/// <summary>
/// Create the texture, using this technique.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
public override void Create(GraphicsContext ctx)
{
int internalFormat = _PixelFormat.GetGlInternalFormat();
PixelFormat format = _PixelFormat.GetGlFormat();
// Define empty texture
Gl.TexImage1D(TextureTarget.Texture1d, (int)_Level, internalFormat, (int)_Width, 0, format, /* Unused */ PixelType.UnsignedByte, IntPtr.Zero);
// Define texture properties
_Texture1d.DefineExtents(_PixelFormat, _Width, 1, 1, _Level);
}
/// <summary>
/// Create the texture, using this technique.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
public override void Create(GraphicsContext ctx)
{
InternalFormat internalFormat = _PixelFormat.GetGlInternalFormat();
PixelFormat format = _PixelFormat.GetGlFormat();
// Define empty texture
Gl.TexImage2D(_Target, (int)_Level, internalFormat, (int)_Width, (int)_Height, 0, format, /* Unused */ PixelType.UnsignedByte, IntPtr.Zero);
// Define texture properties
_Texture2d.SetMipmap(_PixelFormat, _Width, _Height, 1, _Level);
}
/// <summary>
/// Create the texture, using this technique.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/> used for allocating resources.
/// </param>
public override void Create(GraphicsContext ctx)
{
InternalFormat internalFormat = _PixelFormat.GetGlInternalFormat();
PixelFormat format = _PixelFormat.GetGlFormat();
PixelType type = _PixelFormat.GetPixelType();
for (int i = 0; i < 6; i++)
{
Image image = _Images[i];
// Set pixel alignment
State.PixelAlignmentState.Unpack(image.Stride).Apply(ctx, null);
// Upload texture contents
Gl.TexImage2D(_CubeTargets[i], 0, internalFormat, (int)image.Width, (int)image.Height, 0, format, type, image.ImageBuffer);
}
// Define texture properties
_TextureCube.SetMipmap(_PixelFormat, _Images[0].Width, _Images[0].Height, 1, 0);
}
/// <summary>
/// Read this GraphicsSurface color buffer.
/// </summary>
/// <param name="ctx">
/// A <see cref="GraphicsContext"/>
/// </param>
/// <param name="rBuffer">
/// A <see cref="ReadBufferMode"/> that specify the read buffer where the colors are read from.
/// </param>
/// <param name="x">
/// A <see cref="Int32"/> that specify the x coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="y">
/// A <see cref="Int32"/> that specify the y coordinate of the lower left corder of the rectangle area to read.
/// </param>
/// <param name="width">
/// A <see cref="Int32"/> that specify the width of the rectangle area to read.
/// </param>
/// <param name="height">
/// A <see cref="Int32"/> that specify the height of the rectangle area to read.
/// </param>
/// <param name="pType">
/// A <see cref="PixelLayout"/> which determine the pixel storage of the returned image.
/// </param>
/// <returns>
/// It returns an <see cref="Image"/> representing the current read buffer <paramref name="rBuffer"/>.
/// </returns>
protected Image ReadBuffer(GraphicsContext ctx, ReadBufferMode rBuffer, uint x, uint y, uint width, uint height, PixelLayout pType)
{
Image image = null;
if ((x + width > Width) || (y + height > Height))
{
throw new ArgumentException("specified region lies outside the GraphicsSurface");
}
// Bind for reading
BindRead(ctx);
// Set for reading
Gl.ReadBuffer(rBuffer);
// Allocate image holding data read
image = new Image();
image.Create(pType, width, height);
// Set pixel transfer
foreach (int alignment in new int[] { 8, 4, 2, 1 })
{
if (image.Stride % alignment == 0)
{
Gl.PixelStore(PixelStoreParameter.PackAlignment, alignment);
break;
}
}
// Grab frame buffer pixels
PixelFormat rFormat = pType.GetGlFormat();
PixelType rType = pType.GetPixelType();
Gl.ReadPixels((int)x, (int)y, (int)width, (int)height, rFormat, rType, image.ImageBuffer);
// Unbind from reading
UnbindRead(ctx);
return(image);
}
