# shz_xmtrx_apply_store_4x4

Source: https://sh4zam.com/api/xmtrx/shz_xmtrx_apply_store_4x4/

> Multiplies XMTRX by the matrix, in, storing the result within the matrix, out

```c
SHZ_INLINE void shz_xmtrx_apply_store_4x4(shz_mat4x4_t* out, const shz_mat4x4_t* in) SHZ_NOEXCEPT;
```

Multiplies XMTRX by the matrix, `in`, storing the result within the matrix, `out`.

## Parameters

| Name | Type | Description |
| --- | --- | --- |
| `out` | `shz_mat4x4_t *` |  |
| `in` | `const shz_mat4x4_t *` |  |

## Returns

Nothing (`void`).

## Details

This routine is roughly equivalent to: [`shz_xmtrx_apply_4x4`](https://sh4zam.com/api/xmtrx/shz_xmtrx_apply_4x4/)(in); [`shz_xmtrx_store_4x4`](https://sh4zam.com/api/xmtrx/shz_xmtrx_store_4x4/)(out);

However, it has been optimized and pipelined for performing the multiply and store in parallel.

## Notes

- This is useful for when you want to multiply a batch of matrices by the same matrix, held within XMTRX.

## Warnings

- The result of the multiplication is not stored within XMTRX, despite it getting clobbered.

## Naming and requirements

- `shz_mat4x4_t` and `shz_mat2x2_t` arguments must be 8-byte aligned. Unaligned data goes through the `float[16]` parameters of the `_unaligned` routines.

## Availability

- **C++ equivalent:** none (call the C function from C++)
- **Type-generic form:** none
- **Back-ends:** SH4: dedicated SH4 implementation · SW: portable C · SPU: shared C implementation
- **Defined in:** [`sh4zam/shz_xmtrx.h:658`](https://github.com/gyrovorbis/sh4zam/blob/ba1e30c88d49df0311870b229e1dd860ef26c477/include/sh4zam/shz_xmtrx.h#L658)
- **Module:** [XMTRX](https://sh4zam.com/api/xmtrx/), section "Compound Operations"

## See also

[`shz_xmtrx_apply_4x4`](https://sh4zam.com/api/xmtrx/shz_xmtrx_apply_4x4/), [`shz_xmtrx_store_4x4`](https://sh4zam.com/api/xmtrx/shz_xmtrx_store_4x4/), [`shz_xmtrx_apply_store_unaligned_4x4`](https://sh4zam.com/api/xmtrx/shz_xmtrx_apply_store_unaligned_4x4/)