Unity3d Ngui dynamic generation of fuzzy background images

First the effect.

Production principle: The fuzzy part is with Uitexture, front is a uisprite. Render a texture with the main camera, blur the texture, and assign the texture to uitexture.

Script code

Using unityengine;using System.Collections; [Requirecomponent (typeof (Uitexture))]public class Blurtexturemaker:monobehaviour {public int iterations = 3;public float Blurspread = 0.6f;public Shader blurshader = null;static Material m_material = null;public Camera camera;private UIT Exture mtexture;private rendertexture mrt;protected Material material{get{if (m_material = null) {m_material = new Materi Al (blurshader); m_material.hideflags = Hideflags.dontsave;} return m_material;}} protected void Awake () {mtexture = Getcomponent<uitexture> ();} protected void Start () {//Disable if we don ' t support image effectsif (! systeminfo.supportsimageeffects) {enabled = False;return;} Disable if the shader can ' t run on the Users Graphics Cardif (!blurshader | |!material.shader.issupported) {enabled = FA Lse;return;} int rtwidth = (int) (NGUITOOLS.SCREENSIZE.X/4); int rtheight = (int) (NGUITOOLS.SCREENSIZE.Y/4); MRT = Rendertexture.gette Mporary (rtwidth, rtheight, 0, rendertextureformat.default); mtexture. maintexture = Generate ();} protected void OnDestroy () {if (null! = MRT) {rendertexture.releasetemporary (MRT);}} Performs one blur iteration.public void Fourtapcone (rendertexture source, rendertexture dest, int iteration) {float off = 0.5f + Iteration * blurspread; Graphics.blitmultitap (source, dest, Material,new Vector2 (-off,-off), New Vector2 (-off, off), new Vector2 (off, off), new Vector2 (off,-off));} Downsamples the texture to a quarter resolution.private void downsample4x (rendertexture source, Rendertexture dest) {Flo at off = 1.0f; Graphics.blitmultitap (source, dest, Material,new Vector2 (-off,-off), New Vector2 (-off, off), new Vector2 (off, off), new Vector2 (off,-off));}  Called by the camera to apply the image effectvoid RenderImage (rendertexture source, rendertexture destination) {int RtW = Source.width/4;int RtH = SOURCE.HEIGHT/4; Rendertexture buffer = rendertexture.gettemporary (RtW, RtH, 0);//Copy source to the 4x4 smaller texture. downsample4x (source, buffer);//Blur the small Texturefor (int i = 0; i < iterations; i++) {Rendertexture buffer2 = rendertexture.gettemporary (RtW, RtH, 0); Fourtapcone (buffer, buffer2, i); Rendertexture.releasetemporary (buffer); buffer = Buffer2;} Graphics.blit (buffer, destination); Rendertexture.releasetemporary (buffer);}        Public Rendertexture Generate () {int rtwidth = (int) (NGUITOOLS.SCREENSIZE.X/4); int rtheight = (int) (NGUITOOLS.SCREENSIZE.Y/4); var tex = Rendertexture.gettemporary (rtwidth, rtheight, 0, Rendertextureformat.default); camera.targettexture = Tex;camera. Render (); camera.targettexture = null; RenderImage (Tex, MRT); Rendertexture.releasetemporary (Tex); return MRT;} [ContextMenu ("sample")]public void Sample () {var Tex = getcomponent<uitexture> (); tex.maintexture = Generate ();}}

　　

Shader code

Shader "Hidden/blureffectconetap" {Properties {_maintex ("", any) = "" {}}subshader {Pass {ZTest always cull Off zwrite Off Fog {Mode off}settexture [_maintex] {constantcolor (0,0,0,0.25) combine texture * constant alpha}settexture [_maint Ex] {Constantcolor (0,0,0,0.25) combine texture * constant + previous}settexture [_maintex] {Constantcolor (0,0,0,0.25) CO Mbine Texture * constant + previous}settexture [_maintex] {constantcolor (0,0,0,0.25) combine texture * constant + Previou S}}}cginclude#include "Unitycg.cginc" struct v2f {float4 pos:sv_position;half2 uv:texcoord0;half2 taps[4]: TEXCOORD1; };sampler2d _maintex;half4 _maintex_texelsize;half4 _bluroffsets;v2f vert (appdata_img v) {v2f o; o.pos = Mul (UNITY_MATRI X_MVP, V.vertex); o.uv = V.texcoord-_bluroffsets.xy * _MAINTEX_TEXELSIZE.XY; Hack, see BlurEffect.cs for the reason for this. Let's make a new blur effect soono.taps[0] = O.uv + _maintex_texelsize * _bluroffsets.xy;o.taps[1] = o.uv-_maintex_texel Size * _bluroffsETS.XY;O.TAPS[2] = o.uv + _maintex_texelsize * _bluroffsets.xy * HALF2 (1,-1); o.taps[3] = o.uv-_maintex_texelsize * _Blur Offsets.xy * HALF2 (1,-1); return o;} Half4 Frag (v2f i): sv_target {Half4 color = tex2d (_maintex, i.taps[0]); color + = tex2d (_maintex, i.taps[1]); color + = tex2d (_maintex, i.taps[2]); color + tex2d (_maintex, i.taps[3]); return color * 0.25;} Endcgsubshader {Pass {ZTest always cull off zwrite off Fog {Mode Off} cgprogram #pragma fragmentoption arb_p Recision_hint_fastest #pragma vertex vert #pragma fragment Frag ENDCG}}fallback off}

　　

Unity3d Ngui dynamic generation of fuzzy background images