本文实例为大家分享了unity shader百叶窗展示的具体代码，供大家参考，具体内容如下
1.将图片划分为水平n栏，代码如下：
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shader "unlit/bycshader"
{
properties
{
[perrendererdata] _maintex ("sprite texture", 2d) = "white" {}
_color ("tint", color) = (1,1,1,1)
_stencilcomp ("stencil comparison", float) = 8
_stencil ("stencil id", float) = 0
_stencilop ("stencil operation", float) = 0
_stencilwritemask ("stencil write mask", float) = 255
_stencilreadmask ("stencil read mask", float) = 255
_colormask ("color mask", float) = 15
_lan("lan",float) = 10
[toggle(unity_ui_alphaclip)] _useuialphaclip ("use alpha clip", float) = 0
}
subshader
{
tags
{
"queue"="transparent"
"ignoreprojector"="true"
"rendertype"="transparent"
"previewtype"="plane"
"canusespriteatlas"="true"
}
stencil
{
ref [_stencil]
comp [_stencilcomp]
pass [_stencilop]
readmask [_stencilreadmask]
writemask [_stencilwritemask]
}
cull off
lighting off
zwrite off
ztest [unity_guiztestmode]
blend srcalpha oneminussrcalpha
colormask [_colormask]
pass
{
name "default"
cgprogram
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#include "unitycg.cginc"
#include "unityui.cginc"
#pragma multi_compile __ unity_ui_clip_rect
#pragma multi_compile __ unity_ui_alphaclip
struct appdata_t
{
float4 vertex : position;
float4 color : color;
float2 texcoord : texcoord0;
unity_vertex_input_instance_id
};
struct v2f
{
float4 vertex : sv_position;
fixed4 color : color;
float2 texcoord : texcoord0;
float4 worldposition : texcoord1;
unity_vertex_output_stereo
};
v2f vert(appdata_t v)
{
v2f out;
unity_setup_instance_id(v);
unity_initialize_vertex_output_stereo(out);
out.worldposition = v.vertex;
out.vertex = unityobjecttoclippos(out.worldposition);
out.texcoord = v.texcoord;
out.color = v.color;
return out;
}
sampler2d _maintex;
float _lan;
float4 frag(v2f in) : sv_target
{
//從這裡開始
float2 uv = in.texcoord;
uv.x*= _lan;
uv.x = frac(uv.x);
return float4(uv.xy,1.0,1.0);
}
endcg
}
}
}
如上图，划分为n栏后，对每一栏进行单独处理，即可做到每一栏都同时进行颜色消减。
2.对每一栏同时进行颜色消减（控制阈值可以通过c#代码实现）
代码如下：
shader "unlit/bycshader"
{
properties
{
[perrendererdata] _maintex ("sprite texture", 2d) = "white" {}
_color ("tint", color) = (1,1,1,1)
_stencilcomp ("stencil comparison", float) = 8
_stencil ("stencil id", float) = 0
_stencilop ("stencil operation", float) = 0
_stencilwritemask ("stencil write mask", float) = 255
_stencilreadmask ("stencil read mask", float) = 255
_colormask ("color mask", float) = 15
_lan("lan",float) = 10
_stepx("stepx",range(0.0,1.0))=1.0
[toggle(unity_ui_alphaclip)] _useuialphaclip ("use alpha clip", float) = 0
}
subshader
{
tags
{
"queue"="transparent"
"ignoreprojector"="true"
"rendertype"="transparent"
"previewtype"="plane"
"canusespriteatlas"="true"
}
stencil
{
ref [_stencil]
comp [_stencilcomp]
pass [_stencilop]
readmask [_stencilreadmask]
writemask [_stencilwritemask]
}
cull off
lighting off
zwrite off
ztest [unity_guiztestmode]
blend srcalpha oneminussrcalpha
colormask [_colormask]
pass
{
name "default"
cgprogram
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#include "unitycg.cginc"
#include "unityui.cginc"
#pragma multi_compile __ unity_ui_clip_rect
#pragma multi_compile __ unity_ui_alphaclip
struct appdata_t
{
float4 vertex : position;
float4 color : color;
float2 texcoord : texcoord0;
unity_vertex_input_instance_id
};
struct v2f
{
float4 vertex : sv_position;
fixed4 color : color;
float2 texcoord : texcoord0;
float4 worldposition : texcoord1;
unity_vertex_output_stereo
};
v2f vert(appdata_t v)
{
v2f out;
unity_setup_instance_id(v);
unity_initialize_vertex_output_stereo(out);
out.worldposition = v.vertex;
out.vertex = unityobjecttoclippos(out.worldposition);
out.texcoord = v.texcoord;
out.color = v.color;
return out;
}
sampler2d _maintex;
float _lan;
float _stepx;
float4 frag(v2f in) : sv_target
{
float2 uv = in.texcoord;
uv.x*= _lan;
uv.x = frac(uv.x);
//從這裡開始,顏色值大於指定值stepx的進行消減
int needdiscard = step(_stepx,uv.x);
if(needdiscard == 1){
discard;
}
return float4(uv.xy,1.0,1.0);
}
endcg
}
}
}
效果如下：
3.加上切变，百叶窗在关闭打开时，是有透视变化的。用切变可以近似模拟透视，因为透视的实现代价很大，所以用切变。
添加一张图片，并进行切变
代码如下：
shader "unlit/bycshader"
{
properties
{
[perrendererdata] _maintex ("sprite texture", 2d) = "white" {}
_color ("tint", color) = (1,1,1,1)
_stencilcomp ("stencil comparison", float) = 8
_stencil ("stencil id", float) = 0
_stencilop ("stencil operation", float) = 0
_stencilwritemask ("stencil write mask", float) = 255
_stencilreadmask ("stencil read mask", float) = 255
_colormask ("color mask", float) = 15
_lan("lan",float) = 10
_stepx("stepx",range(0.0,1.0))=1.0
[toggle(unity_ui_alphaclip)] _useuialphaclip ("use alpha clip", float) = 0
}
subshader
{
tags
{
"queue"="transparent"
"ignoreprojector"="true"
"rendertype"="transparent"
"previewtype"="plane"
"canusespriteatlas"="true"
}
stencil
{
ref [_stencil]
comp [_stencilcomp]
pass [_stencilop]
readmask [_stencilreadmask]
writemask [_stencilwritemask]
}
cull off
lighting off
zwrite off
ztest [unity_guiztestmode]
blend srcalpha oneminussrcalpha
colormask [_colormask]
pass
{
name "default"
cgprogram
#pragma vertex vert
#pragma fragment frag
#pragma target 2.0
#include "unitycg.cginc"
#include "unityui.cginc"
#pragma multi_compile __ unity_ui_clip_rect
#pragma multi_compile __ unity_ui_alphaclip
struct appdata_t
{
float4 vertex : position;
float4 color : color;
float2 texcoord : texcoord0;
unity_vertex_input_instance_id
};
struct v2f
{
float4 vertex : sv_position;
fixed4 color : color;
float2 texcoord : texcoord0;
float4 worldposition : texcoord1;
unity_vertex_output_stereo
};
v2f vert(appdata_t v)
{
v2f out;
unity_setup_instance_id(v);
unity_initialize_vertex_output_stereo(out);
out.worldposition = v.vertex;
out.vertex = unityobjecttoclippos(out.worldposition);
out.texcoord = v.texcoord;
out.color = v.color;
return out;
}
sampler2d _maintex;
float _lan;
float _stepx;
float4 frag(v2f in) : sv_target
{
//這裡進行裁剪
float2 uv = in.texcoord;
uv.x*= _lan;
uv.x = frac(uv.x);
int needdiscard = step(_stepx,uv.x);
if(needdiscard == 1){
discard;
}
//这里进行切变
float x1 = uv.x;
uv = in.texcoord;
uv+=float2(-0.5,-0.5);
uv.x-=x1;//切變時，先將重心調整到中心，然后绕每一栏的起点进行切变（这里类似于绕某一点旋转，所以后面要进行反向操作，加了就减，减了就加）
float2x2 qiebian = float2x2(1,0,(1.0-_stepx),1);
uv = mul(qiebian,uv);
uv-=float2(-0.5,-0.5);
uv.x+=x1;
float4 color= tex2d(_maintex, uv);
return color;
}
endcg
}
}
}
效果如下：
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