学步园

#pragma strict<br /> @script ExecuteInEditMode<br /> @script AddComponentMenu("Image Effects/Depth Of Field")<br /> @script RequireComponent(Camera)<br /> var focalDistance = 5.0;<br /> var focalRange = 10.0;<br /> /// Blur iterations - larger number means more blur.<br /> var iterations = 1;<br /> var iterations2 = 2;<br /> /// Blur spread for each iteration. Lower values<br /> /// give better looking blur, but require more iterations to<br /> /// get large blurs. Value is usually between 0.5 and 1.0.<br /> var blurSpread = 0.6;</p> <p>var renderSceneShader : Shader;<br /> var compositeShader : Shader;</p> <p>// --------------------------------------------------------<br /> // The blur iteration shader.<br /> // Basically it just takes 4 texture samples and averages them.<br /> // By applying it repeatedly and spreading out sample locations<br /> // we get a Gaussian blur approximation.<br /> private static var blurMatString =<br /> "Shader /"BlurConeTap/" { SubShader { Pass { " +<br /> "ZTest Always Cull Off ZWrite Off Fog { Mode Off } " +<br /> " SetTexture [__RenderTex] {constantColor (0,0,0,0.25) combine texture * constant alpha} " +<br /> " SetTexture [__RenderTex] {constantColor (0,0,0,0.25) combine texture * constant + previous} " +<br /> " SetTexture [__RenderTex] {constantColor (0,0,0,0.25) combine texture * constant + previous} " +<br /> " SetTexture [__RenderTex] {constantColor (0,0,0,0.25) combine texture * constant + previous} " +<br /> "} } Fallback off }";</p> <p>private var m_Material : Material;<br /> private function GetMaterial() : Material {<br /> if (m_Material == null) {<br /> m_Material = new Material( blurMatString );<br /> m_Material.hideFlags = HideFlags.HideAndDontSave;<br /> m_Material.shader.hideFlags = HideFlags.HideAndDontSave;<br /> }<br /> return m_Material;<br /> }<br /> private var m_CompositeMaterial : Material;<br /> private function GetCompositeMaterial() : Material {<br /> if (m_CompositeMaterial == null) {<br /> m_CompositeMaterial = new Material( compositeShader );<br /> m_CompositeMaterial.hideFlags = HideFlags.HideAndDontSave;<br /> }<br /> return m_CompositeMaterial;<br /> }<br /> private var renderTexture : RenderTexture;<br /> private var shaderCamera : GameObject;</p> <p>function OnDisable() {<br /> if( m_Material ) {<br /> DestroyImmediate( m_Material.shader );<br /> DestroyImmediate( m_Material );<br /> }<br /> DestroyImmediate (m_CompositeMaterial);<br /> DestroyImmediate (shaderCamera);<br /> if (renderTexture != null) {<br /> RenderTexture.ReleaseTemporary (renderTexture);<br /> renderTexture = null;<br /> }<br /> }<br /> // --------------------------------------------------------<br /> function Start() {<br /> // Disable if we don't support image effects<br /> if (!SystemInfo.supportsImageEffects) {<br /> enabled = false;<br /> return;<br /> }<br /> // Disable if the shader(s) can't run on the users graphics card<br /> if (!GetMaterial().shader.isSupported || !GetCompositeMaterial().shader.isSupported) {<br /> enabled = false;<br /> return;<br /> }<br /> if (!renderSceneShader || !renderSceneShader.isSupported) {<br /> enabled = false;<br /> return;<br /> }<br /> }<br /> // --------------------------------------------------------<br /> function OnPreRender()<br /> {<br /> if (!enabled || !gameObject.active)<br /> return;</p> <p>if (renderTexture != null) {<br /> RenderTexture.ReleaseTemporary (renderTexture);<br /> renderTexture = null;<br /> }<br /> renderTexture = RenderTexture.GetTemporary (camera.pixelWidth, camera.pixelHeight, 16);<br /> if (!shaderCamera) {<br /> shaderCamera = new GameObject("ShaderCamera", Camera);<br /> shaderCamera.camera.enabled = false;<br /> shaderCamera.hideFlags = HideFlags.HideAndDontSave;<br /> }<br /> var cam = shaderCamera.camera;<br /> cam.CopyFrom (camera);<br /> cam.backgroundColor = Color(1,1,1,1);<br /> cam.clearFlags = CameraClearFlags.SolidColor;<br /> cam.targetTexture = renderTexture;<br /> cam.RenderWithShader (renderSceneShader, "RenderType");<br /> }<br /> // --------------------------------------------------------</p> <p>// Performs one blur iteration.<br /> private function FourTapCone (source : RenderTexture, dest : RenderTexture, iteration : int) : void<br /> {<br /> RenderTexture.active = dest;<br /> source.SetGlobalShaderProperty ("__RenderTex");<br /> var offsetX = (0.5+iteration*blurSpread) / source.width;<br /> var offsetY = (0.5+iteration*blurSpread) / source.height;<br /> GL.PushMatrix ();<br /> GL.LoadOrtho ();<br /> var mat = GetMaterial();<br /> for (var i = 0; i < mat.passCount; ++i) {<br /> mat.SetPass (i);<br /> Render4TapQuad( dest, offsetX, offsetY );<br /> }<br /> GL.PopMatrix ();<br /> }<br /> // Downsamples the texture to a quarter resolution.<br /> private function DownSample4x (source : RenderTexture, dest : RenderTexture) : void<br /> {<br /> RenderTexture.active = dest;<br /> source.SetGlobalShaderProperty ("__RenderTex");<br /> var offsetX = 1.0 / source.width;<br /> var offsetY = 1.0 / source.height;<br /> GL.PushMatrix ();<br /> GL.LoadOrtho ();<br /> var mat = GetMaterial();<br /> for (var i = 0; i < mat.passCount; ++i)<br /> {<br /> mat.SetPass (i);<br /> Render4TapQuad( dest, offsetX, offsetY );<br /> }<br /> GL.PopMatrix ();<br /> }<br /> // Called by the camera to apply the image effect<br /> function OnRenderImage (source : RenderTexture, destination : RenderTexture) : void<br /> {<br /> var buffer1 = RenderTexture.GetTemporary(source.width/4, source.height/4, 0);<br /> var buffer2 = RenderTexture.GetTemporary(source.width/4, source.height/4, 0);<br /> var interm = RenderTexture.GetTemporary(source.width/4, source.height/4, 0);<br /> // Copy source to the 4x4 smaller texture.<br /> DownSample4x (source, buffer1);<br /> // Blur the small texture repeatedly<br /> var oddEven = true;<br /> for(var i = 0; i < iterations + iterations2; i++)<br /> {<br /> if( oddEven )<br /> FourTapCone (buffer1, buffer2, i);<br /> else<br /> FourTapCone (buffer2, buffer1, i);<br /> oddEven = !oddEven;</p> <p> if (i==iterations-1)<br /> ImageEffects.Blit(oddEven ? buffer1 : buffer2, interm);<br /> }</p> <p>var compositeMat = GetCompositeMaterial();<br /> compositeMat.SetTexture ("_BlurTex1", interm);<br /> compositeMat.SetTexture ("_BlurTex2", oddEven ? buffer1 : buffer2);<br /> compositeMat.SetTexture ("_DepthTex", renderTexture);<br /> Shader.SetGlobalVector ("_FocalParams", Vector4(focalDistance, 1.0/focalDistance, focalRange, 1.0/focalRange));</p> <p>ImageEffects.BlitWithMaterial(compositeMat, source, destination);<br /> RenderTexture.ReleaseTemporary(buffer1);<br /> RenderTexture.ReleaseTemporary(buffer2);<br /> RenderTexture.ReleaseTemporary(interm);<br /> if (renderTexture != null) {<br /> RenderTexture.ReleaseTemporary (renderTexture);<br /> renderTexture = null;<br /> }<br /> }<br /> private static function Render4TapQuad( dest : RenderTexture, offsetX : float, offsetY : float ) : void<br /> {<br /> GL.Begin( GL.QUADS );<br /> // Direct3D needs interesting texel offsets!<br /> var off = Vector2.zero;<br /> if( dest != null )<br /> off = dest.GetTexelOffset() * 0.75;<br /> Set4TexCoords( off.x, off.y, offsetX, offsetY );<br /> GL.Vertex3( 0,0, 0.1 );<br /> Set4TexCoords( 1.0 + off.x, off.y, offsetX, offsetY );<br /> GL.Vertex3( 1,0, 0.1 );<br /> Set4TexCoords( 1.0 + off.x, 1.0 + off.y, offsetX, offsetY );<br /> GL.Vertex3( 1,1, 0.1 );<br /> Set4TexCoords( off.x, 1.0 + off.y, offsetX, offsetY );<br /> GL.Vertex3( 0,1, 0.1 );<br /> GL.End();<br /> }<br /> private static function Set4TexCoords( x : float, y : float, offsetX : float, offsetY : float ) : void<br /> {<br /> GL.MultiTexCoord2( 0, x - offsetX, y - offsetY );<br /> GL.MultiTexCoord2( 1, x + offsetX, y - offsetY );<br /> GL.MultiTexCoord2( 2, x + offsetX, y + offsetY );<br /> GL.MultiTexCoord2( 3, x - offsetX, y + offsetY );<br /> }