crt-geom black screen

[Tatsuya79]

crt-geom gives a black screen by default but changing some parameters in the preview settings makes it work.
Saving a new preset with some changes gives a valid glslp.

Not sure what the problem is: some default values not applied?

[hizzlekizzle]

Works fine here. What GPU are you testing on? It's probably related to a rounding issue with the curvature code.

Does it start working when you change any setting? Or just certain setting(s)?

[Tatsuya79]

Nvidia and certain settings like curvature or tilting.

[Zenjir0]

I too am running into a black screen when loading the crt-geom.glsl preset on any core.

System 1: Fails
I am using NVIDIA GTX 770 with 391.01 drivers (supports OpenGL 4.3), on Windows 7 x64.
Utilizing the OpenGL backend driver in Retroarch (version 1.7.1)
This system is hooked up to a VIZIO 50" 4K TV (running at 1080p output) HDMI connection.

System 2: Works
On another system it loads just fine.
Same NVIDIA driver as before, but the card is a GTX 1070 (supports OpenGL 4.5), also on Windows 7 x64. Utilizing the OpenGL backend driver in Retroarch (version 1.7.1)
This system is hooked up to an Acer 21" computer monitor (1080p output) DVI connection.

Let me know if I need to provide more information.

UPDATE: Using the CG Shader works on the System 1. Will be using that in the mean time.

[Ebsy]

Started experimenting with shaders recently and saw the same issues. like @Zenjir0 I'm running a GTX 1070 with the gl driver on Windows 10. CG Shader is working fine. Tried the GLSL shader (crt-royale) and tried to apply the geom mode (like in the CG shader) and saw a blank screen. I messed around the the horiz tilt parameter until I got something to display which worked to a point but as you can see from the images they're distorted so it looks like a rounding issue to me?

Album - here
https://imgur.com/a/wXOzQgu

Geom mode 0, 1, 2 and 3.

No tweaks apart from 'tilt angle x' and I had to use a negative value to get anything to display. @hizzlekizzle could you take another look at this? I'd much rather use the glsl shaders over the cg ones. Anything I can do to help/test just let me know.

[Zenjir0]

An update on my research.

The System 1 setup is now functioning properly after a driver update. It's been over a year since I reported the issue and I guess NVIDIA fixed something that was wrong at the driver level. GLSL crt-geom shader is working fine now.

@Ebsy What is odd is that your GTX 1070 is the one that is failing while mine was the opposite. 1070 worked but the 770 failed.

[hizzlekizzle]

@Ebsy oh, interesting. This issue is about the crt-geom shader, not crt-royale, but I'm very surprised that you were able to get anything out of those geom modes! I thought they were just straight-up broken and had no idea where to even begin, but it seems like I was closer than I thought. I might be able to work with this!

[Ebsy]

Sorry for the confusion guys. I searched for an existing issue and saw 'geom' and as I was having a problem with the 'geom' modes... haha. @Zenjir0 crt-geom is indeed working fine for me on the 1070 (as you yourself saw)

As hizzlekizzle says my particular issue is with the crt-royale geom modes. @hizzlekizzle that's great news, thanks