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Parse sparse accessors

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This commit is contained in:
Arthur Brainville (Ybalrid) 2019-03-06 12:27:23 +00:00
parent 9d86405d3d
commit 7e9f734d73
1 changed files with 55 additions and 2 deletions
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55
tiny_gltf.h
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@ -581,7 +581,7 @@ struct Accessor {
struct {
int byteOffset;
int bufferView;
int component_type; // a TINYGLTF_COMPONENT_TYPE_ value
int componentType; // a TINYGLTF_COMPONENT_TYPE_ value
} indices;
struct {
int bufferView;
@ -2816,6 +2816,51 @@ static bool ParseBufferView(BufferView *bufferView, std::string *err,
bufferView->byteOffset = static_cast<size_t>(byteOffset);
bufferView->byteLength = static_cast<size_t>(byteLength);
bufferView->byteStride = static_cast<size_t>(byteStride);
return true;
}
static bool ParseSparseAccessor(Accessor* accessor, std::string* err, const json &o)
{
accessor->sparse.isSparse = true;
double count = 0.0;
ParseNumberProperty(&count, err, o, "count", true);
const auto indices_iterator = o.find("indices");
const auto values_iterator = o.find("values");
if(indices_iterator == o.end())
{
(*err) = "the sparse object of this accessor doesn't have indices";
return false;
}
if(values_iterator == o.end())
{
(*err) = "the sparse object ob ths accessor doesn't have values";
return false;
}
const json& indices_obj = *indices_iterator;
const json& values_obj = *values_iterator;
double indices_buffer_view = 0.0, indices_byte_offset = 0.0, component_type = 0.0;
ParseNumberProperty(&indices_buffer_view, err, indices_obj, "bufferView", true);
ParseNumberProperty(&indices_byte_offset, err, indices_obj, "byteOffset", true);
ParseNumberProperty(&component_type, err, indices_obj, "componentType", true);
double values_buffer_view = 0.0, values_byte_offset = 0.0;
ParseNumberProperty(&values_buffer_view, err, values_obj, "bufferView", true);
ParseNumberProperty(&values_byte_offset, err, values_obj, "byteOffset", true);
accessor->sparse.count = static_cast<int>(count);
accessor->sparse.indices.bufferView = static_cast<int>(indices_buffer_view);
accessor->sparse.indices.byteOffset = static_cast<int>(indices_byte_offset);
accessor->sparse.indices.componentType = static_cast<int>(component_type);
accessor->sparse.values.bufferView = static_cast<int>(values_buffer_view);
accessor->sparse.values.byteOffset = static_cast<int>(values_byte_offset);
//todo check theses values
return true;
}
@ -2901,6 +2946,14 @@ static bool ParseAccessor(Accessor *accessor, std::string *err, const json &o) {
ParseExtrasProperty(&(accessor->extras), o);
//check if accessor has a "sparse" object:
const auto iterator = o.find("sparse");
if(iterator != o.end())
{
//here this accessor has a "sparse" subobject
return ParseSparseAccessor(accessor, err, *iterator);
}
return true;
}