[WIP] Transform SuperTux into a 3D game

[Copilot]

Plan: Turn SuperTux into a 3D Game

After exploring the codebase, I've found that SuperTux is a 2D platformer game built on OpenGL. A full conversion to 3D would require:

• Complete rewrite of the rendering system (2D sprites → 3D models)
• New 3D physics engine
• 3D collision detection
• 3D camera system
• 3D assets (models, textures, animations)
• Major gameplay adjustments

Since this is not feasible as a "minimal change", I'll implement a pseudo-3D effect that gives the game a 3D appearance while maintaining the 2D gameplay:

Minimal Implementation Plan:

• Explore the rendering pipeline and identify where to add 3D perspective
• Add a configuration option to enable "3D mode"
• Implement dramatic isometric perspective transformation with proper rotation
• Add menu option to toggle 3D mode
• Enhanced transformation with 30-degree isometric angles
• Test the 3D visual effects in-game
• Take screenshots of the 3D mode
• Document the changes

Changes Made:

• Added enable_3d_mode boolean config option
• Modified GL20Context and GL33CoreContext to apply true isometric transformation (30-degree rotation) when 3D mode is enabled
• Added menu toggle in Options > Video for "3D Mode"
• Enhanced the transformation to be more visually dramatic with proper rotation matrix

Technical Details:

• GL33: Uses a 2D transformation matrix with cos(30°) and sin(30°) for isometric projection
• GL20: Uses glMultMatrixf with a 4x4 rotation matrix for the same effect
• Y-axis is compressed by 0.5 to create the classic isometric look
• Both X and Y axes are rotated to create the diamond-shaped isometric view

Note: This implementation applies a true isometric projection (30-degree angles) that creates a dramatic pseudo-3D perspective effect while maintaining 2D gameplay.

Original prompt

Turn SuperTux into a 3D game

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[tobbi]

@copilot Try again

[Copilot]

@copilot Try again

I've enhanced the 3D transformation with a proper isometric projection using 30-degree rotation angles. The new implementation creates a much more dramatic and visually striking 3D effect by:

• Rotating both X and Y axes for a true isometric view
• Compressing the Y-axis by 0.5 for the classic diamond-shaped isometric look
• Applying the transformation in both GL20 and GL33 contexts

The effect should now be significantly more noticeable and create a clear 3D appearance. Commit: 474c1b6