private Mesh TransformMesh(WriterContext context, IMesh meshAsset, IList <IMaterialAsset> materials)
{
var gpuMesh = meshAsset.ToGpuMesh();
var mesh = context.ModelRoot.CreateMesh(meshAsset.Id);
context.Meshes.Add(meshAsset, mesh);
var memoryStream = new MemoryStream(4096);
var bufferViewMap = new Dictionary <IBufferView, BufferVeiwData>();
using (var binaryWriter = new BinaryWriter(memoryStream))
{
foreach (var bufferView in gpuMesh.BufferViews)
{
var bufferViewContext = new BufferVeiwData();
bufferViewMap[bufferView] = bufferViewContext;
bufferViewContext.BufferByteOffset = (int)memoryStream.Position;
foreach (var streamKey in bufferView.GetStreams())
{
var stream = bufferView.GetStream(streamKey);
var accessorData = new AccessorData();
accessorData.Key = streamKey;
accessorData.AttributeKey = GetAttributeKey(streamKey);
accessorData.Source = GetSource(accessorData.Key, stream);
accessorData.Dimentions = GetDimensionType(stream.MetaInfo);
accessorData.Encoding = accessorData.Source.Encoding;
accessorData.Normalized = false;
accessorData.ItemCount = stream.Count;
if (bufferViewContext.ItemCount != 0 && bufferViewContext.ItemCount != stream.Count)
{
throw new InvalidOperationException(
"Number of elements in stream should be constant for all streams in gpu buffer");
}
bufferViewContext.ItemCount = stream.Count;
accessorData.BufferByteOffset = bufferViewContext.Stride;
bufferViewContext.Stride += accessorData.Source.ElementSizeInBytes;
bufferViewContext.Accessors.Add(accessorData);
}
for (var i = 0; i < bufferViewContext.ItemCount; ++i)
{
foreach (var accessorData in bufferViewContext.Accessors)
{
accessorData.Source.WriteNext(binaryWriter);
}
}
}
}
var buffer = mesh.LogicalParent.UseBuffer(memoryStream.ToArray());
foreach (var bufferVeiwData in bufferViewMap.Values)
{
var bufferView = mesh.LogicalParent.UseBufferView(buffer, bufferVeiwData.BufferByteOffset, null,
bufferVeiwData.Stride,
BufferMode.ARRAY_BUFFER);
foreach (var data in bufferVeiwData.Accessors)
{
var accessor = mesh.LogicalParent.CreateAccessor();
accessor.SetVertexData(bufferView, data.BufferByteOffset, data.ItemCount, data.Dimentions,
data.Encoding, data.Normalized);
data.MemoryAccessor = accessor;
}
}
for (var primitiveIndex = 0; primitiveIndex < gpuMesh.Primitives.Count; primitiveIndex++)
{
var gpuPrimitive = gpuMesh.Primitives[primitiveIndex];
var bufView = bufferViewMap[gpuPrimitive.BufferView];
var primitive = mesh.CreatePrimitive();
primitive.WithMaterial(context.Materials[materials[primitiveIndex % materials.Count]]);
foreach (var accessor in bufView.Accessors)
{
primitive.SetVertexAccessor(accessor.AttributeKey, accessor.MemoryAccessor);
}
primitive.WithIndicesAccessor(GetPrimitiveType(gpuPrimitive.Topology), gpuPrimitive);
}
return(mesh);
}
private Mesh TransformMesh(WriterContext context, IMesh meshAsset)
{
return(TransformMesh(context, meshAsset, context.MeshInstances[meshAsset]));
}
private static bool TrySetupTexture(Material material, string key, SamplerParameters?samplerParameter, WriterContext context)
{
if (samplerParameter != null && samplerParameter.Value.Image != null)
{
material.WithChannelTexture(key, samplerParameter.Value.TextureCoordinate, context.Textures[samplerParameter.Value.Image]);
return(true);
}
return(false);
}
private void SetupMetallicRoughnessShader(Material material, MetallicRoughnessShader shader, WriterContext context)
{
material = material.WithPBRMetallicRoughness();
SetupDefaultShader(material, shader, context);
TrySetupTexture(material, "BaseColor", shader.BaseColorTexture, context);
material.WithChannelParameter("BaseColor", shader.BaseColorFactor);
TrySetupTexture(material, "MetallicRoughness", shader.MetallicRoughnessTexture, context);
material.WithChannelParameter("MetallicRoughness", new Vector4(shader.MetallicFactor, shader.RoughnessFactor, 0, 0));
}
private void SetupSpecularGlossinessShader(Material material, SpecularGlossinessShader shader, WriterContext context)
{
material = material.WithPBRSpecularGlossiness();
SetupDefaultShader(material, shader, context);
TrySetupTexture(material, "Diffuse", shader.DiffuseTexture, context);
material.WithChannelParameter("Diffuse", shader.DiffuseFactor);
TrySetupTexture(material, "SpecularGlossiness", shader.SpecularGlossinessTexture, context);
material.WithChannelParameter("SpecularGlossiness", new Vector4(shader.SpecularFactor, shader.GlossinessFactor));
}
public Task WriteAsync(Stream stream, IContentContainer content)
{
return(Task.Run(async() =>
{
var context = new WriterContext
{
Container = content,
ModelRoot = ModelRoot.CreateModel()
};
foreach (var textureAsset in content.Images)
{
var image = context.ModelRoot.CreateImage(textureAsset.Id);
image.SetSatelliteContent((await textureAsset.GetContentAsync()).ToArray());
context.Textures.Add(textureAsset, image);
}
foreach (var materialAsset in content.Materials)
{
var material = context.ModelRoot.CreateMaterial(materialAsset.Id);
material.AlphaCutoff = materialAsset.AlphaCutoff;
material.Alpha = GetAlphaMode(materialAsset.Alpha);
material.DoubleSided = materialAsset.DoubleSided;
if (materialAsset.Unlit)
{
material = material.WithUnlit();
}
var metallicRoughnessShader = materialAsset.Shader as MetallicRoughnessShader;
if (metallicRoughnessShader != null)
{
SetupMetallicRoughnessShader(material, metallicRoughnessShader, context);
}
else
{
var specularGlossinessShader = materialAsset.Shader as SpecularGlossinessShader;
if (specularGlossinessShader != null)
{
SetupSpecularGlossinessShader(material, specularGlossinessShader, context);
}
else
{
material.WithDefault();
var defaultShader = materialAsset.Shader as ShaderAsset;
if (defaultShader != null)
{
SetupDefaultShader(material, defaultShader, context);
}
}
}
context.Materials.Add(materialAsset, material);
}
foreach (var nodeAsset in GetAllNodes(content))
{
if (nodeAsset.Mesh != null)
{
IList <IMaterialAsset> materials;
if (context.MeshInstances.TryGetValue(nodeAsset.Mesh.Mesh, out materials))
{
if (materials.Count != nodeAsset.Mesh.Materials.Count)
{
throw new FormatException("Mesh materials doesn't match all mesh instances");
}
if (!materials.Zip(nodeAsset.Mesh.Materials, (a, b) => a == b).All(_ => _))
{
throw new FormatException("Mesh materials doesn't match all mesh instances");
}
continue;
}
context.MeshInstances.Add(nodeAsset.Mesh.Mesh, nodeAsset.Mesh.Materials);
}
}
foreach (var meshAsset in content.Meshes)
{
TransformMesh(context, meshAsset);
}
foreach (var sceneAsset in content.Scenes)
{
var scene = context.ModelRoot.UseScene(sceneAsset.Id);
if (context.ModelRoot.DefaultScene == null)
{
context.ModelRoot.DefaultScene = scene;
}
foreach (var nodeAsset in sceneAsset.ChildNodes)
{
TransformNode(context, nodeAsset, scene.CreateNode(nodeAsset.Id));
}
}
context.ModelRoot.WriteGLB(stream);
}));
}