# shz_mat4x4_blend

Source: https://sh4zam.com/api/matrix/shz_mat4x4_blend/

```c
SHZ_INLINE void shz_mat4x4_blend(shz_mat4x4_t* dst, const shz_mat4x4_t* matrix, float weights) SHZ_NOEXCEPT;
```

Adds and accumulates a scaled 4x4 matrix into the given matrix.

## Parameters

| Name | Type | Description |
| --- | --- | --- |
| `dst` | `shz_mat4x4_t *` |  |
| `matrix` | `const shz_mat4x4_t *` |  |
| `weights` | `float` |  |

## Returns

Nothing (`void`).

## Details

Each component of `joint_matrix` will be multiplied by `weight`, with the result being added to the existing value of that component in `dst`.

This is useful for accumulating weighted joint matrices onto an initially zeroed-out matrix.

## Warnings

- This routine clobbers XMTRX.

## 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:** [`shz::mat4x4::blend`](https://sh4zam.com/api/cpp/mat4x4/#blend)
- **Type-generic form:** none
- **Back-ends:** SH4: shared C implementation · SW: portable C · SPU: shared C implementation
- **Defined in:** [`sh4zam/shz_matrix.h:879`](https://github.com/gyrovorbis/sh4zam/blob/ba1e30c88d49df0311870b229e1dd860ef26c477/include/sh4zam/shz_matrix.h#L879)
- **Module:** [Matrix](https://sh4zam.com/api/matrix/), section "Miscellaneous"

## See also

[`shz_mat4x4_init_zero`](https://sh4zam.com/api/matrix/shz_mat4x4_init_zero/)