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Introduces a heap-based quad allocator that we cache on a per-line basis, so if a line is unchanged we simply need to copy the previously computed set of quads for it into the gpu quad buffer. The results are encouraging wrt. constructing those quads; the `quad_buffer_apply` is the cost of the copy operation, compare with `render_screen_line_opengl` which is the cost of computing the quads; it's 300x better at the p50 and >100x better at p95 for a full-screen updating program: full 2880x1800 screen top: ``` STAT p50 p75 p95 Key(quad_buffer_apply) 2.26µs 5.22µs 9.60µs Key(render_screen_line_opengl) 610.30µs 905.22µs 1.33ms Key(gui.paint.opengl) 35.39ms 37.75ms 45.88ms ``` However, the extra buffering does increase the latency of `gui.paint.opengl` (the overall cost of painting a frame); contrast the above with the latency in the same scenario with the current `main` (rather than this branch): ``` Key(gui.paint.opengl) 19.14ms 21.10ms 28.18ms ``` Note that for an idle screen this latency is ~1.5ms but that is also true of `main`. While the overall latency in the histogram isn't a slam dunk, running `time cat bigfile` is ~10% faster on my mac. I'm sure there's something that can be shaved off to get a more convincing win. |
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Terminal Wizardry
This is a rust crate that provides a number of support functions for applications interested in either displaying data to a terminal or in building a terminal emulator.
It is currently in active development and subject to fairly wild sweeping changes.
Included functionality:
Surfacemodels a terminal display and its componentCells- Terminal attributes are aware of modern features such as True Color, Hyperlinks and will also support sixel and iterm style terminal graphics display.
Surfaces include a log ofChanges and an API for consuming and applying deltas. This is a powerful building block for synchronizing screen instances.- Escape sequence parser decodes inscrutable escape sequences and gives them semantic meaning, making the code that uses them clearer. The decoded escapes can be re-encoded, allowing applications to start with the semantic meaning and emit the appropriate escape sequence without embedding obscure binary bytes.
Capabilitiesallows probing for terminal capabilities that may not be included in the system terminfo database, and overriding them in an embedding application.Terminaltrait provides an abstraction over unix style ttys and Windows style console APIs.Changes fromSurfacecan be rendered toTerminals.Terminals allow decoding mouse and keyboard inputs in both blocking or non-blocking mode.Widgettrait allows composition of UI elements at a higher level.LineEditorimplements shell-like line editing functionality.
Windows Support
Termwiz understands how to work with both the legacy console APIs and the new PTY and virtual terminal features available in Windows 10, allowing for true color terminal applications on Windows 10.