/// <summary>
/// Generates the vertices, normals and indices and creates them for the OpenGL.
/// This method has to be called once before drawing.
/// </summary>
/// <param name="gl"></param>
public void GenerateGeometry(OpenGL gl, OGLModelUsage usage)
{
GL = gl;
_usage = usage;
// Create the data buffers.
var buffers = OGLBufferId.CreateBufferIds(gl, 3);
IndexBuffer = new IBO(buffers[0]);
NormalBuffer = new VBO(buffers[1]);
VertexBuffer = new VBO(buffers[2]);
if (AutoCalculateNormals)
{
CalculateNormals();
}
var vertData = Vertices.SelectMany(v => v.to_array()).ToArray();
VertexBuffer.BindBuffer(gl); // GL.BindBuffer(OpenGL.GL_ARRAY_BUFFER, VertexBuffer.Buffer.Value);
VertexBuffer.SetBufferData(gl, OGLBufferDataTarget.ArrayBuffer, vertData, usage, 3); // GL.BufferData(OpenGL.GL_ARRAY_BUFFER, vertData, (uint)usage);
var normData = Normals.SelectMany(v => v.to_array()).ToArray();
NormalBuffer.BindBuffer(gl); //GL.BindBuffer(OpenGL.GL_ARRAY_BUFFER, NormalBuffer.Buffer.Value);
NormalBuffer.SetBufferData(gl, OGLBufferDataTarget.ArrayBuffer, normData, usage, 3); // GL.BufferData(OpenGL.GL_ARRAY_BUFFER, normData, (uint)usage);
IndexBuffer.BindBuffer(gl); // GL.BindBuffer(OpenGL.GL_ARRAY_BUFFER, IndexBuffer.Buffer.Value);
IndexBuffer.SetBufferData(gl, OGLBufferDataTarget.ArrayBuffer, Indices, usage, 1); // GL.BufferData(OpenGL.GL_ARRAY_BUFFER, Indices, (uint)usage);
if (new OGLModelUsage[] { OGLModelUsage.StaticCopy, OGLModelUsage.StaticDraw, OGLModelUsage.StaticRead }.Contains(usage))
{
ClearStaticData();
}
}
/// <summary>
/// Updates the buffers in GPU memory.
/// </summary>
/// <param name="gl">The GL.</param>
public void UpdateGeometry(OpenGL gl)
{
var verts = Vertices.SelectMany(v => v.to_array()).ToArray();
var norms = Normals.SelectMany(v => v.to_array()).ToArray();
VertexBuffer.BindBuffer(gl); // gl.BindBuffer(OpenGL.GL_ARRAY_BUFFER, VertexBufferId.Value);
VertexBuffer.SetBufferData(gl, OGLBufferDataTarget.ArrayBuffer, verts, Usage, 3); // gl.BufferData(OpenGL.GL_ARRAY_BUFFER, verts, (uint)Usage);
NormalBuffer.BindBuffer(gl); // gl.BindBuffer(OpenGL.GL_ARRAY_BUFFER, NormalBufferId.Value);
NormalBuffer.SetBufferData(gl, OGLBufferDataTarget.ArrayBuffer, norms, Usage, 3); // gl.BufferData(OpenGL.GL_ARRAY_BUFFER, norms, (uint)Usage);
}