Uniform block is empty and will be ignored!

Error message

Uniform block {resource_name} is empty and will be ignored!

What it means

In the GL backend, shader resource definitions of kind PropertyGroup are translated into GLSL uniform blocks. When the PropertyGroup has no fields, no meaningful uniform block can be emitted, so the shader compiler skips it and logs this warning instead of generating invalid GLSL.

Solutions

Add at least one property to the PropertyGroup in the shader definition
Remove the empty resource definition from the shader entirely
If the group is conditionally filled, guard its creation so empty groups are never registered

Example fix

// before
ShaderResourceDefinition { name: "Uniforms", kind: ShaderResourceKind::PropertyGroup(vec![]) }
// after
ShaderResourceDefinition { name: "Uniforms", kind: ShaderResourceKind::PropertyGroup(vec![ShaderProperty::Color("Tint".into())]) }

Defensive patterns

Strategy: validation

Validate before calling

// before building the shader
assert!(!fields.is_empty(), "property group '{}' has no fields; it will be ignored", name);

Prevention

Always populate property groups with at least one property before registering them
Watch the engine log for 'is empty and will be ignored' during shader loading
Remove unused resource definitions during shader refactors

When it happens

Trigger: Declaring a ShaderResourceDefinition with ShaderResourceKind::PropertyGroup backed by an empty fields vec in a custom shader (e.g. via ShaderBuilder or a .shader file with an empty property group).

Common situations: Hand-written shaders where a property group was created but no properties were ever added; shader code generated or refactored so all fields were removed but the group definition was left behind.

Understand the failure class

Background: "must not be empty", "cannot be empty" — required-field validation errors across open-source libraries — this error's family across 41 libraries.

Related errors

AI-assisted analysis of FyroxEngine/Fyrox@76c91aad8e (2026-09-10). Data as JSON: /api/errors/40fb5959215502bb. Report an issue: GitHub.

Appendix: source

Thrown at fyrox-graphics-gl/src/program.rs:203

                    }
                }
            }
        }

        // Generate appropriate texture binding points and uniform blocks for the specified properties.

        let mut texture_bindings = String::new();

        for property in resources {
            let resource_name = &property.name;
            match property.kind {
                ShaderResourceKind::Texture { kind, .. } => {
                    let glsl_name = glsl_sampler_name(kind);
                    texture_bindings += &format!("uniform {glsl_name} {resource_name};\n");
                }
                ShaderResourceKind::PropertyGroup(ref fields) => {
                    if fields.is_empty() {
                        Log::warn(format!(
                            "Uniform block {resource_name} is empty and will be ignored!"
                        ));
                        continue;
                    }
                    let mut block = format!("struct T{resource_name}{{\n");
                    for field in fields {
                        let field_name = &field.name;
                        match field.kind {
                            ShaderPropertyKind::Float { .. } => {
                                block += &format!("\tfloat {field_name};\n");
                            }
                            ShaderPropertyKind::FloatArray { max_len, .. } => {
                                block += &format!("\tfloat {field_name}[{max_len}];\n");
                            }
                            ShaderPropertyKind::Int { .. } => {
                                block += &format!("\tint {field_name};\n");
                            }
                            ShaderPropertyKind::IntArray { max_len, .. } => {

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