public override MeshDraw CreateDebugPrimitive(GraphicsDevice device)
{
if (cachedDebugPrimitive != null) return cachedDebugPrimitive;
var verts = new VertexPositionNormalTexture[pointsList.Count];
for (var i = 0; i < pointsList.Count; i++)
{
verts[i].Position = pointsList[i];
verts[i].TextureCoordinate = Vector2.Zero;
verts[i].Normal = Vector3.Zero;
}
var intIndices = indicesList.Select(x => (int)x).ToArray();
////calculate basic normals
////todo verify, winding order might be wrong?
for (var i = 0; i < indicesList.Count; i += 3)
{
var i1 = intIndices[i];
var i2 = intIndices[i + 1];
var i3 = intIndices[i + 2];
var a = verts[i1];
var b = verts[i2];
var c = verts[i3];
var n = Vector3.Cross((b.Position - a.Position), (c.Position - a.Position));
n.Normalize();
verts[i1].Normal = verts[i2].Normal = verts[i3].Normal = n;
}
var meshData = new GeometricMeshData<VertexPositionNormalTexture>(verts, intIndices, false);
cachedDebugPrimitive = new GeometricPrimitive(device, meshData).ToMeshDraw();
return cachedDebugPrimitive;
}
/// <summary>
/// Initializes a new instance of the <see cref="Mesh" /> class.
/// </summary>
/// <param name="meshDraw">The mesh draw.</param>
/// <param name="parameters">The parameters.</param>
/// <exception cref="System.ArgumentNullException">parameters</exception>
public Mesh(MeshDraw meshDraw, ParameterCollection parameters)
{
if (meshDraw == null) throw new ArgumentNullException("meshDraw");
if (parameters == null) throw new ArgumentNullException("parameters");
Draw = meshDraw;
Parameters = parameters;
}
/// <summary>
/// Initializes a new instance of the <see cref="Mesh" /> class.
/// </summary>
/// <param name="meshDraw">The mesh draw.</param>
/// <param name="parameters">The parameters.</param>
/// <exception cref="System.ArgumentNullException">parameters</exception>
public Mesh(MeshDraw meshDraw, ParameterCollection parameters)
{
if (meshDraw == null)
{
throw new ArgumentNullException("meshDraw");
}
if (parameters == null)
{
throw new ArgumentNullException("parameters");
}
Draw = meshDraw;
Parameters = parameters;
}
protected override async Task LoadContent()
{
await base.LoadContent();
var vertices = new Vertex[4];
vertices[0] = new Vertex { Position = new Vector3(-1, -1, 0.5f), TexCoords = new Vector2(0, 0) };
vertices[1] = new Vertex { Position = new Vector3(-1, 1, 0.5f), TexCoords = new Vector2(3, 0) };
vertices[2] = new Vertex { Position = new Vector3(1, 1, 0.5f), TexCoords = new Vector2(3, 3) };
vertices[3] = new Vertex { Position = new Vector3(1, -1, 0.5f), TexCoords = new Vector2(0, 3) };
var indices = new short[] { 0, 1, 2, 0, 2, 3 };
var vertexBuffer = Buffer.Vertex.New(GraphicsDevice, vertices, GraphicsResourceUsage.Default);
var indexBuffer = Buffer.Index.New(GraphicsDevice, indices, GraphicsResourceUsage.Default);
var meshDraw = new MeshDraw
{
DrawCount = 4,
PrimitiveType = PrimitiveType.TriangleList,
VertexBuffers = new[]
{
new VertexBufferBinding(vertexBuffer,
new VertexDeclaration(VertexElement.Position<Vector3>(),
VertexElement.TextureCoordinate<Vector2>()),
4)
},
IndexBuffer = new IndexBufferBinding(indexBuffer, false, indices.Length),
};
var mesh = new Mesh
{
Draw = meshDraw,
};
simpleEffect = new Effect(GraphicsDevice, SpriteEffect.Bytecode);
parameterCollection = new ParameterCollection();
parameterCollectionGroup = new EffectParameterCollectionGroup(GraphicsDevice, simpleEffect, new[] { parameterCollection });
parameterCollection.Set(TexturingKeys.Texture0, UVTexture);
vao = VertexArrayObject.New(GraphicsDevice, mesh.Draw.IndexBuffer, mesh.Draw.VertexBuffers);
myDraws = new DrawOptions[3];
myDraws[0] = new DrawOptions { Sampler = GraphicsDevice.SamplerStates.LinearClamp, Transform = Matrix.Multiply(Matrix.Scaling(0.4f), Matrix.Translation(-0.5f, 0.5f, 0f)) };
myDraws[1] = new DrawOptions { Sampler = GraphicsDevice.SamplerStates.LinearWrap, Transform = Matrix.Multiply(Matrix.Scaling(0.4f), Matrix.Translation(0.5f, 0.5f, 0f)) };
myDraws[2] = new DrawOptions { Sampler = SamplerState.New(GraphicsDevice, new SamplerStateDescription(TextureFilter.Linear, TextureAddressMode.Mirror)), Transform = Matrix.Multiply(Matrix.Scaling(0.4f), Matrix.Translation(0.5f, -0.5f, 0f)) };
//var borderDescription = new SamplerStateDescription(TextureFilter.Linear, TextureAddressMode.Border) { BorderColor = Color.Purple };
//var border = SamplerState.New(GraphicsDevice, borderDescription);
//myDraws[3] = new DrawOptions { Sampler = border, Transform = Matrix.Multiply(Matrix.Scale(0.3f), Matrix.Translation(-0.5f, -0.5f, 0f)) };
}
public override MeshDraw CreateDebugPrimitive(GraphicsDevice device)
{
return cachedDebugPrimitive ?? (cachedDebugPrimitive = GeometricPrimitive.Cube.New(device).ToMeshDraw());
}
/// <summary>
/// Transform a vertex buffer positions, normals, tangents and bitangents using the given matrix.
/// </summary>
/// <param name="meshDrawDatas">The mesh draw datas.</param>
/// <param name="can32BitIndex">A flag stating if 32 bit index buffers.</param>
public unsafe static MeshDraw MergeDrawData(IList<MeshDraw> meshDrawDatas, bool can32BitIndex)
{
if (meshDrawDatas.Count == 0)
throw new ArgumentException("Need at least 1 MeshDrawData.", "meshDrawDatas");
if (meshDrawDatas.Count == 1)
return meshDrawDatas[0];
// Check that vertex buffer declarations are matching
var firstMeshDrawData = meshDrawDatas[0];
if (!firstMeshDrawData.IsSimple())
throw new InvalidOperationException("Can only merge simple MeshDrawData.");
var firstVertexBuffer = firstMeshDrawData.VertexBuffers[0];
var hasIndexBuffer = IsIndexed(meshDrawDatas);
int totalVertexCount = 0;
int totalIndexCount = 0;
//TODO: extend to non-simple vertex declarations, fill with default values it missing declarations etc. ?
for (int i = 0; i < meshDrawDatas.Count; i++)
{
var meshDrawData = meshDrawDatas[i];
// This should not happen anymore
if (i != 0)
{
if (!meshDrawData.IsSimple())
throw new InvalidOperationException("Can only merge simple MeshDrawData.");
if (meshDrawData.VertexBuffers.Length != firstMeshDrawData.VertexBuffers.Length)
throw new InvalidOperationException("Non-matching vertex buffer declarations.");
if (!meshDrawData.VertexBuffers[0].Declaration.Equals(firstMeshDrawData.VertexBuffers[0].Declaration))
throw new InvalidOperationException("Non-matching vertex buffer declarations.");
}
if (meshDrawData.PrimitiveType != PrimitiveType.TriangleList)
throw new InvalidOperationException("Can only merge TriangleList.");
// Update vertex/index counts
totalVertexCount += meshDrawData.VertexBuffers[0].Count;
if (hasIndexBuffer)
{
if (meshDrawData.IndexBuffer != null)
totalIndexCount += meshDrawData.IndexBuffer.Count;
else
totalIndexCount += meshDrawData.VertexBuffers[0].Count;
}
}
// Allocate vertex buffer
var result = new MeshDraw { PrimitiveType = PrimitiveType.TriangleList };
var destBufferData = new byte[firstVertexBuffer.Declaration.VertexStride * totalVertexCount];
result.VertexBuffers = new VertexBufferBinding[] {
new VertexBufferBinding(
new BufferData(BufferFlags.VertexBuffer, destBufferData).ToSerializableVersion(),
firstVertexBuffer.Declaration,
totalVertexCount,
firstVertexBuffer.Stride)};
// Copy vertex buffers
fixed (byte* destBufferDataStart = &destBufferData[0])
{
var destBufferDataCurrent = destBufferDataStart;
foreach (var meshDrawData in meshDrawDatas)
{
var sourceBuffer = meshDrawData.VertexBuffers[0].Buffer.GetSerializationData();
fixed (byte* sourceBufferDataStart = &sourceBuffer.Content[0])
{
Utilities.CopyMemory((IntPtr)destBufferDataCurrent, (IntPtr)sourceBufferDataStart, sourceBuffer.Content.Length);
destBufferDataCurrent += sourceBuffer.Content.Length;
}
}
}
if (hasIndexBuffer)
{
var use32BitIndex = can32BitIndex && totalVertexCount > ushort.MaxValue; // 65535 = 0xFFFF is kept for primitive restart in strip
// Allocate index buffer
destBufferData = new byte[(use32BitIndex ? sizeof(uint) : sizeof(ushort)) * totalIndexCount];
result.IndexBuffer = new IndexBufferBinding(
new BufferData(BufferFlags.IndexBuffer, destBufferData).ToSerializableVersion(),
use32BitIndex,
totalIndexCount);
// Copy index buffers
fixed (byte* destBufferDataStart = &destBufferData[0])
{
var destBufferDataCurrent = destBufferDataStart;
var offset = 0;
foreach (var meshDrawData in meshDrawDatas)
{
var indexBuffer = meshDrawData.IndexBuffer;
byte[] sourceBufferContent = null;
var is32Bit = false;
if (indexBuffer != null)
{
sourceBufferContent = indexBuffer.Buffer.GetSerializationData().Content;
is32Bit = indexBuffer.Is32Bit;
}
if (offset != 0 || (use32BitIndex != meshDrawData.IndexBuffer.Is32Bit))
{
if (use32BitIndex)
sourceBufferContent = CreateIntIndexBuffer(offset, meshDrawData.IndexBuffer.Count, sourceBufferContent, is32Bit);
else
sourceBufferContent = CreateShortIndexBuffer(offset, meshDrawData.IndexBuffer.Count, sourceBufferContent, is32Bit);
}
fixed (byte* sourceBufferDataStart = &sourceBufferContent[0])
{
Utilities.CopyMemory((IntPtr)destBufferDataCurrent, (IntPtr)sourceBufferDataStart,
sourceBufferContent.Length);
destBufferDataCurrent += sourceBufferContent.Length;
}
offset += meshDrawData.VertexBuffers[0].Count;
}
}
result.DrawCount = totalIndexCount;
}
else
{
result.DrawCount = totalVertexCount;
}
return result;
}
public void Generate(IServiceRegistry services, Model model)
{
if (services == null) throw new ArgumentNullException("services");
if (model == null) throw new ArgumentNullException("model");
var graphicsDevice = services.GetSafeServiceAs<IGraphicsDeviceService>().GraphicsDevice;
var data = this.CreatePrimitiveMeshData();
if (data.Vertices.Length == 0)
{
throw new InvalidOperationException("Invalid GeometricPrimitive [{0}]. Expecting non-zero Vertices array");
}
var boundingBox = BoundingBox.Empty;
for (int i = 0; i < data.Vertices.Length; i++)
BoundingBox.Merge(ref boundingBox, ref data.Vertices[i].Position, out boundingBox);
BoundingSphere boundingSphere;
unsafe
{
fixed (void* verticesPtr = data.Vertices)
BoundingSphere.FromPoints((IntPtr)verticesPtr, 0, data.Vertices.Length, VertexPositionNormalTexture.Size, out boundingSphere);
}
var originalLayout = data.Vertices[0].GetLayout();
// Generate Tangent/BiNormal vectors
var resultWithTangentBiNormal = VertexHelper.GenerateTangentBinormal(originalLayout, data.Vertices, data.Indices);
// Generate Multitexcoords
var result = VertexHelper.GenerateMultiTextureCoordinates(resultWithTangentBiNormal);
var meshDraw = new MeshDraw();
var layout = result.Layout;
var vertexBuffer = result.VertexBuffer;
var indices = data.Indices;
if (indices.Length < 0xFFFF)
{
var indicesShort = new ushort[indices.Length];
for (int i = 0; i < indicesShort.Length; i++)
{
indicesShort[i] = (ushort)indices[i];
}
meshDraw.IndexBuffer = new IndexBufferBinding(Buffer.Index.New(graphicsDevice, indicesShort).RecreateWith(indicesShort), false, indices.Length);
}
else
{
if (graphicsDevice.Features.Profile <= GraphicsProfile.Level_9_3)
{
throw new InvalidOperationException("Cannot generate more than 65535 indices on feature level HW <= 9.3");
}
meshDraw.IndexBuffer = new IndexBufferBinding(Buffer.Index.New(graphicsDevice, indices).RecreateWith(indices), true, indices.Length);
}
meshDraw.VertexBuffers = new[] { new VertexBufferBinding(Buffer.New(graphicsDevice, vertexBuffer, BufferFlags.VertexBuffer).RecreateWith(vertexBuffer), layout, data.Vertices.Length) };
meshDraw.DrawCount = indices.Length;
meshDraw.PrimitiveType = PrimitiveType.TriangleList;
var mesh = new Mesh { Draw = meshDraw, BoundingBox = boundingBox, BoundingSphere = boundingSphere };
model.BoundingBox = boundingBox;
model.BoundingSphere = boundingSphere;
model.Add(mesh);
if (MaterialInstance != null && MaterialInstance.Material != null)
{
model.Materials.Add(MaterialInstance);
}
}
/// <summary>
/// Split the mesh if it has strictly more than 65535 vertices (max index = 65534) on a plaftorm that does not support 32 bits indices.
/// </summary>
/// <param name="meshDrawData">The mesh to analyze.</param>
/// <param name="can32bitIndex">A flag stating if 32 bit indices are allowed.</param>
/// <returns>A list of meshes.</returns>
public unsafe static List<MeshDraw> SplitMesh(MeshDraw meshDrawData, bool can32bitIndex)
{
if (meshDrawData.IndexBuffer == null)
return new List<MeshDraw> { meshDrawData };
if (!meshDrawData.IndexBuffer.Is32Bit) // already 16 bits buffer
return new List<MeshDraw> { meshDrawData };
var verticesCount = meshDrawData.VertexBuffers[0].Count;
if (verticesCount <= ushort.MaxValue) // can be put in a 16 bits buffer - 65535 = 0xFFFF is kept for primitive restart in strip
{
meshDrawData.CompactIndexBuffer();
return new List<MeshDraw> { meshDrawData };
}
// now, we only have a 32 bits buffer that is justified because of a large vertex buffer
if (can32bitIndex) // do nothing
return new List<MeshDraw> { meshDrawData };
// TODO: handle primitives other than triangle list
if (meshDrawData.PrimitiveType != PrimitiveType.TriangleList)
return new List<MeshDraw> { meshDrawData };
// Split the mesh
var finalList = new List<MeshDraw>();
fixed (byte* indicesByte = &meshDrawData.IndexBuffer.Buffer.GetSerializationData().Content[0])
{
var indicesUint = (uint*)indicesByte;
var splitInfos = new List<SplitInformation>();
var currentSplit = new SplitInformation();
currentSplit.StartTriangleIndex = 0;
var currentIndexUintPtr = indicesUint;
for (int triangleIndex = 0; triangleIndex < meshDrawData.IndexBuffer.Count / 3; ++triangleIndex)
{
var verticesToAdd = 0;
var index0 = *currentIndexUintPtr++;
var index1 = *currentIndexUintPtr++;
var index2 = *currentIndexUintPtr++;
if (!currentSplit.UsedIndices.Contains(index0)) ++verticesToAdd;
if (!currentSplit.UsedIndices.Contains(index1)) ++verticesToAdd;
if (!currentSplit.UsedIndices.Contains(index2)) ++verticesToAdd;
if (currentSplit.UsedIndices.Count + verticesToAdd > 65535) // append in the same group
{
splitInfos.Add(currentSplit);
currentSplit = new SplitInformation();
currentSplit.StartTriangleIndex = triangleIndex;
}
AddTriangle(currentSplit, index0, index1, index2, triangleIndex);
}
if (currentSplit.UsedIndices.Count > 0)
splitInfos.Add(currentSplit);
foreach (var splitInfo in splitInfos)
{
var triangleCount = splitInfo.LastTriangleIndex - splitInfo.StartTriangleIndex + 1;
var newMeshDrawData = new MeshDraw
{
PrimitiveType = PrimitiveType.TriangleList,
DrawCount = 3 * triangleCount,
VertexBuffers = new VertexBufferBinding[meshDrawData.VertexBuffers.Length]
};
// vertex buffers
for (int vbIndex = 0; vbIndex < meshDrawData.VertexBuffers.Length; ++ vbIndex)
{
var stride = meshDrawData.VertexBuffers[vbIndex].Stride;
if (stride == 0)
stride = meshDrawData.VertexBuffers[vbIndex].Declaration.VertexStride;
var newVertexBuffer = new byte[splitInfo.UsedIndices.Count * stride];
fixed (byte* vertexBufferPtr = &meshDrawData.VertexBuffers[vbIndex].Buffer.GetSerializationData().Content[0])
fixed (byte* newVertexBufferPtr = &newVertexBuffer[vbIndex])
{
//copy vertex buffer
foreach (var index in splitInfo.UsedIndices)
Utilities.CopyMemory((IntPtr)(newVertexBufferPtr + stride * splitInfo.IndexRemapping[index]), (IntPtr)(vertexBufferPtr + stride * index), stride);
}
newMeshDrawData.VertexBuffers[vbIndex] = new VertexBufferBinding(
new BufferData(BufferFlags.VertexBuffer, newVertexBuffer).ToSerializableVersion(),
meshDrawData.VertexBuffers[vbIndex].Declaration,
splitInfo.UsedIndices.Count);
}
// index buffer
var newIndexBuffer = new byte[sizeof(ushort) * 3 * triangleCount];
fixed (byte* newIndexBufferPtr = &newIndexBuffer[0])
{
var newIndexBufferUshortPtr = (ushort*)newIndexBufferPtr;
var currentIndexPtr = &indicesUint[3 * splitInfo.StartTriangleIndex];
for (int triangleIndex = 0; triangleIndex < triangleCount; ++triangleIndex)
{
var index0 = *currentIndexPtr++;
var index1 = *currentIndexPtr++;
var index2 = *currentIndexPtr++;
var newIndex0 = splitInfo.IndexRemapping[index0];
var newIndex1 = splitInfo.IndexRemapping[index1];
var newIndex2 = splitInfo.IndexRemapping[index2];
*newIndexBufferUshortPtr++ = newIndex0;
*newIndexBufferUshortPtr++ = newIndex1;
*newIndexBufferUshortPtr++ = newIndex2;
}
}
newMeshDrawData.IndexBuffer = new IndexBufferBinding(
new BufferData(BufferFlags.IndexBuffer, newIndexBuffer).ToSerializableVersion(),
false,
triangleCount*3);
finalList.Add(newMeshDrawData);
}
}
return finalList;
}
