7.4 Depth Source
There is an internal color register in the RDP called the primitive color. A similar thing can be done with the Z value, setting a uniform depth for the entire primitive. This value is called the primitive depth. By using the primitive depth, you can render texture rectangles at a specific depth.
The primitive depth is set using the gDPSetPrimDepth command, which takes the Z value and the DeltaZ value as arguments.
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| gDPSetPrimDepth(Gfx *gdl, s32 z, s32 dz) |
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gdl |
-- |
Display list pointer |
| z |
-- |
Z value |
| dz |
-- |
DeltaZ value |
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Use the gDPSetDepthSource command to update the Z value input source for Z values computed during rendering. When you specify G_ZS_PIXEL as the source in this command, the Z value of the polygon is utilized. When you specify G_ZS_PRIM, the primitive depth is utilized.
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| gDPSetDepthSource(Gfx *gdl, u32 source) |
| |
gdl |
-- |
Display list pointer |
| source |
-- |
Depth source value |
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G_ZS_PIXEL (Use each pixel's Z value and DeltaZ value) |
| G_ZS_PRIM (Use primitive depth register's Z value and DeltaZ value) |
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