ENIGMA Development Environment

• Currently only works for the GL1 backend. Rationale: I provide a fallback for other platforms that renders convex polygons. I can add GL3 support easily, too.
• Uses a custom class (PolyVertex) in a list to buffer calls to polygon_vertex(). Rationale: Drawing all at once minimizes GL errors (not ending the polygon) and memory leaks (not freeing temp. vertices for tessellation).
• Uses software tessellation (GLU). Rationale: If we move to hardware tessellation, we can still use this code as a fallback for GL1 and possibly GL ES (with some hacking).
• draw_polygon*() functions are in Graphics_Systems, not a plugin. Rationale: Drawing complex polygons is needed for GM5, and is (I feel) substantially different from primitives (such as triangle fans) to warrant inclusion as a main feature.
• (If I made a mistake in the GLU tessellation code, please let me know. That would certainly qualify as deal-breaking.)

EDIT: the converter was from v4 to v5
I still have it

• I've duplicated functions like draw_rectangle(), since GM5 does not provide an "outline" parameter. JDI finds these duplicates just fine, but perhaps this affects argument validation?
• My duplicate draw_*() functions take pen_size into account and use draw_line_width() to mimic GM5 wide outlines.
• pen_color, brush_color and other "magic" global variables are added as top-level static variables in the plugin.
• draw_text_sprite() and draw_polygon*() were also implemented. These might be useful for other games, or they might be too niche, and should be left in the compat library.
• There are some outstanding issues on C++ keywords being used as variable names (e.g., "short") that will inevitably have to be addressed.