Visual Shader Albedo appears desaturated/lightened from Color variables, except when using ColorParameter with Qualifier set to Instance (Vulkan Forward+)

[wawaboopboop]

Godot version

v4.1.2.stable.official [399c9dc39]

System information

Godot v4.1.2.stable - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3070 Laptop GPU (NVIDIA; 31.0.15.3699) - AMD Ryzen 9 5900HX with Radeon Graphics (16 Threads)

Issue description

VisualShader ColorConstant appears washed out compared to ColorParameter Instance

Steps to reproduce

• Add a mesh to 3d scene
• Add a new visual shader to the mesh
• edit the visual shader: create a colorConstant node and map to albedo output
• compare using the same color (same raw vec4 values) default value on a colorParameter node mapped to albedo output
  • compare setting Qualifier: None and Qualifier: Instance

Minimal reproduction project

ColourTest.zip

[Calinou]

This is likely a sRGB/linear conversion issue.

[jsjtxietian]

With color const the generated shader code: vec4 n_out2p0 = vec4(0.741176, 0.560784, 0.819608, 1.000000);

With ColorPara and instance qualifier: instance uniform vec4 ColorParameter : source_color = vec4(0.741176, 0.560784, 0.819608, 1.000000);

With ColorPara and none qualifier: uniform vec4 ColorParameter : source_color = vec4(0.741176, 0.560784, 0.819608, 1.000000);

[jsjtxietian]

Looks like the instance ColorPara is appearing differently from colorConstant and none ColorPara one. I hijacked the colorConst node, force it to do a linear2srgb conversion and it looks like instance ColorPara now. But the ColorPara with none qualifier still seem not have the conversion.