uniform sampler2D morphDataPos;
uniform sampler2D morphDataNor;
uniform vec2 morphScaleOffset;
uniform vec2 morphDataDim;
uniform vec4 morphWeights[8];

void getMorphedVertex(vec2 uvCoord, inout vec3 A, vec4 imorph) {
    vec3 morph = texture(morphDataPos, uvCoord).rgb * morphScaleOffset.x + morphScaleOffset.y;
    A += imorph.x * morph; 

    morph = texture(morphDataPos, vec2(uvCoord.x, uvCoord.y - morphDataDim.y)).rgb * morphScaleOffset.x + morphScaleOffset.y;
    A += imorph.y * morph;

    morph = texture(morphDataPos, vec2(uvCoord.x, uvCoord.y - 2.0 * morphDataDim.y)).rgb * morphScaleOffset.x + morphScaleOffset.y;
    A += imorph.z * morph;

    morph = texture(morphDataPos, vec2(uvCoord.x, uvCoord.y - 3.0 * morphDataDim.y)).rgb * morphScaleOffset.x + morphScaleOffset.y;
    A += imorph.w * morph;
}

void getMorphedNormal(vec2 uvCoord, vec3 oldNor, inout vec3 morphNor, vec4 imorph) {
    vec3 norm = oldNor + imorph.x * (texture(morphDataNor, uvCoord).rgb * 2.0 - 1.0);
    morphNor += norm;

    norm = oldNor + imorph.y * (texture(morphDataNor, vec2(uvCoord.x, uvCoord.y - morphDataDim.y)).rgb * 2.0 - 1.0);
    morphNor += norm;

    norm = oldNor + imorph.z * (texture(morphDataNor, vec2(uvCoord.x, uvCoord.y - 2.0 * morphDataDim.y)).rgb * 2.0 - 1.0);
    morphNor += norm;

    norm = oldNor + imorph.w * (texture(morphDataNor, vec2(uvCoord.x, uvCoord.y - 3.0 * morphDataDim.y)).rgb * 2.0 - 1.0);
    morphNor += norm;
    
    morphNor = normalize(morphNor);
}

void getMorphedVertex(vec2 uvCoord, inout vec3 A){
    vec3 totalDelta = vec3(0.0);
    for(int i = 0; i<8; i++ )
    {        
        vec4 tempCoordY = vec4( uvCoord.y -     (i * 4) * morphDataDim.y, 
                                uvCoord.y - (i * 4 + 1) * morphDataDim.y,
                                uvCoord.y - (i * 4 + 2) * morphDataDim.y,
                                uvCoord.y - (i * 4 + 3) * morphDataDim.y);

        vec3 morph = texture(morphDataPos, vec2(uvCoord.x, tempCoordY.x)).rgb * morphScaleOffset.x + morphScaleOffset.y;
        totalDelta += morphWeights[i].x * morph;

        morph = texture(morphDataPos, vec2(uvCoord.x, tempCoordY.y)).rgb * morphScaleOffset.x + morphScaleOffset.y;
        totalDelta += morphWeights[i].y * morph;

        morph = texture(morphDataPos, vec2(uvCoord.x, tempCoordY.z)).rgb * morphScaleOffset.x + morphScaleOffset.y;
        totalDelta += morphWeights[i].z * morph;

        morph = texture(morphDataPos, vec2(uvCoord.x, tempCoordY.w)).rgb * morphScaleOffset.x + morphScaleOffset.y;
        totalDelta += morphWeights[i].w * morph;
    }
    //float deltaLength = length(totalDelta);
    //if (deltaLength > 5.0) {
        // clamp corrupted data
        //totalDelta = normalize(totalDelta) * 5.0;
    //}
    A += totalDelta;
}

void getMorphedNormal(vec2 uvCoord, vec3 oldNor, inout vec3 morphNor){

    vec3 normalDelta = vec3(0.0);
    for(int i = 0; i<8; i++ )
    {
        vec4 tempCoordY = vec4( uvCoord.y -     (i * 4) * morphDataDim.y, 
                                uvCoord.y - (i * 4 + 1) * morphDataDim.y,
                                uvCoord.y - (i * 4 + 2) * morphDataDim.y,
                                uvCoord.y - (i * 4 + 3) * morphDataDim.y);
        
        normalDelta += morphWeights[i].x * (texture(morphDataNor, vec2(uvCoord.x, tempCoordY.x)).rgb * 2.0 - 1.0);
        normalDelta += morphWeights[i].y * (texture(morphDataNor, vec2(uvCoord.x, tempCoordY.y)).rgb * 2.0 - 1.0);
        normalDelta += morphWeights[i].z * (texture(morphDataNor, vec2(uvCoord.x, tempCoordY.z)).rgb * 2.0 - 1.0);
        normalDelta += morphWeights[i].w * (texture(morphDataNor, vec2(uvCoord.x, tempCoordY.w)).rgb * 2.0 - 1.0);
    }
    
    morphNor = normalize(oldNor + normalDelta);
}