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shrub_renderer.md

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Shrub Renderer

Shrub Microprogram

Operation

The following operations are performed in seperate loops:

  1. Copy GIF tags to GS packet.
  2. Copy GS AD texture data to GS packet.
  3. Convert vertex positions to floats.
  4. Transform vertices and write to GS packet.

Memory Map

Address (quadwords) Size (quadwords) Description
0x0 0x2 Bookkeeping
0x2 0x76 Input Buffer 1
0x78 0x76 Input Buffer 2
0xee 0x11a Instances (x10)
0x208 0x1f8 Output Buffer

Data Structures

Input Buffer

The data written by the UNPACK commands stored in the shrub packets.

Offset (quadwords) Size (quadwords) Description
0 0x1 Header
1 gif_tag_count GIF tags
1 + gif_tag_count texture_count GS AD data
vertex_offset vertex_count Vertex Positions + offsets
vertex_offset + vertex_count vertex_count Vertex STs + colour indices + stopping condition

Instance

Offset (quadwords) Size (quadwords) Description
0x0 0x4 Instance Matrix
0x4 0x18 Colour Palette

Register Map

Integer Registers

Register Description Lifetime
vi11 Input buffer pointer. 1-4

Floating Point Registers

Register Description
vf17 Addresses to write GS packets.

Shrub Near Microprogram

Memory Map

Same as above.