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Give each accessor its own buffer view to improve the memory and rendering efficiency of the glb file

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Chetan
2023-08-25 09:45:30 +08:00
committed by Thomas Krijnen
parent ad420108b0
commit 55a623dc97
1 changed files with 19 additions and 4 deletions
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src/serializers/GltfSerializer.cpp
+19 -4
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@@ -121,17 +121,28 @@ const uint32_t component_type<int>::value = CT_UNSIGNED_INT;
template <>
const uint32_t component_type<float>::value = CT_FLOAT;
static int bufferViewId = 0;
template <size_t N, typename It>
size_t write_accessor(json& j, std::ofstream& ofs, It begin, It end) {
auto num = std::distance(begin, end) / N;
json accessor = json::object();
accessor["bufferView"] = N == 1 ? 0 : 1;
accessor["byteOffset"] = (size_t)ofs.tellp();
accessor["bufferView"] = bufferViewId;
accessor["byteOffset"] = 0;
accessor["componentType"] = component_type<typename It::value_type>::value;
accessor["count"] = num;
if (N == 1) {
j["bufferViews"].push_back({ {"buffer", 0}, {"byteOffset", (size_t)ofs.tellp()}, { "byteLength", num * 4}, {"target", 34963} });
}
else {
j["bufferViews"].push_back({ {"buffer", 0}, {"byteStride", 12}, { "byteOffset", (size_t)ofs.tellp()}, { "byteLength", num * 12}, {"target", 34962}});
}
bufferViewId++;
std::array<typename It::value_type, N> min, max;
min.fill(std::numeric_limits<typename It::value_type>::max());
max.fill(std::numeric_limits<typename It::value_type>::lowest());
@@ -325,8 +336,12 @@ void GltfSerializer::finalize() {
json scene_0;
scene_0["nodes"] = node_array_;
json_["scenes"].push_back(scene_0);
json_["bufferViews"].push_back({ {"buffer", 0}, { "byteLength", indices_length } });
json_["bufferViews"].push_back({ {"buffer", 0}, {"byteStride", 12}, { "byteOffset", indices_length }, { "byteLength", binary_length - indices_length } });
for (auto &n : json_["bufferViews"]) {
if (n.contains("byteStride"))
n["byteOffset"] = (int)n["byteOffset"] + indices_length;
}
json_["buffers"].push_back({ {"byteLength", binary_length} });
std::string json_contents = json_.dump();