Unknown uniform _main_pos_map_0[0] in cursor and borders programs

[kbielefe]

I am getting the following error:

[101 21:40:02.433905] Unknown uniform in cursor program

If I comment out that fatal error and the check for leftover uniforms, I get:

[101 21:44:40.638541] Unknown uniform in borders program: _main_pos_map_0[0]

Commenting out that fatal error and check for leftover uniforms makes kitty work correctly, as far as I can tell.

$ python . --debug-config
python3 setup.py 
CC: gcc (7, 3)
kitty 0.8.4 (cc910f6b79) created by Kovid Goyal
Linux karl-home-desktop 4.15.15-1-ARCH #1 SMP PREEMPT Sat Mar 31 23:59:25 UTC 2018 x86_64
Running under: X11
Arch Linux \r (\l)
LSB_VERSION=1.4
DISTRIB_ID=Arch
DISTRIB_RELEASE=rolling
DISTRIB_DESCRIPTION="Arch Linux"
Loaded config files: /home/karl/.config/kitty/kitty.conf

Config options different from defaults:
background_opacity   0.8
font_family          Inconsolata
font_size            14.0
inactive_text_alpha  0.8

libGL is from the nvidia-340xx-utils package, which seems to be the main difference from my computer at work which works fine.

[kovidgoyal]

That's a broken GL driver. Not much I can do about it. You can make it work by ignoring the sanity checks, but that just means other random things might break later on.

[kovidgoyal]

To elaborate, the GL driver is incorrectly treating const variables in the shaders as uniforms.

[eefano]

You are basically cutting out all the pre-gtx nvidia card owners from using your program. Not a smart move, imho. Maybe you should use older GLSL specifications in your shaders or provide a workaround.

[kovidgoyal]

I'm widely known for my extreme stupidity.

[omeid]

Here is a patch that ignores that error, everything seems to work okay with Nvidia 440xx so far.

shaders.c	2020-05-09 15:18:21.000000000 +1000
--- shaders.c	2020-05-18 15:18:09.424911404 +1000
*************** init_borders_program(void) {
*** 666,672 ****
          else if SET_LOC(active_border_color);
          else if SET_LOC(inactive_border_color);
          else if SET_LOC(bell_border_color);
!         else { fatal("Unknown uniform in borders program: %s", p->uniforms[i].name); return; }
      }
      if (left) { fatal("Left over uniforms in borders program"); return; }
  #undef SET_LOC
--- 666,676 ----
          else if SET_LOC(active_border_color);
          else if SET_LOC(inactive_border_color);
          else if SET_LOC(bell_border_color);
!         else if (strcmp(p->uniforms[i].name, "_main_pos_map_0[0]") == 0){
!           left++;
!           log_error("ignoring unexpected uniform %i -> _main_pos_map_0[0]", i);
!         }
!         else { fatal("Unknown uniform in borders program: %s, %i", p->uniforms[i].name, i); return; }
      }
      if (left) { fatal("Left over uniforms in borders program"); return; }
  #undef SET_LOC

[kovidgoyal]

That will break when kitty tries to draw borders around a window.

[omeid]

How can I trigger drawing of borders? I am using i3, so that might be why I don't see it?

[omeid]

i tried new_window and new_os_window and it draws borders fine. 🤔

[kovidgoyal]

Use a layout other than stack and have multipe kitty windows in a single
OS window.

[omeid]

Created multiple new_window inside a single OS window, changed layout in various ways, cycling with next_layout, everything seems okay.

[omeid]

For clarity, here is a git diff instead of a diff-patch:

diff --git a/kitty/shaders.c b/kitty/shaders.c
index 342c2d8d..0933c06b 100644
--- a/kitty/shaders.c
+++ b/kitty/shaders.c
@@ -666,7 +666,11 @@ init_borders_program(void) {
         else if SET_LOC(active_border_color);
         else if SET_LOC(inactive_border_color);
         else if SET_LOC(bell_border_color);
-        else { fatal("Unknown uniform in borders program: %s", p->uniforms[i].name); return; }
+        else if (strcmp(p->uniforms[i].name, "_main_pos_map_0[0]") == 0){
+          left++;
+          log_error("ignoring unexpected uniform %i -> _main_pos_map_0[0]", i);
+        }
+        else { fatal("Unknown uniform in borders program: %s, %i", p->uniforms[i].name, i); return; }
     }
     if (left) { fatal("Left over uniforms in borders program"); return; }
 #undef SET_LOC