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Merge pull request #29 from Colin-Suckow/master 

Add missing texpage to polygon command
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Nicolas Noble 2021-11-25 08:28:43 -08:00 committed by GitHub
parent 7ab8576bc3 59034cbacb
commit 08f7f8df4d
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1 changed files with 8 additions and 6 deletions
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14
docs/graphicsprocessingunitgpu.md
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@ -161,13 +161,15 @@ attached to it, as well as a CLUT index.
So each vertex data can be seen as the following set of words:
```
Color xxBBGGRR - optional, only present for gouraud shading
Vertex YYYYXXXX - required, two signed 16 bits values
UV ClutUUVV - optional, only present for textured polygons
Color xxBBGGRR - optional, only present for gouraud shading
Vertex YYYYXXXX - required, two signed 16 bits values
UV ClutUUVV or PageUUVV - optional, only present for textured polygons
```
The Clut index is only relevant for the first vertex seen in the stream of data. Any
further Clut index ought to be set to 0.
The upper 16 bits of the first two UV words contain extra information. The first
word holds the [Clut index](#clut-attribute-color-lookup-table-aka-palette). The second word contains [texture page information](#texpage-attribute-parameter-for-textured-polygons-commands).
Any further clut/page bits should be set to 0.
So for example, a solid flat blue triangle of coordinate (10, 20), (30, 40), (50, 60)
will be drawn using the following draw call data:
@ -185,7 +187,7 @@ Yyy1Xxx1
ClutU1V1
00R2G2B2
Yyy2Xxx2
0000U2V2
PageU2V2
00R3G3B3
Yyy3Xxx3
0000U3V3