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librender: Proper homogenous clipping #68

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jbush001 opened this issue Jun 23, 2017 · 2 comments
Open

librender: Proper homogenous clipping #68

jbush001 opened this issue Jun 23, 2017 · 2 comments
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@jbush001
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Currently the perspective transform does not divide z by w. The view volume is z (-1.0 -> -inf), which is nonstandard and will break non-floating point depth buffers.

http://fabiensanglard.net/polygon_codec/
http://research.microsoft.com/pubs/73937/p245-blinn.pdf
http://www.cs.unc.edu/~olano/papers/2dh-tri/
http://www.songho.ca/opengl/gl_projectionmatrix.html
@jbush001 jbush001 mentioned this issue Jun 23, 2017
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@jbush001
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Also properly perform guard band clipping against all planes (currently is only near)

duvitech-llc pushed a commit to duvitech-llc/NyuziProcessor that referenced this issue Jan 14, 2018
@jbush001
Add a few options to fix csmith test host incompatibilities
985d1c2 
- Disable packed structs, since Nyuzi doesn't support unaligned accesses
- Disable 64-bit types, per issue jbush001#68. Since my 64-bit host has a different
  size for (long int), this could result in different conversions.

[ci skip]
@jbush001
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jbush001 commented Apr 1, 2018

Here is clipping code in the SwiftShader project (this is done on polygons instead of triangles, but the concepts should be similar):

https://github.com/google/swiftshader/blob/master/src/Renderer/Clipper.cpp

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