Share retained utility GL dispatch bridges

docs/modernization/roadmap.md

@@ -1265,9 +1265,11 @@ readback also goes through the tested framebuffer-backed texture readback
 dispatch instead of direct `glGetTexImage`. Grid depth-state snapshots and sun
 overlay viewport queries now also use tested backend query dispatch instead of
 direct state reads.
-Legacy `util.cpp` OpenGL error naming and `gl_state` save/restore now delegate
-error codes, state queries, framebuffer targets, texture binding targets, and
-active texture units to `pp_renderer_gl`.
+Legacy `util.cpp` OpenGL error naming, framebuffer-to-texture copy helper, and
+`gl_state` save/restore now delegate error codes, state queries, framebuffer
+targets, texture binding targets, active texture units, shader program use, and
+sampler binding to `pp_renderer_gl` through the shared retained bridge headers
+instead of owning local raw OpenGL callbacks.
 `NodeStrokePreview` brush preview rendering now delegates depth/scissor/blend
 state, tested viewport/clear-color query dispatch, clear-color restore, active
 texture unit execution, fallback 2D texture unbinds, 2D texture targets, copy
@@ -2585,6 +2587,11 @@ Results:
   `legacy_gl_shader_dispatch`, removing duplicated raw shader/program/uniform
   callback ownership from `src/shader.cpp` while shader-program ownership
   remains retained under DEBT-0036.
+- Retained `gl_state` save/restore and `copy_framebuffer_to_texture_target`
+  now reuse `legacy_ui_gl_dispatch`, `legacy_gl_framebuffer_dispatch`,
+  `legacy_gl_shader_dispatch`, and `legacy_gl_sampler_dispatch`, removing the
+  local raw state/copy callback cluster from `src/util.cpp` while renderer
+  state and framebuffer-copy execution remain retained under DEBT-0036.
 - Canvas draw-merge shader-blend selection now consumes the extracted
   `pp_paint_renderer` stroke composite planner for current layer and primary
   brush blend modes, while preserving legacy OpenGL compositing execution under