| Commit message (Collapse) | Author | Age |
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This removes the if and lowers amount of operations.
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This improves undercurl rendering preserving its original thickness.
This also makes it look not out-of place when places next to other
lines.
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Some old hardware doesn't like universal shader approach for all the
rectangle kinds leading to ALU instruction limits. This commit fixes
it by splitting the shader per rectangle kind.
Fixes #6417.
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The merge requires multiple changes in order to be compatible with the last
version of Alacritty:
- Textures are now always deleted on Drop.
This is required because Alacritty now supports multiple windows in the same
process, so we can't assume that all resources are freed when a single window
is closed. This is the same approach used for the atlas textures.
- The graphics feature is only compatible with OpenGL 3.3.
Alacritty now supports GLES 2.2, but in order to provide a proper support for
it we need a different approach, specific for that version.
- Cell dimensions in pixels are re-added to the alacritty_terminal crate.
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GLES2 has GL_EXT_blend_func_extended extension that enables
dual-source blending, so essentially we can reuse fragment shader
from GLSL3 renderer and do 1 rendering pass instead of 3 for the
text.
Co-authored-by: Kirill Chibisov <contact@kchibisov.com>
Co-authored-by: Christian Duerr <contact@christianduerr.com>
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Since `x` position in rect shader represents left side of the pixel we
should use the center of it when dealing with contiguous functions.
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Ceiling line position results in strikeout line being lower than
it should.
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Currently Alacritty only works on hardware which supports OpenGL 3.3 or
more, which can become problematic with older devices. This patch adds a
new GLES2 renderer, since it is much more widely supported, especially
on weaker hardware like phones or a Raspberry Pi.
While the GLES2 renderer is slower than the OpenGL 3.3+ version, it is
still significantly faster than software rendering. However because of
this performance difference it is only used when necessary and there
should be no difference for machines supporting OpenGL 3.3+.
The two renderers are largely independent and separated in the
`renderer/text/glsl3` and `renderer/text/gles2` modules. Separate
shaders are also required for text rendering. The rectangle rendering
for underlines and the visual bell works identically for both versions,
but does have some version-specific shader code.
Fixes #128.
Co-authored-by: Christian Duerr <contact@christianduerr.com>
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This finishes implementation of underline styles provided by
`CSI 4 : [1-5] m` escape sequence.
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Fixes #5873.
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The alpha is expected to be premultiplied from the text shader, so
we should apply it to the background color.
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Fixes #1628.
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In some cases it could be desired to apply 'background_opacity'
to all background colors instead of just 'colors.primary.background',
thus adding an 'colors.opaque_background_colors' option to control that.
Fixes #741.
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Fixes #910
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Currently Alacritty requires a separate `draw` call to OpenGL whenever a
new rectangle is rendered to the screen. With many rectangles visible,
this has a significant impact on rendering performance.
Instead of using separate draw calls, the new `RectRenderer` will build
a batch of rectangles for rendering. This makes sure that multiple
rectangles can be grouped together for single draw calls allowing a
reduced impact on rendering time.
Since this change is OpenGL 2 friendly, it should not make it more
complicated to transition away from the 3.3+ requirements like an
alternative instancing based implementation might have.
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Fixes #791.
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This commit is a follow-up to 7aafbb757d485c5ff065324464dde8b5322cdd921
which was an effort to remove copyright notice from files.
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The InstanceData type in the rendering subsystem was previously 17 f32s
plus one u8 which occupied a total of 72 bytes per instance. This meant
that for every character or background cell drawn, 72 bytes were sent to
the GPU. In the case of a 400x100 cell grid, a total of 2.9MB would be
sent.
This patch reduces InstanceData's size to 36 bytes, a 50% improvement!
Using the above example for comparison, a worst case of 1.44MB would be
transferred.
The motivation for this patch comes from macOS. Once the terminal grid
would reach a certain size, performance experienced a sharp and dramatic
drop (render times would go from ~3ms to ~16ms). I don't want to
speculate too much on the underlying issue, but suffice it to say that
this patch alleviates the problem in my testing.
While the performance impact was most significant on macOS, with
rendering times cut by more than 50% in some cases, this also results in
a measurable performance difference on other systems with high density
grids.
Co-authored-by: Christian Duerr <contact@christianduerr.com>
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This works around the problem that crates pushed to crates.io cannot
reference files outside of their crate directory.
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