/// <summary>
/// Render arbitrary vertices. Clockwise order is expected.
/// </summary>
/// <param name="vertices">The vertex to render.</param>
/// <param name="colors">The color (or colors) of the vertex/vertices.</param>
public void RenderVertices(Vector3[] vertices, params Color[] colors)
{
InvalidateStateBatches();
int neededLength = vertices.Length * VertexData.SizeInBytes;
if (neededLength > VertexBuffer.Size)
{
VertexBuffer.Upload(IntPtr.Zero, (uint)neededLength);
}
Span <VertexData> vertMapper = VertexBuffer.CreateMapper <VertexData>(0, vertices.Length * VertexData.SizeInBytes);
for (var v = 0; v < vertices.Length; v++)
{
vertMapper[v].Vertex = vertices[v];
vertMapper[v].Color = v >= colors.Length ? colors.Length == 0 ? Color.White.ToUint() : colors[0].ToUint() : colors[v].ToUint();
vertMapper[v].Tid = -1;
}
VertexBuffer.FinishMapping();
VertexArrayObject.EnsureBound(CommonVao);
IndexBuffer.EnsureBound(IndexBuffer.SequentialIbo.Pointer);
Gl.DrawElements(PrimitiveType.TriangleFan, vertices.Length, DrawElementsType.UnsignedShort, IntPtr.Zero);
}
/// <summary>
/// Draw the batch. The data is expected to have been uploaded to the vbo at this point.
/// </summary>
/// <param name="vao">The vao to use.</param>
protected void Draw(VertexArrayObject vao)
{
// Bind graphics objects.
VertexArrayObject.EnsureBound(vao);
if (vao.IBO == null)
{
IndexBuffer.EnsureBound(IndexBuffer.QuadIbo.Pointer);
}
BindTextures();
// Render specified range.
var startIndex = (IntPtr)(_startIndex * sizeof(ushort));
uint length = _endIndex - _startIndex ?? (uint)(_mappedTo / 4) * 6 - _startIndex;
Debug.Assert((uint)_mappedTo <= RenderComposer.MAX_INDICES);
Debug.Assert((uint)startIndex + length <= RenderComposer.MAX_INDICES * 6);
Gl.DrawElements(PrimitiveType.Triangles, (int)length, DrawElementsType.UnsignedShort, startIndex);
}