Re: Re: Wayland libdecor interoperability between FLTK and GLFW
Gonzalo Garramuño
Apr 20, 2024
On 20/4/24 07:46, Manolo wrote:
I see no way that libdecor can mess up OpenGL drawing. Are you mixing
headers and shared libs of distinct builds?
No. It is a bug, but not with libdecor. The screen should be cleared,
but currently it isn't.
In my program, I call:
float r = 0.F, g = 0.F, b = 0.F, a = 0.F;
glViewport(0, 0, pixel_w(), pixel_h());
glClearStencil(0);
glClearColor(r, g, b, a);
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
The alpha channel is intentionally set as 0, so that transparency can be
grabbed properly. On Wayland, under FLTK at least, this messes it up,
as it lets the background go through. Setting the alpha to 1 fixes it,
but that screws up capturing the OpenGL transparency with a
glReadPixel() and similar. Not sure if it is an FLTK problem or a
Wayland problem. But it is a bug.
--
Gonzalo Garramuño
ggarra13@gmail.com
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