[Fix] (MG_State/MG_Impl/MG_Backend): render Flywheel instanced+indirect on both backends

Create 6 / Flywheel 1.0.6 now renders correctly with both flywheel:instancing
and flywheel:indirect on DirectGLES and DirectVulkan (verified in-game on
Adreno 830: waterwheels and cogwheels solid, animated, correct pairing, no
crashes across all four combinations).

- MG_State/MG_Impl: sync explicitly-ranged SSBO bindings of FLUSH_EXPLICIT
  persistent maps to the backend before compute dispatches. Flywheel writes
  its scatter-copy descriptors into the staging ring's persistent map and
  never flushes that span (UB per spec, works on drivers whose maps alias
  GPU-visible memory); our maps alias the CPU shadow, so the descriptors
  never reached the GPU: the scatter compute copied nothing (GLES: empty
  draw commands) or stale garbage (Vulkan: wild indirect commands ending in
  VK_ERROR_DEVICE_LOST).
- MG_Impl/MG_Backend: real glFenceSync objects backed by backend fences
  (GLES: native ES syncs guarded by context generation and owner thread;
  Vulkan: buffer-manager frame serials), replacing always-signaled stubs
  that let Flywheel reclaim staging memory the GPU still reads.
- MG_Backend/DirectGLES: compute dispatches now run the same per-program
  resource sync as draws (uniform-block bindings and sampler units must be
  re-established through the API because layout(binding) is stripped from
  transpiled ESSL) and rebind texture units afterwards; the cull shader
  used to read a stale _FlwFrameUniforms binding and the depth-pyramid
  downsample sampled a stale unit-0 texture, zeroing the Hi-Z pyramid and
  occlusion-culling all Flywheel geometry. Image uniforms are excluded from
  glUniform1i (ES bakes their unit via layout(binding)); image-unit sync is
  clamped to the device limit; eliminated/SSBO-classified uniform blocks
  are skipped.
- MG_Backend/DirectGLES: gl_BaseInstance in native indirect draws reads the
  GPU-written command buffer through an injected mg_IndirectParams SSBO
  view addressed per draw instead of the zero CPU shadow; layout(binding)
  is preserved for SSBO/image declarations (ES has no API rebinding for
  them); the ES context ownership claim moved to a global atomic owner
  thread with an EGL ground-truth check, and deferred buffer op state is
  mutex-guarded, so ops cannot silently no-op after context migration.
- MG_Backend/DirectVulkan: new RebaseInstanceIndexPass rewrites vertex
  InstanceIndex loads to (InstanceIndex - BaseInstance). glslang's relaxed
  Vulkan mode aliases gl_InstanceID to InstanceIndex, which includes
  firstInstance, but GL's gl_InstanceID is zero-based - draws with nonzero
  baseInstance paired meshes with wrong instance data (cogwheel drawn as a
  waterwheel, another wheel collapsed invisible). Gated on the
  shaderDrawParameters device feature. Sampled-read barriers additionally
  cover the compute stage (the Hi-Z downsample samples the depth
  attachment from compute), and short uniform-buffer ranges keep the
  existing zero-padding.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.h

@@ -166,8 +166,10 @@ namespace MobileGL::MG_Backend::DirectVulkan {
             }
         };
 
-        explicit ProgramFactory(VkDevice device, const VulkanRendererConfig& config, Uint32 maxBindings = 16)
-            : m_device(device), m_config(config), m_maxBindings(maxBindings) {
+        explicit ProgramFactory(VkDevice device, const VulkanRendererConfig& config, Uint32 maxBindings = 16,
+                                Bool shaderDrawParametersEnabled = false)
+            : m_device(device), m_maxBindings(maxBindings), m_config(config),
+              m_shaderDrawParametersEnabled(shaderDrawParametersEnabled) {
             VkProgramObject::s_device = device;
         }
         ~ProgramFactory() = default;
@@ -201,6 +203,9 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         Uint32 m_maxBindings = 0;
         UnorderedMap<HashType, VkProgramObject> m_cache;
         const VulkanRendererConfig& m_config;
+        // True when the device enabled shaderDrawParameters; gates the InstanceIndex rebase pass
+        // (which needs the DrawParameters capability / gl_BaseInstance builtin).
+        Bool m_shaderDrawParametersEnabled = false;
         mutable ProgramLookupCache m_lastLookup;
         static inline XXH64_state_t* m_hashState = XXH64_createState();
     };