Texture Filtering Image Quality - No Aniso
Given the furore over NV3x's image quality, especially in relation to texture filtering, analysis of NV40's texture filtering is prudent. The driver is compared in both Quality and Performance modes to determine what effect, if any, the Performance mode has on texture filtering image quality.No anisotropic filtering
FilterTest - Quality - No Aniso - Click for full size .png (~1MB)
FilterTest - Performance - No Aniso - Click for full size .png (~1MB)
Serious Sam - Quality - No Aniso - Click for full size .png (~2.37MB)
Serious Sam - Performance - No Aniso - Click for full size .png (~2.37MB)
Serious Sam - Comparison - No Aniso
Initial quality with no anisotropic filtering seems good, with a full trilinear filter apparently being used to filter all the texture stages. The comparison Serious Sam image shows the difference between Performance (on the left) and Quality (on the right) modes. Changes between mipmap levels are filtered slightly differently. It's hard to spot in static images without the help of something like Compressonator, but in motion in the game, mipmap stage changes show up as slight texture aliasing which is more apparent in Performance mode. Initial quality seems good and remember trilinear optimisations are off.
