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220 行
11 KiB
220 行
11 KiB
using System;
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using System.Linq;
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using UnityEngine;
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namespace UnityEditor.Rendering.Universal
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{
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static class ShadowCascadeSplitGUI
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{
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private const int kSliderbarTopMargin = 2;
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private const int kSliderbarHeight = 24;
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private const int kSliderbarBottomMargin = 2;
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private const int kPartitionHandleWidth = 2;
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private const int kPartitionHandleExtraHitAreaWidth = 2;
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private static readonly Color[] kCascadeColors =
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{
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new Color(0.5f, 0.5f, 0.6f, 1.0f),
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new Color(0.5f, 0.6f, 0.5f, 1.0f),
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new Color(0.6f, 0.6f, 0.5f, 1.0f),
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new Color(0.6f, 0.5f, 0.5f, 1.0f),
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};
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// using a LODGroup skin
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private static readonly GUIStyle s_CascadeSliderBG = "LODSliderRange";
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private static readonly GUIStyle s_TextCenteredStyle = new GUIStyle(EditorStyles.whiteMiniLabel)
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{
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alignment = TextAnchor.MiddleCenter
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};
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// Internal struct to bundle drag information
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private class DragCache
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{
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public int m_ActivePartition; // the cascade partition that we are currently dragging/resizing
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public float m_NormalizedPartitionSize; // the normalized size of the partition (0.0f < size < 1.0f)
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public Vector2 m_LastCachedMousePosition; // mouse position the last time we registered a drag or mouse down.
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public DragCache(int activePartition, float normalizedPartitionSize, Vector2 currentMousePos)
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{
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m_ActivePartition = activePartition;
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m_NormalizedPartitionSize = normalizedPartitionSize;
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m_LastCachedMousePosition = currentMousePos;
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}
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};
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private static DragCache s_DragCache;
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private static readonly int s_CascadeSliderId = "s_CascadeSliderId".GetHashCode();
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private static SceneView s_RestoreSceneView;
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private static SceneView.CameraMode s_OldSceneDrawMode;
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private static bool s_OldSceneLightingMode;
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/**
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* Static function to handle the GUI and User input related to the cascade slider.
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*
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* @param normalizedCascadePartition The array of partition sizes in the range 0.0f - 1.0f; expects ONE entry if cascades = 2, and THREE if cascades=4
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* The last entry will be automatically determined by summing up the array, and doing 1.0f - sum
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*/
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public static void HandleCascadeSliderGUI(ref float[] normalizedCascadePartitions)
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{
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EditorGUILayout.BeginHorizontal();
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GUILayout.Space(EditorGUI.indentLevel * 15f);
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// get the inspector width since we need it while drawing the partition rects.
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// Only way currently is to reserve the block in the layout using GetRect(), and then immediately drawing the empty box
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// to match the call to GetRect.
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// From this point on, we move to non-layout based code.
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var sliderRect = GUILayoutUtility.GetRect(GUIContent.none
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, s_CascadeSliderBG
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, GUILayout.Height(kSliderbarTopMargin + kSliderbarHeight + kSliderbarBottomMargin)
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, GUILayout.ExpandWidth(true));
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GUI.Box(sliderRect, GUIContent.none);
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EditorGUILayout.EndHorizontal();
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float currentX = sliderRect.x;
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float cascadeBoxStartY = sliderRect.y + kSliderbarTopMargin;
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float cascadeSliderWidth = sliderRect.width - (normalizedCascadePartitions.Length * kPartitionHandleWidth);
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Color origTextColor = GUI.color;
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Color origBackgroundColor = GUI.backgroundColor;
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int colorIndex = -1;
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// setup the array locally with the last partition
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float[] adjustedCascadePartitions = new float[normalizedCascadePartitions.Length + 1];
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System.Array.Copy(normalizedCascadePartitions, adjustedCascadePartitions, normalizedCascadePartitions.Length);
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adjustedCascadePartitions[adjustedCascadePartitions.Length - 1] = 1.0f - normalizedCascadePartitions.Sum();
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// check for user input on any of the partition handles
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// this mechanism gets the current event in the queue... make sure that the mouse is over our control before consuming the event
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int sliderControlId = GUIUtility.GetControlID(s_CascadeSliderId, FocusType.Passive);
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Event currentEvent = Event.current;
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int hotPartitionHandleIndex = -1; // the index of any partition handle that we are hovering over or dragging
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// draw each cascade partition
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for (int i = 0; i < adjustedCascadePartitions.Length; ++i)
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{
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float currentPartition = adjustedCascadePartitions[i];
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colorIndex = (colorIndex + 1) % kCascadeColors.Length;
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GUI.backgroundColor = kCascadeColors[colorIndex];
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float boxLength = (cascadeSliderWidth * currentPartition);
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// main cascade box
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Rect partitionRect = new Rect(currentX, cascadeBoxStartY, boxLength, kSliderbarHeight);
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GUI.Box(partitionRect, GUIContent.none, s_CascadeSliderBG);
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currentX += boxLength;
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// cascade box percentage text
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GUI.color = Color.white;
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Rect textRect = partitionRect;
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var cascadeText = string.Format("{0}\n{1:F1}%", i, currentPartition * 100.0f);
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GUI.Label(textRect, cascadeText, s_TextCenteredStyle);
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// no need to draw the partition handle for last box
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if (i == adjustedCascadePartitions.Length - 1)
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break;
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// partition handle
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GUI.backgroundColor = Color.black;
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Rect handleRect = partitionRect;
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handleRect.x = currentX;
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handleRect.width = kPartitionHandleWidth;
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GUI.Box(handleRect, GUIContent.none, s_CascadeSliderBG);
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// we want a thin handle visually (since wide black bar looks bad), but a slightly larger
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// hit area for easier manipulation
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Rect handleHitRect = handleRect;
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handleHitRect.xMin -= kPartitionHandleExtraHitAreaWidth;
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handleHitRect.xMax += kPartitionHandleExtraHitAreaWidth;
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if (handleHitRect.Contains(currentEvent.mousePosition))
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hotPartitionHandleIndex = i;
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// add regions to slider where the cursor changes to Resize-Horizontal
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if (s_DragCache == null)
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{
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EditorGUIUtility.AddCursorRect(handleHitRect, MouseCursor.ResizeHorizontal, sliderControlId);
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}
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currentX += kPartitionHandleWidth;
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}
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GUI.color = origTextColor;
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GUI.backgroundColor = origBackgroundColor;
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EventType eventType = currentEvent.GetTypeForControl(sliderControlId);
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switch (eventType)
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{
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case EventType.MouseDown:
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if (hotPartitionHandleIndex >= 0)
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{
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s_DragCache = new DragCache(hotPartitionHandleIndex, normalizedCascadePartitions[hotPartitionHandleIndex], currentEvent.mousePosition);
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if (GUIUtility.hotControl == 0)
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GUIUtility.hotControl = sliderControlId;
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currentEvent.Use();
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// Switch active scene view into shadow cascades visualization mode, once we start
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// tweaking cascade splits.
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if (s_RestoreSceneView == null)
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{
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s_RestoreSceneView = SceneView.lastActiveSceneView;
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if (s_RestoreSceneView != null)
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{
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s_OldSceneDrawMode = s_RestoreSceneView.cameraMode;
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#if UNITY_2019_1_OR_NEWER
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s_OldSceneLightingMode = s_RestoreSceneView.sceneLighting;
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#else
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s_OldSceneLightingMode = s_RestoreSceneView.m_SceneLighting;
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#endif
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s_RestoreSceneView.cameraMode = SceneView.GetBuiltinCameraMode(DrawCameraMode.ShadowCascades);
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}
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}
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}
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break;
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case EventType.MouseUp:
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// mouseUp event anywhere should release the hotcontrol (if it belongs to us), drags (if any)
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if (GUIUtility.hotControl == sliderControlId)
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{
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GUIUtility.hotControl = 0;
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currentEvent.Use();
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}
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s_DragCache = null;
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// Restore previous scene view drawing mode once we stop tweaking cascade splits.
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if (s_RestoreSceneView != null)
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{
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s_RestoreSceneView.cameraMode = s_OldSceneDrawMode;
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#if UNITY_2019_1_OR_NEWER
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s_RestoreSceneView.sceneLighting = s_OldSceneLightingMode;
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#else
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s_RestoreSceneView.m_SceneLighting = s_OldSceneLightingMode;
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#endif
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s_RestoreSceneView = null;
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}
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break;
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case EventType.MouseDrag:
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if (GUIUtility.hotControl != sliderControlId)
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break;
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// convert the mouse movement to normalized cascade width. Make sure that we are safe to apply the delta before using it.
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float delta = (currentEvent.mousePosition - s_DragCache.m_LastCachedMousePosition).x / cascadeSliderWidth;
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bool isLeftPartitionHappy = ((adjustedCascadePartitions[s_DragCache.m_ActivePartition] + delta) > 0.0f);
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bool isRightPartitionHappy = ((adjustedCascadePartitions[s_DragCache.m_ActivePartition + 1] - delta) > 0.0f);
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if (isLeftPartitionHappy && isRightPartitionHappy)
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{
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s_DragCache.m_NormalizedPartitionSize += delta;
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normalizedCascadePartitions[s_DragCache.m_ActivePartition] = s_DragCache.m_NormalizedPartitionSize;
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if (s_DragCache.m_ActivePartition < normalizedCascadePartitions.Length - 1)
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normalizedCascadePartitions[s_DragCache.m_ActivePartition + 1] -= delta;
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GUI.changed = true;
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}
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s_DragCache.m_LastCachedMousePosition = currentEvent.mousePosition;
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currentEvent.Use();
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break;
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}
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}
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}
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}
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