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21 commits

Author SHA1 Message Date
M. Stoeckl
40237b213a Simplify text shader 2019-02-04 19:03:25 +00:00
M. Stoeckl
3f0d11381d Remove unused coordinate from rect shader 2019-02-03 16:45:09 +00:00
Christian Duerr
cf9d94eb12
Add color option to visual bell
This adds the option to specify the color of the visual bell using the
`visual_bell.color` configuration setting.

This is done by rendering a big quad over the entire screen, which also
opens up options to draw other arbitrary rectangles on the screen in the
future.
2018-12-17 19:06:07 +00:00
Joe Wilm
b79574ee82 Fix solid background color opacity (#847)
Since landing the patch adding transparency support to Alacritty,
there's been an issue where othewise solid background cells were also
being rendered partially transparent. Now, all filled background cells
are rendered fully opaque.

Some logic was added to support discarding filled backgrounds which had
the same color as the default background. This means that, if the
default background is #000 and a cell has that background, it will never
be rendered opaque. This may not be correct.

Note that many truecolor vim color schemes print spaces for default
colored background cells. Performance can be dramatically improved by
using ctermbg=NONE guibg=NONE to skip rendering those cells.
2017-10-21 15:26:42 -07:00
Gabriel Martinez
5009566ea5 Add background_opacity option to set terminal transparency (#331)
The option is an Alpha struct that ensures that the contained float is
between 0.0 and 1.0. Background colors are multiplied by the opacity
to properly alpha blend them.
2017-08-20 09:55:45 -07:00
Joe Wilm
149fbaef09 Fix glyph offsets in cell
We previously had a hard-coded value for aligning glyphs within cells.
The font descent is now used, and the offset should be correct by
default.
2017-05-06 12:53:54 -07:00
Mark Andrus Roberts
fbc7b72271 Add visual bell support
This commit adds support for a visual bell. Although the Handler in src/ansi.rs
warns "Hopefully this is never implemented", I wanted to give it a try. A new
config option is added, `visual_bell`, which sets the `duration` and `animation`
function of the visual bell. The default `duration` is 150 ms, and the default
`animation` is `EaseOutExpo`. To disable the visual bell, set its duration to 0.

The visual bell is modeled by VisualBell in src/term/mod.rs. It has a method to
ring the bell, `ring`, and another method, `intensity`. Both return the
"intensity" of the bell, which ramps down from 1.0 to 0.0 at a rate set by
`duration` and `animation`.

Whether or not the Processor waits for events is now configurable in order to
allow for smooth drawing of the visual bell.
2017-02-07 21:12:56 -08:00
Joe Wilm
e503baf2e7 Live shader reloading is now a feature
Which means it can be disabled in release builds. No more working on a
renderer feature and actually breaking the Alacritty your editor is
running inside.
2016-10-27 08:43:23 -07:00
Joe Wilm
58146acea5 Add license header to glsl files 2016-06-29 21:01:22 -07:00
Joe Wilm
bd8bd26c8b
Add support for macOS
Alacritty now runs on macOS using CoreText for font rendering.

The font rendering subsystems were moved into a separate crate called
`font`. The font crate provides a unified (albeit limited) API which
wraps CoreText on macOS and FreeType/FontConfig on other platforms. The
unified API differed slightly from what the original Rasterizer for
freetype implemented, and it was updated accordingly.

The cell separation properties (sep_x and sep_y) are now premultiplied
into the cell width and height. They were previously passed through as
uniforms to the shaders; removing them prevents a lot of redundant work.

`libc` has some differences between Linux and macOS. `__errno_location`
is not available on macOS, and the `errno` crate was brought in to
provide a cross-platform API for dealing with errno.

Differences in `openpty` were handled by implementing a macOS specific
version. It would be worth investigating a way to unify the
implementations at some point.

A type mismatch with TIOCSCTTY was resolved with a cast.

Differences in libc::passwd struct fields were resolved by using
std::mem::uninitialized instead of zeroing the struct ourselves. This
has the benefit of being much cleaner.

The thread setup had to be changed to support both macOS and Linux.
macOS requires that events from the window be handled on the main
thread. Failure to do so will prevent the glutin window from even
showing up! For this reason, the renderer and parser were moved to their
own thread, and the input is received on the main thread. This is
essentially reverse the setup prior to this commit. Renderer
initialization (and thus font cache initialization) had to be moved to
the rendering thread as well since there's no way to make_context(null)
with glx on Linux. Trying to just call make_context a second time on the
rendering thread had resulted in a panic!.
2016-06-14 07:39:06 -07:00
Joe Wilm
cdea958e71
Add support for drawing background colors 2016-06-06 16:54:15 -07:00
Joe Wilm
ed7aa96907
Refactor Instanced Drawing to use Vertex Arrays
Per-instanced data was previously stored in uniforms. This required
several OpenGL calls to upload all of the data, and it was more complex
to prepare (several vecs vs one).

Additionally, drawing APIs are now accessible through a `RenderApi`
(obtained through `QuadRenderer::with_api`) which enables some RAII
patterns. Specifically, checks for batch flushing are handled in Drop.
2016-06-06 13:20:35 -07:00
Joe Wilm
1f3f9add49
Optimize Rendering with batched draw calls
Draw calls are now batched for performance. Render times on git log at
the default size are now ~200usec.
2016-06-04 21:31:41 -07:00
Joe Wilm
2f058bd053
Optimize rendering
This moves some logic that was previously being done per-character into
the vertex shader. At this time, we've traded CPU computation for
additional gl::Uniform2f calls. This is only a marginal improvement.
However, this patch positions the renderer well for instanced drawing,
and that will be a huge performance win.
2016-06-04 15:30:17 -07:00
Joe Wilm
30ec145109
Initial support for Terminal Emulation (woo!)
This patch introduces basic support for terminal emulation. Basic means
commands that don't use paging and are not full screen applications like
vim or tmux. Some paging applications are working properly, such as as
`git log`. Other pagers work reasonably well as long as the help menu is
not accessed.

There is now a central Rgb color type which is shared by the renderer,
terminal emulation, and the pty parser.

The parser no longer owns a Handler. Instead, a mutable reference to a
Handler is provided whenever advancing the parser. This resolved some
potential ownership issues (eg parser owning the `Term` type would've
been unworkable).
2016-06-02 19:42:28 -07:00
Joe Wilm
c70acbac0b
Correct sub-pixel font rendering with OpenGL
Uses the GL_ARB_blend_func_extended to get single-pass, per-channel
alpha blending. gl_generator is now used instead of gl to enable the
extension.

The background color is removed since that presumably needs to run in a
separate pass.
2016-05-20 21:36:28 -07:00
Joe Wilm
e794bc11b9
Use subpixel font rendering
OpenGL only supports shared alpha blending. Subpixel font rendering
requires using the font RGB values as alpha masks for the corresponding
RGB channels. To support this, blending is implemented in the fragment
shader.
2016-04-11 08:05:19 -07:00
Joe Wilm
77cfb7b5cd Implement per vertex struct 2016-02-27 13:08:39 -08:00
Joe Wilm
cda4952145 Bit of cleanup
- Commend vertex slice
- Add helper for binding mask texture (and specify that it's a mask)
- Prefix uniform members of ShaderProgram with u_. This makes it easy to
  identify in the rest of code.
2016-02-24 20:37:17 -08:00
Joe Wilm
24b4c3ba47 Fragment shader supplies color correctly 2016-02-24 19:09:21 -08:00
Joe Wilm
2b7caf95fd Render the letter J
This letter brought to you by OpenGL and freetype.
2016-02-23 20:42:58 -08:00