Route paint render state through GL backend

docs/modernization/roadmap.md

@@ -1108,9 +1108,17 @@ active texture units to `pp_renderer_gl`.
 state, viewport/clear-color queries, active texture unit execution, fallback
 2D texture unbinds, 2D texture targets, copy targets, sampler filters/wraps,
 and destination-feedback copy/fetch decisions to `pp_renderer_gl` and
-`pp_paint_renderer`. Retained `Canvas` stroke/thumbnail paths and `NodeCanvas`
+`pp_paint_renderer`. Its live stroke-mixer and brush-preview viewport,
+scissor, and depth/blend state changes now also execute through tested
+`pp_renderer_gl` dispatch with only local OpenGL adapter endpoints retained.
+Retained `Canvas` stroke/thumbnail/object/export paths and `NodeCanvas`
 panorama rendering use the same tested active-texture dispatch for their
-texture-unit switches.
+texture-unit switches, and their live viewport, scissor, and generic
+depth/blend/scissor capability changes now route through the same backend
+dispatch contracts.
+Desktop HMD eye rendering now routes eye framebuffer viewport changes through
+the tested `pp_renderer_gl` viewport dispatch while platform VR SDK bridges
+remain isolated for later platform-shell extraction.
 Legacy `Texture2D`, `TextureManager`, `Sampler`, and `RTT` public headers no
 longer expose raw OpenGL enum defaults; default texture formats, sampler
 filters/wraps, and render-target formats are resolved through backend-owned
@@ -2005,6 +2013,8 @@ Results:
   blend/depth state snapshots and restores, depth clears, active texture units,
   and fallback 2D texture unbinds through the renderer GL backend mapping;
   platform VR SDK bridges remain isolated for later platform-shell extraction.
+  Eye framebuffer viewport execution in the retained HMD path also routes
+  through tested `pp_renderer_gl` viewport dispatch.
 - Canvas mode overlay, mask, and transform paths now route generic OpenGL
   blend/depth state, active texture units, 2D framebuffer-to-texture copy
   dispatch, RGBA8 readback formats, and RTT-backed transform history region
@@ -2013,6 +2023,8 @@ Results:
   viewport/clear/blend/depth/scissor state, color clears, active texture units,
   fallback 2D texture unbinds, 2D framebuffer-to-texture copy dispatch, and
   RGBA8 render-target formats through the renderer GL backend mapping.
+  Its live viewport and generic blend/depth/scissor capability changes now
+  execute through tested `pp_renderer_gl` dispatch adapters.
 - Canvas resource setup now routes stroke-buffer RGBA8/RGBA16F/RGBA32F
   formats, flood-fill texture upload format/type, brush/stencil/mix sampler
   filters and wraps, and cube-strip import channel formats through the renderer
@@ -2021,7 +2033,8 @@ Results:
 - Early canvas draw helpers now route pick readbacks, stroke mixer depth/scissor
   and blend state, saved viewport/clear-state queries, active texture units,
   fallback 2D texture unbinds, and stroke background copy targets through the
-  renderer GL backend mapping.
+  renderer GL backend mapping. Stroke mixer viewport/scissor execution also
+  routes through the tested backend dispatch contract.
 - Canvas stroke commit now routes saved viewport/clear/blend state, history
   readbacks, active texture units, fallback 2D texture unbinds, and layer
   compositing copy targets through the renderer GL backend mapping; the
@@ -2062,6 +2075,10 @@ Results:
   framebuffer copy targets, and depth renderbuffer allocation plus framebuffer
   depth attach/detach through tested renderer GL backend dispatch contracts;
   `src/canvas.cpp` no longer contains raw `GL_*` constants.
+- Retained Canvas, NodeCanvas, NodeStrokePreview, and HMD viewport/scissor/
+  capability execution now compiles through the renderer GL backend dispatch
+  adapters with `pp_legacy_paint_document`, `pp_panopainter_ui`, and
+  `panopainter_app`.
 - Windows desktop OpenGL context creation now consumes a tested
   `windows_wgl_core_context_3_3_config()` catalog from `pp_renderer_gl`, moving
   the active WGL context/pixel-format attribute literals out of the platform