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[+] glTF import/export. Support for Open3DGC-compression of mesh primitives.

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This commit is contained in:
Alexandr Arutjunov
2016-08-11 01:04:30 +03:00
parent 0dcf4dcd16
commit 0ad2f2247a
5 changed files with 427 additions and 339 deletions
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46
code/glTFImporter.cpp
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@@ -259,7 +259,36 @@ void glTFImporter::ImportMeshes(glTF::Asset& r)
for (unsigned int m = 0; m < r.meshes.Size(); ++m) {
Mesh& mesh = r.meshes[m];
meshOffsets.push_back(k);
// Check if mesh extensions is used
if(mesh.Extension.size() > 0)
{
for(Mesh::SExtension* cur_ext : mesh.Extension)
{
if(cur_ext->Type == Mesh::SExtension::EType::Compression_Open3DGC)
{
// Limitations for meshes when using Open3DGC-compression.
// It's a current limitation of sp... Specification have not this part still - about mesh compression. Why only one primitive?
// Because glTF is very flexibly. But in fact it ugly flexible. Every primitive can has own set of accessors and accessors can
// point to a-a-a-a-any part of buffer (thru bufferview ofcourse) and even to another buffer. We know that "Open3DGC-compression"
// is applicable only to part of buffer. As we can't guaranty continuity of the data for decoder, we will limit quantity of primitives.
// Yes indices, coordinates etc. still can br stored in different buffers, but with current specification it's a exporter problem.
// Also primitive can has only one of "POSITION", "NORMAL" and less then "AI_MAX_NUMBER_OF_TEXTURECOORDS" of "TEXCOORD". All accessor
// of primitive must point to one continuous region of the buffer.
if(mesh.primitives.size() > 2) throw DeadlyImportError("GLTF: When using Open3DGC compression then only one primitive per mesh are allowed.");
Mesh::SCompression_Open3DGC* o3dgc_ext = (Mesh::SCompression_Open3DGC*)cur_ext;
Ref<Buffer> buf = r.buffers.Get(o3dgc_ext->Buffer);
buf->EncodedRegion_SetCurrent(mesh.id);
}
else
{
throw DeadlyImportError("GLTF: Can not import mesh: unknown mesh extension, only Open3DGC is supported.");
}
}
}// if(mesh.Extension.size() > 0)
meshOffsets.push_back(k);
k += unsigned(mesh.primitives.size());
for (unsigned int p = 0; p < mesh.primitives.size(); ++p) {
@@ -295,25 +324,13 @@ void glTFImporter::ImportMeshes(glTF::Asset& r)
Mesh::Primitive::Attributes& attr = prim.attributes;
// if "bufferView" of current accessor is containing encoded data then set ID of region.
if(attr.position[0]->bufferView->EncodedRegion_List.size() > 0) attr.position[0]->bufferView->EncodedRegion_SetCurrent(mesh.name);
if (attr.position.size() > 0 && attr.position[0]) {
aim->mNumVertices = attr.position[0]->count;
attr.position[0]->ExtractData(aim->mVertices);
}
// if "bufferView" of current accessor is containing encoded data then set ID of region.
if(attr.normal[0]->bufferView->EncodedRegion_List.size() > 0) attr.normal[0]->bufferView->EncodedRegion_SetCurrent(mesh.name);
if (attr.normal.size() > 0 && attr.normal[0]) attr.normal[0]->ExtractData(aim->mNormals);
// if "bufferView" of current accessor is containing encoded data then set ID of region.
if((attr.texcoord.size() > 0) && (attr.texcoord[0]->bufferView->EncodedRegion_List.size() > 0))
{
attr.texcoord[0]->bufferView->EncodedRegion_SetCurrent(mesh.name);
}
for (size_t tc = 0; tc < attr.texcoord.size() && tc <= AI_MAX_NUMBER_OF_TEXTURECOORDS; ++tc) {
attr.texcoord[tc]->ExtractData(aim->mTextureCoords[tc]);
aim->mNumUVComponents[tc] = attr.texcoord[tc]->GetNumComponents();
@@ -326,9 +343,6 @@ void glTFImporter::ImportMeshes(glTF::Asset& r)
if (prim.indices) {
// if "bufferView" of current accessor is containing encoded data then set ID of region.
if(prim.indices->bufferView->EncodedRegion_List.size() > 0) prim.indices->bufferView->EncodedRegion_SetCurrent(mesh.name);
aiFace* faces = 0;
unsigned int nFaces = 0;