Getting Gratuitous Tank Battles to run on my laptop November 10, 2011 cliffski So…. it runs! and it runs in places at 60FPS, but in other places….not. My dell video card has a 64MB VRAM intel GMA chipset, so hardly a gaming laptop, but my aim was to get GTB to at least run on it, even if the framerate sucked. That way, I know people with 128MB or 256MB cards should be fine, and I’d like to keep the min spec as low as I can. The game already had a ton of stuff you could turn off, such as shadows, shaders etc, but running it on the Dell, and then profiling it using the awesome free intel GMA tools showed up a ton of stuff that I could do to increase the initial 20FPS rate. These were: Realise that the refresh rate on the dell was set at 40FPS not 60FPS initally, hence making an artificially low limit. DOH! Removing a redundant Clear() at the start of each frame. I fill the screen anyway, so why bother? I don’t use a Z-buffer. Removing some render-target sets and clears when the shader options were turned off. With these off, I can render direct to the back buffer, old-school style and save time on render target changes. Adding code that detects a jpg when loaded, and mip-maps it. Previously, they had no mip maps at all. Could possibly reduce some memory consumption Add a graphical detail slider to options which can turn off a bunch of frilly details like window shadows, and drifting smoke on menu screens. Providing a separate list of lower-res textures that get used in some cases when the graphical detail slider is below 25%. Such as mech legs and the shadow maps for scenarios. Any texture of 2048 or higher gets a lower res replacement. I had tried auto-scaling them on load, but this gave unexplained errors and I don’t trust D3DX to do this reliably on all video cards to be honest, so separate low-res textures it is. I think the biggest wins were the texture-size reductions and the removal of the render target clears. It was interesting to note that the dell considered the game to be GPU limited, despite it being a fairly old and crappy chip (and only a single core). I guess at 1920×1200 res with all the options on for the desktop, things may be very different though. Things may start to race ahead from here. The game is definitely very playable in its basic form, with the majority of extra work now likely to be the online challenge and integration stuff. That will take months, but still, the end is definitely in sight.