# PBR effect with direct roughness texture control
# This effect allows roughness textures to directly control roughness values
# instead of multiplying with material roughness value

fragment:
    defines: |
        #define USE_DIRECT_ROUGHNESS_TEXTURE 1

    inout: |
        uniform sampler2D p3d_Texture3;  // Roughness texture (direct control)

    material: |
        // Direct roughness texture control
        #if USE_DIRECT_ROUGHNESS_TEXTURE
            // Sample roughness value directly from texture
            float sampled_roughness = texture(p3d_Texture3, texcoord).x;
            
            // Use texture value directly instead of multiplying
            // This allows the texture to have full control over roughness values
            m.roughness = sampled_roughness;
            
            // Ensure minimum roughness to avoid rendering issues
            m.roughness = max(m.roughness, 0.01);
            
            // Debug: Ensure we're using the texture value
            // White areas = 1.0 (fully rough)
            // Gray areas = 0.5 (semi-rough) 
            // Black areas = 0.01 (smooth, but not zero to avoid issues)
        #else
            // Fallback to material roughness value
            m.roughness = mInput.roughness;
        #endif
        
        // Keep all other properties unchanged for stability
        m.basecolor = mInput.color;
        m.metallic = mInput.metallic;
        m.specular_ior = mInput.specular_ior;
        m.shading_model_param0 = mInput.arbitrary0;