Test 3: Twiddle Bit Order (DIV-003 HIGH)

• 64x64 ARGB1555 texture with 4 colored quadrants
• Left: correct twiddle (Y-even, X-odd). Right: swapped (X-even, Y-odd)
• Hardware: right is scrambled. Flycast: may auto-correct both.

Test 4: Transparency Sort Order (DIV-004 MEDIUM-HIGH)

• 5 translucent planes at alpha=0.5
• Mode A: back-to-front (correct). Mode B: front-to-back (wrong)
• Hardware: different composites. Flycast: OIT makes both look same.