private static Array CreateArray <T>()
{
T[] array = new T[16];
Random random = new Random();
int arrayItemSize = Marshal.SizeOf(typeof(T));
switch (ArrayBufferItem.GetArrayBaseType(typeof(T)))
{
case VertexBaseType.Float:
unsafe {
GCHandle arrayHandle = GCHandle.Alloc(array, GCHandleType.Pinned);
try {
float *arrayPtr = (float *)arrayHandle.AddrOfPinnedObject().ToPointer();
for (int i = 0; i < (array.Length * arrayItemSize) / Marshal.SizeOf(typeof(float)); i++)
{
arrayPtr[i] = (float)random.NextDouble();
}
} finally {
arrayHandle.Free();
}
}
break;
}
return(array);
}
/// <summary>
/// Copy this array buffer object to another one, but having a different array item type.
/// </summary>
/// <param name="vertexArrayType">
/// A <see cref="ArrayBufferItemType"/> that specify the returned <see cref="ArrayBufferObject"/> item type.
/// </param>
/// <returns>
/// It returns a copy of this ArrayBufferObject, but having a different array item. The returned instance is actually
/// a <see cref="ArrayBufferObject"/>.
/// </returns>
/// <exception cref="ArgumentException">
/// Exception thrown if the array base type of this ArrayBufferObject (<see cref="ArrayBaseType"/>) is different to the one
/// derived from <paramref name="vertexArrayType"/>.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Exception thrown if the number of base components of this ArrayBufferObject cannot be mapped into the base components
/// count derived from <paramref name="vertexArrayType"/>.
/// </exception>
public ArrayBufferObject ConvertItemType(ArrayBufferItemType vertexArrayType)
{
if (ArrayBufferItem.GetArrayBaseType(_ArrayType) != ArrayBufferItem.GetArrayBaseType(vertexArrayType))
{
throw new ArgumentException("base type mismatch", "vertexArrayType");
}
uint componentsCount = ItemCount * ArrayBufferItem.GetArrayLength(ArrayType) * ArrayBufferItem.GetArrayRank(ArrayType);
uint convComponentsCount = ArrayBufferItem.GetArrayLength(vertexArrayType) * ArrayBufferItem.GetArrayRank(vertexArrayType);
Debug.Assert(componentsCount >= convComponentsCount);
if ((componentsCount % convComponentsCount) != 0)
{
throw new InvalidOperationException("components length incompatibility");
}
ArrayBufferObject arrayObject = CreateArrayObject(vertexArrayType, Hint);
// Different item count due different lengths
arrayObject.Create(componentsCount / convComponentsCount);
// Memory is copied
Memory.MemoryCopy(arrayObject.ClientBufferAddress, ClientBufferAddress, ClientBufferSize);
return(arrayObject);
}
private void EnableVertexAttribute(GraphicsContext ctx, ShaderProgram.AttributeBinding attributeBinding)
{
ArrayBufferObjectBase.IArraySection arraySection = ArrayBuffer.GetArraySection(ArraySectionIndex);
int arrayBaseType = (int)ArrayBufferItem.GetArrayBaseType(arraySection.ItemType);
int arrayLength = (int)ArrayBufferItem.GetArrayLength(arraySection.ItemType);
int arrayStride = arraySection.Stride.ToInt32();
// Avoid rendundant buffer binding and relative vertex array setup
if (ctx.Caps.GlExtensions.VertexArrayObject_ARB && IsDirty == false)
{
CheckVertexAttribute(ctx, attributeBinding);
return;
}
// Bind the array buffer
ArrayBuffer.Bind(ctx);
// Bind varying attribute to currently bound buffer object
switch (ArrayBufferItem.GetArrayBaseType(attributeBinding.Type))
{
case VertexBaseType.Float:
Gl.VertexAttribPointer(
attributeBinding.Location,
arrayLength, arrayBaseType, arraySection.Normalized,
arrayStride, arraySection.Offset
);
break;
case VertexBaseType.Int:
case VertexBaseType.UInt:
Gl.VertexAttribIPointer(
attributeBinding.Location,
arrayLength, arrayBaseType,
arrayStride, arraySection.Offset
);
break;
case VertexBaseType.Double:
Gl.VertexAttribLPointer(
attributeBinding.Location,
arrayLength, arrayBaseType,
arrayStride, arraySection.Offset
);
break;
default:
throw new NotSupportedException(String.Format("vertex attribute type {0} not supported", attributeBinding.Type));
}
// Enable vertex attribute
Gl.EnableVertexAttribArray(attributeBinding.Location);
}
internal void CheckVertexAttribute(GraphicsContext ctx, ShaderProgram.AttributeBinding attributeBinding)
{
if (ArrayBuffer != null)
{
ArrayBufferObjectBase.IArraySection arraySection = ArrayBuffer.GetArraySection(ArraySectionIndex);
int arrayBaseType = (int)ArrayBufferItem.GetArrayBaseType(arraySection.ItemType);
int arrayLength = (int)ArrayBufferItem.GetArrayLength(arraySection.ItemType);
int arrayStride = arraySection.Stride.ToInt32();
// Check effective state
IntPtr vertexAttribPointer;
int vertexAttribArrayBufferBinding;
int vertexAttribArraySize;
int vertexAttribArrayType;
int vertexAttribArrayNormalized;
int vertexAttribArrayStride;
int vertexAttribArrayEnabled;
// Attribute pointer/offset
Gl.GetVertexAttribPointer(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_POINTER, out vertexAttribPointer);
Debug.Assert(vertexAttribPointer == new IntPtr(arraySection.Pointer.ToInt64() + arraySection.Offset.ToInt64()));
// Array buffer binding
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING, out vertexAttribArrayBufferBinding);
Debug.Assert(vertexAttribArrayBufferBinding == ArrayBuffer.ObjectName);
// Array size
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_SIZE, out vertexAttribArraySize);
Debug.Assert(vertexAttribArraySize == arrayLength);
// Array type
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_TYPE, out vertexAttribArrayType);
Debug.Assert(vertexAttribArrayType == arrayBaseType);
// Array normalized
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_NORMALIZED, out vertexAttribArrayNormalized);
Debug.Assert((vertexAttribArrayNormalized != 0) == arraySection.Normalized);
// Array size
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_STRIDE, out vertexAttribArrayStride);
Debug.Assert(vertexAttribArrayStride == arrayStride);
// Attribute enabled
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_ENABLED, out vertexAttribArrayEnabled);
Debug.Assert(vertexAttribArrayEnabled == Gl.TRUE);
}
else
{
int vertexAttribArrayEnabled;
// Attribute disabled
Gl.GetVertexAttrib(attributeBinding.Location, Gl.VERTEX_ATTRIB_ARRAY_ENABLED, out vertexAttribArrayEnabled);
Debug.Assert(vertexAttribArrayEnabled == Gl.FALSE);
}
}
/// <summary>
/// Copy from an ArrayBufferObject with an indirection defined by an index.
/// </summary>
/// <param name="buffer">
/// An <see cref="ArrayBufferObject"/> that specify the source data buffer to copy.
/// </param>
/// <param name="indices">
/// An array of indices indicating the order of the vertices copied from <paramref name="buffer"/>.
/// </param>
/// <param name="count">
/// A <see cref="UInt32"/> that specify how many elements to copy from <paramref name="buffer"/>.
/// </param>
/// <param name="offset">
/// A <see cref="UInt32"/> that specify the first index considered from <paramref name="indices"/>. A
/// value of 0 indicates that the indices are considered from the first one.
/// </param>
/// <param name="stride">
/// A <see cref="UInt32"/> that specify the offset between two indexes considered for the copy operations
/// from <paramref name="indices"/>. A value of 1 indicates that all considered indices are contiguos.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="buffer"/> or <paramref name="indices"/> are null.
/// </exception>
/// <exception cref="ArgumentException">
/// Exception thrown if <paramref name="count"/> or <paramref name="stride"/> equals to 0.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Exception thrown if the combination of <paramref name="count"/>, <paramref name="offset"/> and
/// <paramref name="stride"/> will cause a <paramref name="indices"/> array access out of its bounds.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Exception thrown if this <see cref="ArrayBufferObject"/> have a complex data layout, of it has a vertex
/// base type different from <paramref name="buffer"/>.
/// </exception>
/// <remarks>
/// <para>
/// After a successfull copy operation, the previous buffer is discarded replaced by the copied buffer from
/// <paramref name="buffer"/>.
/// </para>
/// </remarks>
public void Copy(ArrayBufferObject buffer, uint[] indices, uint count, uint offset, uint stride)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (indices == null)
{
throw new ArgumentNullException("indices");
}
if (count == 0)
{
throw new ArgumentException("invalid", "count");
}
if (stride == 0)
{
throw new ArgumentException("invalid", "stride");
}
if (offset + ((count - 1) * stride) > indices.Length)
{
throw new InvalidOperationException("indices out of bounds");
}
if (ArrayBufferItem.GetArrayBaseType(_ArrayType) != ArrayBufferItem.GetArrayBaseType(buffer._ArrayType))
{
throw new InvalidOperationException("base type mismatch");
}
Create(count);
unsafe {
byte *dstPtr = (byte *)ClientBufferAddress.ToPointer();
for (uint i = 0; i < count; i++, dstPtr += ItemSize)
{
uint arrayIndex = indices[(i * stride) + offset];
// Position 'srcPtr' to the indexed element
byte *srcPtr = ((byte *)buffer.ClientBufferAddress.ToPointer()) + (ItemSize * arrayIndex);
// Copy the 'arrayIndex'th element
Memory.MemoryCopy(dstPtr, srcPtr, ItemSize);
}
}
}
/// <summary>
/// Convert this array buffer object in a strongly-typed array.
/// </summary>
/// <typeparam name="T">
/// An arbitrary structure defining the returned array item. It doesn't need to be correlated with the ArrayBufferObject
/// layout.
/// </typeparam>
/// <param name="arrayLength">
/// A <see cref="UInt32"/> that specify the number of elements of the returned array.
/// </param>
/// <returns>
/// It returns an array having all items stored by this ArrayBufferObject.
/// </returns>
public T[] ToArray <T>(uint arrayLength) where T : struct
{
if (arrayLength > ItemCount)
{
throw new ArgumentOutOfRangeException("arrayLength", arrayLength, "cannot exceed items count");
}
if (ClientBufferAddress == IntPtr.Zero)
{
throw new InvalidOperationException("no client buffer");
}
Type arrayElementType = typeof(T);
if (arrayElementType == null || !arrayElementType.IsValueType)
{
throw new InvalidOperationException("invalid array element type");
}
// The base type should be corresponding
ArrayBufferItemType arrayElementVertexType = ArrayBufferItem.GetArrayType(arrayElementType);
if (ArrayBufferItem.GetArrayBaseType(_ArrayType) != ArrayBufferItem.GetArrayBaseType(arrayElementVertexType))
{
throw new InvalidOperationException(String.Format("source base type of {0} incompatible with destination base type of {1}", arrayElementType.Name, ArrayBufferItem.GetArrayBaseType(_ArrayType)));
}
// Array element item size cannot exceed ItemSize
uint arrayItemSize = ArrayBufferItem.GetArrayItemSize(arrayElementVertexType);
if (arrayItemSize > ItemSize)
{
throw new ArgumentException("array element type too big", "array");
}
T[] array = new T[arrayLength];
// Copy from buffer data to array data
CopyArray(array, arrayItemSize, ClientBufferAddress, ItemSize, 0, arrayLength);
return(array);
}
/// <summary>
///
/// </summary>
/// <param name="vertexArrayType"></param>
public ArrayBufferItemAttribute(ArrayBufferItemType vertexArrayType)
{
ArrayBaseType = ArrayBufferItem.GetArrayBaseType(vertexArrayType);
ArrayLength = ArrayBufferItem.GetArrayLength(vertexArrayType);
ArrayRank = ArrayBufferItem.GetArrayRank(vertexArrayType);
}
/// <summary>
/// Copy from an ArrayBufferObject with an indirection defined by an index (polygon tessellation).
/// </summary>
/// <param name="buffer">
/// An <see cref="ArrayBufferObject"/> that specify the source data buffer to copy.
/// </param>
/// <param name="vcount">
/// An array of integers indicating the number of the vertices of the polygon copied from <paramref name="buffer"/>. This parameter
/// indicated how many polygons to copy (the array length). Each item specify the number of vertices composing the polygon.
/// </param>
/// <param name="indices">
/// An array of indices indicating the order of the vertices copied from <paramref name="buffer"/>.
/// </param>
/// <param name="offset">
/// A <see cref="UInt32"/> that specify the first index considered from <paramref name="indices"/>. A
/// value of 0 indicates that the indices are considered from the first one.
/// </param>
/// <param name="stride">
/// A <see cref="UInt32"/> that specify the offset between two indexes considered for the copy operations
/// from <paramref name="indices"/>. A value of 1 indicates that all considered indices are contiguos.
/// </param>
/// <exception cref="ArgumentNullException">
/// Exception thrown if <paramref name="buffer"/>, <paramref name="indices"/> or <paramref name="vcount"/> are null.
/// </exception>
/// <exception cref="InvalidOperationException">
/// Exception thrown if this <see cref="ArrayBufferObject"/> have a complex data layout, of it has a vertex
/// base type different from <paramref name="buffer"/>.
/// </exception>
/// <remarks>
/// <para>
/// After a successfull copy operation, the previous buffer is discarded replaced by the copied buffer from
/// <paramref name="buffer"/>.
/// </para>
/// </remarks>
public void Copy(ArrayBufferObject buffer, uint[] indices, uint[] vcount, uint offset, uint stride)
{
if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
if (indices == null)
{
throw new ArgumentNullException("indices");
}
if (vcount == null)
{
throw new ArgumentNullException("indices");
}
if (stride == 0)
{
throw new ArgumentException("invalid", "stride");
}
if (ArrayBufferItem.GetArrayBaseType(_ArrayType) != ArrayBufferItem.GetArrayBaseType(buffer._ArrayType))
{
throw new InvalidOperationException("base type mismatch");
}
// Allocate array buffer
uint minVertices = UInt32.MaxValue, maxVertices = UInt32.MinValue;
Array.ForEach(vcount, delegate(uint v) {
minVertices = Math.Min(v, minVertices);
maxVertices = Math.Max(v, maxVertices);
});
if ((minVertices < 3) && (maxVertices >= 3))
{
throw new ArgumentException("ambigous polygons set", "vcount");
}
uint totalVerticesCount = 0;
Array.ForEach(vcount, delegate(uint v) {
if (v == 4)
{
totalVerticesCount += 6; // Triangulate quad with two triangles
}
else if (v > 4)
{
totalVerticesCount += (v - 2) * 3; // Triangulate as if it is a polygon
}
else
{
Debug.Assert(v == 3);
totalVerticesCount += 3; // Exactly a triangle
}
});
Create(totalVerticesCount);
// Copy polygons (triangulate)
uint count = 0;
unsafe {
byte *dstPtr = (byte *)ClientBufferAddress.ToPointer();
uint indicesIndex = offset;
for (uint i = 0; i < vcount.Length; i++)
{
uint verticesCount = vcount[i];
uint[] verticesIndices;
if (verticesCount == 4)
{
verticesIndices = new uint[6];
verticesIndices[0] = indices[indicesIndex + (0 * stride)];
verticesIndices[1] = indices[indicesIndex + (1 * stride)];
verticesIndices[2] = indices[indicesIndex + (2 * stride)];
verticesIndices[3] = indices[indicesIndex + (0 * stride)];
verticesIndices[4] = indices[indicesIndex + (2 * stride)];
verticesIndices[5] = indices[indicesIndex + (3 * stride)];
indicesIndex += 4 * stride;
}
else if (verticesCount > 4)
{
uint triCount = verticesCount - 2;
uint pivotIndex = indicesIndex;
verticesIndices = new uint[triCount * 3];
// Copy polygon indices
for (uint tri = 0; tri < triCount; tri++)
{
verticesIndices[tri * 3 + 0] = indices[pivotIndex];
verticesIndices[tri * 3 + 1] = indices[indicesIndex + (tri + 2) * stride];
verticesIndices[tri * 3 + 2] = indices[indicesIndex + (tri + 1) * stride];
}
indicesIndex += verticesCount * stride;
}
else
{
verticesIndices = new uint[verticesCount];
for (int j = 0; j < verticesCount; j++, indicesIndex += stride)
{
verticesIndices[j] = indices[indicesIndex];
}
}
count += (uint)verticesIndices.Length;
for (uint j = 0; j < verticesIndices.Length; j++, dstPtr += ItemSize)
{
// Position 'srcPtr' to the indexed element
byte *srcPtr = ((byte *)buffer.ClientBufferAddress.ToPointer()) + (ItemSize * verticesIndices[j]);
// Copy the 'arrayIndex'th element
Memory.MemoryCopy(dstPtr, srcPtr, ItemSize);
}
}
}
}