| pEfx | INTEGER | Pointer to an ID3DXEffect interface |
| hParam | INTEGER | Handle of the matrix parameter. |
| m11# | FLOAT | the parameter's new m11 value |
| m12# | FLOAT | the parameter's new m12 value |
| m13# | FLOAT | the parameter's new m13 value |
| m14# | FLOAT | the parameter's new m14 value |
| m21# | FLOAT | the parameter's new m21 value |
| m22# | FLOAT | the parameter's new m22 value |
| m23# | FLOAT | the parameter's new m23 value |
| m24# | FLOAT | the parameter's new m24 value |
| m31# | FLOAT | the parameter's new m31 value |
| m32# | FLOAT | the parameter's new m32 value |
| m33# | FLOAT | the parameter's new m33 value |
| m34# | FLOAT | the parameter's new m34 value |
| m41# | FLOAT | the parameter's new m41 value |
| m42# | FLOAT | the parameter's new m42 value |
| m43# | FLOAT | the parameter's new m43 value |
| m44# | FLOAT | the parameter's new m44 value |