Contain retained OpenGL runtime sources

CMakeLists.txt

@@ -221,8 +221,38 @@ endif()
 
 if(PP_BUILD_APP)
     if(WIN32)
+        add_library(pp_legacy_renderer_gl OBJECT
+            ${PP_LEGACY_RENDERER_GL_SOURCES})
+        target_link_libraries(pp_legacy_renderer_gl
+            PUBLIC
+                pp_project_options
+            PRIVATE
+                pp_renderer_api
+                pp_project_warnings)
+        if(TARGET pp_renderer_gl)
+            target_link_libraries(pp_legacy_renderer_gl PRIVATE pp_renderer_gl)
+        endif()
+        target_include_directories(pp_legacy_renderer_gl
+            PUBLIC
+                ${PP_LEGACY_INCLUDE_DIRS})
+        target_compile_definitions(pp_legacy_renderer_gl
+            PUBLIC
+                ENUM_BITFIELDS_NOT_SUPPORTED
+                UNICODE
+                _UNICODE
+                _CRT_SECURE_NO_WARNINGS
+                _SCL_SECURE_NO_WARNINGS
+                _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
+                _SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING
+                _CONSOLE
+                WITH_CURL=1)
+        set_target_properties(pp_legacy_renderer_gl PROPERTIES
+            VS_GLOBAL_CharacterSet "Unicode")
+        target_precompile_headers(pp_legacy_renderer_gl PRIVATE src/pch.h)
+
         add_library(pp_legacy_engine STATIC
             ${PP_LEGACY_ENGINE_SOURCES}
+            $<TARGET_OBJECTS:pp_legacy_renderer_gl>
             ${PP_VENDOR_SOURCES})
 
         target_link_libraries(pp_legacy_engine

cmake/PanoPainterSources.cmake

@@ -9,19 +9,22 @@ set(PP_LEGACY_ENGINE_SOURCES
     src/canvas_actions.cpp
     src/canvas_layer.cpp
     src/event.cpp
-    src/font.cpp
     src/hmd.cpp
     src/image.cpp
     src/log.cpp
     src/mp4enc.cpp
-    src/rtt.cpp
     src/serializer.cpp
     src/settings.cpp
+    src/util.cpp
+    src/wacom.cpp
+)
+
+set(PP_LEGACY_RENDERER_GL_SOURCES
+    src/font.cpp
+    src/rtt.cpp
     src/shader.cpp
     src/shape.cpp
     src/texture.cpp
-    src/util.cpp
-    src/wacom.cpp
 )
 
 set(PP_LEGACY_APP_SOURCES

docs/modernization/build-inventory.md

@@ -10,7 +10,7 @@ Keep it updated as platform paths move to shared CMake targets.
 
 | Platform/Target | Current Entrypoint | Notes |
 | --- | --- | --- |
-| Windows desktop | Root `CMakeLists.txt`, preset `windows-msvc-default`; target preset `windows-vs2026-x64` retained for VS 2026 | Raw `.sln/.vcxproj` files removed on 2026-05-31; local machine currently uses Visual Studio 17 2022; `PanoPainter` now links through `pp_platform_windows` and `panopainter_app`, with Windows/vendor link dependencies owned by the platform shell, runtime payload deployment in `cmake/PanoPainterRuntime.cmake`, legacy rendering/canvas/asset/runtime sources contained by `pp_legacy_engine`, app orchestration/version metadata owned by `panopainter_app`, and app-specific modal/dialog/panel/canvas workflow nodes owned by `pp_panopainter_ui` |
+| Windows desktop | Root `CMakeLists.txt`, preset `windows-msvc-default`; target preset `windows-vs2026-x64` retained for VS 2026 | Raw `.sln/.vcxproj` files removed on 2026-05-31; local machine currently uses Visual Studio 17 2022; `PanoPainter` now links through `pp_platform_windows` and `panopainter_app`, with Windows/vendor link dependencies owned by the platform shell, runtime payload deployment in `cmake/PanoPainterRuntime.cmake`, retained OpenGL runtime sources contained by `pp_legacy_renderer_gl` and folded into `pp_legacy_engine`, legacy canvas/asset/runtime sources contained by `pp_legacy_engine`, app orchestration/version metadata owned by `panopainter_app`, and app-specific modal/dialog/panel/canvas workflow nodes owned by `pp_panopainter_ui` |
 | Windows AppX | `PanoPainterPackage/Package.appxmanifest`, `.wapproj` referenced by solution | Distribution packaging |
 | macOS | `PanoPainter-OSX/` project files and `Info.plist` | Uses `NSOpenGLView` today |
 | iOS | `PanoPainter/Info.plist`, related Apple sources | Uses OpenGL ES today |
@@ -402,6 +402,10 @@ Known warnings after the current CMake app build:
   runtime sources for now, so it concentrates existing JPEG, SQLite, Yoga,
   poly2tri, Wacom, GLM/base64, and legacy canvas/render warnings until those
   dependencies move to cleaner component or vcpkg ownership.
+- `pp_legacy_renderer_gl` is an object-library containment boundary because
+  the retained OpenGL runtime classes still include legacy app/engine headers
+  and are still consumed directly by canvas and UI classes. It should become a
+  normal backend library once those call sites depend on `pp_renderer_api`.
 - `pp_panopainter_ui` currently surfaces existing legacy `Node`/`Serializer`
   header and static-analysis warnings while it still depends on
   `pp_legacy_app`; these should be reduced as the UI core/app UI boundary is

docs/modernization/roadmap.md

@@ -147,9 +147,13 @@ option targets exist. The Windows desktop app builds through CMake as
 `PanoPainter` is only the executable/resource wrapper; Windows and vendor link
 dependencies now belong to the platform shell target, and Windows runtime
 payload deployment lives behind `cmake/PanoPainterRuntime.cmake`.
-`pp_legacy_engine` now contains the retained legacy rendering, canvas,
+`pp_legacy_engine` now contains the retained legacy canvas, asset/file, brush,
-asset/file, brush, tablet, video, serialization, and low-level runtime sources
+tablet, video, serialization, and low-level runtime sources as an interim
-as an interim containment boundary while pure replacement components take over.
+containment boundary while pure replacement components take over.
+`pp_legacy_renderer_gl` now owns the retained OpenGL runtime implementations
+for `Font`, `RTT`, `Shader`, `Shape`, `Texture2D`, `TextureCube`, `Sampler`,
+and `TextureManager` as an object-library boundary folded into the retained
+engine until the renderer API inversion is complete.
 `panopainter_app` is now a real static target that owns app orchestration
 sources, app version metadata, and version-header generation.
 `pp_panopainter_ui` now owns app-specific modal, dialog, panel, canvas,