### Method

# Clutter ShaderEffect set_uniform

#### Declaration [src]

    void
    clutter_shader_effect_set_uniform (
      ClutterShaderEffect* effect,
      const gchar* name,
      GType gtype,
      gsize n_values,
      ...
    )

#### Description [src]

Sets a list of values as the payload for the uniform `name` inside the shader effect

The `gtype` must be one of: `G_TYPE_INT`, for 1 or more integer values; `G_TYPE_FLOAT`, for 1 or more floating point values; `CLUTTER_TYPE_SHADER_INT`, for a pointer to an array of integer values; `CLUTTER_TYPE_SHADER_FLOAT`, for a pointer to an array of floating point values; and `CLUTTER_TYPE_SHADER_MATRIX`, for a pointer to an array of floating point values mapping a matrix

The number of values interpreted is defined by the `n_value` argument, and by the `gtype` argument. For instance, a uniform named “sampler0” and containing a single integer value is set using:

      clutter_shader_effect_set_uniform (effect, "sampler0",
                                         G_TYPE_INT, 1,
                                         0);

While a uniform named “components” and containing a 3-elements vector of floating point values (a “vec3”) can be set using:

      gfloat component_r, component_g, component_b;

      clutter_shader_effect_set_uniform (effect, "components",
                                         G_TYPE_FLOAT, 3,
                                         component_r,
                                         component_g,
                                         component_b);

or can be set using:

      gfloat component_vec[3];

      clutter_shader_effect_set_uniform (effect, "components",
                                         CLUTTER_TYPE_SHADER_FLOAT, 3,
                                         component_vec);

Finally, a uniform named “map” and containing a matrix can be set using:

      float v[16];

      cogl_matrix_to_float (&matrix, v);
      clutter_shader_effect_set_uniform (effect, "map",
                                         CLUTTER_TYPE_SHADER_MATRIX,
                                         1, v);

This method is not directly available to language bindings.

#### Parameters

`name`

  Type: `const gchar*`

  The name of the uniform to set.

  The data is owned by the caller of the function.
  The value is a NUL terminated UTF-8 string.

`gtype`

  Type: `GType`

  The type of the uniform to set.

`n_values`

  Type: `gsize`

  The number of values.

`...`

  Type: ``

  A list of values.