public void DrawTriangleStrips(MultiPartTessResult multipartTessResult, int index, PixelFarm.Drawing.Color color)
{
////note (A):
////from https://www.khronos.org/registry/OpenGL-Refpages/es2.0/xhtml/glVertexAttribPointer.xml
////... If a non-zero named buffer object is bound to the GL_ARRAY_BUFFER target (see glBindBuffer)
////while a generic vertex attribute array is specified,
////pointer is treated as **a byte offset** into the buffer object's data store.
SetCurrent();
CheckViewMatrix();
//--------------------
u_solidColor.SetValue((float)color.R / 255f, (float)color.G / 255f, (float)color.B / 255f, (float)color.A / 255f);
_shareRes.AssignStrokeColorToVar(u_solidColor);
//because original stroke width is the width of both side of
//the line, but u_linewidth is the half of the strokeWidth
u_linewidth.SetValue(_shareRes._strokeWidth / 2f);
//--------------------
VertexBufferObject borderVBO = multipartTessResult.GetBorderVBO();
borderVBO.Bind();
BorderPart p = multipartTessResult.GetBorderPartRange(index);
//get part range from border part
int borderSetIndex = p.beginAtBorderSetIndex;
for (int i = 0; i < p.count; ++i)
{
PartRange borderset = multipartTessResult.GetSmoothBorderPartRange(borderSetIndex + i);
a_position.LoadLatest(borderset.beginVertexAt * 4);
GL.DrawArrays(BeginMode.TriangleStrip, 0, borderset.elemCount);
}
borderVBO.UnBind(); //unbind
}
public void EndBorderPart()
{
//add to list
BorderPart borderPart = new BorderPart();
borderPart.beginAtBorderSetIndex = _currentBorderPartBeginAt;
borderPart.count = smoothBorders.Count - _currentBorderPartBeginAt;
_borderParts.Add(borderPart);
}