public static GLTexture HorizontalJoin(GLTexture left, GLTexture right)
{
Exceptions.CheckArgumentNull(left, "left");
Exceptions.CheckArgumentNull(right, "right");
if (left.Height != right.Height)
{
throw new ArgumentException("height");
}
if (!left.PixelFormat.Equals(right.PixelFormat))
{
throw new ArgumentException("pixelFormat");
}
int height = left.Height;
PixelFormatDescriptor format = left.PixelFormat;
GLTexture texture = null;
try
{
using (GLService.AcquireContext())
{
texture = new GLTexture(GL.GenTexture(), left.Width + right.Width, height, format);
GL.BindTexture(TextureTarget.Texture2D, texture.Id);
GL.TexImage2D(TextureTarget.Texture2D, 0, format, texture.Width, texture.Height, 0, format, format, IntPtr.Zero);
if (GLService.CheckVersion(4, 3))
{
GL.CopyImageSubData(left.Id, ImageTarget.Texture2D, 0, 0, 0, 0, texture.Id, ImageTarget.Texture2D, 0, 0, 0, 0, left.Width, left.Height, 1);
GL.CopyImageSubData(right.Id, ImageTarget.Texture2D, 0, 0, 0, 0, texture.Id, ImageTarget.Texture2D, 0, left.Width, 0, 0, right.Width, right.Height, 1);
}
else
{
using (GLFramebuffer framebuffer = GLFramebuffer.Create())
{
GL.BindFramebuffer(FramebufferTarget.Framebuffer, framebuffer.Id);
GL.FramebufferTexture2D(FramebufferTarget.DrawFramebuffer, FramebufferAttachment.ColorAttachment1, TextureTarget.Texture2D, texture.Id, 0);
GL.FramebufferTexture2D(FramebufferTarget.ReadFramebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2D, left.Id, 0);
GL.DrawBuffer(DrawBufferMode.ColorAttachment1);
GL.BlitFramebuffer(0, 0, left.Width, height, 0, 0, left.Width, height, ClearBufferMask.ColorBufferBit, BlitFramebufferFilter.Linear);
GL.FramebufferTexture2D(FramebufferTarget.ReadFramebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2D, right.Id, 0);
GL.DrawBuffer(DrawBufferMode.ColorAttachment1);
GL.BlitFramebuffer(0, 0, left.Width, height, left.Width, 0, left.Width * 2, height, ClearBufferMask.ColorBufferBit, BlitFramebufferFilter.Linear);
}
}
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
}
}
catch
{
texture.SafeDispose();
throw;
}
return(texture);
}
public static void HorizontalSplit(GLTexture layer, out GLTexture leftTexture, out GLTexture rightTexture)
{
Exceptions.CheckArgumentNull(layer, "layer");
if (layer.Width % 2 != 0)
{
throw new ArgumentException("layer.Width");
}
int width = layer.Width / 2;
int height = layer.Height;
PixelFormatDescriptor format = layer.PixelFormat;
leftTexture = null;
rightTexture = null;
try
{
using (GLService.AcquireContext())
{
leftTexture = new GLTexture(GL.GenTexture(), width, height, format);
rightTexture = new GLTexture(GL.GenTexture(), width, height, format);
foreach (GLTexture texture in new[] { leftTexture, rightTexture })
{
GL.BindTexture(TextureTarget.Texture2D, texture.Id);
GL.TexImage2D(TextureTarget.Texture2D, 0, format, width, height, 0, format, format, IntPtr.Zero);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
}
if (GLService.CheckVersion(4, 3))
{
GL.CopyImageSubData(layer.Id, ImageTarget.Texture2D, 0, 0, 0, 0, leftTexture.Id, ImageTarget.Texture2D, 0, 0, 0, 0, width, height, 1);
GL.CopyImageSubData(layer.Id, ImageTarget.Texture2D, 0, width, 0, 0, rightTexture.Id, ImageTarget.Texture2D, 0, 0, 0, 0, width, height, 1);
}
else
{
using (GLFramebuffer framebuffer = GLFramebuffer.Create())
{
GL.BindFramebuffer(FramebufferTarget.Framebuffer, framebuffer.Id);
GL.FramebufferTexture2D(FramebufferTarget.ReadFramebuffer, FramebufferAttachment.ColorAttachment0, TextureTarget.Texture2D, layer.Id, 0);
GL.FramebufferTexture2D(FramebufferTarget.DrawFramebuffer, FramebufferAttachment.ColorAttachment1, TextureTarget.Texture2D, leftTexture.Id, 0);
GL.DrawBuffer(DrawBufferMode.ColorAttachment1);
GL.BlitFramebuffer(0, 0, width, height, 0, 0, width, height, ClearBufferMask.ColorBufferBit, BlitFramebufferFilter.Linear);
GL.FramebufferTexture2D(FramebufferTarget.DrawFramebuffer, FramebufferAttachment.ColorAttachment1, TextureTarget.Texture2D, rightTexture.Id, 0);
GL.DrawBuffer(DrawBufferMode.ColorAttachment1);
GL.BlitFramebuffer(width, 0, width * 2, height, 0, 0, width, height, ClearBufferMask.ColorBufferBit, BlitFramebufferFilter.Linear);
}
}
}
}
catch
{
leftTexture.SafeDispose();
rightTexture.SafeDispose();
throw;
}
}