public VertexBuffer(int size)
{
OpenGL.glGenBuffers(1, out buffer);
OpenGL.CheckGLError();
Bind();
// Generates a buffer with uninitialized memory.
OpenGL.glBufferData(OpenGL.GL_ARRAY_BUFFER,
new IntPtr(VertexSize * size),
IntPtr.Zero,
OpenGL.GL_DYNAMIC_DRAW);
OpenGL.CheckGLError();
// We need to zero all the memory. Let's generate a smallish array and copy that over the whole buffer.
var zeroedArrayElementSize = Math.Min(size, 2048);
var ptr = GCHandle.Alloc(new T[zeroedArrayElementSize], GCHandleType.Pinned);
try
{
for (var offset = 0; offset < size; offset += zeroedArrayElementSize)
{
var length = Math.Min(zeroedArrayElementSize, size - offset);
OpenGL.glBufferSubData(OpenGL.GL_ARRAY_BUFFER,
new IntPtr(VertexSize * offset),
new IntPtr(VertexSize * length),
ptr.AddrOfPinnedObject());
OpenGL.CheckGLError();
}
}
finally
{
ptr.Free();
}
}
public VertexBuffer(int size, string ownername)
{
#if DEBUG_VERTEX
Console.WriteLine("VB created owner: " + ownername);
#endif
this.ownername = ownername;
GraphicsContext.VAOReserveStack += 1; //помечаем, что резерв уменьшился.
LocalVertexArrayIndex = GraphicsContext.VAOReserveStack;
BindOnceOpen();
// Generates a buffer with uninitialized memory.
OpenGL.glBufferData(OpenGL.GL_ARRAY_BUFFER,
new IntPtr(VertexSize * size),
IntPtr.Zero,
OpenGL.GL_DYNAMIC_DRAW);
OpenGL.CheckGLError();
// We need to zero all the memory. Let's generate a smallish array and copy that over the whole buffer.
var zeroedArrayElementSize = Math.Min(size, 2048);
var ptr = GCHandle.Alloc(new T[zeroedArrayElementSize], GCHandleType.Pinned);
try
{
for (var offset = 0; offset < size; offset += zeroedArrayElementSize)
{
var length = Math.Min(zeroedArrayElementSize, size - offset);
OpenGL.glBufferSubData(OpenGL.GL_ARRAY_BUFFER,
new IntPtr(VertexSize * offset),
new IntPtr(VertexSize * length),
ptr.AddrOfPinnedObject());
OpenGL.CheckGLError();
}
}
finally
{
ptr.Free();
}
BindOnceClose();
}
public VertexBuffer(int size)
{
OpenGL.glGenBuffers(1, out buffer);
OpenGL.CheckGLError();
Bind();
var ptr = GCHandle.Alloc(new T[size], GCHandleType.Pinned);
try
{
OpenGL.glBufferData(OpenGL.GL_ARRAY_BUFFER,
new IntPtr(VertexSize * size),
ptr.AddrOfPinnedObject(),
OpenGL.GL_DYNAMIC_DRAW);
}
finally
{
ptr.Free();
}
OpenGL.CheckGLError();
}
