Fix GL Error Invalid Enum

[bqc0n]

What

Fixes this:

 ########## GL ERROR ##########
 @ Post render
 1280: Invalid enum

Implementation Details

This is caused in the logic for getting GL11.GL_SHADE_MODEL in CRenderUtils. The buffer version is bit shifted to the left by 8 bits, leading to the invalid enum. If actual value is GL11.GL_FLAT (0x0x1D00), then shadeModel variable will be 0x1D0000.

Therefore, you should use GL11.glGetInteger(GL11.GL_SHADE_MODEL) instead of buffer version.

Outcome

No more GL ERROR spam.

[Copilot]

Pull Request Overview

This PR fixes an OpenGL error "Invalid enum" caused by incorrect bit shifting when retrieving GL state values using buffer-based OpenGL calls. The issue was causing GL ERROR spam during rendering.

Key changes:

• Replace buffer-based GL state retrieval with direct glGetInteger calls
• Remove unnecessary buffer allocations and imports
• Add explanatory comment about the bit shifting issue

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[soramame0256]

lgtm