/// <summary>
/// Upload the Vertices into Buffer Data.
/// </summary>
public void Update(Vertex[] vertices)
{
// Assign vertices information
_vertices = vertices;
_length = vertices.Length;
// Pin the vertices, prevent GC wipe this pointer
using (var memory = new MemoryLock(_vertices))
{
var pointer = memory.Address;
// Calculate the stride and upload the vertices
var stride = Vertex.Stride;
GL.VertexPointer(2, VertexPointerType.Float, stride,
pointer.Increment(0));
GLChecker.CheckError();
GL.TexCoordPointer(2, TexCoordPointerType.Float, stride,
pointer.Increment(8));
GLChecker.CheckError();
GL.ColorPointer(4, ColorPointerType.UnsignedByte, stride,
pointer.Increment(16));
GLChecker.CheckError();
}
}
/// <summary>
/// Render the vertices using current implementation.
/// </summary>
public void Render(PrimitiveType type)
{
// Notes:
// GL.GetError() cannot be called upon render the immediate mode implementation.
// There is no way to check automatically whether our data is valid or not.
// Just make sure the specified colors, texcoords and positions are valid and correct.
// Check the error before begin(?)
GLChecker.CheckError();
// Specify primitive mode.
GL.Begin((OpenTK.Graphics.OpenGL.PrimitiveType)((int)type));
// Set the Color, Texture Coordinate and Positions.
for (int i = 0; i < _vertices.Length; i++)
{
// Color.
GL.Color4(_vertices[i].Color.R, _vertices[i].Color.G, _vertices[i].Color.B, _vertices[i].Color.A);
// TexCoord.
GL.TexCoord2(_vertices[i].TexCoords.X, _vertices[i].TexCoords.Y);
// Position.
GL.Vertex2(_vertices[i].Position.X, _vertices[i].TexCoords.Y);
}
// Finished.
GL.End();
// Check error again(?)
GLChecker.CheckError();
}