WIP: Modernize Renderer

[tophyr]

Pull Request Type

• GitHub Workflow changes
• Documentation or Wiki changes
• Build and Dependency changes
• Runtime changes
  • Render changes
  • Audio changes
  • Input changes
  • Network changes
  • Other changes

Description

Modernize the Descent 3 renderer to use OpenGL 3 (GLES 3, eventually) and shaders.

Rendering behavior should be identical! Any difference should be considered a bug, unless discussed, determined to be acceptable, and specifically called out here.

This PR is a work in progress and will be rebased and rewritten often. As the code, documentation and commit descriptions mature, this will be made review-ready.

Current Status + Known Issues

• Boots and can enter Pilot Training mission on Mac. See Screenshots 1 & 2.
• Texture or lighting issues, seems dependent on ship orientation? See attached Screenshots, 3-8
• Polygon vertex order may need attention: GL_POLYGON was deprecated and GL_TRIANGLE_FAN is being used, but I don't think is quite the same thing.
  • Environment, at least, seems to render mostly fine however

Screenshots

1: Game Intro Screen

2: Pilot Training Mission

3: Lighting state changes?

4: Missing light on left side

5: Lighting or texture type change

6: Texture change - seems "simpler"

7: Wonky flat texture state? Repeatable by rotating ship 180* in Pilot Training mission

8

Related Issues

Tip of the hat to https://github.com/InsanityBringer/PiccuEngine

[tophyr]

Superceded by #527