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 FillTriangles(MultiPartTessResult multipartTessResult, int index, Drawing.Color color)
{
SetCurrent();
CheckViewMatrix();
//--------------------------------------------
u_solidColor.SetValue((float)color.R / 255f, (float)color.G / 255f, (float)color.B / 255f, (float)color.A / 255f);
//--------------------------------------------
//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.
VertexBufferObject vbo = multipartTessResult.GetVBO();
int subPathCount = multipartTessResult.PartCount;
vbo.Bind();
PartRange p = multipartTessResult.GetPartRange(index);
a_position.LoadLatest(p.beginVertexAt * 4); //*4 => see note (A) above, so offset => beginVertexAt * sizeof(float)
GL.DrawElements(BeginMode.Triangles,
p.elemCount,
DrawElementsType.UnsignedShort,
p.beginElemIndexAt * 2); //*2 => see note (A) above, so offset=> beginElemIndexAt *sizeof(ushort)
vbo.UnBind();
}
public void FillTriangles(VertexBufferObject vbo, int nelements, Drawing.Color color)
{
SetCurrent();
CheckViewMatrix();
//--------------------------------------------
u_solidColor.SetValue((float)color.R / 255f, (float)color.G / 255f, (float)color.B / 255f, (float)color.A / 255f);
vbo.Bind();
a_position.LoadLatest();
GL.DrawElements(BeginMode.Triangles, nelements, DrawElementsType.UnsignedShort, 0);
vbo.UnBind(); //important, call unbind after finish call.
}
public void Bind()
{
_vbo.Bind();
}
