using UnityEditorInternal;
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using UnityEngine;
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using UnityEngine.PostProcessing;
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namespace UnityEditor.PostProcessing
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{
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using HistogramMode = PostProcessingProfile.MonitorSettings.HistogramMode;
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public class HistogramMonitor : PostProcessingMonitor
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{
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static GUIContent s_MonitorTitle = new GUIContent("Histogram");
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ComputeShader m_ComputeShader;
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ComputeBuffer m_Buffer;
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Material m_Material;
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RenderTexture m_HistogramTexture;
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Rect m_MonitorAreaRect;
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public HistogramMonitor()
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{
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m_ComputeShader = EditorResources.Load<ComputeShader>("Monitors/HistogramCompute.compute");
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}
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public override void Dispose()
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{
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GraphicsUtils.Destroy(m_Material);
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GraphicsUtils.Destroy(m_HistogramTexture);
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if (m_Buffer != null)
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m_Buffer.Release();
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m_Material = null;
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m_HistogramTexture = null;
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m_Buffer = null;
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}
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public override bool IsSupported()
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{
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return m_ComputeShader != null && GraphicsUtils.supportsDX11;
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}
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public override GUIContent GetMonitorTitle()
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{
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return s_MonitorTitle;
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}
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public override void OnMonitorSettings()
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{
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EditorGUI.BeginChangeCheck();
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bool refreshOnPlay = m_MonitorSettings.refreshOnPlay;
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var mode = m_MonitorSettings.histogramMode;
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refreshOnPlay = GUILayout.Toggle(refreshOnPlay, new GUIContent(FxStyles.playIcon, "Keep refreshing the histogram in play mode; this may impact performances."), FxStyles.preButton);
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mode = (HistogramMode)EditorGUILayout.EnumPopup(mode, FxStyles.preDropdown, GUILayout.MaxWidth(100f));
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if (EditorGUI.EndChangeCheck())
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{
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Undo.RecordObject(m_BaseEditor.serializedObject.targetObject, "Histogram Settings Changed");
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m_MonitorSettings.refreshOnPlay = refreshOnPlay;
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m_MonitorSettings.histogramMode = mode;
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InternalEditorUtility.RepaintAllViews();
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}
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}
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public override void OnMonitorGUI(Rect r)
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{
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if (Event.current.type == EventType.Repaint)
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{
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// If m_MonitorAreaRect isn't set the preview was just opened so refresh the render to get the histogram data
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if (Mathf.Approximately(m_MonitorAreaRect.width, 0) && Mathf.Approximately(m_MonitorAreaRect.height, 0))
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InternalEditorUtility.RepaintAllViews();
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// Sizing
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float width = m_HistogramTexture != null
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? Mathf.Min(m_HistogramTexture.width, r.width - 65f)
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: r.width;
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float height = m_HistogramTexture != null
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? Mathf.Min(m_HistogramTexture.height, r.height - 45f)
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: r.height;
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m_MonitorAreaRect = new Rect(
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Mathf.Floor(r.x + r.width / 2f - width / 2f),
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Mathf.Floor(r.y + r.height / 2f - height / 2f - 5f),
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width, height
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);
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if (m_HistogramTexture != null)
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{
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Graphics.DrawTexture(m_MonitorAreaRect, m_HistogramTexture);
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var color = Color.white;
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const float kTickSize = 5f;
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// Rect, lines & ticks points
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if (m_MonitorSettings.histogramMode == HistogramMode.RGBSplit)
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{
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// A B C D E
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// N F
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// M G
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// L K J I H
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var A = new Vector3(m_MonitorAreaRect.x - 1f, m_MonitorAreaRect.y - 1f);
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var E = new Vector3(A.x + m_MonitorAreaRect.width + 2f, m_MonitorAreaRect.y - 1f);
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var H = new Vector3(E.x, E.y + m_MonitorAreaRect.height + 2f);
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var L = new Vector3(A.x, H.y);
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var N = new Vector3(A.x, A.y + (L.y - A.y) / 3f);
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var M = new Vector3(A.x, A.y + (L.y - A.y) * 2f / 3f);
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var F = new Vector3(E.x, E.y + (H.y - E.y) / 3f);
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var G = new Vector3(E.x, E.y + (H.y - E.y) * 2f / 3f);
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var C = new Vector3(A.x + (E.x - A.x) / 2f, A.y);
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var J = new Vector3(L.x + (H.x - L.x) / 2f, L.y);
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var B = new Vector3(A.x + (C.x - A.x) / 2f, A.y);
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var D = new Vector3(C.x + (E.x - C.x) / 2f, C.y);
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var I = new Vector3(J.x + (H.x - J.x) / 2f, J.y);
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var K = new Vector3(L.x + (J.x - L.x) / 2f, L.y);
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// Borders
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Handles.color = color;
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Handles.DrawLine(A, E);
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Handles.DrawLine(E, H);
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Handles.DrawLine(H, L);
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Handles.DrawLine(L, new Vector3(A.x, A.y - 1f));
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// Vertical ticks
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Handles.DrawLine(A, new Vector3(A.x - kTickSize, A.y));
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Handles.DrawLine(N, new Vector3(N.x - kTickSize, N.y));
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Handles.DrawLine(M, new Vector3(M.x - kTickSize, M.y));
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Handles.DrawLine(L, new Vector3(L.x - kTickSize, L.y));
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Handles.DrawLine(E, new Vector3(E.x + kTickSize, E.y));
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Handles.DrawLine(F, new Vector3(F.x + kTickSize, F.y));
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Handles.DrawLine(G, new Vector3(G.x + kTickSize, G.y));
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Handles.DrawLine(H, new Vector3(H.x + kTickSize, H.y));
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// Horizontal ticks
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Handles.DrawLine(A, new Vector3(A.x, A.y - kTickSize));
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Handles.DrawLine(B, new Vector3(B.x, B.y - kTickSize));
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Handles.DrawLine(C, new Vector3(C.x, C.y - kTickSize));
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Handles.DrawLine(D, new Vector3(D.x, D.y - kTickSize));
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Handles.DrawLine(E, new Vector3(E.x, E.y - kTickSize));
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Handles.DrawLine(L, new Vector3(L.x, L.y + kTickSize));
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Handles.DrawLine(K, new Vector3(K.x, K.y + kTickSize));
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Handles.DrawLine(J, new Vector3(J.x, J.y + kTickSize));
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Handles.DrawLine(I, new Vector3(I.x, I.y + kTickSize));
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Handles.DrawLine(H, new Vector3(H.x, H.y + kTickSize));
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// Separators
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Handles.DrawLine(N, F);
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Handles.DrawLine(M, G);
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// Labels
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GUI.color = color;
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GUI.Label(new Rect(L.x - 15f, L.y + kTickSize - 4f, 30f, 30f), "0.0", FxStyles.tickStyleCenter);
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GUI.Label(new Rect(J.x - 15f, J.y + kTickSize - 4f, 30f, 30f), "0.5", FxStyles.tickStyleCenter);
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GUI.Label(new Rect(H.x - 15f, H.y + kTickSize - 4f, 30f, 30f), "1.0", FxStyles.tickStyleCenter);
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}
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else
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{
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// A B C D E
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// P F
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// O G
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// N H
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// M L K J I
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var A = new Vector3(m_MonitorAreaRect.x, m_MonitorAreaRect.y);
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var E = new Vector3(A.x + m_MonitorAreaRect.width + 1f, m_MonitorAreaRect.y);
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var I = new Vector3(E.x, E.y + m_MonitorAreaRect.height + 1f);
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var M = new Vector3(A.x, I.y);
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var C = new Vector3(A.x + (E.x - A.x) / 2f, A.y);
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var G = new Vector3(E.x, E.y + (I.y - E.y) / 2f);
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var K = new Vector3(M.x + (I.x - M.x) / 2f, M.y);
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var O = new Vector3(A.x, A.y + (M.y - A.y) / 2f);
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var P = new Vector3(A.x, A.y + (O.y - A.y) / 2f);
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var F = new Vector3(E.x, E.y + (G.y - E.y) / 2f);
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var N = new Vector3(A.x, O.y + (M.y - O.y) / 2f);
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var H = new Vector3(E.x, G.y + (I.y - G.y) / 2f);
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var B = new Vector3(A.x + (C.x - A.x) / 2f, A.y);
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var L = new Vector3(M.x + (K.x - M.x) / 2f, M.y);
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var D = new Vector3(C.x + (E.x - C.x) / 2f, A.y);
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var J = new Vector3(K.x + (I.x - K.x) / 2f, M.y);
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// Borders
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Handles.color = color;
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Handles.DrawLine(A, E);
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Handles.DrawLine(E, I);
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Handles.DrawLine(I, M);
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Handles.DrawLine(M, new Vector3(A.x, A.y - 1f));
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// Vertical ticks
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Handles.DrawLine(A, new Vector3(A.x - kTickSize, A.y));
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Handles.DrawLine(P, new Vector3(P.x - kTickSize, P.y));
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Handles.DrawLine(O, new Vector3(O.x - kTickSize, O.y));
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Handles.DrawLine(N, new Vector3(N.x - kTickSize, N.y));
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Handles.DrawLine(M, new Vector3(M.x - kTickSize, M.y));
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Handles.DrawLine(E, new Vector3(E.x + kTickSize, E.y));
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Handles.DrawLine(F, new Vector3(F.x + kTickSize, F.y));
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Handles.DrawLine(G, new Vector3(G.x + kTickSize, G.y));
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Handles.DrawLine(H, new Vector3(H.x + kTickSize, H.y));
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Handles.DrawLine(I, new Vector3(I.x + kTickSize, I.y));
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// Horizontal ticks
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Handles.DrawLine(A, new Vector3(A.x, A.y - kTickSize));
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Handles.DrawLine(B, new Vector3(B.x, B.y - kTickSize));
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Handles.DrawLine(C, new Vector3(C.x, C.y - kTickSize));
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Handles.DrawLine(D, new Vector3(D.x, D.y - kTickSize));
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Handles.DrawLine(E, new Vector3(E.x, E.y - kTickSize));
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Handles.DrawLine(M, new Vector3(M.x, M.y + kTickSize));
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Handles.DrawLine(L, new Vector3(L.x, L.y + kTickSize));
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Handles.DrawLine(K, new Vector3(K.x, K.y + kTickSize));
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Handles.DrawLine(J, new Vector3(J.x, J.y + kTickSize));
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Handles.DrawLine(I, new Vector3(I.x, I.y + kTickSize));
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// Labels
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GUI.color = color;
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GUI.Label(new Rect(A.x - kTickSize - 34f, A.y - 15f, 30f, 30f), "1.0", FxStyles.tickStyleRight);
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GUI.Label(new Rect(O.x - kTickSize - 34f, O.y - 15f, 30f, 30f), "0.5", FxStyles.tickStyleRight);
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GUI.Label(new Rect(M.x - kTickSize - 34f, M.y - 15f, 30f, 30f), "0.0", FxStyles.tickStyleRight);
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GUI.Label(new Rect(E.x + kTickSize + 4f, E.y - 15f, 30f, 30f), "1.0", FxStyles.tickStyleLeft);
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GUI.Label(new Rect(G.x + kTickSize + 4f, G.y - 15f, 30f, 30f), "0.5", FxStyles.tickStyleLeft);
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GUI.Label(new Rect(I.x + kTickSize + 4f, I.y - 15f, 30f, 30f), "0.0", FxStyles.tickStyleLeft);
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GUI.Label(new Rect(M.x - 15f, M.y + kTickSize - 4f, 30f, 30f), "0.0", FxStyles.tickStyleCenter);
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GUI.Label(new Rect(K.x - 15f, K.y + kTickSize - 4f, 30f, 30f), "0.5", FxStyles.tickStyleCenter);
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GUI.Label(new Rect(I.x - 15f, I.y + kTickSize - 4f, 30f, 30f), "1.0", FxStyles.tickStyleCenter);
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}
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}
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}
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}
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public override void OnFrameData(RenderTexture source)
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{
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if (Application.isPlaying && !m_MonitorSettings.refreshOnPlay)
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return;
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if (Mathf.Approximately(m_MonitorAreaRect.width, 0) || Mathf.Approximately(m_MonitorAreaRect.height, 0))
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return;
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float ratio = (float)source.width / (float)source.height;
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int h = 512;
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int w = Mathf.FloorToInt(h * ratio);
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var rt = RenderTexture.GetTemporary(w, h, 0, source.format);
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Graphics.Blit(source, rt);
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ComputeHistogram(rt);
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m_BaseEditor.Repaint();
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RenderTexture.ReleaseTemporary(rt);
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}
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void CreateBuffer(int width, int height)
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{
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m_Buffer = new ComputeBuffer(width * height, sizeof(uint) << 2);
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}
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void ComputeHistogram(RenderTexture source)
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{
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if (m_Buffer == null)
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{
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CreateBuffer(256, 1);
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}
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else if (m_Buffer.count != 256)
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{
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m_Buffer.Release();
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CreateBuffer(256, 1);
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}
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if (m_Material == null)
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{
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m_Material = new Material(Shader.Find("Hidden/Post FX/Monitors/Histogram Render")) { hideFlags = HideFlags.DontSave };
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}
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var channels = Vector4.zero;
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switch (m_MonitorSettings.histogramMode)
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{
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case HistogramMode.Red: channels.x = 1f; break;
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case HistogramMode.Green: channels.y = 1f; break;
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case HistogramMode.Blue: channels.z = 1f; break;
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case HistogramMode.Luminance: channels.w = 1f; break;
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default: channels = new Vector4(1f, 1f, 1f, 0f); break;
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}
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var cs = m_ComputeShader;
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int kernel = cs.FindKernel("KHistogramClear");
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cs.SetBuffer(kernel, "_Histogram", m_Buffer);
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cs.Dispatch(kernel, 1, 1, 1);
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kernel = cs.FindKernel("KHistogramGather");
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cs.SetBuffer(kernel, "_Histogram", m_Buffer);
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cs.SetTexture(kernel, "_Source", source);
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cs.SetInt("_IsLinear", GraphicsUtils.isLinearColorSpace ? 1 : 0);
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cs.SetVector("_Res", new Vector4(source.width, source.height, 0f, 0f));
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cs.SetVector("_Channels", channels);
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cs.Dispatch(kernel, Mathf.CeilToInt(source.width / 16f), Mathf.CeilToInt(source.height / 16f), 1);
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kernel = cs.FindKernel("KHistogramScale");
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cs.SetBuffer(kernel, "_Histogram", m_Buffer);
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cs.Dispatch(kernel, 1, 1, 1);
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if (m_HistogramTexture == null || m_HistogramTexture.width != source.width || m_HistogramTexture.height != source.height)
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{
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GraphicsUtils.Destroy(m_HistogramTexture);
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m_HistogramTexture = new RenderTexture(source.width, source.height, 0, RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear)
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{
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hideFlags = HideFlags.DontSave,
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wrapMode = TextureWrapMode.Clamp,
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filterMode = FilterMode.Bilinear
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};
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}
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m_Material.SetBuffer("_Histogram", m_Buffer);
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m_Material.SetVector("_Size", new Vector2(m_HistogramTexture.width, m_HistogramTexture.height));
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m_Material.SetColor("_ColorR", new Color(1f, 0f, 0f, 1f));
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m_Material.SetColor("_ColorG", new Color(0f, 1f, 0f, 1f));
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m_Material.SetColor("_ColorB", new Color(0f, 0f, 1f, 1f));
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m_Material.SetColor("_ColorL", new Color(1f, 1f, 1f, 1f));
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m_Material.SetInt("_Channel", (int)m_MonitorSettings.histogramMode);
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int pass = 0;
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if (m_MonitorSettings.histogramMode == HistogramMode.RGBMerged)
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pass = 1;
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else if (m_MonitorSettings.histogramMode == HistogramMode.RGBSplit)
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pass = 2;
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Graphics.Blit(null, m_HistogramTexture, m_Material, pass);
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}
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}
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}
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