public void Render(ShaderColorXY shader, RectangleF view, Size areaInPixels, TimeStamp offset)
{
if (_vbo.Length == 0)
{
return;
}
// TODO: this should be done in Add
// as the buffer will be reloaded for every frame.
// Not much data to be copied, but still unnecessary.
var lastVertex = _vbo[_vbo.Length - 1];
_vbo.AddVertex(float.MaxValue, lastVertex.Y);
_vbo.IndexFromLength();
_vbo.Reload();
shader.SetTranslateMatrix(Matrix4.Identity);
shader.SetShaderColor(LineColor);
var trsl = Matrix4.CreateTranslation(-offset.ToRate(SamplesPerSecond), 0, 0);
shader.SetTranslateMatrix(trsl);
GL.LineWidth(Selected ? 3.0f : 1.0f);
_vbo.DrawMode = BeginMode.LineStrip;
_vbo.BindAndDraw(shader);
GL.PointSize(Selected ? 8.0f : 6.0f);
_vbo.DrawMode = BeginMode.Points;
_vbo.BindAndDraw(shader);
_vbo.PopVertex();
}
protected void DrawGridLines()
{
_shader.SetShaderMatrix(
Matrix4.CreateOrthographicOffCenter(
0, 1,
(float)AxisY.VisibleMinimum,
(float)AxisY.VisibleMaximum,
-1, 1
)
);
_shader.SetTranslateMatrix(Matrix4.Identity);
_shader.SetShaderColor(Color.DarkGray);
GL.LineWidth(1.0f);
_gridLines.BindAndDraw(_shader);
}
public void Render(ShaderColorXY shader, RectangleF view, Size areaInPixels, TimeStamp offset)
{
var ringBuffer = _ringBuffer;
// y per pixel
var visibleY = -1 * view.Height / areaInPixels.Height;
// find an appropriate zoom level for current view
var level = -1;
var zoomFactor = areaInPixels.Width / (double)view.Width;
for (int i = _zoomLevels.Length - 1; i >= 0; i--)
{
if (zoomFactor < 1.0 / _zoomLevels[i])
{
level = i;
break;
}
}
if (_level != level)
{
System.Diagnostics.Debug.WriteLine("Level: " + level);
if (level == -1)
{
_ringBuffer.Length = _ringBuffer.Capacity;
SetX(1);
}
else
{
_ringBuffer.Length = _ringBuffer.Capacity / _zoomLevels[level];
SetXTriangles(_zoomLevels[level]);
}
_level = level;
}
// leftSample is the first sample that is visible in the current View.
// It will be shifted to the left though if it is older than the other signals.
// This must be corrected.
// So calculate the left sample index to be the one that sits on the reference time.
// fill GL buffer with visible samples
var shift = ((offset - Duration.Begin).AsSeconds() * SamplesPerSecond);
var leftSample = (int)((Math.Max(0, view.Left)) + shift);
// Now the sample count is no more correct. We have to subtract what we just added.
var sampleCount = FillBuffer(
level: level,
offset: leftSample / (level == -1 ? 1 : _zoomLevels[level]),
samples: (int)(Math.Max(0, view.Width + shift) / (level == -1 ? 1 : _zoomLevels[level]))
);
// Render
GL.BindBuffer(BufferTarget.ArrayBuffer, ringBuffer.VboX);
GL.EnableVertexAttribArray(shader.AttributeX);
GL.VertexAttribPointer(shader.AttributeX, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, ringBuffer.VboY);
GL.EnableVertexAttribArray(shader.AttributeY);
GL.VertexAttribPointer(shader.AttributeY, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, ringBuffer.Ebo);
shader.SetShaderColor(LineColor);
GL.LineWidth(Selected ? 3.0f : 1.0f);
var trsl = Matrix4.CreateTranslation((float)(leftSample + ((-offset.AsSeconds() + _currentTime.AsSeconds()) * SamplesPerSecond) - _signalBuffer.Length), 0, 0);
shader.SetTranslateMatrix(trsl);
if (level == -1)
{
GL.DrawElements(BeginMode.LineStrip, sampleCount, DrawElementsType.UnsignedInt, new IntPtr(0));
}
else
{
GL.DrawElements(BeginMode.TriangleStrip, sampleCount, DrawElementsType.UnsignedInt, new IntPtr(0));
}
if (level != -1)
{
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMax.VboX);
GL.EnableVertexAttribArray(shader.AttributeX);
GL.VertexAttribPointer(shader.AttributeX, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMax.VboY);
GL.EnableVertexAttribArray(shader.AttributeY);
GL.VertexAttribPointer(shader.AttributeY, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _ringBufferMax.Ebo);
shader.SetShaderColor(LineColor);
GL.LineWidth(Selected ? 3.0f : 1.0f);
trsl = Matrix4.CreateTranslation((float)(leftSample + ((-offset.AsSeconds() + _currentTime.AsSeconds()) * SamplesPerSecond) - _signalBuffer.Length), 0, 0);
shader.SetTranslateMatrix(trsl);
GL.DrawElements(BeginMode.LineStrip, sampleCount / 2, DrawElementsType.UnsignedInt, new IntPtr(0));
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMin.VboX);
GL.EnableVertexAttribArray(shader.AttributeX);
GL.VertexAttribPointer(shader.AttributeX, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMin.VboY);
GL.EnableVertexAttribArray(shader.AttributeY);
GL.VertexAttribPointer(shader.AttributeY, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _ringBufferMin.Ebo);
shader.SetShaderColor(LineColor);
GL.LineWidth(Selected ? 3.0f : 1.0f);
trsl = Matrix4.CreateTranslation((float)(leftSample + ((-offset.AsSeconds() + _currentTime.AsSeconds()) * SamplesPerSecond) - _signalBuffer.Length), 0, 0);
shader.SetTranslateMatrix(trsl);
GL.DrawElements(BeginMode.LineStrip, sampleCount / 2, DrawElementsType.UnsignedInt, new IntPtr(0));
}
}
public void Render(ShaderColorXY shader, RectangleF view, Size areaInPixels, TimeStamp offset)
{
// find an appropriate zoom level for current view
var level = -1;
var zoomFactor = areaInPixels.Width / (double)view.Width;
for (int i = _zoomLevels.Length - 1; i >= 0; i--)
{
if (zoomFactor < 1.0 / _zoomLevels[i])
{
level = i;
break;
}
}
if (_level != level)
{
if (level == -1)
{
SetX(1);
}
else
{
//SetX(_zoomLevels[level]);
SetXTriangles(_zoomLevels[level] / 2);
}
_level = level;
}
var leftSample = (int)(Math.Max(0, view.Left - Duration.Begin.ToRate(SamplesPerSecond)));
var sampleCount = FillBuffer(
level: level,
offset: leftSample / (level == -1 ? 1 : _zoomLevels[level]),
samples: (int)((Math.Max(0, view.Width)) / (level == -1 ? 1 : _zoomLevels[level]))
);
// Render
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBuffer.VboX);
GL.EnableVertexAttribArray(shader.AttributeX);
GL.VertexAttribPointer(shader.AttributeX, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBuffer.VboY);
GL.EnableVertexAttribArray(shader.AttributeY);
GL.VertexAttribPointer(shader.AttributeY, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _ringBuffer.Ebo);
shader.SetShaderColor(LineColor);
GL.LineWidth(Selected ? 3.0f : 1.0f);
var trsl = Matrix4.CreateTranslation(leftSample + Duration.Begin.ToRate(SamplesPerSecond), 0, 0);
shader.SetTranslateMatrix(trsl);
GL.DrawElements(BeginMode.LineStrip, sampleCount, DrawElementsType.UnsignedInt, new IntPtr(0));
if (level != -1)
{
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMax.VboX);
GL.EnableVertexAttribArray(shader.AttributeX);
GL.VertexAttribPointer(shader.AttributeX, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMax.VboY);
GL.EnableVertexAttribArray(shader.AttributeY);
GL.VertexAttribPointer(shader.AttributeY, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _ringBufferMax.Ebo);
shader.SetShaderColor(LineColor);
GL.LineWidth(Selected ? 3.0f : 1.0f);
trsl = Matrix4.CreateTranslation(leftSample + Duration.Begin.ToRate(SamplesPerSecond), 0, 0);
shader.SetTranslateMatrix(trsl);
GL.DrawElements(BeginMode.LineStrip, sampleCount / 2 - 1, DrawElementsType.UnsignedInt, new IntPtr(0));
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMin.VboX);
GL.EnableVertexAttribArray(shader.AttributeX);
GL.VertexAttribPointer(shader.AttributeX, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, _ringBufferMin.VboY);
GL.EnableVertexAttribArray(shader.AttributeY);
GL.VertexAttribPointer(shader.AttributeY, 1, VertexAttribPointerType.Float, false, 4, 0);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, _ringBufferMin.Ebo);
shader.SetShaderColor(LineColor);
GL.LineWidth(Selected ? 3.0f : 1.0f);
trsl = Matrix4.CreateTranslation(leftSample + Duration.Begin.ToRate(SamplesPerSecond), 0, 0);
shader.SetTranslateMatrix(trsl);
GL.DrawElements(BeginMode.LineStrip, sampleCount / 2, DrawElementsType.UnsignedInt, new IntPtr(0));
}
}