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https://github.com/PixarAnimationStudios/OpenSubdiv
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Adding vertex color in the second face-varying channel.
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Pol Jeremias-Vila
Pol
parent
2587f6ea07
commit
b18abaabc8
@ -88,14 +88,14 @@ private:
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// Similarly to our 'Vertex' container, we add a minimaliztic interpolation
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// interface with a 'Clear()' and 'AddWithWeight()' methods.
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//
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struct FVarVertex {
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struct FVarVertexUV {
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// Minimal required interface ----------------------
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void Clear() {
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u=v=0.0f;
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}
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void AddWithWeight(FVarVertex const & src, float weight) {
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void AddWithWeight(FVarVertexUV const & src, float weight) {
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u += weight * src.u;
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v += weight * src.v;
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}
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@ -104,9 +104,28 @@ struct FVarVertex {
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float u,v;
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};
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struct FVarVertexColor {
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// Minimal required interface ----------------------
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void Clear() {
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r=g=b=a=0.0f;
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}
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void AddWithWeight(FVarVertexColor const & src, float weight) {
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r += weight * src.r;
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g += weight * src.g;
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b += weight * src.b;
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a += weight * src.a;
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}
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// Basic 'color' layout channel
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float r,g,b,a;
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};
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//------------------------------------------------------------------------------
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// Cube geometry from catmark_cube.h
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// 'vertex' primitive variable data & topology
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static float g_verts[8][3] = {{ -0.5f, -0.5f, 0.5f },
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{ 0.5f, -0.5f, 0.5f },
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@ -128,8 +147,7 @@ static int g_vertIndices[24] = { 0, 1, 3, 2,
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1, 7, 5, 3,
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6, 0, 2, 4 };
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// 'face-varying' primitive variable data & topology
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// 'face-varying' primitive variable data & topology for UVs
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static float g_uvs[14][2] = {{ 0.375, 0.00 },
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{ 0.625, 0.00 },
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{ 0.375, 0.25 },
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@ -154,6 +172,41 @@ static int g_uvIndices[24] = { 0, 1, 3, 2,
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1, 10, 11, 3,
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12, 0, 2, 13 };
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// 'face-varying' primitive variable data & topology for color
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static float g_colors[24][4] = {{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 0.0, 0.0, 1.0},
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{1.0, 0.0, 0.0, 1.0},
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{1.0, 0.0, 0.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0},
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{1.0, 1.0, 1.0, 1.0}};
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static int g_ncolors = 24;
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static int g_colorIndices[24] = { 0, 3, 9, 6,
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7, 10, 15, 12,
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13, 16, 21, 18,
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19, 22, 4, 1,
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5, 23, 17, 11,
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20, 2, 8, 14 };
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using namespace OpenSubdiv;
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//------------------------------------------------------------------------------
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@ -176,14 +229,19 @@ int main(int, char **) {
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desc.numVertsPerFace = g_vertsperface;
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desc.vertIndicesPerFace = g_vertIndices;
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int channelUV = 0;
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int channelColor = 1;
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// Create a face-varying channel descriptor
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Descriptor::FVarChannel uvs;
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uvs.numValues = g_nuvs;
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uvs.valueIndices = g_uvIndices;
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Descriptor::FVarChannel channels[2];
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channels[channelUV].numValues = g_nuvs;
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channels[channelUV].valueIndices = g_uvIndices;
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channels[channelColor].numValues = g_ncolors;
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channels[channelColor].valueIndices = g_colorIndices;
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// Add the channel topology to the main descriptor
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desc.numFVarChannels = 1;
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desc.fvarChannels = & uvs;
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desc.numFVarChannels = 2;
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desc.fvarChannels = channels;
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// Instantiate a FarTopologyRefiner from the descriptor
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Far::TopologyRefiner * refiner =
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@ -207,34 +265,43 @@ int main(int, char **) {
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verts[i].SetPosition(g_verts[i][0], g_verts[i][1], g_verts[i][2]);
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}
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// Allocate and initialize the single channel of 'face-varying' primvar data
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int channel = 0;
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std::vector<FVarVertex> fvBuffer(refiner->GetNumFVarValuesTotal(channel));
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FVarVertex * fvVerts = &fvBuffer[0];
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// Allocate and initialize the first channel of 'face-varying' primvar data (UVs)
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std::vector<FVarVertexUV> fvBufferUV(refiner->GetNumFVarValuesTotal(channelUV));
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FVarVertexUV * fvVertsUV = &fvBufferUV[0];
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for (int i=0; i<g_nuvs; ++i) {
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fvVerts[i].u = g_uvs[i][0];
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fvVerts[i].v = g_uvs[i][1];
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fvVertsUV[i].u = g_uvs[i][0];
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fvVertsUV[i].v = g_uvs[i][1];
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}
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// Allocate & interpolate the 'face-varying' primvar data (colors)
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std::vector<FVarVertexColor> fvBufferColor(refiner->GetNumFVarValuesTotal(channelColor));
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FVarVertexColor * fvVertsColor = &fvBufferColor[0];
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for (int i=0; i<g_ncolors; ++i) {
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fvVertsColor[i].r = g_colors[i][0];
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fvVertsColor[i].g = g_colors[i][1];
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fvVertsColor[i].b = g_colors[i][2];
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fvVertsColor[i].a = g_colors[i][3];
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}
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// Interpolate both vertex and face-varying primvar data
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Far::PrimvarRefiner primvarRefiner(*refiner);
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Vertex * srcVert = verts;
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FVarVertex * srcFVar = fvVerts;
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FVarVertexUV * srcFVarUV = fvVertsUV;
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FVarVertexColor * srcFVarColor = fvVertsColor;
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for (int level = 1; level <= maxlevel; ++level) {
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Vertex * dstVert = srcVert + refiner->GetLevel(level-1).GetNumVertices();
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FVarVertex * dstFVar = srcFVar + refiner->GetLevel(level-1).GetNumFVarValues(channel);
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FVarVertexUV * dstFVarUV = srcFVarUV + refiner->GetLevel(level-1).GetNumFVarValues(channelUV);
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FVarVertexColor * dstFVarColor = srcFVarColor + refiner->GetLevel(level-1).GetNumFVarValues(channelColor);
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primvarRefiner.Interpolate(level, srcVert, dstVert);
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primvarRefiner.InterpolateFaceVarying(level, srcFVar, dstFVar, channel);
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primvarRefiner.InterpolateFaceVarying(level, srcFVarUV, dstFVarUV, channelUV);
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primvarRefiner.InterpolateFaceVarying(level, srcFVarColor, dstFVarColor, channelColor);
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srcVert = dstVert;
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srcFVar = dstFVar;
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srcFVarUV = dstFVarUV;
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srcFVarColor = dstFVarColor;
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}
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@ -243,7 +310,8 @@ int main(int, char **) {
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Far::TopologyLevel const & refLastLevel = refiner->GetLevel(maxlevel);
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int nverts = refLastLevel.GetNumVertices();
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int nuvs = refLastLevel.GetNumFVarValues(channel);
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int nuvs = refLastLevel.GetNumFVarValues(channelUV);
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int ncolors= refLastLevel.GetNumFVarValues(channelColor);
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int nfaces = refLastLevel.GetNumFaces();
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// Print vertex positions
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@ -255,18 +323,26 @@ int main(int, char **) {
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}
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// Print uvs
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int firstOfLastUvs = refiner->GetNumFVarValuesTotal(channel) - nuvs;
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int firstOfLastUvs = refiner->GetNumFVarValuesTotal(channelUV) - nuvs;
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for (int fvvert = 0; fvvert < nuvs; ++fvvert) {
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FVarVertex const & uv = fvVerts[firstOfLastUvs + fvvert];
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FVarVertexUV const & uv = fvVertsUV[firstOfLastUvs + fvvert];
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printf("vt %f %f\n", uv.u, uv.v);
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}
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// Print colors
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int firstOfLastColors = refiner->GetNumFVarValuesTotal(channelColor) - ncolors;
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for (int fvvert = 0; fvvert < nuvs; ++fvvert) {
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FVarVertexColor const & c = fvVertsColor[firstOfLastColors + fvvert];
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printf("c %f %f %f %f\n", c.r, c.g, c.b, c.a);
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}
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// Print faces
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for (int face = 0; face < nfaces; ++face) {
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Far::ConstIndexArray fverts = refLastLevel.GetFaceVertices(face);
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Far::ConstIndexArray fuvs = refLastLevel.GetFaceFVarValues(face, channel);
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Far::ConstIndexArray fuvs = refLastLevel.GetFaceFVarValues(face, channelUV);
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// all refined Catmark faces should be quads
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assert(fverts.size()==4 and fuvs.size()==4);
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@ -280,4 +356,4 @@ int main(int, char **) {
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}
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}
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}
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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