我有一个 IDS ueye cam 并通过 PBO 继续捕获到 OpenGL (OpenTK)。在我的开发人员 PC 上效果很好,但在速度较慢的机器上,视频会在一段时间后冻结。
通过 opengl 分配内存并映射到 ueye 的代码,因此相机将处理后的图像保存在此处:
// Generate PBO and save id
GL.GenBuffers(1, out this.frameBuffer[i].BufferID);
// Define the type of the buffer.
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, this.frameBuffer[i].BufferID);
// Define buffer size.
GL.BufferData(BufferTarget.PixelUnpackBuffer, new IntPtr(width * height * depth), IntPtr.Zero, BufferUsageHint.StreamDraw);
// Get pointer to by openGL allocated buffer and
// lock global with uEye.
this.frameBuffer[i].PointerToNormalMemory = GL.MapBuffer(BufferTarget.PixelUnpackBuffer, BufferAccess.WriteOnly);
this.frameBuffer[i].PointerToLockedMemory = uEye.GlobalLock(this.frameBuffer[i].PointerToNormalMemory);
// Unmap PBO after use.
GL.UnmapBuffer(BufferTarget.PixelUnpackBuffer);
// Set selected PBO to none.
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, 0);
// Register buffer to uEye
this.Succeeded("SetAllocatedImageMem", this.cam.SetAllocatedImageMem(width, height, depth, this.frameBuffer[i].PointerToLockedMemory, ref this.frameBuffer[i].MemId));
// Add buffer to uEye-Ringbuffer
this.Succeeded("AddToSequence", this.cam.AddToSequence(this.frameBuffer[i].PointerToLockedMemory, this.frameBuffer[i].MemId));
要将图像从 pbo 复制到纹理(已创建纹理并且可以):
// Select PBO with new video image
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, nextBufferId);
// Select videotexture as current
GL.BindTexture(TextureTarget.Texture2D, this.videoTextureId);
// Copy PBO to texture
GL.TexSubImage2D(
TextureTarget.Texture2D,
0,
0,
0,
nextBufferSize.Width,
nextBufferSize.Height,
OpenTK.Graphics.OpenGL.PixelFormat.Bgr,
PixelType.UnsignedByte,
IntPtr.Zero);
// Release Texture
GL.BindTexture(TextureTarget.Texture2D, 0);
// Release PBO
GL.BindBuffer(BufferTarget.PixelUnpackBuffer, 0);
也许有人可以看到错误......大约 6 秒后,ueye 事件不再提供任何图像。当我删除 TexSubImage2D 它运行良好,但当然没有图像出现。是否有来自opengl的锁或其他东西?在此先感谢 - 托马斯