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meshoptimizer: Update to 0.24

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This commit is contained in:
Jakub Marcowski
2025-06-27 01:02:34 +02:00
parent 9a3976097f
commit 893f5b37f4
14 changed files with 1327 additions and 435 deletions
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28
thirdparty/meshoptimizer/indexcodec.cpp vendored
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@@ -210,6 +210,7 @@ size_t meshopt_encodeIndexBuffer(unsigned char* buffer, size_t buffer_size, cons
if (fer >= 0 && (fer >> 2) < 15)
{
// note: getEdgeFifo implicitly rotates triangles by matching a/b to existing edge
const unsigned int* order = kTriangleIndexOrder[fer & 3];
unsigned int a = indices[i + order[0]], b = indices[i + order[1]], c = indices[i + order[2]];
@@ -267,6 +268,7 @@ size_t meshopt_encodeIndexBuffer(unsigned char* buffer, size_t buffer_size, cons
int fc = getVertexFifo(vertexfifo, c, vertexfifooffset);
// after rotation, a is almost always equal to next, so we don't waste bits on FIFO encoding for a
// note: decoder implicitly assumes that if feb=fec=0, then fea=0 (reset code); this is enforced by rotation
int fea = (a == next) ? (next++, 0) : 15;
int feb = (fb >= 0 && fb < 14) ? fb + 1 : (b == next ? (next++, 0) : 15);
int fec = (fc >= 0 && fc < 14) ? fc + 1 : (c == next ? (next++, 0) : 15);
@@ -433,6 +435,7 @@ int meshopt_decodeIndexBuffer(void* destination, size_t index_count, size_t inde
// fifo reads are wrapped around 16 entry buffer
unsigned int a = edgefifo[(edgefifooffset - 1 - fe) & 15][0];
unsigned int b = edgefifo[(edgefifooffset - 1 - fe) & 15][1];
unsigned int c = 0;
int fec = codetri & 15;
@@ -442,37 +445,30 @@ int meshopt_decodeIndexBuffer(void* destination, size_t index_count, size_t inde
{
// fifo reads are wrapped around 16 entry buffer
unsigned int cf = vertexfifo[(vertexfifooffset - 1 - fec) & 15];
unsigned int c = (fec == 0) ? next : cf;
c = (fec == 0) ? next : cf;
int fec0 = fec == 0;
next += fec0;
// output triangle
writeTriangle(destination, i, index_size, a, b, c);
// push vertex/edge fifo must match the encoding step *exactly* otherwise the data will not be decoded correctly
// push vertex fifo must match the encoding step *exactly* otherwise the data will not be decoded correctly
pushVertexFifo(vertexfifo, c, vertexfifooffset, fec0);
pushEdgeFifo(edgefifo, c, b, edgefifooffset);
pushEdgeFifo(edgefifo, a, c, edgefifooffset);
}
else
{
unsigned int c = 0;
// fec - (fec ^ 3) decodes 13, 14 into -1, 1
// note that we need to update the last index since free indices are delta-encoded
last = c = (fec != 15) ? last + (fec - (fec ^ 3)) : decodeIndex(data, last);
// output triangle
writeTriangle(destination, i, index_size, a, b, c);
// push vertex/edge fifo must match the encoding step *exactly* otherwise the data will not be decoded correctly
pushVertexFifo(vertexfifo, c, vertexfifooffset);
pushEdgeFifo(edgefifo, c, b, edgefifooffset);
pushEdgeFifo(edgefifo, a, c, edgefifooffset);
}
// push edge fifo must match the encoding step *exactly* otherwise the data will not be decoded correctly
pushEdgeFifo(edgefifo, c, b, edgefifooffset);
pushEdgeFifo(edgefifo, a, c, edgefifooffset);
// output triangle
writeTriangle(destination, i, index_size, a, b, c);
}
else
{