I have coded up a simple core 4.3 program to draw a cubic Bezier curve. The input in the app program is 4 control points, the fineness of the approximating polyline is controlled by a uniform in the TCS which sets gl_TessLevelOuter, while the TES defines the polyline via “layout( isolines, equal_spacing ) in”.
So far, so good. The approximating polyline comes out fine. But I want to draw the control points as large points as well. How to do this? The TCS and TES are set up to draw polylines so I have to bypass them (right?). I believe I know one way to do this, which is to create two separate pipelines with help of glBindProgramPipeline() calls.
But is this the right way to do this thing? Seems a bit of overkill.
Another incidental question: the latest red book seems to suggest the statement in the TES should be “layout( isolines, equal_spacing ) out” with “out” at the end. This doesn’t work for me. I need it to be “in” as in the 1st para above (following Bailey/Cunningham Graphics Shaders). So, is that a bug in the red book?
Thanks in advance,