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This commit is contained in:
Irlan 2019-04-22 13:07:00 -03:00
parent c6a3e47176
commit d2d8ade611
1 changed files with 81 additions and 72 deletions
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153
src/bounce/meshgen/sphere_mesh.cpp
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@ -90,7 +90,8 @@ static inline smEdgeVertexPair* smFind(smEdgeVertexMap& map, u32 v1, u32 v2)
return nullptr;
}
static inline u32 smSubdivideEdge(smMesh& in_out, smEdgeVertexMap& map,
static inline u32 smSubdivideEdge(smMesh& out, smEdgeVertexMap& map,
const smMesh& in,
u32 i1, u32 i2)
{
smEdgeVertexPair* pair = smFind(map, i2, i1);
@ -104,14 +105,14 @@ static inline u32 smSubdivideEdge(smMesh& in_out, smEdgeVertexMap& map,
newEdge.v1 = i1;
newEdge.v2 = i2;
u32 newVertex = in_out.vertexCount;
u32 newVertex = out.vertexCount;
b3Vec3 v1 = in_out.vertices[i1];
b3Vec3 v2 = in_out.vertices[i2];
b3Vec3 v1 = in.vertices[i1];
b3Vec3 v2 = in.vertices[i2];
b3Vec3 v = 0.5f * (v1 + v2);
v.Normalize();
smAddVertex(in_out, v.x, v.y, v.z);
smAddVertex(out, v.x, v.y, v.z);
smEdgeVertexPair newPair;
newPair.edge = newEdge;
@ -122,95 +123,103 @@ static inline u32 smSubdivideEdge(smMesh& in_out, smEdgeVertexMap& map,
return newVertex;
}
static void smSubdivideMesh(smMesh& in_out, smEdgeVertexMap& map)
static void smSubdivideMesh(smMesh& out, const smMesh& in, smEdgeVertexMap& map)
{
map.pairCount = 0;
B3_ASSERT(out.vertexCount == 0);
B3_ASSERT(out.indexCount == 0);
B3_ASSERT(map.pairCount == 0);
u32 inputIndexCount = in_out.indexCount;
out.vertexCount = in.vertexCount;
memcpy(out.vertices, in.vertices, in.vertexCount * sizeof(b3Vec3));
for (u32 i = 0; i < inputIndexCount / 3; ++i)
for (u32 i = 0; i < in.indexCount / 3; ++i)
{
u32 vi1 = in_out.indices[3 * i + 0];
u32 vi2 = in_out.indices[3 * i + 1];
u32 vi3 = in_out.indices[3 * i + 2];
u32 vi1 = in.indices[3 * i + 0];
u32 vi2 = in.indices[3 * i + 1];
u32 vi3 = in.indices[3 * i + 2];
u32 vi4 = smSubdivideEdge(in_out, map, vi1, vi2);
u32 vi5 = smSubdivideEdge(in_out, map, vi2, vi3);
u32 vi6 = smSubdivideEdge(in_out, map, vi3, vi1);
u32 vi4 = smSubdivideEdge(out, map, in, vi1, vi2);
u32 vi5 = smSubdivideEdge(out, map, in, vi2, vi3);
u32 vi6 = smSubdivideEdge(out, map, in, vi3, vi1);
smAddTriangle(in_out, vi1, vi4, vi6);
smAddTriangle(in_out, vi4, vi2, vi5);
smAddTriangle(in_out, vi5, vi3, vi6);
smAddTriangle(in_out, vi4, vi5, vi6);
smAddTriangle(out, vi1, vi4, vi6);
smAddTriangle(out, vi4, vi2, vi5);
smAddTriangle(out, vi5, vi3, vi6);
smAddTriangle(out, vi4, vi5, vi6);
}
}
// Compute the maximum number of vertices and
// the number of triangle vertex indices in the intermediate mesh.
// Also compute the maximum number of edge-vertex pairs per subdivision step
static inline void smCount(u32& vertexCount, u32& indexCount, u32& edgeVertexPairCount, u32 subdivisions)
{
vertexCount = 6;
indexCount = 3 * 8;
for (u32 i = 0; i < subdivisions; ++i)
{
vertexCount += 3 * (indexCount / 3);
indexCount += 4 * 3 * (indexCount / 3);
}
edgeVertexPairCount = 3 * (indexCount / 3);
}
void smCreateMesh(smMesh& output, u32 subdivisions)
{
B3_ASSERT(output.vertexCount == 0);
B3_ASSERT(output.indexCount == 0);
u32 vertexCount, indexCount, edgeVertexPairCount;
smCount(vertexCount, indexCount, edgeVertexPairCount, subdivisions);
smMesh in;
in.vertexCount = 0;
in.vertices = (b3Vec3*)b3Alloc(6 * sizeof(b3Vec3));
in.normals = nullptr;
in.indexCount = 0;
in.indices = (u32*)b3Alloc(3 * 8 * sizeof(u32));
u32 byteCount = 0;
byteCount += vertexCount * sizeof(b3Vec3);
byteCount += indexCount * sizeof(u32);
byteCount += edgeVertexPairCount * sizeof(smEdgeVertexPair);
u8* bytes = (u8*)b3Alloc(byteCount);
smMesh out;
out.vertexCount = 0;
out.vertices = (b3Vec3*)bytes;
out.normals = nullptr;
out.indexCount = 0;
out.indices = (u32*) ((u8*)(out.vertices) + (vertexCount * sizeof(b3Vec3)));
smEdgeVertexMap map;
map.pairCount = 0;
map.pairs = (smEdgeVertexPair*) ((u8*)(out.indices) + (indexCount * sizeof(u32)));
smSetAsOctahedron(out);
smSetAsOctahedron(in);
for (u32 i = 0; i < subdivisions; ++i)
{
smSubdivideMesh(out, map);
u32 inTriangleCount = in.indexCount / 3;
u32 outVertexCapacity = in.vertexCount + 3 * inTriangleCount;
u32 outTriangleCapacity = 4 * inTriangleCount;
u32 outIndexCapacity = 3 * outTriangleCapacity;
u32 edgeVertexPairCapacity = 3 * inTriangleCount;
smMesh out;
out.vertexCount = 0;
out.vertices = (b3Vec3*)b3Alloc(outVertexCapacity * sizeof(b3Vec3));
out.indexCount = 0;
out.indices = (u32*)b3Alloc(outIndexCapacity * sizeof(u32));
smEdgeVertexMap map;
map.pairCount = 0;
map.pairs = (smEdgeVertexPair*)b3Alloc(edgeVertexPairCapacity * sizeof(smEdgeVertexPair));
smSubdivideMesh(out, in, map);
b3Free(map.pairs);
b3Free(in.vertices);
b3Free(in.indices);
// in = out
in.vertexCount = out.vertexCount;
in.vertices = (b3Vec3*)b3Alloc(out.vertexCount * sizeof(b3Vec3));
memcpy(in.vertices, out.vertices, out.vertexCount * sizeof(b3Vec3));
in.indexCount = out.indexCount;
in.indices = (u32*)b3Alloc(out.indexCount * sizeof(u32));
memcpy(in.indices, out.indices, out.indexCount * sizeof(u32));
b3Free(out.vertices);
out.vertices = nullptr;
out.normals = nullptr;
b3Free(out.indices);
out.indices = nullptr;
}
B3_ASSERT(out.vertexCount <= vertexCount);
B3_ASSERT(out.indexCount == indexCount);
B3_ASSERT(map.pairCount < edgeVertexPairCount);
output.vertexCount = out.vertexCount;
output.vertices = (b3Vec3*)b3Alloc(out.vertexCount * sizeof(b3Vec3));
memcpy(output.vertices, out.vertices, out.vertexCount * sizeof(b3Vec3));
output.vertexCount = in.vertexCount;
output.vertices = (b3Vec3*)b3Alloc(in.vertexCount * sizeof(b3Vec3));
memcpy(output.vertices, in.vertices, in.vertexCount * sizeof(b3Vec3));
output.normals = (b3Vec3*)b3Alloc(out.vertexCount * sizeof(b3Vec3));
output.normals = (b3Vec3*)b3Alloc(in.vertexCount * sizeof(b3Vec3));
memcpy(output.normals, output.vertices, output.vertexCount * sizeof(b3Vec3));
output.indexCount = out.indexCount;
output.indices = (u32*)b3Alloc(out.indexCount * sizeof(u32));
memcpy(output.indices, out.indices, out.indexCount * sizeof(u32));
output.indexCount = in.indexCount;
output.indices = (u32*)b3Alloc(in.indexCount * sizeof(u32));
memcpy(output.indices, in.indices, in.indexCount * sizeof(u32));
b3Free(bytes);
out.vertices = nullptr;
out.normals = nullptr;
out.indices = nullptr;
b3Free(in.vertices);
b3Free(in.indices);
in.vertices = nullptr;
in.normals = nullptr;
in.indices = nullptr;
}