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Fileformat & filesystem API W.I.P.

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This commit is contained in:
Syoyo Fujita
2023-09-21 07:29:03 +09:00
parent 199d6f4166
commit d000dd5107
3 changed files with 131 additions and 39 deletions
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103
examples/file_format/file-format-example.cc
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@@ -14,37 +14,100 @@
std::map<std::string, float> g_map;
//
// We provide two APIs
//
// - File system API(for AssetResolution::openAsset)
// - Create on-memory file(data)
// - File format API(read/write data with custom format)
// File system APIs
static int MyFSizeData(const char *asset_name, uint64_t *nbytes, std::string *err, void *userdata) {
(void)userdata;
if (!asset_name) {
if (err) {
(*err) += "asset_name arg is nullptr.\n";
}
return -1;
}
if (!nbytes) {
if (err) {
(*err) += "nbytes arg is nullptr.\n";
}
return -1;
}
(*nbytes) = sizeof(float);
return 0; // OK
}
int MyFSReadData(const char *asset_name, uint64_t req_nbytes, uint8_t *out_buf,
uint64_t *nbytes, std::string *err, void *userdata) {
if (!asset_name) {
if (err) {
(*err) += "asset_name arg is nullptr.\n";
}
return -3;
}
if (!nbytes) {
if (err) {
(*err) += "nbytes arg is nullptr.\n";
}
return -3;
}
if (req_nbytes < sizeof(float)) {
return -2;
}
if (g_map.count(asset_name)) {
float val = g_map[asset_name];
memcpy(out_buf, &val, sizeof(float));
(*nbytes) = sizeof(float);
return 0;
}
//
return -1;
}
//
// custom File-format APIs.
//
static bool MyCheck(const tinyusdz::AssetInfo &asset, std::string *warn, std::string *err, void *user_data) {
static bool MyCheck(const uint8_t *addr, const size_t nbytes, std::string *warn, std::string *err, void *user_data) {
return true;
}
static bool MyRead(const tinyusdz::AssetInfo &asset, tinyusdz::PrimSpec &ps/* inout */, std::string *warn, std::string *err, void *user_data) {
std::string key = asset.identifier.GetAssetPath();
static bool MyRead(const uint8_t *addr, const size_t nbytes, tinyusdz::PrimSpec &ps/* inout */, std::string *warn, std::string *err, void *user_data) {
if (g_map.count(key)) {
float val = g_map[key];
tinyusdz::Attribute attr;
attr.set_value(val);
attr.set_name("myval");
attr.variability() = tinyusdz::Variability::Uniform;
ps.props()["myval"] = tinyusdz::Property(attr, /* custom */false);
return true;
} else {
if (err) {
(*err) += "`" + key + "` not found.\n";
}
if (!addr) {
return false;
}
if (nbytes != 4) {
return false;
}
float val;
memcpy(&val, addr, 4);
tinyusdz::Attribute attr;
attr.set_value(val);
attr.set_name("myval");
attr.variability() = tinyusdz::Variability::Uniform;
ps.props()["myval"] = tinyusdz::Property(attr, /* custom */false);
return true;
}
static bool MyWrite(const tinyusdz::AssetInfo &asset, const tinyusdz::PrimSpec &ps, std::string *err, void *user_data) {
static bool MyWrite(const tinyusdz::PrimSpec &ps, std::vector<uint8_t> *data_out, std::string *warn, std::string *err, void *user_data) {
// TOOD
return false;
}