Registers - vs_2_x
This section contains reference information for the input and output registers implemented by vertex shader version 2_x.
Input Registers
| Register | Name | Count | R/W | # Read ports | # Reads / inst | Dimension | RelAddr | Defaults | Requires DCL |
|---|---|---|---|---|---|---|---|---|---|
| v# | Input Register | 16 | R | 1 | Unlimited | 4 | No | See note 1 | Yes |
| r# | Temporary Register | See note 2 | R/W | 3 | Unlimited | 4 | No | None | No |
| c# | Constant Float Register | See note 3 | R | 1 | 2 | 4 | a0 / aL | (0, 0, 0, 0) | No |
| a0 | Address Register | 1 | R/W | 1 | 2 | 4 | No | None | No |
| b# | Constant Boolean Register | 16 | R | 1 | 1 | 1 | No | FALSE | No |
| i# | Constant Integer Register | 16 | R | 1 | 1 | 4 | No | (0, 0, 0, 0) | No |
| aL | Loop Counter Register | 1 | R | 1 | 2 | 1 | No | None | No |
| p0 | Predicate Register | 1 | R/W | 1 | 1 | 4 | No | None | No |
Notes:
- Partial (0, 0, 0, 1) - If only a subset of channels are updated, the remaining channels will default to (0, 0, 0, 1).
- Equal to D3DCAPS9.VS20Caps.NumTemps (at least 12 for vs_2_x).
- Equal to D3DCAPS9.MaxVertexShaderConst (at least 256 for vs_2_x).
Output Registers
| Register | Name | Count | R/W | Dimension | RelAddr | Defaults | Requires DCL |
|---|---|---|---|---|---|---|---|
| oPos | Position Register | 1 | W | 4 | No | None | No |
| oFog | Fog Register | 1 | W | 1 | No | None | No |
| oPts | Point Size Register | 1 | W | 1 | No | None | No |
| oD# | Color Register; See note 1 | 2 | W | 4 | No | None | No |
| oT# | Texture Coordinate Register | 8 | W | 4 | No | None | No |
Notes:
- oD0 is the diffuse color output; oD1 is the specular color output.
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