Create Retna3D

[Thugga369]

Retania

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Summary of Changes

Hello @Thugga369, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new GLSL fragment shader, 'Retna3D', which is designed to apply a specific visual distortion to rendered images. The shader processes an input texture, applying a horizontal shift exclusively to the bottom half of the image. This shift gradually increases towards the bottom edge, creating a unique and dynamic visual effect.

Highlights

• New Shader File: A new GLSL fragment shader file named 'Retna3D' has been added to the repository.
• Visual Distortion Effect: The shader implements a unique visual distortion effect that horizontally shifts the bottom 50% of an input texture.
• Ramping Shift: The horizontal shift applied by the shader smoothly increases from zero at the image's mid-point (y=0.5) to a maximum value at the very bottom edge (y=1.0).

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