Scanlines mode options or glsl shader support?

[RetroD]

Would it be possible at all to add some options for scanlines such as opacity (something like 25, 50, 75, 100%) and a filter to soften the image a bit? Even better, can glsl shader support be added so that we can use the same shader library from libretro? (all to be saved globally in the amiberry.conf of course :P )

Don't know about the feasibility for such requests, and I understand is not a priority by any means, but I thought I'd throw it out here to see what you guys think :)

Running 2.24 on retropie stretch on rpi3

[midwan]

Yes, I was planning to look into this at some point in the future... :)

[mrfomt]

This would be great if you could add to Amiberry!

[sphaero]

Any pointers where to start? I know uae4arm-rpi has some shader support. I'm not even sure yet if Amiberry is even using OpenGLES. 🤔

[midwan]

@sphaero Amiberry uses SDL2 but does not explicitly request a GL context to open the window.
To use GL shaders, we'll have to change that obviously.

I didn't have time to experiment with this yet, but if you want to help with it, pull requests are always welcome! :)

[sphaero]

FWIW, I've just build amiberry from source with USE_OPENGL=ON. I had to change CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 74a8d5ab..04468ae2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,7 +38,7 @@ set(PROJECT_COMPANY_NAMESPACE "com.blitterstudio")  # Reverse domain name notati
 include(GNUInstallDirs)
 
 include(cmake/StandardProjectSettings.cmake)
-include(cmake/Dependencies.cmake)
 include(cmake/SourceFiles.cmake)
+include(cmake/Dependencies.cmake)

It builds fine but when I run it I get a few first frames from kickstart booting but it then remains black. When I kill it spits Vertex Shader Error: Vertex Shader Error: Vertex Shader Error:

Still quite experimental I guess?

[midwan]

Yeah, sorry - this is not implemented completely yet. There are some bugs which I haven't had a chance to fix there.

[sphaero]

No worries, I can only salute your work. It seems I get nostalgic every time around christmas and start firing up amiga stuff. It's just too little time to acquaint myself with the source to do something 😞

[filevans]

Yeah, sorry - this is not implemented completely yet. There are some bugs which I haven't had a chance to fix there.

hello is there a way to get any CRT scanline shaders on amiberry on the Pi now?
thanks

[midwan]

@filevans
No, that's not implemented yet. I'm hoping it will work eventually, but I haven't had enough time to learn the details of why my OpenGL implementation is broken, yet.

[filevans]

@midwan I see, please could it be looked at? As scanlines are really needed to look authentic how an Amiga used to look. Not sure if vulkan is possible instead which uses GLSL?

[midwan]

It will be looked at, at some point. :)