Add new Lighting debug view mode for both diffuse and specular lighting preview without material colors

Source/Editor/Viewport/EditorViewport.cs

@@ -2087,6 +2087,7 @@ namespace FlaxEditor.Viewport
             new ViewModeOptions(ViewMode.Unlit, "Unlit", Editor.Instance.Options.Options.Input.Unlit),
             new ViewModeOptions(ViewMode.NoPostFx, "No PostFx", Editor.Instance.Options.Options.Input.NoPostFX),
             new ViewModeOptions(ViewMode.Wireframe, "Wireframe", Editor.Instance.Options.Options.Input.Wireframe),
+            new ViewModeOptions(ViewMode.Lighting, "Lighting"),
             new ViewModeOptions(ViewMode.LightBuffer, "Light Buffer", Editor.Instance.Options.Options.Input.LightBuffer),
             new ViewModeOptions(ViewMode.Reflections, "Reflections Buffer", Editor.Instance.Options.Options.Input.ReflectionsBuffer),
             new ViewModeOptions("GBuffer", new[]

Source/Engine/Graphics/Enums.h

@@ -1010,6 +1010,11 @@ API_ENUM() enum class ViewMode
     /// Draw Global Sign Distant Field (SDF) overdraw to visualize performance of SDF tracing.
     /// </summary>
     GlobalSDFOverdraw = 27,
+
+    /// <summary>
+    /// Draw lighting without diffuse color from materials to inspect both diffuse and specular light contributions.
+    /// </summary>
+    Lighting = 28,
 };
 
 /// <summary>

Source/Engine/Renderer/LightPass.cpp

@@ -175,7 +175,7 @@ void LightPass::RenderLights(RenderContextBatch& renderContextBatch, GPUTextureV
     const bool disableSpecular = (view.Flags & ViewFlags::SpecularLight) == ViewFlags::None;
 
     // Check if debug lights
-    if (renderContext.View.Mode == ViewMode::LightBuffer)
+    if (renderContext.View.Mode == ViewMode::LightBuffer || renderContext.View.Mode == ViewMode::Lighting)
     {
         // Clear diffuse
         if (!_psClearDiffuse)