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wx_BGI_Graphics
Classic BGI-compatible graphics API with modern OpenGL extension API
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This document describes the automated test suite for wx_BGI_Graphics.
All tests are registered with CTest and run automatically in CI.
See Building.md for build commands.
See WxWidgets.md for the embedded canvas integration guide.
| # | Test Name | Category | Source File | Notes |
|---|---|---|---|---|
| 1 | bgi_api_coverage_cpp | C++ | examples/cpp/bgi_api_coverage.cpp | Classic BGI API coverage |
| 2 | wxbgi_camera_demo_cpp | C++ | examples/cpp/wxbgi_camera_demo.cpp | Camera/UCS/world demo — --test flag |
| 3 | test_dds_serialize | C++ / DDS | examples/cpp/ | DDS JSON + YAML serialization |
| 4 | test_dds_deserialize | C++ / DDS | examples/cpp/ | DDS JSON + YAML deserialization |
| 5 | test_dds_clear | C++ / DDS | examples/cpp/ | DDS scene clear |
| 6 | test_dds_cam2d_yz | C++ / DDS | examples/cpp/ | 2-D camera in YZ plane |
| 7 | test_dds_cam3d_persp | C++ / DDS | examples/cpp/ | 3-D perspective camera |
| 8 | test_multi_scene | C++ / DDS | examples/cpp/test_multi_scene.cpp | Multi-CHDOP: scene lifecycle, camera→scene assignment, JSON round-trip |
| 9 | wxbgi_multi_scene_demo | C++ / DDS | examples/cpp/wxbgi_multi_scene_demo.cpp | 3-panel multi-scene demo — --test flag |
| 10 | test_solids | C++ / DDS | examples/cpp/ | 3-D solid primitives (box, sphere, cylinder, …) |
| 11 | test_input_hooks | C++ | examples/cpp/ | Keyboard hook / input-inject (requires WXBGI_ENABLE_TEST_SEAMS) |
| 12 | test_input_bypass | C++ | examples/cpp/ | Input bypass + scroll hook |
| 13 | bgi_api_coverage_python | Python | examples/python/bgi_api_coverage.py | ctypes BGI API coverage |
| 14 | bgi_api_coverage_pascal_build | Pascal | examples/demoFreePascal/demo_bgi_api_coverage.pas | FPC compile |
| 15 | bgi_api_coverage_pascal_run | Pascal | same | GLFW → wx-standalone path |
| 16 | bgi_canvas_coverage_pascal_build | Pascal | examples/demoFreePascal/demo_bgi_canvas_coverage.pas | FPC compile |
| 17 | bgi_canvas_coverage_pascal_run | Pascal | same | wx-only path (no GLFW) |
| 18 | test_input_hooks_pascal_build | Pascal | examples/demoFreePascal/test_input_hooks.pas | FPC compile |
| 19 | test_input_hooks_pascal_run | Pascal | same | Keyboard hook — Pascal |
| 20 | test_input_bypass_pascal_build | Pascal | examples/demoFreePascal/test_input_bypass.pas | FPC compile |
| 21 | test_input_bypass_pascal_run | Pascal | same | Input bypass — Pascal |
| 22 | wx_bgi_solids_test | wxWidgets | examples/wx/wx_bgi_solids_test.cpp | 3-D solids in embedded canvas |
| 23 | wx_bgi_3d_orbit_test | wxWidgets | examples/wx/wx_bgi_3d_orbit_test.cpp | 3-D orbit animation in embedded canvas |
| 24 | wx_bgi_canvas_coverage_test | wxWidgets | examples/wx/wx_bgi_canvas_coverage_test.cpp | Full BGI API coverage — C++ embedded WxBgiCanvas |
Pascal tests (14–21) run only when a matching-architecture FreePascal compiler (fpc) is found at CMake configure time.
These tests link directly against wx_bgi_opengl (the DLL/shared library) and exercise the full API surface through a real graphics window.
| Test | What it checks |
|---|---|
bgi_api_coverage_cpp | All classic BGI drawing functions: line, circle, arc, bar, fillpoly, outtextxy, getimage/putimage, page switching, palette, viewport |
wxbgi_camera_demo_cpp | Camera creation and orbiting (wxbgi_cam_*), UCS frames (wxbgi_ucs_*), world-coordinate drawing (wxbgi_world_*), camera fit-to-extents |
test_dds_serialize | wxbgi_dds_save_json / wxbgi_dds_save_yaml round-trip correctness |
test_dds_deserialize | wxbgi_dds_load_json / wxbgi_dds_load_yaml round-trip correctness |
test_dds_clear | wxbgi_dds_clear removes all scene objects |
test_dds_cam2d_yz | 2-D orthographic camera in the YZ plane; coordinate projection |
test_dds_cam3d_persp | 3-D perspective projection; worldToScreen math |
test_multi_scene | Multi-CHDOP scene lifecycle: wxbgi_dds_scene_create, wxbgi_dds_scene_exists, wxbgi_dds_scene_set_active, wxbgi_cam_set_scene/wxbgi_cam_get_scene, scene isolation (objects in "secondary" do not appear in "default"), wxbgi_dds_scene_destroy (cameras fall back to "default"), JSON round-trip preserving scene assignment |
wxbgi_multi_scene_demo | Full 3-panel multi-scene demo in --test mode: builds "main" and "secondary" scene graphs, creates three cameras (two perspective + one pixel-space ortho), renders one frame via wxbgi_render_dds, exits cleanly |
test_solids | wxbgi_solid_box, wxbgi_solid_sphere, wxbgi_solid_cylinder, wxbgi_solid_cone, wxbgi_solid_torus — all draw modes |
test_input_hooks | Keyboard queue injection via test seams; hook ordering (see Test Seam Policy) |
test_input_bypass | Scroll bypass, input hook chaining, wxbgi_set_input_hook |
Exercises the full BGI API surface via Python ctypes — the same functions as the C++ coverage test.
Each Pascal test has a build step (FPC compile) and a run step.
The build step copies the up-to-date DLL into the output directory automatically.
| Tests | Source | What it checks |
|---|---|---|
14–15 bgi_api_coverage_pascal_* | demo_bgi_api_coverage.pas | Full BGI API surface: GLFW initgraph / closegraph → wxbgi_wx_frame_create; all classic drawing functions + extension API |
16–17 bgi_canvas_coverage_pascal_* | demo_bgi_canvas_coverage.pas | wx-only path (no GLFW): wxbgi_wx_app_create + wxbgi_wx_frame_create; colorful primitives phase + blue-screen phase + extension API |
18–19 test_input_hooks_pascal_* | test_input_hooks.pas | Pascal keyboard hook API |
20–21 test_input_bypass_pascal_* | test_input_bypass.pas | Pascal input bypass / scroll hooks |
Note:
demo_bgi_canvas_coverage.pas(tests 14–15) is the wx-only version — it does not callinitgraphorclosegraph. It uses aYieldMs()helper to keep the wx event loop alive between draw phases.
On Linux and macOS, FreePascal enables strict x87 FPU exception masking by default. GTK's SVG icon renderer (librsvg → libxml2) performs floating-point operations (NaN / denormal arithmetic) that violate this strict mask and raise SIGFPE, appearing as:
All Pascal test programs that open a wx window already include the fix at the top of their begin block:
When writing new Pascal programs on Linux / macOS that use wxbgi_wx_app_create or any GTK-backed wx function, add Math to the uses clause and call SetExceptionMask as the very first statement.
WxBgiCanvas::Render() performs lazy GLEW initialisation the first time the canvas paints. In the C++ tests this paint occurs inside the wx event loop. Pascal (and Python / C) programs that call GL-dependent extension functions such as wxbgi_write_pixels_rgba8 before wxbgi_wx_app_main_loop would previously crash with EAccessViolation (null glWindowPos2i function pointer).
wxbgi_wx_frame_create now calls wxApp::Yield() followed by an explicit WxBgiCanvas::Render() on Linux / macOS after Show(true), so that the GL context is fully initialised — including the DLL-local GLEW function pointer table — before the function returns. This makes GL extension calls safe immediately after wxbgi_wx_frame_create on all platforms.
These link against wx_bgi_wx (the static wx integration library) and use WxBgiCanvas embedded inside a wxFrame.
They are the C++ equivalents of the standalone wx demos.
| Test | Duration | What it checks |
|---|---|---|
wx_bgi_solids_test | < 1 s | 3-D solids render without crash; depth buffer works |
wx_bgi_3d_orbit_test | ~5 s | Camera orbit animation; solid occlusion across 360 ° |
wx_bgi_canvas_coverage_test | ~4 s | Full BGI API coverage in embedded WxBgiCanvas; timer-based two-phase flow |
First-time setup — install system GLFW and wxWidgets if not already done:
Configure and build with the system-package flags:
FreePascal tests (12–19) on macOS: Pascal CTest targets require a working FPC Homebrew install with correct linker paths. If FPC is installed to a non-standard Homebrew prefix the linker may report ‘ld: library 'c’ not found`. All C++, Python, and wxWidgets tests (1–11, 20–22) pass regardless.
These APIs allow CI to inject synthetic key events into the keyboard queue deterministically:
wxbgi_test_clear_key_queue() — empties the keyboard queuewxbgi_test_inject_key_code(code) — enqueues a translated key codewxbgi_test_inject_extended_scan(scan) — enqueues a DOS-style extended scan codeSecurity rules:
-DWXBGI_ENABLE_TEST_SEAMS=ON (default is OFF).#ifdef WXBGI_ENABLE_TEST_SEAMS is present in all usage sites.wxbgi_multi_scene_demo (test #9) uses the same always-available --test mechanism: passing it on the command line causes the demo to build both scene graphs, render one frame with all three cameras, and exit cleanly.
wxbgi_camera_demo_cpp uses a separate, always-available mechanism: passing --test on the command line causes it to render exactly one frame and exit cleanly.
COMMAND in CMakeLists.txt.The repository workflow file is .github/workflows/CI.yml.
Normal push / pull request: matrix CI in Debug mode on Windows, Linux, and macOS.
**Tag push (v1.2.3):** Release build → tests → docs generation → packaging:
| Artifact | Description |
|---|---|
wx_bgi_opengl-windows-x64.zip | Windows x64 DLL + headers |
wx_bgi_opengl-linux-x64.tar.gz | Linux x64 shared library + headers |
wx_bgi_opengl-macos-x64.tar.gz | macOS x64 dylib + headers |
api-docs.zip / api-docs.tar.gz | Doxygen HTML documentation |
Doxygen HTML docs are published to GitHub Pages on every release tag.
v* tags 1.9.8