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If the magnitude of the expected result is small, then we can safely
assume that the actual calculated result matches it to 10 decimal
places.
However, if the magnitude is very large, as it is for some of our exp()
tests, then 10 decimal places represents an unrealistically high level
of precision, for example 24 decimal digits for the test that is
expected to return approximately 6.6e14. IEEE 754 floating point only
has a precision of about 16 decimal digits, causing test failure on
x86 compilers that use an i387 80-bit extended-precision register for
the result and therefore get a slightly different answer.
To avoid this, scale the required precision with the magnitude of the
expected result, so that we accept a maximum error of either 10 decimal
places or 1 part in 1e10, whichever is greater.
[smcv: Added longer commit message explaining why we need this]
(cherry picked from commit
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.github | ||
android-project | ||
build-scripts | ||
cmake | ||
docs | ||
include | ||
mingw/pkg-support/cmake | ||
src | ||
test | ||
VisualC | ||
VisualC-GDK | ||
VisualC-WinRT | ||
wayland-protocols | ||
Xcode | ||
.clang-format | ||
.clang-tidy | ||
.editorconfig | ||
.gitignore | ||
.wikiheaders-options | ||
Android.mk | ||
BUGS.txt | ||
CMakeLists.txt | ||
CREDITS.md | ||
INSTALL.md | ||
LICENSE.txt | ||
README-SDL.txt | ||
README.md | ||
WhatsNew.txt |
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md. If you are migrating to SDL 3.0 from SDL 2.0, the changes are extensively documented in README-migration.md.
Enjoy!
Sam Lantinga (slouken@libsdl.org)