private void Initialize(TextureParams textureParams)
{
compressed = Format.IsCompressed();
GLHelper.GetGLTextureFormat(Context, Format, out GLInternalFormat, out GLFormat, out GLPixelType);
GLTexture = GL.GenTexture();
GLHelper.CheckGLErrors();
GL.ActiveTexture(TextureUnit.Texture0);
GLHelper.CheckGLErrors();
GL.BindTexture(TextureTarget.Texture2D, GLTexture);
GLHelper.CheckGLErrors();
for (var level = 0; level < LevelCount; level++)
{
GraphicsUtility.CalculateMipLevelSize(level, Width, Height, out var levelWidth, out var levelHeight);
if (compressed)
{
var imageSize = GraphicsUtility.CalculateImageDataSize(Format, levelWidth, levelHeight);
GL.CompressedTexImage2D(TextureTarget.Texture2D, level, (PixelInternalFormat)GLInternalFormat,
levelWidth, levelHeight, 0, imageSize, IntPtr.Zero);
GLHelper.CheckGLErrors();
}
else
{
GL.TexImage2D(TextureTarget.Texture2D, level, (PixelInternalFormat)GLInternalFormat,
levelWidth, levelHeight, 0, (PixelFormat)GLFormat, (PixelType)GLPixelType, IntPtr.Zero);
GLHelper.CheckGLErrors();
}
}
UpdateTextureParams(textureParams);
Context.InvalidateTextureBinding(0);
}
public void ReadPixels(Format format, int x, int y, int width, int height, IntPtr pixels)
{
GLHelper.GetGLTextureFormat(Context, format, out _, out var glDstFormat, out var glDstType);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, GLFramebuffer);
GLHelper.CheckGLErrors();
GL.ReadPixels(x, y, width, height, (PixelFormat)glDstFormat, (PixelType)glDstType, pixels);
GLHelper.CheckGLErrors();
Context.InvalidateRenderTargetBinding();
}