/// <summary>
/// Generate texture coordinates for the elements defined in this vertex array.
/// </summary>
/// <param name="genTexCoordCallback">
/// A <see cref="VertexArrayTexGenDelegate"/> used for generating texture coordinates.
/// </param>
public void GenerateTexCoords(VertexArrayTexGenDelegate genTexCoordCallback)
{
foreach (Element vertexElement in DrawElements)
{
vertexElement.GenerateTexCoord(this, genTexCoordCallback);
}
}
/// <summary>
/// Generate texture coordinates for the elements defined in this vertex array.
/// </summary>
/// <param name="genTexCoordCallback">
/// A <see cref="VertexArrayTexGenDelegate"/> used for generating texture coordinates.
/// </param>
public void GenerateTexCoords(GraphicsContext ctx, VertexArrayTexGenDelegate genTexCoordCallback)
{
foreach (Element vertexElement in DrawElements)
{
vertexElement.GenerateTexCoord(ctx, this, genTexCoordCallback);
}
}
/// <summary>
/// Generate texture coordinates for this Element.
/// </summary>
/// <param name="vertexArray">
/// The <see cref="VertexArrayObject"/>
/// </param>
public override void GenerateTexCoord(VertexArrayObject vertexArray, VertexArrayTexGenDelegate genTexCoordCallback)
{
IVertexArray positionArray = vertexArray.GetVertexArray(VertexArraySemantic.Position);
if (positionArray == null)
{
throw new InvalidOperationException("position semantic not set");
}
IVertexArray texArray = vertexArray.GetVertexArray(VertexArraySemantic.TexCoord);
if (texArray == null)
{
throw new InvalidOperationException("texture semantic not set");
}
if (texArray.Array == null)
{
throw new InvalidOperationException("texture array not set");
}
if (positionArray.Array != null)
{
positionArray.Array.Map();
}
texArray.Array.Map();
ArrayIndices.Map();
try {
switch (ElementsMode)
{
case PrimitiveType.Triangles:
case PrimitiveType.TriangleStrip:
switch (positionArray.ArraySection.ItemType)
{
case ArrayBufferItemType.Float3:
GenerateTexCoordsTriangle3f(positionArray, texArray, genTexCoordCallback);
break;
default:
throw new NotSupportedException("normals generation not supported for elements of type " + positionArray.ArraySection.ItemType);
}
break;
default:
throw new NotSupportedException("normals generation not supported for primitive " + ElementsMode);
}
} finally {
if (positionArray.Array != null)
{
positionArray.Array.Unmap();
}
texArray.Array.Unmap();
ArrayIndices.Unmap();
}
}
private void GenerateTexCoordsTriangle3f(IVertexArray positionArray, IVertexArray texArray, VertexArrayTexGenDelegate genTexCoordCallback)
{
for (uint i = 0, v = ElementOffset; i < ArrayIndices.ItemCount; i++, v++)
{
uint vIndex = ArrayIndices.GetIndex(v);
Vertex3f v0 = positionArray.GetElement <Vertex3f>(vIndex);
texArray.SetElement <Vertex2f>(genTexCoordCallback(v0), vIndex);
}
}
/// <summary>
/// Generate texture coordinates for this Element.
/// </summary>
/// <param name="vertexArray">
/// The <see cref="VertexArrayObject"/>
/// </param>
public virtual void GenerateTexCoord(VertexArrayObject vertexArray, VertexArrayTexGenDelegate genTexCoordCallback)
{
throw new NotImplementedException();
}