从 DX9 到 DX11 的顶点着色器编译错误（Unity 5.6 到 2017.4）

Question

我有一个使用自定义着色器的 Unity 图像 post 效果，在从 Unity 5.6 迁移到 Unity 2017.4 时抛出错误

Assertion failed: Failed to create DX11 vertex declaration; something wrong with vertex shader input data? (hr=80070057)

这似乎是这个脚本中的错误。

Shader "SG/Stretch Shadows" {
Properties {
    _MainTex ("Light texture", 2D) = "white" {}
}
SubShader {
    LOD 100
    Blend One Zero
    Cull Off
    ZWrite Off
    Lighting Off

    Pass {    // 0 Blacken source
        CGPROGRAM
            #pragma target 3.0

            #include "UnityCG.cginc"
            #pragma vertex processVerts
            #pragma fragment drawFrag

            #pragma glsl_no_auto_normalization

            struct vertdata {
                float2 uv : TEXCOORD0;
                float2 uvScaled : TEXCOORD1;
                float4 vertex : POSITION;
            };

            struct frag_v2f {
                float4 vertex : SV_POSITION;
                half2 uv : TEXCOORD0;
            };

            uniform sampler2D _MainTex;

            frag_v2f processVerts (vertdata v){
                frag_v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                 o.uv = v.uv;
                return o;
            }

            half4 drawFrag (frag_v2f i) : SV_Target {
                fixed4 shadow = tex2D(_MainTex, i.uv);
                half intensity = max(shadow.r, max(shadow.g, shadow.b));
                intensity = step(intensity,0.1);
                return 1-intensity;
            }

        ENDCG
    }

    Pass {    // 1 Stretch
        CGPROGRAM
            #pragma target 3.0

            #include "UnityCG.cginc"
            #pragma vertex processVerts
            #pragma fragment drawFrag

            #pragma glsl_no_auto_normalization

            struct vertdata {
                float2 uv : TEXCOORD0;
                float2 uvScaled : TEXCOORD1;
                float4 vertex : SV_POSITION;
            };

            struct frag_v2f {
                float4 vertex : SV_POSITION;
                half2 basePos : TEXCOORD0;
                half2 zoomPos : TEXCOORD1;
            };

            uniform sampler2D _ObstacleTex;
            uniform sampler2D _MainTex;
            half4 _SunPos;
            #ifdef UNITY_HALF_TEXEL_OFFSET
            #endif

            frag_v2f processVerts (vertdata v){
                frag_v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                 o.basePos = v.uv;
                o.zoomPos = v.uv * _SunPos.zw + (_SunPos.xy -_SunPos.zw*0.5);
                return o;
            }

            half4 drawFrag (frag_v2f i) : SV_Target {
                half2 basePos = i.basePos;
                half2 zoomPos = i.zoomPos;
                half4 tex = tex2D(_MainTex, i.basePos);

                half sub = 1.0/60;
                half len = length((basePos - zoomPos));

                half4 col = tex*tex.a;
                col = half4(0,0,0,0);
                half pos = 1;
                half power = 0.5;

                for(int i = 0; i < 60; i++){
                    pos -= sub;
                    half4 obstacle = tex2D(_MainTex, lerp(zoomPos, basePos, pos));
                    obstacle *= pow(pos, power);
                    col = max(col, obstacle);
                }

                return 1-col;//half4(half3((basePos - zoomPos).x*20), 1);//tex2D(_ObstacleTex, basePos);
            }

        ENDCG
    }

    Pass {    // 2 Blacken alpha
        CGPROGRAM
            #pragma target 3.0

            #include "UnityCG.cginc"
            #pragma vertex processVerts
            #pragma fragment drawFrag

            #pragma glsl_no_auto_normalization

            struct vertdata {
                float2 uv : TEXCOORD0;
                float2 uvScaled : TEXCOORD1;
                float4 vertex : SV_POSITION;
            };

            struct frag_v2f {
                float4 vertex : SV_POSITION;
                half2 uv : TEXCOORD0;
            };

            uniform sampler2D _MainTex;

            frag_v2f processVerts (vertdata v){
                frag_v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                 o.uv = v.uv;
                return o;
            }

            half4 drawFrag (frag_v2f i) : SV_Target {
                fixed4 shadow = tex2D(_MainTex, i.uv);
                half4 intensity = half4(0,0.2,0.2,shadow.a);
                intensity = lerp(shadow, intensity, shadow.a);

                return intensity;
            }

        ENDCG
    }

    Pass {    // 3 Draw fully zoomed shadow and half zoomed shadow
        // Each pass duplicates previous pass, doubling drawn shadows
        CGPROGRAM
            #pragma target 3.0

            #include "UnityCG.cginc"
            #pragma vertex processVerts
            #pragma fragment drawFrag

            #pragma glsl_no_auto_normalization

            struct vertdata {
                float2 uv : TEXCOORD0;
                float2 uvScaled : TEXCOORD1;
                float4 vertex : SV_POSITION;
            };

            struct frag_v2f {
                float4 vertex : SV_POSITION;
                half2 basePos : TEXCOORD0;
                half2 zoomPos : TEXCOORD1;
            };

            uniform sampler2D _ObstacleTex;
            uniform sampler2D _MainTex;
            half4 _SunPos;
            half _Offset;                                            // frational lerp value. Decrease by powers of two each pass
            #ifdef UNITY_HALF_TEXEL_OFFSET
            #endif

            frag_v2f processVerts (vertdata v){
                frag_v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                 o.basePos = v.uv;
                o.zoomPos = v.uv * _SunPos.zw + (_SunPos.xy -_SunPos.zw*0.5);
                return o;
            }

            half4 drawFrag (frag_v2f i) : SV_Target {
                half2 basePos = i.basePos;
                half2 zoomPos = i.zoomPos;
                half firstPass = tex2D(_MainTex, basePos).a;
                half secondPass = tex2D(_MainTex, zoomPos).a-0.85;
                half4 output = half4(0,0,0,max(firstPass, secondPass));
                secondPass = tex2D(_MainTex, lerp(zoomPos, basePos, 0.65)).a-0.3;
                output.a = max(output.a, secondPass);
                secondPass = tex2D(_MainTex, lerp(zoomPos, basePos, 0.4)).a-0.45;
                output.a = max(output.a, secondPass);
                secondPass = tex2D(_MainTex, lerp(zoomPos, basePos, 0.25)).a-0.6;
                output.a = max(output.a, secondPass);
                secondPass = tex2D(_MainTex, lerp(zoomPos, basePos, 0.1)).a-0.7;
                output.a = max(output.a, secondPass);

                return output;//half4(half3((basePos - zoomPos).x*20), 1);//tex2D(_ObstacleTex, basePos);
            }

        ENDCG
    }

Pass {    // 4 Single pass. Ping-pong
        // Each pass duplicates previous pass, doubling drawn shadows
        CGPROGRAM
            #pragma target 3.0

            #include "UnityCG.cginc"
            #pragma vertex processVerts
            #pragma fragment drawFrag

            #pragma glsl_no_auto_normalization

            struct vertdata {
                float2 uv : TEXCOORD0;
                float2 uvScaled : TEXCOORD1;
                float4 vertex : SV_POSITION;
            };

            struct frag_v2f {
                float4 vertex : SV_POSITION;
                half2 basePos : TEXCOORD0;
                half2 zoomPos : TEXCOORD1;
            };

            uniform sampler2D _ObstacleTex;
            uniform sampler2D _MainTex;
            half4 _SunPos;
            half _Offset;                                            // frational lerp value. Decrease by powers of two each pass
            #ifdef UNITY_HALF_TEXEL_OFFSET
            #endif

            frag_v2f processVerts (vertdata v){
                frag_v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                 o.basePos = v.uv;
                o.zoomPos = v.uv * _SunPos.zw + (_SunPos.xy -_SunPos.zw*0.5);
                return o;
            }

            half4 drawFrag (frag_v2f i) : SV_Target {
                half firstPass = tex2D(_MainTex, i.basePos).a;
                half secondPass = tex2D(_MainTex, lerp(i.zoomPos, i.basePos, _Offset)).a;
                half4 output = half4(0,0,0,max(firstPass, secondPass));
                return output;
            }

        ENDCG
    }
}

构建工具不提供任何有关错误脚本或行号的详细信息。关于 Unity post 效果的文档没有涵盖任何细节。 Google 没有发现其他人遇到同样的问题。我发现的唯一一件事是有人建议 SV_POSITION 应该替换为 POSITION，我尝试了各种组合都没有成功。

我也在Unity中新建了一个image effect shader来对比，代码看起来是一样的。

为 post 效果创建合适的顶点着色器的正确形式是什么？或者这甚至是我的代码的问题？

Answer 1

你很接近！ SV_POSITION 语义用于传递给片段着色器的顶点位置。

从 vertdata 结构中的 SV_POSITION 中删除所有 SV_ 前缀。例如：

struct vertdata
{
    float2 uv : TEXCOORD0;
    float2 uvScaled : TEXCOORD1;
    float4 vertex : POSITION;    // <- Remove here
};

struct frag_v2f
{
    float4 vertex : SV_POSITION; // <- Keep here
    half2 uv : TEXCOORD0;
};

从 DX9 到 DX11 的顶点着色器编译错误（Unity 5.6 到 2017.4）

Vertex shader compilation error from DX9 to DX11 (Unity 5.6 to 2017.4)

graphics

shader

hlsl

unity3d