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Glow canvas handles transparency differently from wgpu #1018

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akhilman opened this issue Sep 2, 2021 · 3 comments · Fixed by #1021
Closed

Glow canvas handles transparency differently from wgpu #1018

akhilman opened this issue Sep 2, 2021 · 3 comments · Fixed by #1021
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question Further information is requested

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@akhilman
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akhilman commented Sep 2, 2021

Here is the moon's shadow that becomes transparent such you can see text from window below.
image

All I did is changed backend to glow:

diff --git a/examples/solar_system/Cargo.toml b/examples/solar_system/Cargo.toml
index 327fe0aa..bd355c9a 100644
--- a/examples/solar_system/Cargo.toml
+++ b/examples/solar_system/Cargo.toml
@@ -6,5 +6,5 @@ edition = "2018"
 publish = false
 
 [dependencies]
-iced = { path = "../..", features = ["canvas", "tokio", "debug"] }
+iced = { path = "../..", features = ["glow", "glow_canvas", "tokio", "debug"] }
 rand = "0.8.3"
@hecrj
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hecrj commented Sep 2, 2021

I cannot reproduce the issue.

Would you care to share some more information about your environment and hardware?

@hecrj hecrj added the question Further information is requested label Sep 2, 2021
@akhilman
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akhilman commented Sep 2, 2021

I have gnome desktop running on wayland. I believe the wayland is the main reason. With X11 I have no such issue.

@akhilman
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akhilman commented Sep 2, 2021

I can reproduce this issue in Fedora 34 workstation inside kvm virtual machine.

akhilman added a commit to akhilman/iced that referenced this issue Sep 2, 2021
@akhilman
Fix window holes behind transparent objects
bb991aa 
Without this change, the transparent objects composed over the opaque
background creates the transparency of the entire window through which
the desktop wallpaper could be seen.
This problem manifested itself with glow backend and wayland compositor
(gnome).

This patch completely eliminates this problem. With it, the final image
produced by glow backend corresponds to the image produced by the wgpu
backend.

Fixes iced-rs#1018
@akhilman akhilman mentioned this issue Sep 2, 2021
Closed
akhilman added a commit to akhilman/iced that referenced this issue Sep 2, 2021
@akhilman
Fix window holes behind transparent objects
666f676 
Without this change, the transparent objects composed over the opaque
background creates the transparency of the entire window through which
the desktop wallpaper could be seen.
This problem manifested itself with glow backend and wayland compositor
(gnome).

This patch completely eliminates this problem. With it, the final image
produced by glow backend corresponds to the image produced by the wgpu
backend.

Fixes iced-rs#1018
@akhilman akhilman mentioned this issue Sep 2, 2021
Merged
derezzedex pushed a commit to derezzedex/iced that referenced this issue Nov 22, 2021
@akhilman @derezzedex
Fix window holes behind transparent objects
354bd28 
Without this change, the transparent objects composed over the opaque
background creates the transparency of the entire window through which
the desktop wallpaper could be seen.
This problem manifested itself with glow backend and wayland compositor
(gnome).

This patch completely eliminates this problem. With it, the final image
produced by glow backend corresponds to the image produced by the wgpu
backend.

Fixes iced-rs#1018
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