[unity] Added example component SkeletonRenderTexture to render to a render texture. Added fadeout example scene named 'RenderTexture FadeOut Transparency'. Closes #1337.

CHANGELOG.md

@@ -163,6 +163,7 @@
   * Improved `Advanced - Fix Prefab Override MeshFilter` property for `SkeletonRenderer` (and subclasses`SkeletonAnimation` and `SkeletonMecanim`), now providing an additional option to use a global value which can be set in `Edit - Preferences - Spine`.
   * Timeline naming improvements: `Spine AnimationState Clip` Inspector parameter `Custom Duration` changed and inverted to `Default Mix Duration` for more clarity. Shortened all Timeline add track menu entries from: `Spine.Unity.Playables - <track type>` to `Spine - <track type>`, `Spine Animation State Track` to `SkeletonAnimation Track`, `Spine AnimationState Graphic Track` to `SkeletonGraphic Track`, and `Spine Skeleton Flip Track` to `Skeleton Flip Track`.
   * Timeline track appearance and Inspector: Tracks now show icons and track colors to make them easier to distinguish. When a Track is selected, the Inspector now shows an editable track name which was previously only editable at the Timeline asset.
+  * Added example component `SkeletonRenderTexture` to render a `SkeletonRenderer` to a `RenderTexture`, mainly for proper transparency. Added an example scene named `RenderTexture FadeOut Transparency` that demonstrates usage for a fadeout transparency effect.
 
 * **Changes of default values**
 

spine-unity/Assets/Spine Examples/Other Examples/RenderTexture FadeOut Transparency.unity

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+
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spine-unity/Assets/Spine Examples/Other Examples/RenderTexture FadeOut Transparency.unity.meta

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spine-unity/Assets/Spine Examples/Scripts/RenderTextureFadeoutExample.cs

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+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2022, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using UnityEngine;
+using UnityEngine.Events;
+
+namespace Spine.Unity.Examples {
+	public class RenderTextureFadeoutExample : MonoBehaviour {
+
+		public SkeletonRenderTexture skeletonRenderTexture;
+		public SkeletonRenderer normalSkeletonRenderer;
+
+		public void Update () {
+			float fadeoutAlpha = 1.0f - ((0.5f * Time.time) % 1.0f);
+
+			// changing transpacency at a MeshRenderer does not yield the desired effect
+			// due to overlapping attachment meshes.
+			normalSkeletonRenderer.Skeleton.SetColor(new Color(1, 1, 1, fadeoutAlpha));
+
+			// Thus we render the whole skeleton to a RenderTexture first using the 
+			// SkeletonRenderTexture component.
+			// Changing transparency at a single quad with a RenderTexture works as desired.
+			skeletonRenderTexture.color.a = fadeoutAlpha;
+		}
+	}
+}

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+    - _ZWrite: 0
+    m_Colors:
+    - _Black: {r: 0, g: 0, b: 0, a: 0}
+    - _Color: {r: 1, g: 1, b: 1, a: 1}
+    - _EmissionColor: {r: 0, g: 0, b: 0, a: 1}
+    - _OutlineColor: {r: 1, g: 1, b: 0, a: 1}
+  m_BuildTextureStacks: []

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spine-unity/Assets/Spine Examples/Scripts/Sample Components/SkeletonRenderTexture/RenderQuadShader.shader

@@ -0,0 +1,104 @@
+// Simple shader for e.g. a Quad that renders a RenderTexture.
+// Texture color is multiplied by a color property, mostly for alpha fadeout.
+Shader "Spine/RenderQuad" {
+	Properties{
+		_Color("Color", Color) = (1,1,1,1)
+		[NoScaleOffset] _MainTex("MainTex", 2D) = "white" {}
+		_Cutoff("Shadow alpha cutoff", Range(0,1)) = 0.1
+		[HideInInspector] _StencilRef("Stencil Reference", Float) = 1.0
+		[HideInInspector][Enum(UnityEngine.Rendering.CompareFunction)] _StencilComp("Stencil Comparison", Float) = 8 // Set to Always as default
+	}
+	SubShader{
+		Tags { "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" "PreviewType" = "Plane" }
+		Blend One OneMinusSrcAlpha
+		Cull Off
+		ZWrite Off
+		Lighting Off
+
+		Stencil {
+			Ref[_StencilRef]
+			Comp[_StencilComp]
+			Pass Keep
+		}
+
+		Pass {
+			Name "Normal"
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			#include "UnityCG.cginc"
+			sampler2D _MainTex;
+			float4 _Color;
+
+			struct VertexInput {
+				float4 vertex : POSITION;
+				float2 uv : TEXCOORD0;
+				float4 vertexColor : COLOR;
+			};
+
+			struct VertexOutput {
+				float4 pos : SV_POSITION;
+				float2 uv : TEXCOORD0;
+				float4 vertexColor : COLOR;
+			};
+
+			VertexOutput vert(VertexInput v) {
+				VertexOutput o = (VertexOutput)0;
+				o.uv = v.uv;
+				o.vertexColor = v.vertexColor;
+				o.pos = UnityObjectToClipPos(v.vertex);
+				return o;
+			}
+
+			float4 frag(VertexOutput i) : SV_Target {
+				float4 texColor = tex2D(_MainTex,i.uv);
+				_Color.rgb *= _Color.a;
+				return texColor * _Color;
+			}
+			ENDCG
+		}
+
+		Pass {
+			Name "Caster"
+			Tags { "LightMode" = "ShadowCaster" }
+			Offset 1, 1
+			ZWrite On
+			ZTest LEqual
+
+			Fog { Mode Off }
+			Cull Off
+			Lighting Off
+
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			#pragma multi_compile_shadowcaster
+			#pragma fragmentoption ARB_precision_hint_fastest
+			#include "UnityCG.cginc"
+			sampler2D _MainTex;
+			fixed _Cutoff;
+
+			struct VertexOutput {
+				V2F_SHADOW_CASTER;
+				float4 uvAndAlpha : TEXCOORD1;
+			};
+
+			VertexOutput vert(appdata_base v, float4 vertexColor : COLOR) {
+				VertexOutput o;
+				o.uvAndAlpha = v.texcoord;
+				o.uvAndAlpha.a = vertexColor.a;
+				TRANSFER_SHADOW_CASTER(o)
+				return o;
+			}
+
+			float4 frag(VertexOutput i) : SV_Target {
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a* i.uvAndAlpha.a - _Cutoff);
+				SHADOW_CASTER_FRAGMENT(i)
+			}
+			ENDCG
+		}
+	}
+	FallBack "Diffuse"
+}

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spine-unity/Assets/Spine Examples/Scripts/Sample Components/SkeletonRenderTexture/SkeletonRenderTexture.cs

@@ -0,0 +1,223 @@
+/******************************************************************************
+ * Spine Runtimes License Agreement
+ * Last updated January 1, 2020. Replaces all prior versions.
+ *
+ * Copyright (c) 2013-2022, Esoteric Software LLC
+ *
+ * Integration of the Spine Runtimes into software or otherwise creating
+ * derivative works of the Spine Runtimes is permitted under the terms and
+ * conditions of Section 2 of the Spine Editor License Agreement:
+ * http://esotericsoftware.com/spine-editor-license
+ *
+ * Otherwise, it is permitted to integrate the Spine Runtimes into software
+ * or otherwise create derivative works of the Spine Runtimes (collectively,
+ * "Products"), provided that each user of the Products must obtain their own
+ * Spine Editor license and redistribution of the Products in any form must
+ * include this license and copyright notice.
+ *
+ * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
+ * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.Rendering;
+
+namespace Spine.Unity.Examples {
+
+	[RequireComponent(typeof(SkeletonRenderer))]
+	public class SkeletonRenderTexture : MonoBehaviour {
+		public Color color = Color.white;
+		public Material quadMaterial;
+		public Camera targetCamera;
+		public int maxRenderTextureSize = 1024;
+		protected SkeletonRenderer skeletonRenderer;
+		protected MeshRenderer meshRenderer;
+		protected MeshFilter meshFilter;
+		public GameObject quad;
+		protected MeshRenderer quadMeshRenderer;
+		protected MeshFilter quadMeshFilter;
+		protected Mesh quadMesh;
+		public RenderTexture renderTexture;
+
+		private CommandBuffer commandBuffer;
+		private MaterialPropertyBlock propertyBlock;
+		private readonly List<Material> materials = new List<Material>();
+
+		protected Vector2Int requiredRenderTextureSize;
+		protected Vector2Int allocatedRenderTextureSize;
+
+		void Awake () {
+			meshRenderer = this.GetComponent<MeshRenderer>();
+			meshFilter = this.GetComponent<MeshFilter>();
+			skeletonRenderer = this.GetComponent<SkeletonRenderer>();
+			if (targetCamera == null)
+				targetCamera = Camera.main;
+
+			commandBuffer = new CommandBuffer();
+			propertyBlock = new MaterialPropertyBlock();
+
+			CreateQuadChild();
+		}
+
+		void OnDestroy () {
+			if (renderTexture)
+				RenderTexture.ReleaseTemporary(renderTexture);
+		}
+
+		void CreateQuadChild () {
+			quad = new GameObject(this.name + " RenderTexture", typeof(MeshRenderer), typeof(MeshFilter));
+			quad.transform.SetParent(this.transform.parent, false);
+			quadMeshRenderer = quad.GetComponent<MeshRenderer>();
+			quadMeshFilter = quad.GetComponent<MeshFilter>();
+
+			quadMesh = new Mesh();
+			quadMesh.MarkDynamic();
+			quadMesh.name = "RenderTexture Quad";
+			quadMesh.hideFlags = HideFlags.DontSaveInBuild | HideFlags.DontSaveInEditor;
+
+			if (quadMaterial != null)
+				quadMeshRenderer.material = new Material(quadMaterial);
+			else
+				quadMeshRenderer.material = new Material(Shader.Find("Spine/RenderQuad"));
+		}
+
+		void OnEnable () {
+			skeletonRenderer.OnMeshAndMaterialsUpdated += RenderOntoQuad;
+			meshRenderer.forceRenderingOff = true;
+			if (quadMeshRenderer)
+				quadMeshRenderer.gameObject.SetActive(true);
+		}
+
+		void OnDisable () {
+			skeletonRenderer.OnMeshAndMaterialsUpdated -= RenderOntoQuad;
+			meshRenderer.forceRenderingOff = false;
+			if (quadMeshRenderer)
+				quadMeshRenderer.gameObject.SetActive(false);
+			if (renderTexture)
+				RenderTexture.ReleaseTemporary(renderTexture);
+			allocatedRenderTextureSize = Vector2Int.zero;
+		}
+
+		void RenderOntoQuad (SkeletonRenderer skeletonRenderer) {
+			PrepareForMesh();
+			RenderToRenderTexture();
+			AssignAtQuad();
+		}
+
+		protected void PrepareForMesh () {
+			Bounds boundsLocalSpace = meshFilter.sharedMesh.bounds;
+			Vector3 meshMinWorldSpace = transform.TransformPoint(boundsLocalSpace.min);
+			Vector3 meshMaxWorldSpace = transform.TransformPoint(boundsLocalSpace.max);
+			Vector3 meshMinXMaxYWorldSpace = new Vector3(meshMinWorldSpace.x, meshMaxWorldSpace.y);
+			Vector3 meshMaxXMinYWorldSpace = new Vector3(meshMaxWorldSpace.x, meshMinWorldSpace.y);
+
+			// We need to get the min/max of all four corners, close position and rotation of the skeleton
+			// in combination with perspective projection otherwise might lead to incorrect screen space min/max.
+			Vector3 meshMinProjected = targetCamera.WorldToScreenPoint(meshMinWorldSpace);
+			Vector3 meshMaxProjected = targetCamera.WorldToScreenPoint(meshMaxWorldSpace);
+			Vector3 meshMinXMaxYProjected = targetCamera.WorldToScreenPoint(meshMinXMaxYWorldSpace);
+			Vector3 meshMaxXMinYProjected = targetCamera.WorldToScreenPoint(meshMaxXMinYWorldSpace);
+			// To handle 180 degree rotation and thus min/max inversion, we get min/max of all four corners
+			Vector3 meshMinScreenSpace =
+				Vector3.Min(meshMinProjected, Vector3.Min(meshMaxProjected,
+				Vector3.Min(meshMinXMaxYProjected, meshMaxXMinYProjected)));
+			Vector3 meshMaxScreenSpace =
+				Vector3.Max(meshMinProjected, Vector3.Max(meshMaxProjected,
+				Vector3.Max(meshMinXMaxYProjected, meshMaxXMinYProjected)));
+
+			requiredRenderTextureSize = new Vector2Int(
+				Mathf.Min(maxRenderTextureSize, Mathf.CeilToInt(Mathf.Abs(meshMaxScreenSpace.x - meshMinScreenSpace.x))),
+				Mathf.Min(maxRenderTextureSize, Mathf.CeilToInt(Mathf.Abs(meshMaxScreenSpace.y - meshMinScreenSpace.y))));
+
+			PrepareRenderTexture();
+			PrepareCommandBuffer(meshMinWorldSpace, meshMaxWorldSpace);
+		}
+
+		protected void PrepareCommandBuffer (Vector3 meshMinWorldSpace, Vector3 meshMaxWorldSpace) {
+			commandBuffer.Clear();
+			commandBuffer.SetRenderTarget(renderTexture);
+			commandBuffer.ClearRenderTarget(true, true, Color.clear);
+
+			Matrix4x4 projectionMatrix = Matrix4x4.Ortho(
+				meshMinWorldSpace.x, meshMaxWorldSpace.x,
+				meshMinWorldSpace.y, meshMaxWorldSpace.y,
+				float.MinValue, float.MaxValue);
+
+			commandBuffer.SetProjectionMatrix(projectionMatrix);
+			commandBuffer.SetViewport(new Rect(Vector2.zero, requiredRenderTextureSize));
+		}
+
+		protected void RenderToRenderTexture () {
+			meshRenderer.GetPropertyBlock(propertyBlock);
+			meshRenderer.GetSharedMaterials(materials);
+
+			for (int i = 0; i < materials.Count; i++)
+				commandBuffer.DrawMesh(meshFilter.sharedMesh, transform.localToWorldMatrix,
+					materials[i], meshRenderer.subMeshStartIndex + i, -1, propertyBlock);
+			Graphics.ExecuteCommandBuffer(commandBuffer);
+		}
+
+		protected void AssignAtQuad () {
+			Vector2 min = meshFilter.sharedMesh.bounds.min;
+			Vector2 max = meshFilter.sharedMesh.bounds.max;
+
+			Vector3[] vertices = new Vector3[4] {
+				new Vector3(min.x, min.y, 0),
+				new Vector3(max.x, min.y, 0),
+				new Vector3(min.x, max.y, 0),
+				new Vector3(max.x, max.y, 0)
+			};
+			quadMesh.vertices = vertices;
+
+			int[] indices = new int[6] { 0, 2, 1, 2, 3, 1 };
+			quadMesh.triangles = indices;
+
+			Vector3[] normals = new Vector3[4] {
+				-Vector3.forward,
+				-Vector3.forward,
+				-Vector3.forward,
+				-Vector3.forward
+			};
+			quadMesh.normals = normals;
+
+			float maxU = (float)(requiredRenderTextureSize.x) / allocatedRenderTextureSize.x;
+			float maxV = (float)(requiredRenderTextureSize.y) / allocatedRenderTextureSize.y;
+			Vector2[] uv = new Vector2[4] {
+				new Vector2(0, 0),
+				new Vector2(maxU, 0),
+				new Vector2(0, maxV),
+				new Vector2(maxU, maxV)
+			};
+			quadMesh.uv = uv;
+			quadMeshFilter.mesh = quadMesh;
+			quadMeshRenderer.sharedMaterial.mainTexture = this.renderTexture;
+			quadMeshRenderer.sharedMaterial.color = color;
+
+			quadMeshRenderer.transform.position = this.transform.position;
+			quadMeshRenderer.transform.rotation = this.transform.rotation;
+			quadMeshRenderer.transform.localScale = this.transform.localScale;
+		}
+
+		protected void PrepareRenderTexture () {
+			Vector2Int textureSize = new Vector2Int(
+				Mathf.NextPowerOfTwo(requiredRenderTextureSize.x),
+				Mathf.NextPowerOfTwo(requiredRenderTextureSize.y));
+
+			if (textureSize != allocatedRenderTextureSize) {
+				if (renderTexture)
+					RenderTexture.ReleaseTemporary(renderTexture);
+				renderTexture = RenderTexture.GetTemporary(textureSize.x, textureSize.y);
+				allocatedRenderTextureSize = textureSize;
+			}
+		}
+	}
+}

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