The test results you have selected are very old and may not represent the current state of Wine.
Selected Test Results (selected in 'Test Results' table below)
GP4 barely runs with only wireframe graphics, i.e. the textures are generally missing.
GP4 runs extremely slowly so the game isn't functional.
What does not
GP4 isn't functionally usable.
What was not tested
My testing was done with the latest git pulls of xf86-video-ati, drm, and mesa on a 2.6.32 kernel.
At this point, it's surprising this game runs at all on the open-source driver for a Radeon RV630. I'm sure GP4 would run fairly nicely on fglrx or nVidia's binary driver although I haven't test the latter two configurations.
Admin note: rating changed to conform to the rating definitions.