Questions[glsl](ubuntu)

I want to install glslc , which is one of the tools of shaderc, so I can compile GLSL into Vulkan's SPIR-V shader format.

Is there a package that already provides it or I should build it from source?

Apparently it's not packed on debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=890472

I noted it appears to be included in the LunarG Vulkan SDK: https://vulkan.lunarg.com/doc/sdk/1.2.141.2/linux/getting_started.html

From own LunarG website, it's not yet packed for 20.04, only 16.04 and 18.04. This situation may change soon.

I can enable the color filter, toggle screen filtering with super-d, and then switch filters with ctrl-super-s, but only builtin filters work.

I tried adding these filters (fragment shaders)

• https://www.geeks3d.com/20091009/shader-library-night-vision-post-processing-filter-glsl/
• https://github.com/twostraws/ShaderKit

Compiz doesn't complain when I select the .fsh file, or when switching to that filter. It just doesn't apply the expected filters.

Are the files I'm using possibly incompatible with Compiz? Does compiz support all GLSL, or just certain features?

I've got compiz version 0.9.14.0 with Ubuntu 19.04 running unity desktop.

I'm basically trying to get a redshift effect at the touch of a key.

I have stumbled into a basic OpenGL driver bug and I'm not sure where to report them.

Here's how the driver identifies itself and how we create the RC:

OpenGL vendor: X.Org
OpenGL renderer: AMD CARRIZO (DRM 3.26.0, 4.18.0-13-generic, LLVM 7.0.0)
OpenGL version: 4.4 (Compatibility Profile) Mesa 18.2.2
v - using GL version 2.0 (core)

It has ARB_gpu_shader5 in its extension list but not EXT_gpu_shader4.

This shader fails to compile

#version 120
#extension GL_EXT_gpu_shader4: enable
...
uniform usampler2D u_stencilTexture;        

With this error:

interaction VFWARNING:CompileShader(glprogs/interaction.fs): FAILED
0:2(12): warning: extension `GL_EXT_gpu_shader4' unsupported in fragment shader
0:27(20): error: syntax error, unexpected NEW_IDENTIFIER, expecting '{'

So my question is: how do I get the version 120 shader with the usampler extension to build on seemingly Opengl-4.4 capable GPU/driver?

Preferably in a cross-platform, cross-vendor way.

Please note that the same shader compiles just fine on a wide range of devices/drivers on both Linux and Windows.