I write a vertex shader for skinned animation. But I got an error when I call Program3D::upload( kShader.m_kAGALShaderPair.vertexProgram.byteCode, kShader.m_kAGALShaderPair.fragmentProgram.byteCode ) :

Error: Error #3648: AGAL 验证失败: 对于 vertex 程序的 14 令牌中的 source operand 1，可读取临时寄存器组件，但无法写入。

    at flash.display3D::Program3D/upload()

in english:

Error: Error #3648:AGAL Verify failed: vertex program's 14 token source operand 1, read temporary register component, can not write.

The shader is:

<languageVersion: 1.0;>

vertex kernel TestSkinned3D <namespace: "Pixel Bender 3D examples";

                        vendor: "Adobe";

                        version: 1;>

{

        parameter float4x4 inp_matSkinWorldViewProject;

        parameter float4 inp_matSkinBone[90];

    input vertex float3 in_vtxPos

    <

            id : "PB3D_POSITION";

    >;

    input vertex float4 in_vtxWeight

    <

            id : "PB3D_WEIGHT";

    >;

    input vertex float4 in_vtxBoneIndex

    <

            id : "PB3D_BONE_INDEX";

    >;

    output float4 out_vtxClipPos;

    void evaluateVertex()

    {             

            int4 iIndex = int4(in_vtxBoneIndex);          

            //float fWeight4 = 1.0 - in_vtxWeight.x - in_vtxWeight.y - in_vtxWeight.z;

            float4 inPos4 = float4( in_vtxPos.x, in_vtxPos.y, in_vtxPos.z, 1.0 );

            float4 f4BonePos;                            

        f4BonePos.x = dot( inPos4, inp_matSkinBone[iIndex.x] ) * in_vtxWeight.x ;       

        f4BonePos.y = dot( inPos4, inp_matSkinBone[iIndex.x + 1] ) * in_vtxWeight.x;        

        f4BonePos.z = dot( inPos4, inp_matSkinBone[iIndex.x + 2] ) * in_vtxWeight.x;

        f4BonePos.x += dot( inPos4, inp_matSkinBone[iIndex.y] ) * in_vtxWeight.y;

        f4BonePos.y += dot( inPos4, inp_matSkinBone[iIndex.y + 1] ) * in_vtxWeight.y;

        f4BonePos.z += dot( inPos4, inp_matSkinBone[iIndex.y + 2] ) * in_vtxWeight.y;  

        f4BonePos.x += dot( inPos4, inp_matSkinBone[iIndex.z] ) * in_vtxWeight.z;

        f4BonePos.y += dot( inPos4, inp_matSkinBone[iIndex.z + 1] ) * in_vtxWeight.z;

        f4BonePos.z += dot( inPos4, inp_matSkinBone[iIndex.z + 2] ) * in_vtxWeight.z;        

        f4BonePos.x += dot( inPos4, inp_matSkinBone[iIndex.w] ) * in_vtxWeight.w;

        f4BonePos.y += dot( inPos4, inp_matSkinBone[iIndex.w + 1] ) * in_vtxWeight.w;

        f4BonePos.z += dot( inPos4, inp_matSkinBone[iIndex.w + 2] ) * in_vtxWeight.w;

        f4BonePos.w = 1.0;

                out_vtxClipPos = f4BonePos * inp_matSkinWorldViewProject;           

    }

}