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When determining whether or not to draw each pixel of a textured line
or rectangle, the modulo-by-eight operation was being performed on a
signed value, which was returning a negative value when the pixel being
drawn was off-screen. When the negative value was then converted to an
unsigned value, the result was close to usize::MAX, and was causing an
out-of-bounds array access.
To fix this, the value is converted to an unsigned value before taking
the modulo.
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This is a complete rewrite and restructure of the entire emulator
project, as part of the effort in locking down the Bedrock specification
and in creating much better tooling for creating and using Bedrock
programs.
This commit adds a command-line argument scheme, an embedded assembler,
a headless emulator for use in non-graphical environments, deferred
window creation for programs that do not access the screen device,
and new versions of phosphor and bedrock-core. The new version of
phosphor supports multi-window programs, which will make it possible to
implement program forking in the system device later on, and the new
version of bedrock-core implements the final core specification.
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