SKImage ToImage(Texture2D texture)
{
// Taken form VL.Video.MediaFoundation
const int GL_TEXTURE_BINDING_2D = 0x8069;
var eglContext = renderContext.EglContext;
var eglImage = eglContext.CreateImageFromD3D11Texture(texture.NativePointer);
uint textureId = 0;
NativeGles.glGenTextures(1, ref textureId);
// We need to restore the currently bound texture (https://github.com/devvvvs/vvvv/issues/5925)
NativeGles.glGetIntegerv(GL_TEXTURE_BINDING_2D, out var currentTextureId);
NativeGles.glBindTexture(NativeGles.GL_TEXTURE_2D, textureId);
NativeGles.glEGLImageTargetTexture2DOES(NativeGles.GL_TEXTURE_2D, eglImage);
NativeGles.glBindTexture(NativeGles.GL_TEXTURE_2D, (uint)currentTextureId);
var description = texture.Description;
var colorType = GetColorType(description.Format);
var glInfo = new GRGlTextureInfo(
id: textureId,
target: NativeGles.GL_TEXTURE_2D,
format: colorType.ToGlSizedFormat());
var backendTexture = new GRBackendTexture(
width: description.Width,
height: description.Height,
mipmapped: false,
glInfo: glInfo);
var image = SKImage.FromTexture(
renderContext.SkiaContext,
backendTexture,
GRSurfaceOrigin.BottomLeft,
colorType,
SKAlphaType.Premul,
colorspace: SKColorSpace.CreateSrgb(),
releaseProc: _ =>
{
renderContext.MakeCurrent();
backendTexture.Dispose();
NativeGles.glDeleteTextures(1, ref textureId);
eglImage.Dispose();
texture.Dispose();
});
return(image);
}
public void CanConvertFromPointerToDescToTextureWithNewInfo()
{
// the custom struct to contain the info
var oldInfo = new GRGlTextureInfo
{
Id = 123,
Target = 456,
Format = 789
};
// pin it for the native code
var textureHandle = GCHandle.Alloc(oldInfo, GCHandleType.Pinned);
// use the very old desc
var textureDesc = new GRBackendTextureDesc
{
Width = 100,
Height = 100,
Config = GRPixelConfig.Rgba8888,
Flags = GRBackendTextureDescFlags.RenderTarget,
Origin = GRSurfaceOrigin.BottomLeft,
SampleCount = 246,
TextureHandle = textureHandle.AddrOfPinnedObject(),
};
// create the new texture
var texture = new GRBackendTexture(textureDesc);
// free up all resourcess
textureHandle.Free();
// make sure we kept the information
Assert.Equal(100, texture.Width);
Assert.Equal(100, texture.Height);
var newInfo = texture.GetGlTextureInfo();
Assert.Equal(oldInfo.Id, newInfo.Id);
Assert.Equal(oldInfo.Target, newInfo.Target);
Assert.Equal(GRPixelConfig.Rgba8888.ToGlSizedFormat(), newInfo.Format);
}
private void PrepareSkia()
{
// CONTEXT
// create the SkiaSharp context
var glInterface = GRGlInterface.CreateNativeGlInterface();
context = GRContext.Create(GRBackend.OpenGL, glInterface);
// TEXTURE
// the texture size
var textureSize = new SKSizeI(256, 256);
// create the OpenGL texture
textureId = GL.GenTexture();
GL.BindTexture(TextureTarget.Texture2D, textureId);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, textureSize.Width, textureSize.Height, 0, OpenTK.Graphics.OpenGL.PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
GL.BindTexture(TextureTarget.Texture2D, 0);
// create the SkiaSharp texture description
var textureInfo = new GRGlTextureInfo
{
Id = (uint)textureId,
Target = (uint)TextureTarget.Texture2D
};
var textureHandle = GCHandle.Alloc(textureInfo, GCHandleType.Pinned);
textureDesc = new GRBackendTextureDesc
{
Width = textureSize.Width,
Height = textureSize.Height,
Config = GRPixelConfig.Rgba8888,
Flags = GRBackendTextureDescFlags.RenderTarget,
Origin = GRSurfaceOrigin.TopLeft,
SampleCount = 0,
TextureHandle = textureHandle.AddrOfPinnedObject(),
};
// create the SkiaSharp texture surface
textureSurface = SKSurface.CreateAsRenderTarget(context, textureDesc);
// free the pinned GC handle when we are done
textureHandle.Free();
// initialize the texture content
UpdateTexture(false);
// RENDER TARGET
// create the SkiaSharp render target description
renderDesc = new GRBackendRenderTargetDesc
{
RenderTargetHandle = (IntPtr)0,
Width = Width,
Height = Height,
Config = GRPixelConfig.Rgba8888,
Origin = GRSurfaceOrigin.TopLeft,
SampleCount = 0,
StencilBits = 0,
};
// create the SkiaSharp render target surface
renderSurface = SKSurface.Create(context, renderDesc);
}
