/// <summary>
/// Creates a framebuffer object and its associated resources (depth and pbuffers).
/// </summary>
/// <param name="Size">Specifies the size (in pixels) of the framebuffer and it's associated buffers.</param>
/// <param name="Attachments">Specifies the attachments to use for the pbuffers.</param>
/// <param name="Format">Specifies the internal pixel format for the pbuffers.</param>
public FBO(Size Size, FramebufferAttachment[] Attachments, PixelInternalFormat Format, bool Mipmaps)
{
this.Size = Size;
this.Attachments = Attachments;
this.Format = Format;
this.mipmaps = Mipmaps;
// First create the framebuffer
BufferID = Gl.GenFramebuffer();
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, BufferID);
if (Attachments.Length == 1 && Attachments[0] == FramebufferAttachment.DepthAttachment)
{
TextureID = new uint[] { Gl.GenTexture() };
Gl.BindTexture(TextureTarget.Texture2D, TextureID[0]);
Gl.TexImage2D(TextureTarget.Texture2D, 0, Format, Size.Width, Size.Height, 0, PixelFormat.DepthComponent, PixelType.Float, IntPtr.Zero);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, TextureParameter.Nearest);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, TextureParameter.Nearest);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, TextureParameter.ClampToEdge);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, TextureParameter.ClampToEdge);
Gl.FramebufferTexture(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, TextureID[0], 0);
Gl.DrawBuffer(DrawBufferMode.None);
Gl.ReadBuffer(ReadBufferMode.None);
}
else
{
// Create and attach a 24-bit depth buffer to the framebuffer
DepthID = Gl.GenRenderbuffer();
Gl.BindRenderbuffer(RenderbufferTarget.Renderbuffer, DepthID);
Gl.RenderbufferStorage(RenderbufferTarget.Renderbuffer, RenderbufferStorage.DepthComponent24, Size.Width, Size.Height);
// Create n texture buffers (known by the number of attachments)
TextureID = new uint[Attachments.Length];
Gl.GenTextures(Attachments.Length, TextureID);
// Bind the n texture buffers to the framebuffer
for (int i = 0; i < Attachments.Length; i++)
{
Gl.BindTexture(TextureTarget.Texture2D, TextureID[i]);
Gl.TexImage2D(TextureTarget.Texture2D, 0, Format, Size.Width, Size.Height, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
if (Mipmaps)
{
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, TextureParameter.Linear);
Gl.TexParameteri(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, TextureParameter.LinearMipMapLinear);
Gl.GenerateMipmap(GenerateMipmapTarget.Texture2D);
}
Gl.FramebufferTexture(FramebufferTarget.Framebuffer, Attachments[i], TextureID[i], 0);
}
// Build the framebuffer and check for errors
Gl.FramebufferRenderbuffer(FramebufferTarget.Framebuffer, FramebufferAttachment.DepthAttachment, RenderbufferTarget.Renderbuffer, DepthID);
}
FramebufferErrorCode status = Gl.CheckFramebufferStatus(FramebufferTarget.Framebuffer);
if (status != FramebufferErrorCode.FramebufferComplete)
{
Console.WriteLine("Frame buffer did not compile correctly. Returned {0}, glError: {1}", status.ToString(), Gl.GetError().ToString());
}
Gl.BindFramebuffer(FramebufferTarget.Framebuffer, 0);
}
/// <summary>
/// Bind a named texture to a texturing target
/// </summary>
/// <param name="Texture">Specifies the texture.</param>
public static void BindTexture(Texture Texture)
{
Gl.BindTexture(Texture.TextureTarget, Texture.TextureID);
}
/// <summary>
/// Create a texture from a supplie bitmap.
/// </summary>
/// <param name="BitmapImage">The already decoded bitmap image.</param>
/// <param name="FlipY">True if the bitmap should be flipped.</param>
public Texture(Bitmap BitmapImage, bool FlipY = true)
{
this.Filename = BitmapImage.GetHashCode().ToString();
LoadBitmap(BitmapImage, FlipY);
Gl.BindTexture(TextureTarget, 0);
}
/// <summary>
/// Loads a compressed DDS file into an OpenGL texture.
/// </summary>
/// <param name="ResourceFile">The path to the DDS file.</param>
private void LoadDDS(string ResourceFile)
{
using (BinaryReader stream = new BinaryReader(new FileStream(ResourceFile, FileMode.Open)))
{
string filecode = new string(stream.ReadChars(4));
if (filecode != "DDS ") // first 4 chars should be "DDS "
{
throw new Exception("File was not a DDS file format.");
}
DDS.DDSURFACEDESC2 imageData = new DDS.DDSURFACEDESC2(stream); // read the DirectDraw surface descriptor
this.Size = new Size((int)imageData.Width, (int)imageData.Height);
if (imageData.LinearSize == 0)
{
throw new Exception("The linear scan line size was zero.");
}
bool compressed = true;
int factor = 0, buffersize = 0, blocksize = 0;
PixelInternalFormat format;
switch (imageData.PixelFormat.FourCC) // check the compression type
{
case "DXT1": // DXT1 compression ratio is 8:1
format = PixelInternalFormat.CompressedRgbaS3tcDxt1Ext;
factor = 2;
blocksize = 8;
break;
case "DXT3": // DXT3 compression ratio is 4:1
format = PixelInternalFormat.CompressedRgbaS3tcDxt3Ext;
factor = 4;
blocksize = 16;
break;
case "DXT5": // DXT5 compression ratio is 4:1
format = PixelInternalFormat.CompressedRgbaS3tcDxt5Ext;
factor = 4;
blocksize = 16;
break;
default:
compressed = false;
if (imageData.PixelFormat.ABitMask == 0xf000 && imageData.PixelFormat.RBitMask == 0x0f00 &&
imageData.PixelFormat.GBitMask == 0x00f0 && imageData.PixelFormat.BBitMask == 0x000f &&
imageData.PixelFormat.RGBBitCount == 16)
{
format = PixelInternalFormat.Rgba;
}
throw new Exception(string.Format("File compression \"{0}\" is not supported.", imageData.PixelFormat.FourCC));
}
if (imageData.LinearSize != 0)
{
buffersize = (int)((imageData.MipmapCount > 1) ? imageData.LinearSize * factor : imageData.LinearSize);
}
else
{
buffersize = (int)(stream.BaseStream.Length - stream.BaseStream.Position);
}
// read the pixel data and then pin it to memory so that the garbage collector
// doesn't shuffle the data around while OpenGL is decompressing it
byte[] pixels = stream.ReadBytes(buffersize);
GCHandle pinned = GCHandle.Alloc(pixels, GCHandleType.Pinned);
try
{
this.TextureTarget = (imageData.Height == 1 || imageData.Width == 1) ? TextureTarget.Texture1D : TextureTarget.Texture2D;
this.TextureID = Gl.GenTexture();
Gl.BindTexture(TextureTarget, TextureID);
Gl.TexParameteri(TextureTarget, TextureParameterName.TextureMinFilter, TextureParameter.Linear);
Gl.TexParameteri(TextureTarget, TextureParameterName.TextureMagFilter, TextureParameter.Linear);
int nOffset = 0, nWidth = (int)imageData.Width, nHeight = (int)imageData.Height;
for (int i = 0; i < (imageData.MipmapCount == 0 ? 1 : imageData.MipmapCount); ++i)
{
if (nWidth == 0)
{
nWidth = 1; // smallest mipmap is 1x1 pixels
}
if (nHeight == 0)
{
nHeight = 1;
}
int nSize = 0;
if (compressed)
{
nSize = ((nWidth + 3) / 4) * ((nHeight + 3) / 4) * blocksize;
Gl.CompressedTexImage2D(TextureTarget, i, format, nWidth, nHeight, 0, nSize, (IntPtr)(pinned.AddrOfPinnedObject().ToInt64() + nOffset));
}
else
{
nSize = nWidth * nHeight * 4 * ((int)imageData.PixelFormat.RGBBitCount / 8);
Gl.TexImage2D(TextureTarget, i, format, nWidth, nHeight, 0, PixelFormat.Bgra, PixelType.UnsignedShort4444, (IntPtr)(pinned.AddrOfPinnedObject().ToInt64() + nOffset));
}
nOffset += nSize;
nWidth /= 2;
nHeight /= 2;
}
}
catch (Exception)
{ // There was some sort of Dll related error, or the target GPU does not support glCompressedTexImage2DARB
throw;
}
finally
{
pinned.Free();
}
}
}
/// <summary>
/// Unbind this Texture on specific target.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding this Texture.
/// </param>
/// <param name="target">
/// A <see cref="TextureTarget"/> that specify the texture target.
/// </param>
protected void Unbind(GraphicsContext ctx, TextureTarget target)
{
// Unbind this Texture on specified target
Gl.BindTexture(target, 0);
}
/// <summary>
/// Bind this Texture on specific target.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for binding this Texture.
/// </param>
/// <param name="target">
/// A <see cref="TextureTarget"/> that specify the texture target.
/// </param>
protected void Bind(GraphicsContext ctx, TextureTarget target)
{
// Bind this Texture on specified target
Gl.BindTexture(target, ObjectName);
}
