Material - enbale/disable metallic scale according to texture selection

Remark: resolves GitHub issue https://github.com/o3de/o3de/issues/2647 - ATOM-15614

Signed-off-by: Adi Bar-Lev <82479970+Adi-Amazon@users.noreply.github.com>

Gems/Atom/Feature/Common/Assets/Materials/Types/EnhancedPBR.materialtype

@@ -1574,15 +1574,6 @@
                 "shaderOption": "o_baseColor_useTexture"
             }
         },
-        {
-            "type": "UseTexture",
-            "args": {
-                "textureProperty": "metallic.textureMap",
-                "useTextureProperty": "metallic.useTexture",
-                "dependentProperties": ["metallic.textureMapUv"],
-                "shaderOption": "o_metallic_useTexture"
-            }
-        },
         {
             "type": "UseTexture",
             "args": {
@@ -1649,6 +1640,12 @@
                 "file": "StandardPBR_Roughness.lua"
             }
         },
+        {
+            "type": "Lua",
+            "args": {
+                "file": "StandardPBR_Metallic.lua"
+            }
+        },
         {
             "type": "Lua",
             "args": {

Gems/Atom/Feature/Common/Assets/Materials/Types/StandardMultilayerPBR.materialtype

@@ -2698,16 +2698,12 @@
             }
         },
         {
-            "type": "UseTexture",
+            "type": "Lua",
             "args": {
-                "textureProperty": "layer1_metallic.textureMap",
+                "file": "StandardPBR_Metallic.lua",
-                "useTextureProperty": "layer1_metallic.useTexture",
+                "propertyNamePrefix": "layer1_",
-                "dependentProperties": ["layer1_metallic.textureMapUv"],
+                "srgNamePrefix": "m_layer1_",
-                "shaderTags": [ 
+                "optionsNamePrefix": "o_layer1_"
-                    "ForwardPass",
-                    "ForwardPass_EDS"
-                ],
-                "shaderOption": "o_layer1_o_metallic_useTexture"
             }
         },
         {
@@ -2835,16 +2831,12 @@
             }
         },
         {
-            "type": "UseTexture",
+            "type": "Lua",
             "args": {
-                "textureProperty": "layer2_metallic.textureMap",
+                "file": "StandardPBR_Metallic.lua",
-                "useTextureProperty": "layer2_metallic.useTexture",
+                "propertyNamePrefix": "layer2_",
-                "dependentProperties": ["layer2_metallic.textureMapUv"],
+                "srgNamePrefix": "m_layer2_",
-                "shaderTags": [ 
+                "optionsNamePrefix": "o_layer2_"
-                    "ForwardPass",
-                    "ForwardPass_EDS"
-                ],
-                "shaderOption": "o_layer2_o_metallic_useTexture"
             }
         },
         {
@@ -2963,8 +2955,8 @@
             "args": {
                 "textureProperty": "layer3_baseColor.textureMap",
                 "useTextureProperty": "layer3_baseColor.useTexture",
-                "dependentProperties": ["layer3_baseColor.textureMapUv", "layer3_baseColor.textureBlendMode"],
+                "dependentProperties": [ "layer3_baseColor.textureMapUv", "layer3_baseColor.textureBlendMode" ],
-                "shaderTags": [ 
+                "shaderTags": [
                     "ForwardPass",
                     "ForwardPass_EDS"
                 ],
@@ -2972,16 +2964,12 @@
             }
         },
         {
-            "type": "UseTexture",
+            "type": "Lua",
             "args": {
-                "textureProperty": "layer3_metallic.textureMap",
+                "file": "StandardPBR_Metallic.lua",
-                "useTextureProperty": "layer3_metallic.useTexture",
+                "propertyNamePrefix": "layer3_",
-                "dependentProperties": ["layer3_metallic.textureMapUv"],
+                "srgNamePrefix": "m_layer3_",
-                "shaderTags": [ 
+                "optionsNamePrefix": "o_layer3_"
-                    "ForwardPass",
-                    "ForwardPass_EDS"
-                ],
-                "shaderOption": "o_layer3_o_metallic_useTexture"
             }
         },
         {

Gems/Atom/Feature/Common/Assets/Materials/Types/StandardPBR.materialtype

@@ -1104,15 +1104,6 @@
                 "shaderOption": "o_baseColor_useTexture"
             }
         },
-        {
-            "type": "UseTexture",
-            "args": {
-                "textureProperty": "metallic.textureMap",
-                "useTextureProperty": "metallic.useTexture",
-                "dependentProperties": ["metallic.textureMapUv"],
-                "shaderOption": "o_metallic_useTexture"
-            }
-        },
         {
             "type": "UseTexture",
             "args": {
@@ -1179,6 +1170,12 @@
                 "file": "StandardPBR_Roughness.lua"
             }
         },
+        {
+            "type": "Lua",
+            "args": {
+                "file": "StandardPBR_Metallic.lua"
+            }
+        },
         {
             "type": "Lua",
             "args": {

Gems/Atom/Feature/Common/Assets/Materials/Types/StandardPBR_Metallic.lua

@@ -0,0 +1,43 @@
+--------------------------------------------------------------------------------------
+--
+-- Copyright (c) Contributors to the Open 3D Engine Project.
+-- For complete copyright and license terms please see the LICENSE at the root of this distribution.
+--
+-- SPDX-License-Identifier: Apache-2.0 OR MIT
+--
+--
+--
+----------------------------------------------------------------------------------------------------
+
+function GetMaterialPropertyDependencies()
+    return {"metallic.textureMap", "metallic.useTexture"}
+end
+ 
+function GetShaderOptionDependencies()
+    return {"o_metallic_useTexture"}
+end
+
+function Process(context)
+    local textureMap = context:GetMaterialPropertyValue_Image("metallic.textureMap")
+    local useTexture = context:GetMaterialPropertyValue_bool("metallic.useTexture")
+    context:SetShaderOptionValue_bool("o_metallic_useTexture", useTexture and textureMap ~= nil)
+end
+
+function ProcessEditor(context)
+    local textureMap = context:GetMaterialPropertyValue_Image("metallic.textureMap")
+    local useTexture = context:GetMaterialPropertyValue_bool("metallic.useTexture")
+
+    if(nil == textureMap) then
+        context:SetMaterialPropertyVisibility("metallic.useTexture", MaterialPropertyVisibility_Hidden)
+        context:SetMaterialPropertyVisibility("metallic.textureMapUv", MaterialPropertyVisibility_Hidden)
+        context:SetMaterialPropertyVisibility("metallic.factor", MaterialPropertyVisibility_Enabled)
+    elseif(not useTexture) then
+        context:SetMaterialPropertyVisibility("metallic.useTexture", MaterialPropertyVisibility_Enabled)
+        context:SetMaterialPropertyVisibility("metallic.textureMapUv", MaterialPropertyVisibility_Disabled)
+        context:SetMaterialPropertyVisibility("metallic.factor", MaterialPropertyVisibility_Enabled)
+    else
+        context:SetMaterialPropertyVisibility("metallic.useTexture", MaterialPropertyVisibility_Enabled)
+        context:SetMaterialPropertyVisibility("metallic.textureMapUv", MaterialPropertyVisibility_Enabled)
+        context:SetMaterialPropertyVisibility("metallic.factor", MaterialPropertyVisibility_Hidden)
+    end
+end