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<!---======================= begin_copyright_notice ============================
Copyright (C) 2020-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ==========================-->
## Opcode
SAMPLE_UNORM = 0x41
## Format
| | | | | | | |
| --- | --- | --- | --- | --- | --- | --- |
| 0x41(SAMPLE_UNORM) | Channel_mask | Sampler | Surface | U_offset | V_offset | DeltaU |
| | DeltaV | Dst | | | | |
## Semantics
Sample a UNORM surface
## Description
Samples an UNORM <surface> using the indicated sampler state.
- **Channel_mask(ub):**
- Bit[3..0]: determines the write masks for the RGBA channel, with R being bit 0 and A bit 3. At least one channel must be enabled (i.e., "0000" is not allowed).
- Bit[5..4]: is Output format control.
- 0b00: "16-bit full". Two bytes will be returned for each pixel
- 0b01: "16-bit chrominance downsampled". Like the previous one, except only even pixels are returned for R and B channels
- 0b10: "8-bit full". One byte is returned for each pixel
- 0b11: "8-bit chrominance downsampled". Like the previous one, except only even pixels are returned for R and B channels
- **Sampler(ub):** Index of the sampler variable
- **Surface(ub):** Index of the surface variable
- **U_offset(scalar):** the normalized x coordinate of pixel 0. Must have type F
- **V_offset(scalar):** the normalized y coordinate of pixel 0. Must have type F
- **DeltaU(scalar):** the difference in coordinates for adjacent pixels in the X direction. Must have type F
- **DeltaV(scalar):** the difference in coordinates for adjacent pixels in the Y direction. Must have type F
- **Dst(raw_operand):** The raw operand of a general variable storing the result of the sample. The variable must have 32 * num_enabled_channels elements, with the disabled channels skipped in the results. Must have type UW
#### Properties
- **SIMD Control Flow:** channel enable is ignored
## Text
```
SAMPLE_UNORM.<channel>.<output_format> <sampler> <surface> <u_offset> <v_offset> <deltaU> <deltaV> <dst>
//<output_format> is one of "16-full", "16-downsampled", "8-full", "8-downsampled"
```
## Notes
|
