remove sunDisk in skybox at FL0 (#9675)

Author: PatRibas

filament/src/materials/skybox.mat

@@ -40,9 +40,10 @@ fragment {
             sky = vec4(textureCube(materialParams_skybox, variable_eyeDirection.xyz).rgb, 1.0);
 #else
             sky = vec4(textureLod(materialParams_skybox, variable_eyeDirection.xyz, 0.0).rgb, 1.0);
-#endif
             sky.rgb *= frameUniforms.iblLuminance;
+#endif  // MATERIAL_FEATURE_LEVEL == 0
         }
+#if MATERIAL_FEATURE_LEVEL > 0
         if (materialParams.showSun != 0 && frameUniforms.sun.w >= 0.0) {
             vec3 direction = normalize(variable_eyeDirection.xyz);
             // Assume the sun is a sphere
@@ -53,6 +54,7 @@ fragment {
             float gradient = pow(1.0 - saturate(x), frameUniforms.sun.w);
             sky.rgb = sky.rgb + gradient * sun;
         }
+#endif  // MATERIAL_FEATURE_LEVEL > 0
         material.baseColor = sky;
     }
 }

libs/filamat/src/shaders/UibGenerator.cpp

@@ -148,16 +148,16 @@ BufferInterfaceBlock const& UibGenerator::getPerViewUib() noexcept  {
             { "dynReserved2",           0, Type::INT                     },
 
             { "iblLuminance",           0, Type::FLOAT,  Precision::DEFAULT, FeatureLevel::FEATURE_LEVEL_0 },
-            { "iblRoughnessOneLevel",   0, Type::FLOAT,  Precision::DEFAULT, FeatureLevel::FEATURE_LEVEL_0 },
+            { "iblRoughnessOneLevel",   0, Type::FLOAT },
             { "iblSH",                  9, Type::FLOAT3                  },
 
             // ------------------------------------------------------------------------------------
             // Directional Lighting [variant: DIR]
             // ------------------------------------------------------------------------------------
-            { "lightDirection",         0, Type::FLOAT3, Precision::HIGH, FeatureLevel::FEATURE_LEVEL_0 },
+            { "lightDirection",         0, Type::FLOAT3, Precision::HIGH },
             { "padding0",               0, Type::FLOAT                   },
-            { "lightColorIntensity",    0, Type::FLOAT4, Precision::DEFAULT, FeatureLevel::FEATURE_LEVEL_0 },
-            { "sun",                    0, Type::FLOAT4, Precision::DEFAULT, FeatureLevel::FEATURE_LEVEL_0 },
+            { "lightColorIntensity",    0, Type::FLOAT4, Precision::DEFAULT },
+            { "sun",                    0, Type::FLOAT4, Precision::DEFAULT },
             { "shadowFarAttenuationParams", 0, Type::FLOAT2, Precision::HIGH },
 
             // ------------------------------------------------------------------------------------