File: INFO.md

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<!---======================= begin_copyright_notice ============================

Copyright (C) 2020-2021 Intel Corporation

SPDX-License-Identifier: MIT

============================= end_copyright_notice ==========================-->

 

## Opcode

  INFO = 0x70

## Format

| | | | | |
| --- | --- | --- | --- | --- |
| 0x70(INFO) | Op | Exec_size | Surface | LOD | Dst |


## Semantics




    Returns information about the surface

## Description



    <exec_size>*4 elements are returned in RGBA order with the format described below. Only the enabled pixels are written to in <dst>.

    **Return format for resinfo:**

        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | Surface type   | R                                  | G                                    | B                | A          |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | 1D             | (Width+1)>>LOD                     | 0                                    | 0                | MIPCount   |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | 1D_array       | (Width+1)>>LOD                     | Depth+1                              | 0                | MIPCount   |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | 2D             | ((Width+1)>>LOD)*(QuiltWidth+1)    | ((Height+1)>>LOD)*(QuiltHeight+1)    | 0                | MIPCount   |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | 2D_array       | ((Width+1)>>LOD)*(QuiltWidth+1)    | ((Height+1)>>LOD)*(QuiltHeight+1)    | Depth+1          | MIPCount   |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | 3D             | (Width+1)>>LOD                     | (Height+1)>>LOD                      | (Depth+1)>>LOD   | MIPCount   |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+
        | CUBE           | Buffer size                        | (Height+1)>>LOD                      | Depth+1          | MIPCount   |
        +----------------+------------------------------------+--------------------------------------+------------------+------------+

    Return format for sampleinfo:

        +----------------+---------------------+-------+-------+---------------------------------+
        | Surface type   | R                   | G     | B     | A                               |
        +----------------+---------------------+-------+-------+---------------------------------+
        | 2D             | Number of samples   | N/A   | N/A   | Sample position palette index   |
        +----------------+---------------------+-------+-------+---------------------------------+

- **Op(ub):** 
 
  - Bit[4..0]: encodes the sampler operation
 
    - 0b01010:  resinfo 
    - 0b01011:  sampleinfo
- **Exec_size(ub):** Execution size
 
  - Bit[2..0]: size of the region for source and destination operands
 
    - 0b011:  8 elements 
    - 0b100:  16 elements 
  - Bit[7..4]: execution mask (explicit control over the enabled channels)
 
    - 0b0000:  M1 
    - 0b0001:  M2 
    - 0b0010:  M3 
    - 0b0011:  M4 
    - 0b0100:  M5 
    - 0b0101:  M6 
    - 0b0110:  M7 
    - 0b0111:  M8 
    - 0b1000:  M1_NM 
    - 0b1001:  M2_NM 
    - 0b1010:  M3_NM 
    - 0b1011:  M4_NM 
    - 0b1100:  M5_NM 
    - 0b1101:  M6_NM 
    - 0b1110:  M7_NM 
    - 0b1111:  M8_NM
- **Surface(ub):** Index of the surface variable

- **LOD(raw_operand):** The LOD parameter. The field is present only for resinfo. Must have type UD

- **Dst(raw_operand):** results of the sampler operation. Must have type UD

#### Properties


## Text
```
    



RESINFO (exec_size) <surface> <lod> <dst>

SAMPLEINFO (exec_size) <surface> <dst>
```



## Notes