Move OpenGL shape draw mappings

docs/modernization/roadmap.md

@@ -390,9 +390,11 @@ OpenGL capability detection for framebuffer fetch, map-buffer alignment, and
 float texture support. It also owns the OpenGL texture upload-type mapping used
 by legacy `Texture2D` and `RTT` creation, plus image channel-count to texture
 format mapping for `Texture2D` image uploads and framebuffer status naming for
-`RTT` diagnostics. The legacy app delegates extension, upload-format, and
-framebuffer diagnostic interpretation to that backend library, but the existing
-renderer classes are not yet fully behind the renderer interfaces.
+`RTT` diagnostics. Mesh index-type and primitive-mode decisions used by legacy
+`Shape` drawing also live in `pp_renderer_gl`. The legacy app delegates
+extension, upload-format, framebuffer diagnostic, and mesh draw-mode
+interpretation to that backend library, but the existing renderer classes are
+not yet fully behind the renderer interfaces.
 
 Implementation tasks:
 
@@ -633,7 +635,8 @@ Results:
   alignment, desktop GL core float support, GLES float/half-float extensions,
   WebGL exclusion behavior, upload types for RGBA8/RGBA16F/RGBA32F internal
   formats, image channel-count format mapping including invalid counts, and
-  framebuffer status names.
+  framebuffer status names, plus Shape index-type and fill/stroke primitive
+  mode mapping.
 - PowerShell analyze automation returns JSON summaries and includes the shader
   validation target.
 - `windows-msvc-vcpkg-headless` configured through the Visual Studio bundled