/// <summary>
/// Creates new (set of) renderable Texture(s)
/// </summary>
/// <param name="width">The width in pixels of the Texture(s)</param>
/// <param name="height">The height in pixels of the Texture(s)</param>
/// <param name="depth">True if depthbuffer is required when rendering to the Texture(s)</param>
/// <param name="components">The number of color components the Texture(s) have</param>
/// <param name="format">The data format the Texture(s) shall use, default is 16bit Half</param>
/// <param name="buffers">The number of Textures to use.</param>
public RenderToTexture(int width, int height, bool depth, int components = 3, Type format = null, int buffers = 1)
{
_fbo = new FramebufferObject();
_textures = new Texture2D[buffers];
_bufs = new DrawBuffersEnum[buffers];
for (var i = 0; i < buffers; i++)
_bufs[i] = DrawBuffersEnum.ColorAttachment0 + i;
_fbo.Activate();
GL.DrawBuffers(_textures.Length, _bufs);
Utilities.CheckGL();
_fbo.Finish();
GL.DrawBuffer(DrawBufferMode.Back);
Utilities.CheckGL();
for (var i = 0; i < buffers; i++)
{
_textures[i] = new Texture2D(width, height, components, format ?? typeof(Half));
_fbo.SetTexture(_textures[i], i);
}
if (depth)
{
_rbo = new RenderbufferObject();
_fbo.Activate();
_rbo.SetSize(width, height);
_fbo.Finish();
}
_fbo.Check();
Utilities.CheckGL();
}
public ClipmapLevel(float scale, int scaleInt, Clipmap clipmap)
{
_d = clipmap.DValue;
_h = clipmap.HValue;
_n = _d - 1;
_clipmap = clipmap;
Scale = scale;
ScaleInt = scaleInt;
Heightmap = new Texture2D(_d, _d, 3, typeof(float));
Heightmap.Activate();
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
Heightmap.Finish();
}
public ClipmapLevel(int level, float scale, Clipmap clipmap, ClipmapLevel parent)
{
_d = clipmap.DValue;
_n = _d - 1;
_cache = new float[_d, _d];
_clipmap = clipmap;
_parent = parent;
_level = level;
_scaleInt = 1 << _level;
Scale = scale * _scaleInt;
Heightmap = new Texture2D(_d, _d, 3, typeof(float));
Heightmap.Activate();
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
Heightmap.Finish();
}
/// <summary>
/// Creates a new managed 2D Texture with the same format as an existing one
/// </summary>
/// <param name="width">The width in Pixels of the Texture</param>
/// <param name="height">The height in Pixels of the Texture</param>
/// <param name="other">The texture to copy the format from</param>
public Texture2D(int width, int height, Texture2D other)
: this(width, height, other._internalFormat, other.Target)
{
if (other == null)
throw new ArgumentNullException("other");
}
/// <summary>
/// Loads a texture from a bitmap
/// </summary>
/// <param name="bmp">The bitmap to load from</param>
/// <returns>The texture object</returns>
public static Texture2D FromBitmap(Bitmap bmp)
{
if (bmp == null)
throw new ArgumentNullException("bmp");
var bits = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
var components = Image.IsAlphaPixelFormat(bmp.PixelFormat) ? 4 : 3;
var tex = new Texture2D(bmp.Width, bmp.Height, components, typeof(byte)); // lotsa possible opts here
tex.Activate();
var p = bits.Scan0;
for (var y = 0; y < bits.Height; y++, p += bits.Stride)
{
GL.TexSubImage2D(tex.Target, 0, 0, y, bits.Width, 1,
PixelFormat.Bgra, PixelType.UnsignedByte, p);
}
return tex;
}
/// <summary>
/// Associates a Texture with the framebuffer object
/// </summary>
/// <param name="texture">The texture to associate</param>
/// <param name="index">The channel to asscociate</param>
public void SetTexture(Texture2D texture, int index = 0)
{
if (texture == null)
throw new ArgumentNullException("texture");
Activate();
GL.FramebufferTexture2D(FramebufferTarget.Framebuffer,
FramebufferAttachment.ColorAttachment0 + index,
texture.Target, texture.Name, 0);
Finish();
}
private void InitTextures()
{
var i = byte.MaxValue + 1;
var perm2 = new byte[i, i, 4];
for (var y = 0; y < i; y++)
{
for (var x = 0; x < i; x++)
{
var a = _perm[x] + y;
perm2[y, x, 0] = (byte)_perm[a];
perm2[y, x, 1] = (byte)_perm[a + 1];
var b = _perm[x + 1] + y;
perm2[y, x, 2] = (byte)_perm[b];
perm2[y, x, 3] = (byte)_perm[b + 1];
}
}
_perm2D = new Texture2D(i, i, 4, typeof(byte));
_perm2D.Activate();
GL.TexSubImage2D(TextureTarget.Texture2D, 0, 0, 0, i, i, PixelFormat.Rgba, PixelType.Byte, perm2);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
_permGrad3 = new Texture1D(i, 3, typeof(OpenTK.Half));
var pg3 = _perm.SelectMany(x => new[]
{
(float)_grad3[x % 16, 0],
(float)_grad3[x % 16, 1],
(float)_grad3[x % 16, 2],
}).ToArray();
_permGrad3.Activate();
GL.TexSubImage1D(TextureTarget.Texture1D, 0, 0, i, PixelFormat.Rgb, PixelType.Float, pg3);
GL.TexParameter(TextureTarget.Texture1D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Nearest);
GL.TexParameter(TextureTarget.Texture1D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Nearest);
GL.TexParameter(TextureTarget.Texture1D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
}
protected DebugShader()
{
_debugTex = Texture2D.FromFile(@"E:\SLSharp\IIS.SLSharp.Examples.GeoClipmap\debug.png");
Link();
}
