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Bug with projection matrix when rendering the cube #6

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silbinarywolf opened this issue Dec 16, 2023 · 1 comment

Contributor

silbinarywolf commented Dec 16, 2023

I'm aware this project isn't maintained now but I figured I'd track this bug in the project anyway incase someone else wanted to resolve it.

Details here:
hrydgard/ppsspp#17981 (comment)

OK, investigated this in RenderDoc.

The entire cube gets clipped away, I guess we're just very slightly off from what the real PSP is doing.

The reason this is happening is that there's a digit missing in the projection matrix, causing it to squish the cube flat against the Z=0 plane, so this cube will not depth test properly against anything else. The perspective projected texturing still works (if you pass the clipping) since the W coordinate is computed correctly.

Note how the third row (actually column, I believe, but viewed transposed) of the matrix is 0.0f. There should be at least one non-zero number in there.

Collaborator

IridescentRose commented Dec 18, 2023 •

edited

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Interesting bug; I think that's probably part of the depth range -- I will work on this project more when I have more time.

Edit: Very interesting -- I'll have to debug this in more depth.

IridescentRose mentioned this issue

Update to Zig 0.12.0 Nightly #8

Merged

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