The only devices that supported less than 4 (0) have been removed from Compat (Mali-T624, Mali-T628, Mail-720). With those gone all remaining devices appear to support at least 4 storage buffers and storage textures in fragment shaders.
Note: the min limit in core is 8 so these limits are still needed for compat mode. We can just raise them to 4 from their current 0 limit.
GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS
%of
limit cnt total
--------- --- -----
4 : 1333 39.6%
35 : 1144 34.0%
8 : 379 11.3%
0 : 356 10.6%
16 : 71 2.1%
12 : 40 1.2%
64 : 25 0.7%
10 : 10 0.3%
60 : 4 0.1%
32 : 2 0.1%
8192 : 1 0.0%
devices where GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS < 4
Mali-T720: (various devices...)
Mali-T624: (various devices...)
Mali-T628: (various devices...)
Adreno (TM) 540 : Redmi Note 5A
ANGLE (NVIDIA GeForce GTX 1050 Ti Direct3D11 vs_5_0 ps_5_0) : ASUS_I001DA
ANGLE (AMD Radeon HD 6800 Series Direct3D11 vs_5_0 ps_5_0) : MI 5
ANGLE (Intel(R) HD Graphics 4400 Direct3D11 vs_5_0 ps_5_0) : ONEPLUS A3010
GL_MAX_FRAGMENT_IMAGE_UNIFORMS
%of
limit cnt total
--------- --- -----
8 : 1573 46.7%
4 : 1333 39.6%
0 : 356 10.6%
32 : 52 1.5%
96 : 22 0.7%
16 : 17 0.5%
24 : 7 0.2%
60 : 4 0.1%
8192 : 1 0.0%
devices where GL_MAX_FRAGMENT_IMAGE_UNIFORMS < 4
Mali-T720: (various devices...)
Mali-T624: (various devices...)
Mali-T628: (various devices...)
Adreno (TM) 540 : Redmi Note 5A
ANGLE (NVIDIA GeForce GTX 1050 Ti Direct3D11 vs_5_0 ps_5_0) : ASUS_I001DA
ANGLE (AMD Radeon HD 6800 Series Direct3D11 vs_5_0 ps_5_0) : MI 5
ANGLE (Intel(R) HD Graphics 4400 Direct3D11 vs_5_0 ps_5_0) : ONEPLUS A3010
The only devices that supported less than 4 (0) have been removed from Compat (Mali-T624, Mali-T628, Mail-720). With those gone all remaining devices appear to support at least 4 storage buffers and storage textures in fragment shaders.
Note: the min limit in core is 8 so these limits are still needed for compat mode. We can just raise them to 4 from their current 0 limit.