v0.2.0: splats, copy/paste, faster homes, seat facing, and a full bug sweep

Frame Studio
- Gaussian splats (PLY, SPZ v2-v4), PLY vertex colours, panorama skies
- Copy, cut, paste and duplicate for objects, splats and world items
- Walkable-area rebake moved off the UI thread; viewport one frame sooner;
  refresh-locked pacing (FS_PACE=timer for the old one)
- Fixed: bundle thumbnail use-after-free crash, auto-save deleting
  environments, saves into scratch copies, edits lost on non-ASCII paths,
  unopenable manifests with inf/nan, bundle save data loss, opening a home
  marking it changed, gizmo NaN, long paths, many malformed-file crashes
- Updater verifies sha256, journals the swap and never leaves the exe missing

Frame Home
- Seats turn you to face their way
- Draw batching (Hand Tutorials up to ~20% less GPU time), cut-out EQUAL pass,
  late head-pose read before submit
- Proper queue-family hand-over to the compositor layer; layer descriptor
  generations and seqlocked slots; structural SPIR-V check
- Fixed: hangs/crashes on damaged .fenv files and shaders, render-pass
  validation error, sync hazard in the foveation smoothing pass, unverified
  update downloads, half-done installs

Tests: tests_loco/env_share/spv_check wired into CMake (FRAME_TESTS) and CI.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VsaXGU27gsrXjDoFtyFJP9

third_party/spirv-tools/source/val/basic_block.cpp

@@ -0,0 +1,187 @@
+// Copyright (c) 2015-2016 The Khronos Group Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "source/val/basic_block.h"
+
+#include <algorithm>
+#include <vector>
+
+namespace spvtools {
+namespace val {
+
+BasicBlock::BasicBlock(uint32_t label_id)
+    : id_(label_id),
+      immediate_dominator_(nullptr),
+      immediate_structural_dominator_(nullptr),
+      immediate_structural_post_dominator_(nullptr),
+      predecessors_(),
+      successors_(),
+      type_(0),
+      reachable_(false),
+      structurally_reachable_(false),
+      label_(nullptr),
+      terminator_(nullptr) {}
+
+void BasicBlock::SetImmediateDominator(BasicBlock* dom_block) {
+  immediate_dominator_ = dom_block;
+}
+
+void BasicBlock::SetImmediateStructuralDominator(BasicBlock* dom_block) {
+  immediate_structural_dominator_ = dom_block;
+}
+
+void BasicBlock::SetImmediateStructuralPostDominator(BasicBlock* pdom_block) {
+  immediate_structural_post_dominator_ = pdom_block;
+}
+
+const BasicBlock* BasicBlock::immediate_dominator() const {
+  return immediate_dominator_;
+}
+
+const BasicBlock* BasicBlock::immediate_structural_dominator() const {
+  return immediate_structural_dominator_;
+}
+
+const BasicBlock* BasicBlock::immediate_structural_post_dominator() const {
+  return immediate_structural_post_dominator_;
+}
+
+BasicBlock* BasicBlock::immediate_dominator() { return immediate_dominator_; }
+BasicBlock* BasicBlock::immediate_structural_dominator() {
+  return immediate_structural_dominator_;
+}
+BasicBlock* BasicBlock::immediate_structural_post_dominator() {
+  return immediate_structural_post_dominator_;
+}
+
+void BasicBlock::RegisterSuccessors(
+    const std::vector<BasicBlock*>& next_blocks) {
+  for (auto& block : next_blocks) {
+    block->predecessors_.push_back(this);
+    successors_.push_back(block);
+
+    // Register structural successors/predecessors too.
+    block->structural_predecessors_.push_back(this);
+    structural_successors_.push_back(block);
+  }
+}
+
+bool BasicBlock::dominates(const BasicBlock& other) const {
+  return (this == &other) ||
+         !(other.dom_end() ==
+           std::find(other.dom_begin(), other.dom_end(), this));
+}
+
+bool BasicBlock::structurally_dominates(const BasicBlock& other) const {
+  return (this == &other) || !(other.structural_dom_end() ==
+                               std::find(other.structural_dom_begin(),
+                                         other.structural_dom_end(), this));
+}
+
+bool BasicBlock::structurally_postdominates(const BasicBlock& other) const {
+  return (this == &other) || !(other.structural_pdom_end() ==
+                               std::find(other.structural_pdom_begin(),
+                                         other.structural_pdom_end(), this));
+}
+
+BasicBlock::DominatorIterator::DominatorIterator() : current_(nullptr) {}
+
+BasicBlock::DominatorIterator::DominatorIterator(
+    const BasicBlock* block,
+    std::function<const BasicBlock*(const BasicBlock*)> dominator_func)
+    : current_(block), dom_func_(dominator_func) {}
+
+BasicBlock::DominatorIterator& BasicBlock::DominatorIterator::operator++() {
+  if (current_ == dom_func_(current_)) {
+    current_ = nullptr;
+  } else {
+    current_ = dom_func_(current_);
+  }
+  return *this;
+}
+
+const BasicBlock::DominatorIterator BasicBlock::dom_begin() const {
+  return DominatorIterator(
+      this, [](const BasicBlock* b) { return b->immediate_dominator(); });
+}
+
+BasicBlock::DominatorIterator BasicBlock::dom_begin() {
+  return DominatorIterator(
+      this, [](const BasicBlock* b) { return b->immediate_dominator(); });
+}
+
+const BasicBlock::DominatorIterator BasicBlock::dom_end() const {
+  return DominatorIterator();
+}
+
+BasicBlock::DominatorIterator BasicBlock::dom_end() {
+  return DominatorIterator();
+}
+
+const BasicBlock::DominatorIterator BasicBlock::structural_dom_begin() const {
+  return DominatorIterator(this, [](const BasicBlock* b) {
+    return b->immediate_structural_dominator();
+  });
+}
+
+BasicBlock::DominatorIterator BasicBlock::structural_dom_begin() {
+  return DominatorIterator(this, [](const BasicBlock* b) {
+    return b->immediate_structural_dominator();
+  });
+}
+
+const BasicBlock::DominatorIterator BasicBlock::structural_dom_end() const {
+  return DominatorIterator();
+}
+
+BasicBlock::DominatorIterator BasicBlock::structural_dom_end() {
+  return DominatorIterator();
+}
+
+const BasicBlock::DominatorIterator BasicBlock::structural_pdom_begin() const {
+  return DominatorIterator(this, [](const BasicBlock* b) {
+    return b->immediate_structural_post_dominator();
+  });
+}
+
+BasicBlock::DominatorIterator BasicBlock::structural_pdom_begin() {
+  return DominatorIterator(this, [](const BasicBlock* b) {
+    return b->immediate_structural_post_dominator();
+  });
+}
+
+const BasicBlock::DominatorIterator BasicBlock::structural_pdom_end() const {
+  return DominatorIterator();
+}
+
+BasicBlock::DominatorIterator BasicBlock::structural_pdom_end() {
+  return DominatorIterator();
+}
+
+bool operator==(const BasicBlock::DominatorIterator& lhs,
+                const BasicBlock::DominatorIterator& rhs) {
+  return lhs.current_ == rhs.current_;
+}
+
+bool operator!=(const BasicBlock::DominatorIterator& lhs,
+                const BasicBlock::DominatorIterator& rhs) {
+  return !(lhs == rhs);
+}
+
+const BasicBlock*& BasicBlock::DominatorIterator::operator*() {
+  return current_;
+}
+
+}  // namespace val
+}  // namespace spvtools