<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/99102>99102</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Implement the `GetRenderTargetSampleCount` HLSL Function
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            metabug,
            backend:DirectX,
            HLSL,
            bot:HLSL
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          farzonl
      </td>
    </tr>
</table>

<pre>
    - [ ] Implement `GetRenderTargetSampleCount` clang builtin,
- [ ] Link `GetRenderTargetSampleCount` clang builtin with `hlsl_intrinsics.h`
- [ ] Add sema checks for `GetRenderTargetSampleCount` to `CheckHLSLBuiltinFunctionCall` in `SemaChecking.cpp`
- [ ] Add codegen for `GetRenderTargetSampleCount` to `EmitHLSLBuiltinExpr` in `CGBuiltin.cpp`
- [ ] Add codegen tests to `clang/test/CodeGenHLSL/builtins/GetRenderTargetSampleCount.hlsl`
- [ ] Add sema tests to `clang/test/SemaHLSL/BuiltIns/GetRenderTargetSampleCount-errors.hlsl`
- [ ] Create the `int_dx_GetRenderTargetSampleCount` intrinsic in `IntrinsicsDirectX.td`
- [ ] Create the `DXILOpMapping` of `int_dx_GetRenderTargetSampleCount` to  `77` in `DXIL.td`
- [ ] Create the `GetRenderTargetSampleCount.ll` and `GetRenderTargetSampleCount_errors.ll` tests in `llvm/test/CodeGen/DirectX/`

## DirectX

| DXIL Opcode | DXIL OpName | Shader Model | Shader Stages |
| ----------- | ----------- | ------------ | ------------- |
| 77 | RenderTargetGetSampleCount | 6.0 | ('pixel',) |

## SPIR-V

There is no support for `GetRenderTargetSampleCount` when targeting SPIR-V.

## Test Case(s)

 
 ### Example 1
```hlsl
//dxc GetRenderTargetSampleCount_test.hlsl -T lib_6_8 -enable-16bit-types -O0

[numthreads(1, 1, 1)]
[shader("pixel")]
uint fn( ) : SV_Target {

        return GetRenderTargetSampleCount();
}
```
## HLSL:

Gets the number of samples for a render target.



| *UINT* GetRenderTargetSampleCount() |
|-------------------------------------|



 

## Parameters



| Item | Description |
|--------------------------------------------------------------------------------------|-------------|
| <span id="None"></span><span id="none"></span><span id="NONE"></span>None<br/> |             |



 

## Return Value

The number of samples.

## Remarks

Use this function and [**GetRenderTargetSamplePosition**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-getrendertargetsampleposition.md) to find out the number and position of the sampling locations for a render target.

## Minimum Shader Model

This function is supported in the following shader models.



| Shader Model | Supported |
|---------------------------------------------------------------------|-----------|
| [Shader Model 4](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm4.md) and higher shader models | yes       |
| [Shader Model 3 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm3.md) | no        |
| [Shader Model 2 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm2.md) | no        |
| [Shader Model 1 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm1.md) | no        |



 

## See also

<dl> <dt>

[**Intrinsic Functions (DirectX HLSL)**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-intrinsic-functions.md)
</dt> </dl>
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzMWMtu27wSfhp6Q8iwKcuyFl44cpwTIJeizl90F1DSWOKJRAok1aTn6Q-GlG-NayfAD7SCcxE5nG_mmwtJc2NEKQHmJLoi0XLAO1spPd9w_T8l60Gmip_zgJLoipJoSW-btoYGpKVkOroB-xVkAfqJ6xLsmuNkqjppyXRE85rLkmadqK2QhKVktNjruRPy5ZMq6KuwFa6palM_C2m1kEbkZliR6ehI-aIoqIGG07yC_MXQjdKXsaxCmRRX_OdufXflQVedzK1QMuV1jVJCotQaGu4khSyHedueMiBXBZQgPwN-3Qh7gH391uo9ZnrTD18CtGCs6TU6Aglb4Rhhq1QVcAMSMQhb9bwawla_t26IbP-W4DNYyFEP5Ay_vQAUgNZKm5N4qQZugdoKEEhI-1y8PZ9ndJcfPX23u3xZCg25_T60xXmY5ffbu8f2nretkCWqVJsPo1tFUTaO9_FDdRcxz8TB5x-XxXm5555GL-7j4w2o6x_Nu1QgbNXzQdjK24YfFhIW0u2MH4tTij7QxxYzjR68P_DGv68rXoCm96qA-nBgbXkJBkd6RcH-oRfe3w8EB4ri2E0fknFzxIebng5H7i9hM8LiVrxBTViMPYklW2U7r9dfbr8G3_zQUwUaqDBUKmq6tlXafqygXyusRDcjZNnrHB7hPIGxNOUGCJsZwhI_Sd2Pk0Ch6zenl45xdjryH1ciqGdF2Kp4y-mZdMBwu5qiwROtRfY8fZ7RACTPagjG00zYwP5swdDgcRv86Ep2ja008MIQNhsTltLtr4RESy9jXGgdo6xnlO3mOyEt3UjCZtRRHC7o-tuzt46S-KpHGiUabKflGQccQEJCtyReHtKwp9L1mdCrXNwAtqQKqOyaDDSWrXH6_EbAqXZIfXS2MdnlOGGLf24fnghbXLRqn4fBR559ou0ivXfhC9e8AQva_GrQrYXGVxuYXIsWt6NPIn_6-VXxvuBImJqWSyoKEi4JYw9KAkY-vCZhStgKJ_3LkZj8mNjD48P1CTEHEqaZxpQPrx0bh89ZZr_6FPvG6w52Vf0-OYa_LGq4fulj8Y_BBi0M3fSnAd-GoyvCFoQtTqbJF2UEinoRrAo2q6xtDeapK9xS2KrLhrnCrnwvcq2M2tilynGffBUyZLhH1yrDIvejBZgXq9rA6Lwvftehw8J1BOwFQal5W4ncBDgUlGB9tvtk9662vWnDpsAktopuhCyo6uxh2aCLW0mkCafceuxntco5TpwtKc_kvZCi6ZqjvWEbhkNKhdl2WChwx0K8japr9YqAvtvQBlebdzX7ft_Zafp3C-VYz0FVRFdHNkz-VMBNM-nDivGrRFmBPibP8fMTzHHpnPAhxO2yPwL4Duu7-59xK-zdQkulohetZ3-V9eyT1o__KuvH56w_3XTXAJTXRvWDYVrUrnGHaWGxu29PGr497g7ndHvfMqcI-KOtdHehCLYty3havH-4xPYu4v_o7qCYh0USJnwA83HMxuMoiSfRoJpvsnycRCGLi3gcbyZsWsQwzWAym3LOGJsNxJyN2GQUj6fjJIom0TACFic8CpNJloUTPiGTETRc1EM81Q-VLgfCmA7mSTIesUHNM6iNu9Ez1oDlWVe641lKGMt4_gKyIOFid_LvZzzPWzFlSbjYDkXLgZ4jVpB1pSGTUS2MNXt0K2wN8_23AxfvM3hIRuW7iA86Xc_PhLW_vjgbWq3-CzleY5zXGE_v-I85-38AAAD__6L8DaU">