Architecture validation

This guide describes reusable checks for the selected Engine, Native GLFW and OpenGL assembly. The module guide defines target ownership, public usage requirements, selection options and test runners. Use these procedures when changes affect isolation, composition or consumer contracts; coverage limits remain separate from source completion.

Coverage and selection

Selection	Required checks
Engine only	No Cheryl OpenGL/GLAD/GLFW/Gainput/native X11 discovery, compilation or linkage. The Engine consumer and neutral first-include probes inherit public requirements without handwritten paths. Unit tests use real Engine code with small contract adapters, without native modules, displays or devices. Measure their build/run cost separately from broader acceptance.
Engine + Native GLFW	Native consumer/probes and implementation cases link the selected owner. No Cheryl OpenGL backend, GLAD generation or explicit OpenGL package requirement is selected; upstream GLFW retains its context machinery. Native-only selection does not promise a window-only runtime.
Engine + Native GLFW + OpenGL	OpenGL consumer/probes, module implementation cases and selected owner/combined runner registration are correct. Native startup, presentation, retained-resource cleanup, input backpressure and concurrent shutdown require their explicit opt-ins.
Standalone and supplied targets	Each module reuses one Engine; OpenGL reuses one Native GLFW. Dependency bootstrapping does not recursively enable root modules, tests or demo. Consumers link their actual owners and CTest discovers module-local cases.
Crash bootstrap	An Engine-only consumer referencing no Engine entry point receives the automatic bootstrap object. Check the consumer’s actual `NDEBUG` scope independently of exception/explicit traces or standalone Backward tests.
Startup support	Explicitly compile `cengine_startup` in Engine-only composition and `module_opengl_startup` through the native demo. Installed SDK checks compile both support headers independently. Plain Engine/OpenGL links remain free of CLI11 usage requirements; dedicated parser/factory regressions remain pending.
Worker support	Engine-only/JSON-only selection omits hwloc discovery/linkage. Controlled fixtures check owned snapshots, sparse/asymmetric topology, placement, fairness/caps and failure safety; native hwloc checks additionally require real eligible CPUs and binding support.
Installed SDK	Extract into a different prefix, reject producer-path leakage, compile public/Startup header probes and run consumers linked only to installed Cheryl libraries. Windows must use bundled dependency DLLs; source-tree consumers alone do not prove this path.

Controlled Engine tests establish runtime, publication and failure behavior against predictable dependencies. Implementing modules own checks of their actual behavior and contract compliance; passing with a dummy does not establish module conformance. Broader Engine cases cover dispatch/cancellation, events, workers, timing, caches, retained frames and failure paths. Owner runners and the combined runner reuse case objects, so choose one runner or CTest prefix for each scenario rather than executing the same cases through every aggregate.

Repeating validation

Use the toolchain and selected-owner prerequisites in the build guide. An existing combined build cannot prove Engine-only isolation. Use a fresh directory when an independent graph is needed, and inspect target dependencies, compilation inventories and final links. Reuse matching compiled targets for unaffected checks.

Batch required build targets and select each case once. Use isolated working directories for checks that share mutable files. CMAKE_CXX_SCAN_FOR_MODULES=OFF avoids C++ language-module scanning; Cheryl integration modules are libraries. CMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE=PRE_TEST keeps case discovery out of build execution. Runner selection explains focused and aggregate registration.

Engine only

A fresh Release configuration provides a neutral graph without sandbox mode:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  cmake -S . -B build-validation-release -G Ninja \
    -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
    -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_SCAN_FOR_MODULES=OFF \
    -DCMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE=PRE_TEST \
    -DCHERYL_LOG_PROFILE=developer \
    -DCHERYL_BUILD_NATIVE_GLFW=OFF -DCHERYL_BUILD_OPENGL=OFF \
    -DCHERYL_BUILD_DEBUG_TERMINAL_LINUX=OFF \
    -DCHERYL_BUILD_UI_TGUI=OFF -DCHERYL_BUILD_UI_RMLUI=OFF \
    -DCHERYL_BUILD_AUDIO_MINIAUDIO=OFF \
    -DCHERYL_BUILD_TESTS=ON -DCHERYL_BUILD_CONSUMER_TESTS=ON \
    -DCHERYL_BUILD_ALL_TESTS=OFF -DCHERYL_BUILD_ACCEPTANCE_TESTS=OFF \
    -DCHERYL_BUILD_DEMO=OFF -DCHERYL_SANDBOX_BUILD=OFF
  cmake --build build-validation-release --parallel --target \
    consumer-cengine tests-engine tests-logging \
    acceptance-logging acceptance-signal
  ./build-validation-release/cheryl-consumer
  ./build-validation-release/tests-engine
)

Consumers depend on their first-include probes; no separate probe build is needed. Use the logging and Release signal drivers below. The logging driver also executes focused logging cases, so they need no additional unit run.

Engine-only composition graph

The independent Linux Release graph is accepted. To repeat its isolation check when composition changes, reuse a matching build/testing-engine-isolation or configure the graph below. It includes common Startup and public first-include probes while omitting optional topology helpers, modules, tests and SDK exports:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  cmake -S . -B build/testing-engine-isolation -G Ninja \
    -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
    -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_SCAN_FOR_MODULES=OFF \
    -DCHERYL_BUILD_NATIVE_GLFW=OFF -DCHERYL_BUILD_OPENGL=OFF \
    -DCHERYL_BUILD_DEBUG_TERMINAL_LINUX=OFF \
    -DCHERYL_BUILD_UI_TGUI=OFF -DCHERYL_BUILD_UI_RMLUI=OFF \
    -DCHERYL_BUILD_AUDIO_MINIAUDIO=OFF -DCHERYL_BUILD_DEMO=OFF \
    -DCHERYL_BUILD_WORKER_TOPOLOGY_HWLOC=OFF -DCHERYL_BUILD_WORKER_TOPOLOGY_JSON=OFF \
    -DCHERYL_BUILD_SDK=OFF -DCHERYL_BUILD_TESTS=OFF \
    -DCHERYL_BUILD_CONSUMER_TESTS=ON
  cmake --build build/testing-engine-isolation --parallel --target \
    cengine_startup consumer-cengine
  ./build/testing-engine-isolation/cheryl-consumer
  ninja -C build/testing-engine-isolation -t commands consumer-cengine
)

Inspect the target graph, compile_commands.json and final consumer link for Cheryl native/OpenGL/GLAD/GLFW/Gainput, UI/audio and hwloc dependencies; all must be absent. A consumer in a full-module root does not prove this boundary. This check establishes graph isolation, not rendering appearance or device operation.

Engine asset and text regressions

The Linux Release Engine-only selection covers neutral clip, tile selection/animation, indexed graphics/shader manifests, immutable samplers, UTF-8, legacy scalar fallback, owned font selection/layout and text-resource regressions plus public first-include probes. It uses immutable synthetic resources, the bundled font and isolated discovery roots; no display, installed font, controller or audio device is needed. These CPU cases do not establish native text rendering, artwork appearance, device output or other platforms.

Reuse build/testing-engine when its toolchain/configuration matches. When a relevant change requires a rerun, batch the runner and public probes and select only the affected cases; avoid repeating them through aggregates. This complete focused selection is reusable from any directory inside the checkout and preserves the caller’s working directory:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  cmake -S . -B build/testing-engine -G Ninja \
    -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
    -DCMAKE_EXPORT_COMPILE_COMMANDS=ON -DCMAKE_CXX_SCAN_FOR_MODULES=OFF \
    -DCMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE=PRE_TEST \
    -DCHERYL_LOG_PROFILE=developer -DCHERYL_SANDBOX_BUILD=OFF \
    -DCHERYL_BUILD_NATIVE_GLFW=OFF -DCHERYL_BUILD_OPENGL=OFF \
    -DCHERYL_BUILD_DEBUG_TERMINAL_LINUX=OFF \
    -DCHERYL_BUILD_UI_TGUI=OFF -DCHERYL_BUILD_UI_RMLUI=OFF \
    -DCHERYL_BUILD_AUDIO_MINIAUDIO=OFF \
    -DCHERYL_BUILD_TESTS=ON -DCHERYL_BUILD_CONSUMER_TESTS=ON \
    -DCHERYL_BUILD_ALL_TESTS=OFF -DCHERYL_BUILD_ACCEPTANCE_TESTS=ON \
    -DCHERYL_BUILD_DEMO=OFF
  cmake --build build/testing-engine --parallel "$(nproc)" --target \
    cengine_startup tests-engine consumer-cengine
  ./build/testing-engine/cheryl-consumer
  ctest --test-dir build/testing-engine --parallel "$(nproc)" --output-on-failure \
    --no-tests=error \
    -R '^tests-engine\.((audio_clip|tile_selection|tileset_selection|tile_animation|asset_manifest|asset_pivot|asset_grid|shader_assets|image_sampling|utf8|stbfont|font_selection|text_layout|text_resources|text_runs)\.|asset_submission\.(selected_tile|tile_strip_ranges|text_layout_and_retention|utf8_text)$)'
)

The earlier font/layout/resource baseline is accepted in the Linux Release Engine-only selection; startup support and the independent consumer also compile. The existing font_selection.families fixture establishes basic discovery and ordering; it does not cover declared-weight ranking or heavy-only automatic exclusion. Those fixture/case gaps remain in the Unicode plan. Startup and UI callback/placeholder regression gaps are in the roadmap checklist.

Graphics 2.0, indexed shader/sampling and positioned-text CPU checks are accepted in the selected Linux compositions. The independent Release graph is also accepted; demo reload/artwork observations remain separate QA. The manifest count fixture matches the pinned catalog.

Worker topology and configuration

The worker contract has controlled coverage for snapshot ownership/validation, private/shared caches, SMT, sparse/asymmetric CPUs, missing information, automatic sizing, reuse/spread targeting, fair progress/caps, required rejection, preferred fallback, binding/read-back and thread-start failures. Provider lifetime extends through joins. JSON cases check equivalence with typed options and reject invalid versions/properties/ranges before work is created.

For a fresh Linux Release selection, use separate directories for optional hwloc enabled/disabled builds. This selects focused cases once, including native hwloc checks only in the enabled build:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  for worker_hwloc in ON OFF; do
    worker_build="build/testing-workers-${worker_hwloc}"
    worker_targets="tests-engine acceptance-engine tests-worker-topology-json consumer-worker-topology"
    if [ "$worker_hwloc" = ON ]; then
      worker_targets="$worker_targets tests-worker-topology-composition acceptance-worker-topology-hwloc"
    fi
    cmake -S . -B "$worker_build" -G Ninja \
      -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
      -DCMAKE_CXX_SCAN_FOR_MODULES=OFF \
      -DCMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE=PRE_TEST \
      -DCHERYL_BUILD_NATIVE_GLFW=OFF -DCHERYL_BUILD_OPENGL=OFF \
      -DCHERYL_BUILD_DEBUG_TERMINAL_LINUX=OFF \
      -DCHERYL_BUILD_UI_TGUI=OFF -DCHERYL_BUILD_UI_RMLUI=OFF \
      -DCHERYL_BUILD_AUDIO_MINIAUDIO=OFF -DCHERYL_BUILD_DEMO=OFF \
      -DCHERYL_BUILD_WORKER_TOPOLOGY_HWLOC="$worker_hwloc" \
      -DCHERYL_BUILD_WORKER_TOPOLOGY_JSON=ON \
      -DCHERYL_BUILD_TESTS=ON -DCHERYL_BUILD_CONSUMER_TESTS=ON \
      -DCHERYL_BUILD_ALL_TESTS=OFF -DCHERYL_BUILD_ACCEPTANCE_TESTS=ON
    cmake --build "$worker_build" --parallel --target $worker_targets
    ctest --test-dir "$worker_build" --parallel "$(nproc)" \
      --output-on-failure --no-tests=error \
      -R '^(tests-engine\.(worker_pool(_native|_faults)?|worker_topology|worker_configuration)\.|acceptance-engine\.worker_locality\.|tests-worker-topology-(json|composition)\.|acceptance-worker-topology-hwloc\.|consumer-worker-topology$)'
  done
)

Reuse each matching configuration when source/toolchain/options agree. Inspect the disabled graph/final links for absence of hwloc. Native checks observe inherited eligibility, worker masks, CPU binding without memory-policy changes and workload progress. Some need two eligible physical cores or OS memory-policy observation; skips leave that coverage unavailable. Linux native behavior is accepted for the tested host; the hosted CI selection excludes this hardware acceptance runner. Correct masks/progress do not establish cache residency or a workload speedup.

Installed SDK consumers

The CI producer profile configures Ninja with the selected modules/helpers, explicit owner targets and CHERYL_BUILD_SDK=ON. Use a clean pinned checkout and the producer’s dependencies/toolchain. Supply the font fixtures for complete allocation coverage; missing CFF coverage is reported separately. On Linux, a local equivalent is:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  python3 .github/ci/run.py --build-dir build/ci --profile modules --hwloc ON --sdk
  python3 .github/ci/package.py --build-dir build/ci --output build/packages
  python3 .github/ci/verify_sdk.py --packages build/packages \
    --producer-build build/ci --build-dir build/sdk-consumer
)

Reuse build/ci only when its recorded source/toolchain/configuration/features match; omit the producer step when the matching build/checks are already accepted. The consumer directory and its sibling sdk-consumer-relocated-sdk must be fresh. The verifier checks SHA256, archive contents, producer paths and seven selected consumer programs plus first-include and Startup probes. It uses checkout test fixtures but imports installed Cheryl libraries, rebuilding none of their source. Windows CI uses the same steps under its MSVC Developer PowerShell with the manifest’s vcpkg toolchain and DLL prefix. The selected hosted Ubuntu and Windows producer/relocated-consumer paths are accepted within the CI coverage limits. The first main-push artifact collection remains TR20. This reusable procedure does not assert acceptance of unexecuted new cases.

Typed events

For Engine-only typed-event checks, enable CHERYL_BUILD_ACCEPTANCE_TESTS alongside the unit and consumer selections above and add acceptance-engine to the needed build targets. The consumer and first-include probes cover the neutral typed API. Run the focused unit and acceptance selections:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  ./build-validation-release/cheryl-consumer
  ./build-validation-release/tests-engine --gtest_filter=typed_events.*
  ./build-validation-release/tests-acceptance-engine \
    --gtest_filter='typed_events.*:event_delivery.runtime_owner_threads'
)

The unit cases cover exact identity, type constraints, owned payloads, removal, nested dispatch and immediate errors. The acceptance cases cover deferred copies, cancellation, error-sink ownership, waits and worker FIFO. event_delivery.runtime_owner_threads exercises typed resize payloads on platform and simulation owners in sequential and concurrent runtime modes without borrowing window access across owners.

Select Native GLFW + OpenGL with native input and OpenGL acceptance enabled for the native resize bridge. With a usable display, run its focused owner cases:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  CHERYL_NATIVE_GL_TESTS=1 ./build-opengl-module/tests-acceptance-opengl \
    --gtest_filter='native_opengl.resize_events:native_opengl.typed_resize_failure:native_opengl.resize_callback_failure'
)

These cases invoke the actual registered C callback to check unchanged-size suppression, saved observations across nested resize delivery, legacy-before-typed offers and native failure consumption. They do not establish compositor-generated resize delivery. Skipped native cases leave that callback coverage pending. Windows execution is shelved in the platform plan.

Native, OpenGL and standalone composition

The standalone entry points can prove both the selected dependency graphs and module bootstrap without building each assembly twice. Use the same Release, logging and discovery settings as above. Enable CHERYL_BUILD_TESTS, CHERYL_BUILD_CONSUMER_TESTS and CHERYL_BUILD_ALL_TESTS for the selected module. Build its targets together:

Entry point	Targets
`projects/modules/platform/native-glfw/`	`consumer-module-native-glfw`, `tests-native-glfw`, `all-native-glfw`
`projects/modules/graphics/opengl/`	`consumer-module-opengl`, `tests-opengl`, `acceptance-opengl`, `all-opengl`

Supply CHERYL_REPOSITORY_ROOT explicitly; OpenGL also accepts CHERYL_NATIVE_GLFW_SOURCE. For Linux/X11 native input, select CHERYL_NATIVE_INPUT=ON, CHERYL_NATIVE_NULL_PLATFORM=OFF, GLFW_BUILD_X11=ON and GLFW_BUILD_WAYLAND=OFF. Bootstrapped Engine tests remain disabled; OpenGL’s Native bootstrap must not select Native tests/consumers. Run each selected consumer and its needed cases, and inspect module-local CTest registration with ctest -N.

For supplied-target reuse, an independent host can compose the owners directly:

cmake_minimum_required(VERSION 3.28)
set(CMAKE_CXX_STANDARD 23)
project(cheryl_module_reuse LANGUAGES C CXX)
enable_testing()

set(CHERYL_BUILD_ROOT "${CMAKE_CURRENT_BINARY_DIR}")
block(SCOPE_FOR VARIABLES)
    set(CHERYL_BUILD_NATIVE_GLFW OFF)
    set(CHERYL_BUILD_OPENGL OFF)
    set(CHERYL_BUILD_UI_TGUI OFF)
    set(CHERYL_BUILD_UI_RMLUI OFF)
    set(CHERYL_BUILD_TESTS OFF)
    set(CHERYL_BUILD_CONSUMER_TESTS OFF)
    set(CHERYL_BUILD_DEMO OFF)
    add_subdirectory("${CHERYL_REPOSITORY_ROOT}" engine EXCLUDE_FROM_ALL)
endblock()

set(CHERYL_BUILD_TESTS ON)
set(CHERYL_BUILD_CONSUMER_TESTS ON)
set(CHERYL_BUILD_ALL_TESTS ON)
add_subdirectory("${CHERYL_NATIVE_GLFW_SOURCE}" native-glfw)
add_subdirectory("${CHERYL_OPENGL_SOURCE}" opengl)

Use explicit source paths and the same compiler/Release/logging settings. The host owns root enable_testing() policy. Verify actual consumer links, local CTest registration, one target per owner and no duplicate dependency bootstrap directories. Source-target composition does not prove installed/imported package support.

Neutral UI consumer

ui_probe.retained_scene uses Engine alone with controlled display, input, resources and rendering in both runtime modes. It checks ordered colored/clipped packets, keyboard/text focus with controller gameplay, queued immutable image replacement and retained resources through teardown. It supplies synthetic ASCII metrics to legacy CE::Text::Legacy::AsciiFont, so it needs no host font and does not establish Unicode appearance.

With the Engine-only configuration above and acceptance selected, run:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  cmake --build build-validation-release --parallel --target acceptance-engine
  ./build-validation-release/tests-acceptance-engine --gtest_filter='ui_probe.*:runtime_adapter.*'
)

The separate native_opengl.ui_clipping_color case checks real straight-alpha pixels and scaled clipping. Use the native opt-in below. Neither controlled proof establishes toolkit behavior, physical DPI/compositor behavior or IME; selected adapters own their checks.

Native and fixture checks

Sampling and positioned text

Selected Linux OpenGL sampling/shader checks, TGUI/RmlUi/coexistence suites and their consumers are accepted. Native acceptance includes nearest/linear sampling, retained sampler defaults, UI clipping, retained reload and positioned text/run lifetime. Keep other desktop/material-failure observations separate. Anisotropy coverage depends on driver support; unsupported hardware establishes fallback only. Controlled font-filter checks do not establish new native nearest-font appearance.

For a sampling/submission change, configure a matching native composition and build affected owners together. This block supplies its own configuration rather than assuming a retired testing request’s build exists:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  cmake -S . -B build/testing-graphics -G Ninja \
    -DCMAKE_BUILD_TYPE=Release -DCMAKE_POLICY_VERSION_MINIMUM=3.5 \
    -DCMAKE_CXX_SCAN_FOR_MODULES=OFF \
    -DCMAKE_GTEST_DISCOVER_TESTS_DISCOVERY_MODE=PRE_TEST \
    -DCHERYL_LOG_PROFILE=developer \
    -DCHERYL_BUILD_NATIVE_GLFW=ON -DCHERYL_BUILD_OPENGL=ON \
    -DCHERYL_BUILD_DEBUG_TERMINAL_LINUX=OFF \
    -DCHERYL_NATIVE_INPUT=ON -DCHERYL_NATIVE_NULL_PLATFORM=OFF \
    -DGAINPUT_ENABLE_HID=OFF -DGLFW_BUILD_WAYLAND=OFF \
    -DCHERYL_BUILD_UI_TGUI=ON -DCHERYL_BUILD_UI_RMLUI=ON \
    -DCHERYL_RMLUI_TEST_FONT="$PWD/assets/fonts/DejaVuSans.ttf" \
    -DCHERYL_BUILD_AUDIO_MINIAUDIO=OFF -DCHERYL_BUILD_DEMO=ON \
    -DCHERYL_BUILD_TESTS=ON -DCHERYL_BUILD_CONSUMER_TESTS=ON \
    -DCHERYL_BUILD_ALL_TESTS=OFF -DCHERYL_BUILD_ACCEPTANCE_TESTS=ON
  cmake --build build/testing-graphics --parallel --target \
    tests-opengl tests-ui-tgui tests-ui-rmlui tests-ui-coexist \
    consumer-module-opengl consumer-module-ui-tgui consumer-module-ui-rmlui \
    acceptance-opengl
  ./build/testing-graphics/cheryl-opengl-consumer
  ./build/testing-graphics/cheryl-ui-tgui-consumer
  ./build/testing-graphics/cheryl-ui-rmlui-consumer
  ctest --test-dir build/testing-graphics --parallel "$(nproc)" \
    --output-on-failure --no-tests=error \
    -R '^(tests-opengl|tests-ui-tgui|tests-ui-rmlui|tests-ui-coexist)\.'
  CHERYL_NATIVE_GL_TESTS=1 ctest --test-dir build/testing-graphics \
    --output-on-failure --no-tests=error \
    -R '^acceptance-opengl\.native_opengl\.(texture_sampling|ui_clipping_color|retained_frame_reload|text_runs|text_run_lifetime)$'
)

Reuse matching builds and select only affected checks; do not rerun accepted suites merely to populate an execution log. The text contract describes shader requirements and floating-point boundary coverage limits.

Native OpenGL cases require CHERYL_NATIVE_GL_TESTS=1 and a usable display:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  CHERYL_NATIVE_GL_TESTS=1 ./build-opengl-module/tests-all-opengl \
    --gtest_filter=native_opengl.*
)

Native cases cover resource retirement, context restoration, retained-frame reload, failed construction/reflection cleanup, texture row conventions, timing/backpressure and composed runtime failure cleanup. Include the replacement-poll/platform-drain backpressure check and startup/shutdown failures. Accepted uploads settle before game cleanup, and a later deinit error must preserve the original failure. Resource retirement or abandonment precedes context destruction; driver deletion queries run while the borrowed window is still alive. Do not infer these guarantees from mock tests or an aggregate whose opt-ins are unknown.

The ordered X11 input case additionally needs a Linux/X11 build and session. Native cases skip unless requested; a requested unusable display does not count as a pass. If current demo evidence is unavailable, run finite sequential/concurrent sessions with --max-updates; interactive checks are in native-desktop-checks.md.

Real-font allocation checks need CHERYL_STB_ALLOCATION_TTF and CHERYL_STB_ALLOCATION_CFF to name suitable TrueType and CFF OpenType faces, each with a glyph wider than 64 pixels at size 128. DejaVuSans.ttf and NimbusSans-Regular.otf are example fixtures. Export both paths and select --gtest_filter=font_bake.real_* on an Engine acceptance/aggregate or combined runner. These cases sweep bake scratch allocation failures and nested scopes, requiring released scratch and no provider upload on failure. Missing fixture paths skip; unusable supplied paths fail.

Linux worker checks exercise inherited-mask discovery/restoration and native kernel rejection. They can skip when required CPUs/capabilities are unavailable; controlled policy/thread-start faults provide different coverage. Identify configuration, opt-ins and skips when assessing acceptance instead of treating a partial aggregate as complete coverage.

Manual acceptance drivers

Drivers execute previously built targets and never configure or build:

(
  set -e
  cd "$(git rev-parse --show-toplevel)"
  python3 projects/engine/tests/logging-acceptance/logging.py build-validation-release
  python3 projects/engine/tests/signal-acceptance/signals.py \
    --release-build build-validation-release --debug-build build-validation-debug
  python3 projects/tests/diagnostics.py build-combined
)

The logging procedure and compile-profile matrix are in logging-acceptance.md. Diagnostics require the combined runner because shader reflection belongs to OpenGL; use the developer logging profile unless explicitly checking stripped diagnostics. Neither driver needs a fresh full-aggregate run.

For the Debug signal check, build only acceptance-signal against a current neutral Debug Engine archive and verify its final link excludes native/OpenGL owners. Configure an Engine-only Debug directory if no suitable archive exists. The POSIX driver accepts either build argument alone, checks actual NDEBUG scope and bounds children to 15 seconds with core files disabled. Debug requires Backward’s trace header and a stack frame; NDEBUG requires ordinary signal termination without that header. Sanitizer output alone is insufficient. This proves automatic Engine bootstrap delivery, separately from exception traces or standalone Backward tests; Windows crash-hook acceptance requires separate checks.

Evidence limits

Software-driver acceptance does not establish physical GPU/compositor behavior, hardware reset recovery, physical-device fidelity, arbitrary OS layouts/IME, every font/transform or exhaustive interleavings. OpenGL 3.3 baseline, full Wayland and other operating-system support need their own acceptance. Live privileged policy changes and actual kernel rejection differ from controlled failure injection. Sanitizers supplement selected checks; TSan requires a configuration without the Debug ASan/UBSan combination and cannot be inferred from those runs.

Keep source completion distinct from executable acceptance and unavailable-host coverage. Unresolved work remains in the planning catalogue; this guide is a reusable procedure, not an execution journal.