std::tuple<Mesh, std::unique_ptr<Buffer>, std::unique_ptr<Buffer>> compile(const Trade::MeshData2D& meshData, const BufferUsage usage) {
Mesh mesh;
mesh.setPrimitive(meshData.primitive());
/* Decide about stride and offsets */
UnsignedInt stride = sizeof(Shaders::Generic2D::Position::Type);
const UnsignedInt normalOffset = sizeof(Shaders::Generic2D::Position::Type);
if(meshData.hasTextureCoords2D())
stride += sizeof(Shaders::Generic2D::TextureCoordinates::Type);
/* Create vertex buffer */
std::unique_ptr<Buffer> vertexBuffer{new Buffer{Buffer::TargetHint::Array}};
/* Interleave positions */
Containers::Array<char> data = MeshTools::interleave(
meshData.positions(0),
stride - sizeof(Shaders::Generic2D::Position::Type));
mesh.addVertexBuffer(*vertexBuffer, 0,
Shaders::Generic2D::Position(),
stride - sizeof(Shaders::Generic2D::Position::Type));
/* Add also texture coordinates, if present */
if(meshData.hasTextureCoords2D()) {
MeshTools::interleaveInto(data,
normalOffset,
meshData.textureCoords2D(0),
stride - normalOffset - sizeof(Shaders::Generic2D::TextureCoordinates::Type));
mesh.addVertexBuffer(*vertexBuffer, 0,
normalOffset,
Shaders::Generic2D::TextureCoordinates(),
stride - normalOffset - sizeof(Shaders::Generic2D::TextureCoordinates::Type));
}
/* Fill vertex buffer with interleaved data */
vertexBuffer->setData(data, usage);
/* If indexed, fill index buffer and configure indexed mesh */
std::unique_ptr<Buffer> indexBuffer;
if(meshData.isIndexed()) {
Containers::Array<char> indexData;
Mesh::IndexType indexType;
UnsignedInt indexStart, indexEnd;
std::tie(indexData, indexType, indexStart, indexEnd) = MeshTools::compressIndices(meshData.indices());
indexBuffer.reset(new Buffer{Buffer::TargetHint::ElementArray});
indexBuffer->setData(indexData, usage);
mesh.setCount(meshData.indices().size())
.setIndexBuffer(*indexBuffer, 0, indexType, indexStart, indexEnd);
/* Else set vertex count */
} else mesh.setCount(meshData.positions(0).size());
return std::make_tuple(std::move(mesh), std::move(vertexBuffer), std::move(indexBuffer));
}
