public virtual CVOpenGLESTexture LumaTextureForPixelBuffer(CVPixelBuffer pixelBuffer)
{
CVOpenGLESTexture lumaTexture = null;
CVReturn err;
if (VideoTextureCache == null)
{
Console.Error.WriteLine("No video texture cache");
return(lumaTexture);
}
// Periodic texture cache flush every frame
VideoTextureCache.Flush(0);
// CVOpenGLTextureCacheCreateTextureFromImage will create GL texture optimally from CVPixelBufferRef.
// UV
lumaTexture = VideoTextureCache.TextureFromImage(pixelBuffer, true, All.RedExt, pixelBuffer.Width, pixelBuffer.Height, All.RedExt, DataType.UnsignedByte, 0, out err);
if (lumaTexture == null || err != CVReturn.Success)
{
Console.Error.WriteLine("Error at creating luma texture using CVOpenGLESTextureCacheCreateTextureFromImage: " + err.ToString());
}
return(lumaTexture);
}
public void DisplayPixelBuffer(CVImageBuffer imageBuffer)
{
// First check to make sure we have a FrameBuffer to write to.
if (frameBuffer == 0)
{
var success = CreateFrameBuffer();
if (!success)
{
Console.WriteLine("Problem initializing OpenGL buffers.");
return;
}
}
if (videoTextureCache == null)
{
Console.WriteLine("Video Texture Cache not initialized");
return;
}
if (!(imageBuffer is CVPixelBuffer pixelBuffer))
{
Console.WriteLine("Could not get Pixel Buffer from Image Buffer");
return;
}
// Create a CVOpenGLESTexture from the CVImageBuffer
var frameWidth = (int)pixelBuffer.Width;
var frameHeight = (int)pixelBuffer.Height;
using (var texture = videoTextureCache.TextureFromImage(imageBuffer, true, All.Rgba, frameWidth, frameHeight, All.Bgra, DataType.UnsignedByte, 0, out CVReturn ret))
{
if (texture == null || ret != CVReturn.Success)
{
Console.WriteLine("Could not create Texture from Texture Cache");
return;
}
GL.BindTexture(texture.Target, texture.Name);
// Set texture parameters
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, frameBuffer);
// Set the view port to the entire view
GL.Viewport(0, 0, renderBufferWidth, renderBufferHeight);
var squareVerticies = new float[, ]
{
{ -1.0F, -1.0F },
{ 1.0F, -1.0F },
{ -1.0F, 1.0F },
{ 1.0F, 1.0F }
};
// The texture verticies are setup such that we flip the texture vertically.
// This is so that our top left origin buffers match OpenGL's bottom left texture coordinate system.
var textureSamplingRect = TextureSamplingRectForCroppingTextureWithAspectRatio(new CGSize(frameWidth, frameHeight), Bounds.Size);
var textureVertices = new float[, ]
{
{ (float)textureSamplingRect.Left, (float)textureSamplingRect.Bottom },
{ (float)textureSamplingRect.Right, (float)textureSamplingRect.Bottom },
{ (float)textureSamplingRect.Left, (float)textureSamplingRect.Top },
{ (float)textureSamplingRect.Right, (float)textureSamplingRect.Top }
};
// Draw the texture on the screen with OpenGL ES 2
RenderWithSquareVerticies(squareVerticies, textureVertices);
GL.BindTexture(texture.Target, texture.Name);
// Flush the CVOpenGLESTexture cache and release the texture
videoTextureCache.Flush(CVOptionFlags.None);
}
}
public void DisplayPixelBuffer(CVPixelBuffer pixelBuffer)
{
DrawTextInCorner(pixelBuffer);
CVReturn error;
if (pixelBuffer != null)
{
int frameWidth = (int)pixelBuffer.Width;
int frameHeight = (int)pixelBuffer.Height;
if (videoTextureCache == null)
{
Console.WriteLine("No video texture cache");
return;
}
CleanUpTextures();
CVAttachmentMode attachmentMode;
var colorAttachments = pixelBuffer.GetAttachment <NSString> (CVImageBuffer.YCbCrMatrixKey, out attachmentMode);
if (colorAttachments == CVImageBuffer.YCbCrMatrix_ITU_R_601_4)
{
preferredConversion = colorConversion601;
}
else
{
preferredConversion = colorConversion709;
}
GL.ActiveTexture(TextureUnit.Texture0);
lumaTexture = videoTextureCache.TextureFromImage(pixelBuffer, true, All.RedExt, frameWidth, frameHeight,
All.RedExt, DataType.UnsignedByte, 0, out error);
if (lumaTexture == null)
{
Console.WriteLine("Error at CVOpenGLESTextureCach.TextureFromImage");
}
GL.BindTexture(lumaTexture.Target, lumaTexture.Name);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
GL.ActiveTexture(TextureUnit.Texture1);
chromaTexture = videoTextureCache.TextureFromImage(pixelBuffer, true, All.RgExt, frameWidth / 2, frameHeight / 2,
All.RgExt, DataType.UnsignedByte, 1, out error);
if (chromaTexture == null)
{
Console.WriteLine("Error at CVOpenGLESTextureCach.TextureFromImage");
}
GL.BindTexture(chromaTexture.Target, chromaTexture.Name);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, frameBufferHandle);
GL.Viewport(0, 0, backingWidth, backingHeight);
}
GL.ClearColor(0f, 0f, 0f, 1f);
GL.Clear(ClearBufferMask.ColorBufferBit);
GL.UseProgram(Program);
GL.Uniform1(uniforms [(int)UniformIndex.RotationAngle], 0f);
GL.UniformMatrix3(uniforms [(int)UniformIndex.ColorConversionMatrix], 1, false, preferredConversion);
CGRect vertexSamplingRect = AVUtilities.WithAspectRatio(Bounds, PresentationRect);
var normalizedSamplingSize = new CGSize(0f, 0f);
var cropScaleAmount = new CGSize(vertexSamplingRect.Width / Bounds.Width, vertexSamplingRect.Height / Bounds.Height);
if (cropScaleAmount.Width > cropScaleAmount.Height)
{
normalizedSamplingSize.Width = 1f;
normalizedSamplingSize.Height = cropScaleAmount.Height / cropScaleAmount.Width;
}
else
{
normalizedSamplingSize.Width = 1f;
normalizedSamplingSize.Height = cropScaleAmount.Width / cropScaleAmount.Height;
}
float[] quadVertexData =
{
-1f * (float)normalizedSamplingSize.Width, -1f * (float)normalizedSamplingSize.Height,
(float)normalizedSamplingSize.Width, -1f * (float)normalizedSamplingSize.Height,
-1f * (float)normalizedSamplingSize.Width, (float)normalizedSamplingSize.Height,
(float)normalizedSamplingSize.Width, (float)normalizedSamplingSize.Height,
};
GL.VertexAttribPointer((int)AttributeIndex.Vertex, 2, VertexAttribPointerType.Float, false, 0, quadVertexData);
GL.EnableVertexAttribArray((int)AttributeIndex.Vertex);
var textureSamplingRect = new CGRect(0, 0, 1, 1);
float[] quadTextureData =
{
(float)textureSamplingRect.GetMinX(), (float)textureSamplingRect.GetMaxY(),
(float)textureSamplingRect.GetMaxX(), (float)textureSamplingRect.GetMaxY(),
(float)textureSamplingRect.GetMinX(), (float)textureSamplingRect.GetMinY(),
(float)textureSamplingRect.GetMaxX(), (float)textureSamplingRect.GetMinY()
};
GL.VertexAttribPointer((int)AttributeIndex.TextureCoordinates, 2, VertexAttribPointerType.Float, false, 0, quadTextureData);
GL.EnableVertexAttribArray((int)AttributeIndex.TextureCoordinates);
GL.DrawArrays(BeginMode.TriangleStrip, 0, 4);
GL.BindRenderbuffer(RenderbufferTarget.Renderbuffer, colorBufferHandle);
context.PresentRenderBuffer((int)RenderbufferTarget.Renderbuffer);
}
