Map render pass clear masks to OpenGL

docs/modernization/build-inventory.md

@@ -200,7 +200,8 @@ Known local toolchain state:
   render-target texture parameters, texture/renderbuffer targets, depth format,
   framebuffer targets, binding queries, attachment points, and completion
   status used by `RTT::create` and framebuffer bind/restore paths, plus RTT
-  clear color/depth masks and color-write-mask query tokens. `RTT` no longer
+  clear color/depth masks, renderer API render-pass color/depth/stencil
+  clear-mask mapping, and color-write-mask query tokens. `RTT` no longer
   spells GL enum names directly. It also
   validates renderer API primitive-topology to OpenGL draw-mode mapping, Shape
   index-type, fill/stroke primitive-mode, buffer target, static upload usage,

docs/modernization/roadmap.md

@@ -454,8 +454,9 @@ to OpenGL token mapping, plus the default
 render-target texture parameters, texture/renderbuffer targets, depth format,
 framebuffer targets, binding queries, attachment points, and completion status
 used by `RTT::create` and framebuffer bind/restore paths, also live in
-`pp_renderer_gl`. RTT clear color/depth masks and color-write-mask query tokens
-also live in `pp_renderer_gl`. `RTT` no longer spells GL enum names directly.
+`pp_renderer_gl`. RTT clear color/depth masks, renderer API render-pass
+color/depth/stencil clear-mask mapping, and color-write-mask query tokens also
+live in `pp_renderer_gl`. `RTT` no longer spells GL enum names directly.
 Renderer API primitive-topology to OpenGL draw-mode mapping, mesh index-type
 and primitive-mode decisions used by legacy `Shape` drawing, plus Shape buffer
 targets, static upload usage, and vertex attribute component/normalization