rendering: formalize legacy material shader pass hints

engine/src/Resources/Material/Material.cpp

@@ -323,7 +323,8 @@ void Material::Release() {
     m_shader.Reset();
     m_renderQueue = static_cast<Core::int32>(MaterialRenderQueue::Geometry);
     m_renderState = MaterialRenderState();
-    m_shaderPass.Clear();
+    m_hasRenderStateOverride = false;
+    m_legacyShaderPassHint.Clear();
     m_tags.Clear();
     m_keywordSet.enabledKeywords.Clear();
     m_properties.Clear();
@@ -353,12 +354,31 @@ void Material::SetRenderQueue(MaterialRenderQueue renderQueue) {
 
 void Material::SetRenderState(const MaterialRenderState& renderState) {
     m_renderState = renderState;
+    m_hasRenderStateOverride = true;
+    MarkChanged(false);
+}
+
+void Material::SetRenderStateOverrideEnabled(bool enabled) {
+    m_hasRenderStateOverride = enabled;
+    MarkChanged(false);
+}
+
+void Material::SetLegacyShaderPassHint(const Containers::String& shaderPass) {
+    m_legacyShaderPassHint = shaderPass;
+    MarkChanged(false);
+}
+
+void Material::ClearLegacyShaderPassHint() {
+    if (m_legacyShaderPassHint.Empty()) {
+        return;
+    }
+
+    m_legacyShaderPassHint.Clear();
     MarkChanged(false);
 }
 
 void Material::SetShaderPass(const Containers::String& shaderPass) {
-    m_shaderPass = shaderPass;
-    MarkChanged(false);
+    SetLegacyShaderPassHint(shaderPass);
 }
 
 void Material::SetTag(const Containers::String& name, const Containers::String& value) {
@@ -1100,7 +1120,7 @@ void Material::UpdateMemorySize() {
     m_memorySize = m_constantBufferData.Size() +
                    m_constantLayout.Size() * sizeof(MaterialConstantFieldDesc) +
                    sizeof(MaterialRenderState) +
-                   m_shaderPass.Length() +
+                   m_legacyShaderPassHint.Length() +
                    m_tags.Size() * sizeof(MaterialTagEntry) +
                    m_keywordSet.enabledKeywords.Size() * sizeof(Containers::String) +
                    m_textureBindings.Size() * sizeof(MaterialTextureBinding) +