Draft: OpenGL portals

Based on !1773 (closed), merge that before merging this!

Visual portal (linedef type 40) support for OpenGL. Work in progress!

added Feature OpenGL renderer labels

added 1 commit

• f6638c0f - more work on hw portals

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added Unmergeable label

added 2694 commits

• f6638c0f...a8a92a57 - 2693 commits from branch STJr:next
• 48cddae9 - Merge branch 'next' into SRB2-hwportals

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removed Unmergeable label

added 1 commit

• a507dce8 - Fix build warning

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added Enhancement label

added 1 commit

• a3845620 - Fix gr_wireframe

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Closing this as it's been open for a very long time, while still being marked as a draft.

closed