/// <summary>
///
/// </summary>
/// <returns></returns>
protected override IndependentBufferPtr Upload2GPU()
{
uint[] buffers = new uint[1];
glGenBuffers(1, buffers);
const uint target = OpenGL.GL_ATOMIC_COUNTER_BUFFER;
glBindBuffer(target, buffers[0]);
glBufferData(target, this.ByteLength, this.Header, (uint)this.Usage);
glBindBuffer(target, 0);
var bufferPtr = new AtomicCounterBufferPtr(buffers[0], this.Length, this.ByteLength);
return(bufferPtr);
}
protected override void DoInitialize()
{
this.buildListsRenderer.Initialize();
this.resolve_lists.Initialize();
{
var texture = new Texture(TextureTarget.Texture2D,
new NullImageFiller(MAX_FRAMEBUFFER_WIDTH, MAX_FRAMEBUFFER_HEIGHT, OpenGL.GL_R32UI, OpenGL.GL_RED_INTEGER, OpenGL.GL_UNSIGNED_BYTE),
new SamplerParameters(TextureWrapping.Repeat, TextureWrapping.Repeat, TextureWrapping.Repeat, TextureFilter.Nearest, TextureFilter.Nearest));
texture.Initialize();
this.headTexture = texture;
OpenGL.BindImageTexture(0, this.headTexture.Id, 0, true, 0, OpenGL.GL_READ_WRITE, OpenGL.GL_R32UI);
}
// Create buffer for clearing the head pointer texture
//var buffer = new IndependentBuffer<uint>(BufferTarget.PixelUnpackBuffer, BufferUsage.StaticDraw, false);
using (var buffer = new PixelUnpackBuffer <uint>(BufferUsage.StaticDraw, false))
{
buffer.Create(MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT);
// NOTE: not all initial values are zero in this unmanged array.
//unsafe
//{
// var array = (uint*)buffer.Header.ToPointer();
// for (int i = 0; i < MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT; i++)
// {
// array[i] = 0;
// }
//}
this.headClearBufferPtr = buffer.GetBufferPtr() as PixelUnpackBufferPtr;
}
// Create the atomic counter buffer
using (var buffer = new AtomicCounterBuffer <uint>(BufferUsage.DynamicCopy, false))
{
buffer.Create(1);
this.atomicCountBufferPtr = buffer.GetBufferPtr() as AtomicCounterBufferPtr;
}
// Bind it to a texture (for use as a TBO)
using (var buffer = new TextureBuffer <vec4>(BufferUsage.DynamicCopy, noDataCopyed: false))
{
buffer.Create(elementCount: MAX_FRAMEBUFFER_WIDTH * MAX_FRAMEBUFFER_HEIGHT * 3);
IndependentBufferPtr bufferPtr = buffer.GetBufferPtr();
Texture texture = bufferPtr.DumpBufferTexture(OpenGL.GL_RGBA32UI, autoDispose: true);
texture.Initialize();
bufferPtr.Dispose();// dispose it ASAP.
this.linkedListTexture = texture;
}
{
OpenGL.BindImageTexture(1, this.linkedListTexture.Id, 0, false, 0, OpenGL.GL_WRITE_ONLY, OpenGL.GL_RGBA32UI);
}
OpenGL.ClearDepth(1.0f);
}
