War stories: how Crash Bandicoot hacked the original Playstation (2020)

Re:War stories: how Crash Bandicoot hacked the original Play... by Sohcahtoa82 on Monday December 20, 2021 @03:50PM (#29630119)

> GPUs, even the primitive PSX one, will draw many in a single CPU cycle. I can't find information on the PSX GPU fill rate but I'm sure it's faster than 1 pixel per CPU cycle.

GPUs do it via massive parallelization.

> DOOM didn't use the GPU to draw the walls/floors as triangles but did use the GPU to draw the scene as vertical strips. DOOM also relied on the 1Kbyte "scratchpad RAM" which was the CPU cache mapped into the address space and not subject to DMA delays.

In the days of DOOM, did the video card even offer any sort of acceleration? I was under the impression that all the texture scaling was done on the CPU. So while it rendered walls as vertical strips, it would still have to interpolate across the strip on the CPU.

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Re:War stories: how Crash Bandicoot hacked the original Play... by Narishma on Monday December 20, 2021 @07:21PM (#29632249)

There's a misunderstanding about which version of Doom people are talking about. I think you're talking about the PC version while the person you replied to was talking about the PS1 version.

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