Return to Castle Wolfenstein
RtCW is an OpenGL title, based on the venerable Quake3 engine.
| FPS | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| 1.0.0.233 | 98.2 | 98 | 92.4 | 68.4 | 50.0 |
| 1.2.0.42 | 83.5 | 82.7 | 78.0 | 63.9 | 49.4 |
| Difference | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| FPS | -14.7 | -15.3 | -14.4 | -4.5 | -0.6 |
| % | -15% | -16% | -16% | -7% | -1% |
Unlike the DirectX titles, the performance here appears to have sunk a little since the earlier drivers, with at worst a 16% drop in performance. With the current drivers, at 1024x768 the Parhelia is well above 60 FPS, but has dropped below it by 1600x1200 at just under 50 FPS.
| 1.2.0.42 | 640x480 | 800x600 | 1024x768 | 1280x1024 | 1600x1200 |
| Normal | 83.5 | 82.7 | 78.0 | 63.9 | 49.4 |
| 2X Aniso | 82.3 | 78.0 | 68.1 | 51.0 | 38.3 |
| 16X FAA | 80.7 | 75.5 | 65.6 | 47.1 | 34.8 |
| 2X Aniso + 16X FAA | 77.6 | 69.5 | 53.2 | 38.4 | 29.3 |
| % Difference | 640x480 | 800x600 | 1024x768 | 1280x960 | 1600x1200 |
| 2X Aniso | -1% | -6% | -13% | -20% | -22% |
| 16X FAA | -3% | -9% | -16% | -26% | -30% |
| 2X Aniso + 16X FAA | -7% | -16% | -32% | -40% | -41% |
Adding 2X Anisotropic filtering accounts for a worst case performance drop from normal rendering, although the performance is still above 60 FPS at 1024x768 on average, and above 30 FPS at 1600x1200. FAA accounts for a maximum performance penalty of 30% in high resolution, but again it's still above 60 FPS at 1024x768 and 30 FPS at 1600x1200. Adding both shows a further drop and this time it has sunk below 60 FPS at 1024x768 and just a little under 30 FPS at 1600x1200.
