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The following input and output registers are implemented in the geometry shader version 5_0.
Input Registers
| Register Type | Count | R/W | Dimension | Indexable by r# | Defaults | Requires DCL |
|---|---|---|---|---|---|---|
| 32-bit Temp (r#) | 4096(r#+x#[n]) | R/W | 4 | No | None | Yes |
| 32-bit Indexable Temp Array (x#[n]) | 4096(r#+x#[n]) | R/W | 4 | Yes | None | Yes |
| 32-bit Input (v[vertex][element]) | 32 | R | 4(comp)*32(vert) | Yes | None | Yes |
| 32-bit Input Primitive ID (vPrim) | 1 | R | 1 | No | None | Yes |
| 32-bit Input Instance ID (vInstanceID) | 1 | R | 1 | No | None | Yes |
| Element in an input resource (t#) | 128 | R | 1 | No | None | Yes |
| Sampler (s#) | 16 | R | 1 | No | None | Yes |
| ConstantBuffer reference (cb#[index]) | 15 | R | 4 | Yes(contents) | None | Yes |
| Immediate ConstantBuffer reference (icb[index]) | 1 | R | 4 | Yes(contents) | None | Yes |
Output Registers
| Register Type | Count | R/W | Dimension | Indexable by r# | Defaults | Requires DCL |
|---|---|---|---|---|---|---|
| NULL (discard result, useful for ops with multiple results) | N/A | W | N/A | N/A | N/A | No |
| 32-bit output Vertex Data Element (o#) | 32 | W | N/A | N/A | 4 | Yes |
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