IMGUI_SRC=$IMGUI_DIR/imgui
+BRIDGE_SRC=src/driver/video/imgui
+
+# Flags shared by all C/C++ compilation units:
+#   -m32              -> i386 target
+#   -ffreestanding    -> no implicit stdlib inclusion
+#   -fno-builtin      -> don't inline memcpy/memset/etc. so our stubs are used
+#   -O2               -> optimise for speed
+#   -ffunction-sections -fdata-sections -> allow --gc-sections in linker
+C_FLAGS="-m32 -ffreestanding -fno-builtin -O2 -ffunction-sections -fdata-sections"
+
+# Extra flags for C++ translation units (cimgui/imgui sources):
+#   -fno-exceptions         -> no stack-unwinding machinery
+#   -fno-rtti               -> no typeinfo / dynamic_cast
+#   -fno-use-cxa-atexit     -> don't emit __cxa_atexit calls for static dtors
+#   -fno-threadsafe-statics -> no guard-variable emission for local statics
+# NOTE: *not* -ffreestanding / -fno-builtin here — imgui includes <cmath> and
+#       other hosted headers that refuse to compile in freestanding mode.
+#       The object files are archived into a static lib and linked freestanding;
+#       any hosted-stdlib calls (malloc/free/sin/cos/…) resolve to crtshim.c.
+CPP_FLAGS="-m32 -O2 -ffunction-sections -fdata-sections -fno-exceptions -fno-rtti -fno-use-cxa-atexit -fno-threadsafe-statics -fno-stack-protector -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -DNDEBUG -DIMGUI_ENABLE_STB_TRUETYPE"
+
+INCLUDE="-I$IMGUI_DIR -I$IMGUI_SRC"
+
+echo "Compiling C runtime shim..."
+gcc $C_FLAGS $INCLUDE \
+    -c $BRIDGE_SRC/crtshim.c \
+    -o lib/imgui_crtshim.o || { echo "Failed: crtshim.c"; exit 1; }
+
+echo "Compiling render bridge..."
+# imgbridge is compiled as C++ so it sees cimgui.h function declarations
+# (C++ mode is required; the .c extension is overridden with -x c++)
+g++ $CPP_FLAGS $INCLUDE \
+    -x c++ \
+    -DCIMGUI_DEFINE_ENUMS_AND_STRUCTS \
+    -c $BRIDGE_SRC/imgbridge.c \
+    -o lib/imgui_bridge.o || { echo "Failed: imgbridge.c"; exit 1; }
+
+echo "Compiling cimgui wrapper..."
+g++ $CPP_FLAGS $INCLUDE \
+    -c $IMGUI_DIR/cimgui.cpp \
+    -o lib/imgui_cimgui.o || { echo "Failed: cimgui.cpp"; exit 1; }
+
+echo "Compiling imgui core..."
+g++ $CPP_FLAGS $INCLUDE \
+    -c $IMGUI_SRC/imgui.cpp \
+    -o lib/imgui_core.o || { echo "Failed: imgui.cpp"; exit 1; }
+
+echo "Compiling imgui draw..."
+g++ $CPP_FLAGS $INCLUDE \
+    -c $IMGUI_SRC/imgui_draw.cpp \
+    -o lib/imgui_draw.o || { echo "Failed: imgui_draw.cpp"; exit 1; }
+
+echo "Compiling imgui tables..."
+g++ $CPP_FLAGS $INCLUDE \
+    -c $IMGUI_SRC/imgui_tables.cpp \
+    -o lib/imgui_tables.o || { echo "Failed: imgui_tables.cpp"; exit 1; }
+
+echo "Compiling imgui widgets..."
+g++ $CPP_FLAGS $INCLUDE \
+    -c $IMGUI_SRC/imgui_widgets.cpp \
+    -o lib/imgui_widgets.o || { echo "Failed: imgui_widgets.cpp"; exit 1; }
+
+echo "Compiling imgui demo..."
+g++ $CPP_FLAGS $INCLUDE \
+    -c $IMGUI_SRC/imgui_demo.cpp \
+    -o lib/imgui_demo.o || { echo "Failed: imgui_demo.cpp"; exit 1; }
+
+echo "Archiving cimgui.a..."
+# NOTE: imgui_bridge.o and imgui_crtshim.o are NOT in the archive because
+# compile_link.sh already picks them up individually via find lib/ -name "*.o".
+# Including them here would cause duplicate symbol errors.
+ar rcs lib/cimgui.a \
+    lib/imgui_cimgui.o \
+    lib/imgui_core.o \
+    lib/imgui_draw.o \
+    lib/imgui_tables.o \
+    lib/imgui_widgets.o \
+    lib/imgui_demo.o || { echo "Failed: ar"; exit 1; }
+
+echo "ImGui compiled successfully."
+exit 0

compile_link.sh

@@ -14,4 +14,6 @@ done;
 objstring=lib/stub.o" "$objstring 
 echo "Object Files: "$objstring
 echo " "
-ld -m elf_i386 -s --gc-sections -Tlinker.script -o bin/kernel.bin $objstring
+LIBGCC=$(gcc -m32 -print-libgcc-file-name)
+ld -m elf_i386 -s --gc-sections -Tlinker.script -o bin/kernel.bin $objstring \
+    --start-group lib/cimgui.a $LIBGCC --end-group

compile_sources.sh

@@ -4,4 +4,4 @@ echo "======================="
 echo " "
 echo "Compiling FPC Sources..."
 echo " "
-fpc -Aelf -gw -g -gl -n -vlewn -O3 -Op3 -Si -Sc -Sg -Xd -CX -XXs -CfSSE -CfSSE2 -Rintel -Pi386 -Tlinux -FElib/ -Fusrc/* -Fusrc/driver/* -Fusrc/driver/net/* src/kernel.pas
+fpc -Aelf -gw -g -gl -n -vlewn -O3 -Op3 -Si -Sc -Sg -Xd -CX -XXs -CfSSE -CfSSE2 -Rintel -Pi386 -Tlinux -FElib/ -Fusrc/* -Fusrc/driver/* -Fusrc/driver/net/* -Fusrc/driver/video/* -Fusrc/driver/video/imgui/* src/kernel.pas

docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.9"
 services:
   builder:
     build: .

dockerout.txt

@@ -0,0 +1,20 @@
+4023:CIMGUI_API float igGetWindowDpiScale(void);
+4081:CIMGUI_API const ImVec4_c* igGetStyleColorVec4(ImGuiCol idx);
+4082:CIMGUI_API ImVec2_c igGetCursorScreenPos(void);
+4084:CIMGUI_API ImVec2_c igGetContentRegionAvail(void);
+4085:CIMGUI_API ImVec2_c igGetCursorPos(void);
+4086:CIMGUI_API float igGetCursorPosX(void);
+4087:CIMGUI_API float igGetCursorPosY(void);
+4091:CIMGUI_API ImVec2_c igGetCursorStartPos(void);
+4350:CIMGUI_API void igBeginDisabled(bool disabled);
+4372:CIMGUI_API ImVec2_c igGetItemRectMin(void);
+4373:CIMGUI_API ImVec2_c igGetItemRectMax(void);
+4374:CIMGUI_API ImVec2_c igGetItemRectSize(void);
+4377:CIMGUI_API ImDrawList* igGetBackgroundDrawList(ImGuiViewport* viewport);
+4378:CIMGUI_API ImDrawList* igGetForegroundDrawList_ViewportPtr(ImGuiViewport* viewport);
+4387:CIMGUI_API ImVec2_c igCalcTextSize(const char* text,const char* text_end,bool hide_text_after_double_hash,float wrap_width);
+4388:CIMGUI_API ImVec4_c igColorConvertU32ToFloat4(ImU32 in);
+4405:CIMGUI_API bool igIsMouseDoubleClicked_Nil(ImGuiMouseButton button);
+5092:CIMGUI_API ImDrawList* igGetForegroundDrawList_WindowPtr(ImGuiWindow* window);
+5161:CIMGUI_API void igBeginDisabledOverrideReenable(void);
+5244:CIMGUI_API bool igIsMouseDoubleClicked_ID(ImGuiMouseButton button,ImGuiID owner_id);

linker.script

@@ -34,4 +34,14 @@ SECTIONS
   }
   end = .; _end = .; __end = .;
   kernel_end = .;
+
+  /DISCARD/ : {
+    *(.init_array*)
+    *(.fini_array*)
+    *(.ctors)
+    *(.dtors)
+    *(.eh_frame*)
+    *(.gcc_except_table*)
+    *(.note.GNU-stack)
+  }
 }

readme.md

@@ -13,8 +13,8 @@ We welcome everyone to give building/breaking/fixing/shooting Asuro a go, feel f
     I don't think this needs an explaination.
 * [VSCode (Optional, but highly recommended)](https://code.visualstudio.com/)
     Visual Studio code is our IDE of choice, and we have a number of recommended plugins.
-    * [C# Plugin by Microsoft](https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csharp)
-        This plugin gives you the ability to use the 'coreclr' task type, allowing the automatic launching of virtualbox with the resulting image generated during compilation of Asuro.
+    * [PowerShell Plugin by Microsoft](https://marketplace.visualstudio.com/items?itemName=ms-vscode.powershell)
+        This plugin gives you the ability to use the 'PowerShell' task type, allowing the automatic launching of virtualbox with the resulting image generated during compilation of Asuro.
 * [VirtualBox](https://www.virtualbox.org/)
     Virtualbox is our Virtualisation environment of choice, don't ask why, it just is.
 
@@ -27,7 +27,7 @@ We welcome everyone to give building/breaking/fixing/shooting Asuro a go, feel f
 3. Install Docker for Windows.
 4. Install Git for Windows.
 5. Install VSCode & the listed plugins.
-6. Install VirtualBox.
+6. Install VirtualBox (v7+).
 7. Clone this repository.
 8. Run the following command in the root of the repo to build the docker image:
     ```powershell
@@ -50,32 +50,29 @@ We welcome everyone to give building/breaking/fixing/shooting Asuro a go, feel f
     ```xml
     <Machine uuid="{7d395c96-891c-4139-b77d-9b6b144b0b93}" name="Asuro" OSType="Linux" snapshotFolder="Snapshots" lastStateChange="2021-06-20T20:33:07Z">
     ```
-    Copy the uuid, in our case `7d395c96-891c-4139-b77d-9b6b144b0b93` and replace the uuid found in `.vscode\launch.json` under `args`, so that it looks something like this:
+    Copy the uuid, in our case `7d395c96-891c-4139-b77d-9b6b144b0b93` & create a `localenv.json` file in the project root with the following content:
     ```json
     {
-        "configurations": [
-            {
-                "name":"Run",
-                "request": "launch",
-                "type": "coreclr",
-                "preLaunchTask": "Build",
-                "program": "VBoxSDL",
-                "args": [
-                    "--comment", 
-                    "Asuro", 
-                    "--startvm", 
-                    "<YOUR UUID HERE>"
-                ],
-                "cwd": "${workspaceFolder}",
-                "console": "internalConsole",
-                "internalConsoleOptions": "neverOpen"
-            }
-        ]
+        "VirtualBox":{
+            "MachineName":"<YOUR_UUID_OR_MACHINE_NAME>"
+        }
     }
     ```
     This will allow VSCode to automatically launch VirtualBox once Asuro has been compiled.
+    
+    You can also enable the serial adapter "COM1" in mode "Raw File", give it a path, and provide this path in the `localenv.json` as follows:
+    ```json
+    {
+        "VirtualBox" : {
+            "MachineName": "<YOUR_UUID_OR_MACHINE_NAME>",
+            "LogLocation": "Fully\\Qualified\\Path\\To\\Your\\Log\\File"
+        }
+    }
+    ```
+    This will allow you to see the console output from Asuro in your host terminal.
 13. Open your project folder in VSCode, use CTRL+SHIFT+B to build & F5 to build + run in VBox.
 14. Congratulations! You can now play with Asuro!
 
-### Gotchas
+### Notes & Gotchas
+- The above process has been updated to be compatible with VirtualBox 7+, in which VBoxSDL was removed and vboxmanage should be used in its place. A small wrapper powershell script is used to achieve this.
 - It was noted that Windows builds above `20H2` seem to have issues installing WSL2. We may have to wait for a patch from Microsoft to fix this. Our devs are currently using build `20H2`.

src/console.pas

@@ -838,6 +838,18 @@ const
 	MAX_WINDOWS = 255; //< Maximum number of Windows open.
     DefaultWND  = 0;   //< The Window assigned for output when no Window is specified. (Default).
 
+type
+    TWNDCaptureCallback = procedure(s: pchar);
+
+var
+    WND_CaptureActive   : boolean = false;
+    WND_CaptureHWND     : uint32 = 0;
+    WND_CaptureBuf      : array[0..511] of char;
+    WND_CaptureBufIdx   : uint32 = 0;
+    WND_CaptureCallback : TWNDCaptureCallback = nil;
+
+procedure flushCapture;
+
 implementation
 
 uses
@@ -1776,14 +1788,15 @@ var
    fb: puint32;
 
 Begin
+     Ready:= False;
      fb:= puint32(uint32(multibootinfo^.framebuffer_addr));
      Console_Properties.Width:= multibootinfo^.framebuffer_width;
      Console_Properties.Height:= multibootinfo^.framebuffer_height;
      Console_Properties.BitsPerPixel:= multibootinfo^.framebuffer_bpp;
      Console_Properties.MAX_CELL_X:= (Console_Properties.Width div 8) - 1;
      Console_Properties.MAX_CELL_Y:= (Console_Properties.Height div 16) - 1;
-     If Console_Properties.BitsPerPixel <> 16 then while true do begin
-
+     If Console_Properties.BitsPerPixel <> 16 then begin
+        exit;
      end;
      kpalloc(uint32(fb));
      keyboard.hook(@keyhook);
@@ -2258,6 +2271,7 @@ var
    x,y: Byte;
 
 begin
+     if WND_CaptureActive and (WND = WND_CaptureHWND) then exit;
      if WindowManager.Windows[WND] <> nil then begin
         for y:=0 to Console_Properties.MAX_CELL_Y do begin
             for x:=0 to Console_Properties.MAX_CELL_X do begin
@@ -2418,8 +2432,26 @@ begin
      console.writeintlnexWND(i, Console_Properties.Default_Attribute, WND);
 end;
 
+procedure flushCapture;
+begin
+    if WND_CaptureActive and (WND_CaptureCallback <> nil) and (WND_CaptureBufIdx > 0) then begin
+        WND_CaptureBuf[WND_CaptureBufIdx] := #0;
+        WND_CaptureCallback(@WND_CaptureBuf[0]);
+        WND_CaptureBufIdx := 0;
+        WND_CaptureBuf[0] := #0;
+    end;
+end;
+
 procedure writecharexWND(character: char; attributes: uint32; WND : uint32); 
 begin
+    if WND_CaptureActive and (WND = WND_CaptureHWND) and (WND_CaptureCallback <> nil) then begin
+        if WND_CaptureBufIdx < 511 then begin
+            WND_CaptureBuf[WND_CaptureBufIdx] := character;
+            inc(WND_CaptureBufIdx);
+            WND_CaptureBuf[WND_CaptureBufIdx] := #0;
+        end;
+        exit;
+    end;
     if WindowManager.Windows[WND] <> nil then begin
         WindowManager.Windows[WND]^.Buffer[WindowManager.Windows[WND]^.Cursor.Y][WindowManager.Windows[WND]^.Cursor.X].Character:= character;
         WindowManager.Windows[WND]^.Buffer[WindowManager.Windows[WND]^.Cursor.Y][WindowManager.Windows[WND]^.Cursor.X].Attributes:= attributes;
@@ -2602,6 +2634,13 @@ end;
 
 procedure backspaceWND(WND : uint32);
 begin
+     if WND_CaptureActive and (WND = WND_CaptureHWND) then begin
+        if WND_CaptureBufIdx > 0 then begin
+            dec(WND_CaptureBufIdx);
+            WND_CaptureBuf[WND_CaptureBufIdx] := #0;
+        end;
+        exit;
+     end;
      if WindowManager.Windows[WND] <> nil then begin
         Dec(WindowManager.Windows[WND]^.Cursor.X);
         writecharWND(' ', WND);
@@ -2658,6 +2697,13 @@ end;
 
 procedure _safeincrement_y_WND(WND : uint32);
 begin
+     if WND_CaptureActive and (WND = WND_CaptureHWND) and (WND_CaptureCallback <> nil) then begin
+        WND_CaptureBuf[WND_CaptureBufIdx] := #0;
+        WND_CaptureCallback(@WND_CaptureBuf[0]);
+        WND_CaptureBufIdx := 0;
+        WND_CaptureBuf[0] := #0;
+        exit;
+     end;
      if WindowManager.Windows[WND] <> nil then begin
         WindowManager.Windows[WND]^.Cursor.Y:= WindowManager.Windows[WND]^.Cursor.Y+1;
         if WindowManager.Windows[WND]^.Cursor.Y > WindowManager.Windows[WND]^.WND_H-1 then begin

src/cpu.pas

@@ -291,6 +291,28 @@ begin
     end;
 end;
 
+procedure enableAVX();
+begin
+    if CPUID.Capabilities1^.AVX then begin
+        asm
+            PUSH EAX
+            PUSH ECX
+            PUSH EDX
+            XOR ECX, ECX
+            db $0F
+            db $01
+            db $D0
+            OR EAX, 7
+            db $0F
+            db $01
+            db $D1
+            POP EDX
+            POP ECX
+            POP EAX
+        end;
+    end;
+end;
+
 procedure init();
 begin
     terminal.registerCommand('CPU', @Terminal_Command_CPU, 'CPU Info.');
@@ -300,6 +322,7 @@ begin
     getCPUCapabilities;
     getCPUClockSpeed;
     enableSSE;
+    enableAVX;
 end;
 
 end.

src/driver/hid/mouse.pas

@@ -49,8 +49,12 @@ type
         y : sint32;
     end;
 
+    { Mouse hook callback: receives absolute position and button states }
+    TMouseHook = procedure(x, y: sint32; lmb, rmb, mmb: boolean);
+
 procedure init();
 procedure DrawCursor;
+procedure setHook(h: TMouseHook);
 
 implementation
 
@@ -67,6 +71,7 @@ var
     LMouseDownPos : TMousePos;
     LMouseDown : Boolean;
     RMouseDown : Boolean;
+    MouseHookCB : TMouseHook = nil;
 
 procedure DrawCursor;
 var
@@ -174,43 +179,38 @@ begin
                 if Current.y > (Console.getConsoleProperties^.Height-8) then Current.y:= (Console.getConsoleProperties^.Height-8);
             end;
             Cycle:= 0;
-            if Packet.LMB_Down then begin
-                if not LMouseDown then begin
-                    LMouseDown:= true;
-                    LMouseDownPos.x:= Current.x;
-                    LMouseDownPos.y:= Current.y;
-                    //MouseDownEvent
-                    console._mouseDown();
-                end;
+            { Track button transitions }
+            if Packet.LMB_Down and (not LMouseDown) then begin
+                LMouseDown:= true;
+                LMouseDownPos.x:= Current.x;
+                LMouseDownPos.y:= Current.y;
             end;
-            if not Packet.LMB_Down then begin
-                if LMouseDown then begin
-                    If (Current.x = LMouseDownPos.x) and (Current.y = LMouseDownPos.y) then begin
-                        Console._MouseClick(true);
-                    end;
-                    //MouseUpEvent
-                    Console._MouseUp();
-                    LMouseDown:= false;
-                end;
+            if (not Packet.LMB_Down) and LMouseDown then
+                LMouseDown:= false;
+            if Packet.RMB_Down and (not RMouseDown) then begin
+                RMouseDown:= true;
+                RMouseDownPos.x:= Current.x;
+                RMouseDownPos.y:= Current.y;
             end;
-            if Packet.RMB_Down then begin
-                if not RMouseDown then begin
-                    RMouseDown:= true;
-                    RMouseDownPos.x:= Current.x;
-                    RMouseDownPos.y:= Current.y;
-                end;
-            end;
-            
-            if not Packet.RMB_Down then begin
-                if RMouseDown then begin
-                    if (Current.x = RMouseDownPos.x) and (Current.y = RMouseDownPos.y) then begin
-                        Console._MouseClick(false);
-                    end;
-                end;
+            if (not Packet.RMB_Down) and RMouseDown then
                 RMouseDown:= false;
+
+            { Dispatch to hook or console }
+            if MouseHookCB <> nil then
+                MouseHookCB(Current.x, Current.y, Packet.LMB_Down, Packet.RMB_Down, Packet.MMB_Down)
+            else begin
+                if Packet.LMB_Down and (not LMouseDown) then console._mouseDown();
+                if (not Packet.LMB_Down) and LMouseDown then begin
+                    if (Current.x = LMouseDownPos.x) and (Current.y = LMouseDownPos.y) then
+                        Console._MouseClick(true);
+                    Console._MouseUp();
+                end;
+                if (not Packet.RMB_Down) and RMouseDown then begin
+                    if (Current.x = RMouseDownPos.x) and (Current.y = RMouseDownPos.y) then
+                        Console._MouseClick(false);
+                end;
+                console.setMousePosition(Current.x, Current.y);
             end;
-            
-            console.setMousePosition(Current.x, Current.y);
         end;
     end;
 end;
@@ -242,6 +242,11 @@ begin
     pop_trace;
 end;
 
+procedure setHook(h: TMouseHook);
+begin
+    MouseHookCB := h;
+end;
+
 procedure init();
 var
     devid : TDeviceIdentifier;

src/driver/storage/vfs.pas

@@ -92,6 +92,7 @@ var
     Root              : PVFSObject;
     CurrentDirectory  : pchar = nil;
     PushPopDirectory  : PLinkedListBase;
+    MountDepth        : uint32 = 0;
 
 procedure init();
 Function OpenFile(Filename : pchar; OpenMode : TOpenMode; WriteMode : TWriteMode; Lock : Boolean; Error : PError) : TFileHandle;
@@ -104,6 +105,7 @@ function GetDirectories(Handle : uint32; Path : pchar) : PHashMap;
 function PathValid(Path : pchar) : TIsPathValid;
 function changeDirectory(Path : pchar) : TIsPathValid;
 function getWorkingDirectory : pchar;
+function GetDirectoryListing(Path : pchar) : PHashMap;
 
 //VFS Functions
 function newVirtualDirectory(Path : pchar) : TError;
@@ -288,6 +290,7 @@ begin
             NewObj:= PVFSObject(hashmap.get(ht, item));                                            
             if NewObj = nil then begin                                                              
                 GetObjectFromPath:= nil;
+                STRLL_Free(SplitPath);
                 tracer.push_trace('vfs.GetObjectFromPath.shortexit_1');
                 exit;
             end;                                                                                    
@@ -304,6 +307,7 @@ begin
         end;
     end;                                                                                           
     GetObjectFromPath:= Obj;
+    STRLL_Free(SplitPath);
     tracer.push_trace('vfs.GetObjectFromPath.exit');
 end;
 
@@ -348,7 +352,17 @@ begin
                 GetDirectoryListing:= nil;
             end; 
             otMOUNT:begin
-                GetDirectoryListing:= GetDirectoryListing(PVFSMount(Obj^.Reference)^.Path);
+                { Safety: cap mount-follow depth to prevent infinite recursion
+                  from circular mounts.  Use a simple static counter. }
+                if MountDepth < 16 then begin
+                    Inc(MountDepth);
+                    GetDirectoryListing:= GetDirectoryListing(PVFSMount(Obj^.Reference)^.Path);
+                    Dec(MountDepth);
+                end else
+                    GetDirectoryListing:= nil;
+            end;
+            else begin
+                GetDirectoryListing:= nil;
             end;
         end;
     end else begin
@@ -420,7 +434,7 @@ begin
 
     NewObj^.Reference:= void(NewDev);
 
-    hashmap.add(ht, stringCopy(DeviceName), void(NewDev));
+    hashmap.add(ht, stringCopy(DeviceName), void(NewObj));
 end;
 
 { Filesystem Functions }

src/driver/video/doublebuffer.pas

@@ -0,0 +1,116 @@
+//  Copyright 2021 Kieron Morris
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//  http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+
+{ 
+	Driver->Video->Doublebuffer - Implements a very basic double buffer, tested with VESA drivers.
+	
+	@author(Kieron Morris <[email protected]>)
+}
+unit doublebuffer;
+
+interface
+
+uses
+    lmemorymanager, tracer, videotypes, serial, util;
+
+//Init the driver, and register with the video interface in a state ready for execution.
+procedure init(Register : FRegisterDriver);
+
+implementation
+
+function allocateBackBuffer(Width : uint32; Height : uint32; BitsPerPixel : uint8) : uint64;
+begin
+    tracer.push_trace('doublebuffer.allocateBackBuffer.enter');
+    //This doesn't currently work... Needs a rework of lmemorymanager
+    allocateBackBuffer:= uint64(klalloc((Width * Height) * BitsPerPixel));
+    tracer.push_trace('doublebuffer.allocateBackBuffer.exit');
+end;
+
+procedure initBackBuffer(VInterface : PVideoInterface; Width : uint32; Height : uint32; BitsPerPixel : uint8);
+begin
+    tracer.push_trace('doublebuffer.initBackBuffer.enter');
+    if not(VInterface^.BackBuffer.Initialized) then begin
+        VInterface^.BackBuffer.Location:= allocateBackBuffer(Width, Height, BitsPerPixel);
+        if (VInterface^.BackBuffer.Location <> 0) then begin
+            VInterface^.BackBuffer.Width:= Width;
+            VInterface^.BackBuffer.Height:= Height;
+            VInterface^.BackBuffer.BitsPerPixel:= BitsPerPixel;
+            VInterface^.BackBuffer.Initialized:= True;
+        end;
+    end;
+    tracer.push_trace('doublebuffer.initBackBuffer.exit');
+end;
+
+procedure Flush(FrontBuffer : PVideoBuffer; BackBuffer : PVideoBuffer);
+var
+    Back,Front : uint32;
+    Count64 : uint32;
+
+begin
+    //tracer.push_trace('doublebuffer.Flush.enter');
+    if not(BackBuffer^.Initialized) then exit;
+    if ((FrontBuffer^.Width > BackBuffer^.Width) or (FrontBuffer^.Height > BackBuffer^.Height)) then exit;
+    Back:= BackBuffer^.Location;
+    Front:= FrontBuffer^.Location;
+    { Number of 64-byte blocks: total_bytes / 64 = (W * H * BPP/8) / 64 }
+    Count64:= ( BackBuffer^.Width * BackBuffer^.Height * BackBuffer^.BitsPerPixel) div 512;
+    if Count64 = 0 then exit;
+    { Bulk SSE copy: 4 x MOVAPS (64 bytes) per iteration.
+      4x fewer loop iterations than the old per-16-byte function-call loop. }
+    asm
+        PUSH ESI
+        PUSH EDI
+        MOV ESI, Back
+        MOV EDI, Front
+        MOV ECX, Count64
+    @sseloop:
+        MOVAPS XMM0, [ESI]
+        MOVAPS XMM1, [ESI + 16]
+        MOVAPS XMM2, [ESI + 32]
+        MOVAPS XMM3, [ESI + 48]
+        MOVAPS [EDI], XMM0
+        MOVAPS [EDI + 16], XMM1
+        MOVAPS [EDI + 32], XMM2
+        MOVAPS [EDI + 48], XMM3
+        ADD ESI, 64
+        ADD EDI, 64
+        DEC ECX
+        JNZ @sseloop
+        POP EDI
+        POP ESI
+    end;
+    //tracer.push_trace('doublebuffer.Flush.exit');
+end;
+
+function enable(VideoInterface : PVideoInterface) : boolean;
+begin
+    tracer.push_trace('doublebuffer.enable.enter');
+    enable:= false;
+    initBackBuffer(VideoInterface, VideoInterface^.FrontBuffer.Width, VideoInterface^.FrontBuffer.Height, VideoInterface^.FrontBuffer.BitsPerPixel);
+    if VideoInterface^.BackBuffer.Initialized then begin
+        VideoInterface^.DefaultBuffer:= @VideoInterface^.BackBuffer;
+        VideoInterface^.DrawRoutines.Flush:= @Flush;
+        enable:= true;
+    end;
+    tracer.push_trace('doublebuffer.enable.exit');
+end;
+
+procedure init(Register : FRegisterDriver);
+begin
+    tracer.push_trace('doublebuffer.init.enter');
+    Register('BASIC_DOUBLE_BUFFER', @enable);
+    tracer.push_trace('doublebuffer.init.exit');
+end;
+
+end.