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spec: Add connectivity_method == 0 to Sequential decoder

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This addresses a comment in KhronosGroup/glTF#1114
This commit is contained in:
Frank Galligan 2017-10-07 11:54:34 -07:00
parent 71d0b9abe2
commit d164943ee2
1 changed files with 39 additions and 3 deletions
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42
docs/spec/sequential.decoder.md
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@ -55,11 +55,10 @@ void ParseSequentialIndicesUI32() {
{:.draco-syntax } {:.draco-syntax }
### DecodeSequentialConnectivityData() ### DecodeSequentialIndices()
~~~~~ ~~~~~
void DecodeSequentialConnectivityData() { void DecodeSequentialIndices() {
ParseSequentialConnectivityData();
if (num_points < 256) { if (num_points < 256) {
ParseSequentialIndicesUI8(); ParseSequentialIndicesUI8();
} else if (num_points < (1 << 16)) { } else if (num_points < (1 << 16)) {
@ -70,3 +69,40 @@ void DecodeSequentialConnectivityData() {
} }
~~~~~ ~~~~~
{:.draco-syntax } {:.draco-syntax }
### DecodeSequentialCompressedIndices()
~~~~~
void DecodeSequentialCompressedIndices() {
DecodeSymbols(num_faces * 3, 1, &decoded_symbols);
last_index_value = 0;
for (i = 0; i < num_faces; ++i) {
for (j = 0; j < 3; ++j) {
encoded_val = decoded_symbols[i * 3 + j];
index_diff = (encoded_val >> 1);
if (encoded_val & 1)
index_diff = -index_diff;
val = index_diff + last_index_value;
face_to_vertex[j][i] = val;
last_index_value = val;
}
}
}
~~~~~
{:.draco-syntax }
### DecodeSequentialConnectivityData()
~~~~~
void DecodeSequentialConnectivityData() {
ParseSequentialConnectivityData();
if (connectivity_method == 0) {
DecodeSequentialCompressedIndices();
} else if (connectivity_method == 1) {
DecodeSequentialIndices();
}
}
~~~~~
{:.draco-syntax }