Add support for widget transforms

Signed-off-by: Ritchie Frodomar <alkalinethunder@gmail.com>

src/AcidicGUI/Effects/IEffect.cs

@@ -1,3 +1,5 @@
+using Microsoft.Xna.Framework;
+
 namespace AcidicGUI.Effects;
 
 public interface IEffect
@@ -5,5 +7,5 @@ public interface IEffect
     int PassesCount { get; }
     
     void Use(int pass);
-    void UpdateOpacity(float opacity);
+    void UpdateWidgetParameters(float opacity, Matrix widgetTransform);
 }

src/AcidicGUI/GuiManager.cs

@@ -232,9 +232,7 @@ public sealed class GuiManager : IFontFamilyProvider
         renderer.SetLayer(-32768);
         
         foreach (Widget widget in topLevels)
-            widget.RenderInternal(renderer);
-
-        renderer.RenderBatches();
+            widget.RenderInternal(renderer, Matrix.Identity);
         
         isRendering = false;
     }

src/AcidicGUI/Widgets/Widget.cs

@@ -207,12 +207,11 @@ public abstract partial class Widget : IFontFamilyProvider
         return ourRect;
     }
     
-    internal void RenderInternal(GuiRenderer renderer)
+    internal void RenderInternal(GuiRenderer renderer, Matrix parentMatrix)
     {
         if (visibility != Visibility.Visible)
             return;
 
-        renderer.PushTransformMatrix(Transform.ComputedMatrix);
         
         effectOverride?.UpdateParameters(this, renderer);
         
@@ -226,7 +225,12 @@ public abstract partial class Widget : IFontFamilyProvider
         }
         
         renderer.RenderGuiMesh(cachedGeometry.Value);
+
+        Matrix matrix = parentMatrix * Transform.ComputedMatrix;
+        
+        renderer.PushTransformMatrix(matrix);
         renderer.RenderBatches(effectOverride, ComputedOpacity, clipRect);
+        renderer.PopTransformMatrix();
 
         effectOverride?.AfterRebuildGeometry(this, renderer);
         
@@ -234,10 +238,9 @@ public abstract partial class Widget : IFontFamilyProvider
         
         foreach (Widget child in children)
         {
-            child.RenderInternal(renderer);
+            child.RenderInternal(renderer, matrix);
         }
 
-        renderer.PopTransformMatrix();
     }
 
     public T GetCustomProperty<T>() where T : struct

src/AcidicGUI/Widgets/WidgetTransform.cs

@@ -21,7 +21,6 @@ public class WidgetTransform
 
             position = value;
             dirty = true;
-            widget.InvalidateGeometry();
         }
     }
 
@@ -35,7 +34,6 @@ public class WidgetTransform
 
             rotation = value;
             dirty = true;
-            widget.InvalidateGeometry();
         }
     }
 
@@ -49,7 +47,6 @@ public class WidgetTransform
 
             scale = value;
             dirty = true;
-            widget.InvalidateGeometry();
         }
     }
     

src/SociallyDistant.Framework/UI/Effects/BackgroundBlurWidgetEffect.cs

@@ -63,9 +63,9 @@ public sealed class BackgroundBlurWidgetEffect : IWidgetEffect,
         defaultUiShader.Use(pass);
     }
 
-    public void UpdateOpacity(float opacity)
+    public void UpdateWidgetParameters(float opacity, Matrix widgetTransform)
     {
-        defaultUiShader.UpdateOpacity(opacity);
+        defaultUiShader.UpdateWidgetParameters(opacity, widgetTransform);
     }
     
     public void UpdateParameters(Widget widget, GuiRenderer renderer)

src/SociallyDistant.Framework/UI/Effects/MonoGameEffect.cs

@@ -14,6 +14,8 @@ public class MonoGameEffect :
     private readonly       int             techniqueIndex;
     private readonly       EffectParameter transformMatrixParameter;
     private readonly       EffectParameter opacityParameter;
+    private                Matrix          widgetTransform = Matrix.Identity;
+    private                bool            mustUpdateTransform;
     private                Viewport        lastViewport;
     private                Matrix          transformMatrix;
     
@@ -26,7 +28,6 @@ public class MonoGameEffect :
 
         transformMatrixParameter = underlyingEffect.Parameters[TransformMatrixParameterName];
         opacityParameter = underlyingEffect.Parameters[OpacityParameterName];
-
     }
     
     public void Dispose()
@@ -34,8 +35,14 @@ public class MonoGameEffect :
         underlyingEffect.Dispose();
     }
 
-    public void UpdateOpacity(float opacity)
+    public void UpdateWidgetParameters(float opacity, Matrix widgetTransform)
     {
+        if (this.widgetTransform != widgetTransform)
+        {
+            mustUpdateTransform = true;
+            this.widgetTransform = widgetTransform;
+        }
+        
         opacityParameter.SetValue(opacity);
     }
     
@@ -45,11 +52,12 @@ public class MonoGameEffect :
 
         Viewport viewport = underlyingEffect.GraphicsDevice.Viewport;
 
-        if (viewport.Width != lastViewport.Width || viewport.Height != lastViewport.Height)
+        if (mustUpdateTransform || viewport.Width != lastViewport.Width || viewport.Height != lastViewport.Height)
         {
             lastViewport = viewport;
 
             Matrix.CreateOrthographicOffCenter(0, viewport.Width, viewport.Height, 0, -32768, 32768, out transformMatrix);
+            transformMatrix *= widgetTransform;
         }
 
         transformMatrixParameter.SetValue(transformMatrix);

src/SociallyDistant.Framework/UI/GuiService.cs

@@ -164,7 +164,7 @@ public sealed class GuiService :
         IEffect effectToUse = effectOverride ?? defaultEffect;
         
         effectToUse.Use(0);
-        effectToUse.UpdateOpacity(opacity);
+        effectToUse.UpdateWidgetParameters(opacity, widgetTransform ?? Matrix.Identity);
         device.Textures[0] = texture ?? white;
         device.SamplerStates[0] = SamplerState.LinearClamp;
         device.BlendState = blendState;