iOS SceneKit SCNTechnique Metal vertex and fragment methods not work in iOS12

0

I have a dictionary file for the SCNSceneView.technique as below:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

    <key>targets</key>

    <dict>

        <key>rt_0</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

        <key>rt_1</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

    </dict>

    <key>passes</key>

    <dict>

        <key>pass_final</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_final</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>blurSampler</key>

                <string>rt_1</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>COLOR</string>

            </dict>

        </dict>

        <key>pass_vert</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_vert</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_0</string>

            </dict>

        </dict>

        <key>pass_hori</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_hori</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>rt_0</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_1</string>

            </dict>

        </dict>

    </dict>

    <key>sequence</key>

    <array>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_final</string>

    </array>

    <key>symbols</key>

    <dict>

        <key>vertexSymbol</key>

        <dict>

            <key>semantic</key>

            <string>vertex</string>

        </dict>

    </dict>

    <key>reflectionResolutionScaleFactor</key>

    <string>0.5</string>

</dict>

</plist>

The metal file for passes in the technique file is as below:

#include <metal_stdlib>

using namespace metal;

#include <SceneKit/scn_metal>



struct custom_vertex_t

{

    float4 position [[attribute(SCNVertexSemanticPosition)]];

};



constexpr sampler s = sampler(coord::normalized,

                              address::repeat,

                              filter::linear);



constexpr sampler sClamp = sampler(coord::normalized,

                              filter::linear);



struct out_vertex_t

{

    float4 position [[position]];

    float2 uv;

};



vertex out_vertex_t pass_through_vertex(custom_vertex_t in [[stage_in]])

{

    out_vertex_t out;

    out.position = in.position;

    out.uv = float2((in.position.x + 1.0) * 0.5 , (in.position.y + 1.0) * -0.5 + 1.0);

    return out;

};



// http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/

constant float offset = { 0.0, 1.0, 2.0, 3.0, 4.0 };

constant float weight = { 0.2270270270, 0.1945945946, 0.1216216216, 0.0540540541, 0.0162162162 };



fragment half4 pass_through_fragment_hori(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(offset[i], 0.0)/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(offset[i], 0.0)/224.0 ) ) * weight[i];

    }



    return half4(FragmentColor);

}



fragment half4 pass_through_fragment_vert(out_vertex_t vert [[stage_in]],

                                     texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(0.0, offset[i])/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(0.0, offset[i])/224.0 ) ) * weight[i];

    }





    return half4(FragmentColor);



};

fragment half4 pass_through_fragment_final(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]],

                                           texture2d<float, access::sample> blurSampler [[texture(1)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv);

    float4 BlurColor = blurSampler.sample( s, vert.uv) * 0.5;

    FragmentColor.xyz += BlurColor.xyz;

    return half4(FragmentColor);

}

Basically the technique is a post process blur filter with chained passes for a sceneView, it worked fine under iOS11 and Xcode9 before.
But after iOS12, I am receiving these error codes:

[SceneKit] Error: Pass XXX(all passes included) is not linked to the rendering graph and will be ignored check it's input/output

It seems that the vertex and fragment metal methods are not linked yet. But I don't know what has changed under iOS 12 and Xcode10.

Does anyone know how to fix the code?

shader metal xcode10 ios12 scntechnique

share|improve this question

edited Nov 20 '18 at 9:56

kobunketsu

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

add a comment | 

0

I have a dictionary file for the SCNSceneView.technique as below:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

    <key>targets</key>

    <dict>

        <key>rt_0</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

        <key>rt_1</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

    </dict>

    <key>passes</key>

    <dict>

        <key>pass_final</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_final</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>blurSampler</key>

                <string>rt_1</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>COLOR</string>

            </dict>

        </dict>

        <key>pass_vert</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_vert</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_0</string>

            </dict>

        </dict>

        <key>pass_hori</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_hori</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>rt_0</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_1</string>

            </dict>

        </dict>

    </dict>

    <key>sequence</key>

    <array>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_final</string>

    </array>

    <key>symbols</key>

    <dict>

        <key>vertexSymbol</key>

        <dict>

            <key>semantic</key>

            <string>vertex</string>

        </dict>

    </dict>

    <key>reflectionResolutionScaleFactor</key>

    <string>0.5</string>

</dict>

</plist>

The metal file for passes in the technique file is as below:

#include <metal_stdlib>

using namespace metal;

#include <SceneKit/scn_metal>



struct custom_vertex_t

{

    float4 position [[attribute(SCNVertexSemanticPosition)]];

};



constexpr sampler s = sampler(coord::normalized,

                              address::repeat,

                              filter::linear);



constexpr sampler sClamp = sampler(coord::normalized,

                              filter::linear);



struct out_vertex_t

{

    float4 position [[position]];

    float2 uv;

};



vertex out_vertex_t pass_through_vertex(custom_vertex_t in [[stage_in]])

{

    out_vertex_t out;

    out.position = in.position;

    out.uv = float2((in.position.x + 1.0) * 0.5 , (in.position.y + 1.0) * -0.5 + 1.0);

    return out;

};



// http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/

constant float offset = { 0.0, 1.0, 2.0, 3.0, 4.0 };

constant float weight = { 0.2270270270, 0.1945945946, 0.1216216216, 0.0540540541, 0.0162162162 };



fragment half4 pass_through_fragment_hori(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(offset[i], 0.0)/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(offset[i], 0.0)/224.0 ) ) * weight[i];

    }



    return half4(FragmentColor);

}



fragment half4 pass_through_fragment_vert(out_vertex_t vert [[stage_in]],

                                     texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(0.0, offset[i])/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(0.0, offset[i])/224.0 ) ) * weight[i];

    }





    return half4(FragmentColor);



};

fragment half4 pass_through_fragment_final(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]],

                                           texture2d<float, access::sample> blurSampler [[texture(1)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv);

    float4 BlurColor = blurSampler.sample( s, vert.uv) * 0.5;

    FragmentColor.xyz += BlurColor.xyz;

    return half4(FragmentColor);

}

Basically the technique is a post process blur filter with chained passes for a sceneView, it worked fine under iOS11 and Xcode9 before.
But after iOS12, I am receiving these error codes:

[SceneKit] Error: Pass XXX(all passes included) is not linked to the rendering graph and will be ignored check it's input/output

It seems that the vertex and fragment metal methods are not linked yet. But I don't know what has changed under iOS 12 and Xcode10.

Does anyone know how to fix the code?

shader metal xcode10 ios12 scntechnique

share|improve this question

edited Nov 20 '18 at 9:56

kobunketsu

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

add a comment | 

0

0

0

I have a dictionary file for the SCNSceneView.technique as below:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

    <key>targets</key>

    <dict>

        <key>rt_0</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

        <key>rt_1</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

    </dict>

    <key>passes</key>

    <dict>

        <key>pass_final</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_final</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>blurSampler</key>

                <string>rt_1</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>COLOR</string>

            </dict>

        </dict>

        <key>pass_vert</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_vert</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_0</string>

            </dict>

        </dict>

        <key>pass_hori</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_hori</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>rt_0</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_1</string>

            </dict>

        </dict>

    </dict>

    <key>sequence</key>

    <array>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_final</string>

    </array>

    <key>symbols</key>

    <dict>

        <key>vertexSymbol</key>

        <dict>

            <key>semantic</key>

            <string>vertex</string>

        </dict>

    </dict>

    <key>reflectionResolutionScaleFactor</key>

    <string>0.5</string>

</dict>

</plist>

The metal file for passes in the technique file is as below:

#include <metal_stdlib>

using namespace metal;

#include <SceneKit/scn_metal>



struct custom_vertex_t

{

    float4 position [[attribute(SCNVertexSemanticPosition)]];

};



constexpr sampler s = sampler(coord::normalized,

                              address::repeat,

                              filter::linear);



constexpr sampler sClamp = sampler(coord::normalized,

                              filter::linear);



struct out_vertex_t

{

    float4 position [[position]];

    float2 uv;

};



vertex out_vertex_t pass_through_vertex(custom_vertex_t in [[stage_in]])

{

    out_vertex_t out;

    out.position = in.position;

    out.uv = float2((in.position.x + 1.0) * 0.5 , (in.position.y + 1.0) * -0.5 + 1.0);

    return out;

};



// http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/

constant float offset = { 0.0, 1.0, 2.0, 3.0, 4.0 };

constant float weight = { 0.2270270270, 0.1945945946, 0.1216216216, 0.0540540541, 0.0162162162 };



fragment half4 pass_through_fragment_hori(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(offset[i], 0.0)/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(offset[i], 0.0)/224.0 ) ) * weight[i];

    }



    return half4(FragmentColor);

}



fragment half4 pass_through_fragment_vert(out_vertex_t vert [[stage_in]],

                                     texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(0.0, offset[i])/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(0.0, offset[i])/224.0 ) ) * weight[i];

    }





    return half4(FragmentColor);



};

fragment half4 pass_through_fragment_final(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]],

                                           texture2d<float, access::sample> blurSampler [[texture(1)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv);

    float4 BlurColor = blurSampler.sample( s, vert.uv) * 0.5;

    FragmentColor.xyz += BlurColor.xyz;

    return half4(FragmentColor);

}

Basically the technique is a post process blur filter with chained passes for a sceneView, it worked fine under iOS11 and Xcode9 before.
But after iOS12, I am receiving these error codes:

[SceneKit] Error: Pass XXX(all passes included) is not linked to the rendering graph and will be ignored check it's input/output

It seems that the vertex and fragment metal methods are not linked yet. But I don't know what has changed under iOS 12 and Xcode10.

Does anyone know how to fix the code?

shader metal xcode10 ios12 scntechnique

share|improve this question

edited Nov 20 '18 at 9:56

kobunketsu

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

I have a dictionary file for the SCNSceneView.technique as below:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

    <key>targets</key>

    <dict>

        <key>rt_0</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

        <key>rt_1</key>

        <dict>

            <key>size</key>

            <string>128x256</string>

            <key>type</key>

            <string>color</string>

        </dict>

    </dict>

    <key>passes</key>

    <dict>

        <key>pass_final</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_final</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>blurSampler</key>

                <string>rt_1</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>COLOR</string>

            </dict>

        </dict>

        <key>pass_vert</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_vert</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>COLOR</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_0</string>

            </dict>

        </dict>

        <key>pass_hori</key>

        <dict>

            <key>draw</key>

            <string>DRAW_QUAD</string>

            <key>program</key>

            <string>doesntexist</string>

            <key>metalVertexShader</key>

            <string>pass_through_vertex</string>

            <key>metalFragmentShader</key>

            <string>pass_through_fragment_hori</string>

            <key>inputs</key>

            <dict>

                <key>colorSampler</key>

                <string>rt_0</string>

                <key>aPos</key>

                <string>vertexSymbol</string>

            </dict>

            <key>outputs</key>

            <dict>

                <key>color</key>

                <string>rt_1</string>

            </dict>

        </dict>

    </dict>

    <key>sequence</key>

    <array>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_vert</string>

        <string>pass_hori</string>

        <string>pass_final</string>

    </array>

    <key>symbols</key>

    <dict>

        <key>vertexSymbol</key>

        <dict>

            <key>semantic</key>

            <string>vertex</string>

        </dict>

    </dict>

    <key>reflectionResolutionScaleFactor</key>

    <string>0.5</string>

</dict>

</plist>

The metal file for passes in the technique file is as below:

#include <metal_stdlib>

using namespace metal;

#include <SceneKit/scn_metal>



struct custom_vertex_t

{

    float4 position [[attribute(SCNVertexSemanticPosition)]];

};



constexpr sampler s = sampler(coord::normalized,

                              address::repeat,

                              filter::linear);



constexpr sampler sClamp = sampler(coord::normalized,

                              filter::linear);



struct out_vertex_t

{

    float4 position [[position]];

    float2 uv;

};



vertex out_vertex_t pass_through_vertex(custom_vertex_t in [[stage_in]])

{

    out_vertex_t out;

    out.position = in.position;

    out.uv = float2((in.position.x + 1.0) * 0.5 , (in.position.y + 1.0) * -0.5 + 1.0);

    return out;

};



// http://rastergrid.com/blog/2010/09/efficient-gaussian-blur-with-linear-sampling/

constant float offset = { 0.0, 1.0, 2.0, 3.0, 4.0 };

constant float weight = { 0.2270270270, 0.1945945946, 0.1216216216, 0.0540540541, 0.0162162162 };



fragment half4 pass_through_fragment_hori(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(offset[i], 0.0)/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(offset[i], 0.0)/224.0 ) ) * weight[i];

    }



    return half4(FragmentColor);

}



fragment half4 pass_through_fragment_vert(out_vertex_t vert [[stage_in]],

                                     texture2d<float, access::sample> colorSampler [[texture(0)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv) * weight[0];

    for (int i=1; i<5; i++) {

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv + float2(0.0, offset[i])/224.0 ) ) * weight[i];

        FragmentColor += colorSampler.sample( sClamp, ( vert.uv - float2(0.0, offset[i])/224.0 ) ) * weight[i];

    }





    return half4(FragmentColor);



};

fragment half4 pass_through_fragment_final(out_vertex_t vert [[stage_in]],

                                          texture2d<float, access::sample> colorSampler [[texture(0)]],

                                           texture2d<float, access::sample> blurSampler [[texture(1)]])

{



    float4 FragmentColor = colorSampler.sample( s, vert.uv);

    float4 BlurColor = blurSampler.sample( s, vert.uv) * 0.5;

    FragmentColor.xyz += BlurColor.xyz;

    return half4(FragmentColor);

}

Basically the technique is a post process blur filter with chained passes for a sceneView, it worked fine under iOS11 and Xcode9 before.
But after iOS12, I am receiving these error codes:

[SceneKit] Error: Pass XXX(all passes included) is not linked to the rendering graph and will be ignored check it's input/output

It seems that the vertex and fragment metal methods are not linked yet. But I don't know what has changed under iOS 12 and Xcode10.

Does anyone know how to fix the code?

shader metal xcode10 ios12 scntechnique

shader metal xcode10 ios12 scntechnique

share|improve this question

edited Nov 20 '18 at 9:56

kobunketsu

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

share|improve this question

edited Nov 20 '18 at 9:56

kobunketsu

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

share|improve this question

share|improve this question

edited Nov 20 '18 at 9:56

kobunketsu

edited Nov 20 '18 at 9:56

kobunketsu

edited Nov 20 '18 at 9:56

kobunketsu

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

asked Nov 20 '18 at 9:50

kobunketsukobunketsu

6718

6718

add a comment | 

add a comment | 

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