private static IExplicitModel BuildWallModel(List <BuildingWallSegment> wallSegments)
{
var vertices = new VertexPosTanNormTex[wallSegments.Count * 4];
var indices = new int[wallSegments.Count * 6];
for (int i = 0; i < wallSegments.Count; i++)
{
var segment = wallSegments[i].Basement;
var height = wallSegments[i].Height;
var vertexOffset = i * 4;
var indexOffset = i * 6;
var tangent = (segment.Point2 - segment.Point1).Normalize();
var normal = Vector3.Cross(tangent, Vector3.UnitY).Normalize();
var texCoordWidth = Math.Max((float)Math.Round(segment.Length / 2), 1f);
var texCoordHeight = Math.Max((float)Math.Round(height / 2), 1f);
vertices[vertexOffset + 0] = new VertexPosTanNormTex(segment.Point1, tangent, normal, new Vector2(0, texCoordHeight));
vertices[vertexOffset + 1] = new VertexPosTanNormTex(segment.Point1 + height * Vector3.UnitY, tangent, normal, new Vector2(0, 0));
vertices[vertexOffset + 2] = new VertexPosTanNormTex(segment.Point2 + height * Vector3.UnitY, tangent, normal, new Vector2(texCoordWidth, 0));
vertices[vertexOffset + 3] = new VertexPosTanNormTex(segment.Point2, tangent, normal, new Vector2(texCoordWidth, texCoordHeight));
indices[indexOffset + 0] = vertexOffset;
indices[indexOffset + 1] = vertexOffset + 1;
indices[indexOffset + 2] = vertexOffset + 2;
indices[indexOffset + 3] = vertexOffset;
indices[indexOffset + 4] = vertexOffset + 2;
indices[indexOffset + 5] = vertexOffset + 3;
}
return(ExplicitModel.FromVertices(vertices, indices, ExplicitModelPrimitiveTopology.TriangleList));
}
public override IResource GetNew(IResourceSource resourceSource)
{
var cSource = (Source)resourceSource;
var verticalIndexOffset = 2 * cSource.HalfNumCircleSegments;
var vertices = new VertexPosTanNormTex[verticalIndexOffset * cSource.HalfNumCircleSegments];
for (int i = 0; i < cSource.HalfNumCircleSegments; i++)
{
for (int j = 0; j < verticalIndexOffset; j++)
{
var u = (float)j / (verticalIndexOffset - 1);
var v = (float)i / (cSource.HalfNumCircleSegments - 1);
var phi = MathHelper.TwoPi * u + MathHelper.Pi;
var psi = MathHelper.PiOver2 - MathHelper.Pi * v;
var z = MathHelper.Cos(phi) * MathHelper.Cos(psi);
var x = MathHelper.Sin(phi) * MathHelper.Cos(psi);
var y = MathHelper.Sin(psi);
var normal = new Vector3(x, y, z);
var position = normal;
var tangent = Vector3.Cross(Vector3.UnitY, normal).Normalize();
var texcoord = new Vector2(u, v);
vertices[i * verticalIndexOffset + j] = new VertexPosTanNormTex(
position, tangent, normal, texcoord);
}
}
var indexList = new List <int>();
for (int i = 0; i < cSource.HalfNumCircleSegments - 1; i++)
{
for (int j = 0; j < verticalIndexOffset - 1; j++)
{
var topLeftIndex = i * verticalIndexOffset + j;
indexList.Add(topLeftIndex);
indexList.Add(topLeftIndex + 1);
indexList.Add(topLeftIndex + 1 + verticalIndexOffset);
indexList.Add(topLeftIndex);
indexList.Add(topLeftIndex + 1 + verticalIndexOffset);
indexList.Add(topLeftIndex + verticalIndexOffset);
}
}
var indices = indexList.ToArray();
if (cSource.Inverse)
{
for (int i = 0; i < vertices.Length; i++)
{
vertices[i].Normal = -vertices[i].Normal;
}
for (int i = 0; i < indices.Length; i += 3)
{
CodingHelper.Swap(ref indices[i + 1], ref indices[i + 2]);
}
}
return(ExplicitModel.FromVertices(vertices, indices, ExplicitModelPrimitiveTopology.TriangleList).WithSource(cSource));
}
public unsafe GlObjects GetGlObjects()
{
if (!dirty)
{
return(glObjects);
}
if (glObjects.Vao == null)
{
glObjects.Vao = infra.GlContext.Create.VertexArray();
}
glObjects.Vao.DisableVertexAttributesStartingFrom(0);
var bufferUsageHint = model.Volatility == ResourceVolatility.Volatile
? BufferUsageHint.DynamicRead
: BufferUsageHint.StaticRead;
// todo: other formats
var vertices = new VertexPosTanNormTex[model.Positions.Length];
var getTangent = model.Tangents != null ? (Func <IExplicitModel, int, Vector3>)((m, i) => m.Tangents[i]) : (m, i) => Vector3.Zero;
var getNormal = model.Normals != null ? (Func <IExplicitModel, int, Vector3>)((m, i) => m.Normals[i]) : (m, i) => Vector3.Zero;
var getTexCoord = model.TexCoords != null ? (Func <IExplicitModel, int, Vector2>)((m, i) => m.TexCoords[i]) : (m, i) => Vector2.Zero;
for (var i = 0; i < vertices.Length; i++)
{
vertices[i] = new VertexPosTanNormTex(model.Positions[i], getTangent(model, i), getNormal(model, i), getTexCoord(model, i));
}
var vertexBufferSize = vertices.Length * VertexPosTanNormTex.SizeInBytes;
if (glObjects.VertexBuffer == null || glObjects.VertexBuffer.SizeInBytes != vertexBufferSize)
{
glObjects.VertexBuffer?.Dispose();
glObjects.VertexBuffer = infra.GlContext.Create.Buffer(BufferTarget.Array, vertexBufferSize, bufferUsageHint);
}
fixed(VertexPosTanNormTex *pVertices = vertices)
glObjects.VertexBuffer.SetData((IntPtr)pVertices);
var elemInfos = VertexPosTanNormTex.GetElementsInfos(0);
var positionInfo = elemInfos.Single(x => x.CommonSemantic == CommonVertexSemantic.Position);
var normalInfo = elemInfos.Single(x => x.CommonSemantic == CommonVertexSemantic.Normal);
var tangentInfo = elemInfos.Single(x => x.CommonSemantic == CommonVertexSemantic.Tangent);
var texCoordInfo = elemInfos.Single(x => x.CommonSemantic == CommonVertexSemantic.TexCoord);
glObjects.Vao.SetVertexAttributeF(0, glObjects.VertexBuffer, VertexAttributeDimension.Three, VertexAttribPointerType.Float, false, positionInfo.Stride, positionInfo.Offset);
glObjects.Vao.SetVertexAttributeF(1, glObjects.VertexBuffer, VertexAttributeDimension.Three, VertexAttribPointerType.Float, false, normalInfo.Stride, normalInfo.Offset);
glObjects.Vao.SetVertexAttributeF(2, glObjects.VertexBuffer, VertexAttributeDimension.Two, VertexAttribPointerType.Float, false, texCoordInfo.Stride, texCoordInfo.Offset);
glObjects.Vao.SetVertexAttributeF(3, glObjects.VertexBuffer, VertexAttributeDimension.Three, VertexAttribPointerType.Float, false, tangentInfo.Stride, tangentInfo.Offset);
if (!model.IndicesAreTrivial)
{
glObjects.SixteenBitIndices = model.MinIndexSize < sizeof(int);
var indexSize = glObjects.SixteenBitIndices ? sizeof(ushort) : sizeof(int);
var indexBufferSize = model.Indices.Length * indexSize;
if (glObjects.IndexBuffer == null || glObjects.IndexBuffer.SizeInBytes != indexBufferSize)
{
glObjects.Vao.SetElementArrayBuffer(null);
glObjects.IndexBuffer?.Dispose();
glObjects.IndexBuffer = infra.GlContext.Create.Buffer(BufferTarget.ElementArray, indexBufferSize, bufferUsageHint);
}
if (glObjects.SixteenBitIndices)
{
var indices = model.Indices.Select(x => (ushort)x).ToArray();
fixed(ushort *pIndices = indices)
glObjects.IndexBuffer.SetData((IntPtr)pIndices);
}
else
{
fixed(int *pIndices = model.Indices)
glObjects.IndexBuffer.SetData((IntPtr)pIndices);
}
glObjects.Vao.SetElementArrayBuffer(glObjects.IndexBuffer);
}
else
{
glObjects.Vao.SetElementArrayBuffer(null);
glObjects.IndexBuffer?.Dispose();
glObjects.IndexBuffer = null;
}
dirty = false;
return(glObjects);
}
