Constructor

CoglAttributenew_const_4f

Declaration [src]

CoglAttribute*
cogl_attribute_new_const_4f (
  CoglContext* context,
  const char* name,
  float component0,
  float component1,
  float component2,
  float component3
)

Description [src]

Creates a new, 4 component, attribute whose value remains constant across all the vertices of a primitive without needing to duplicate the value for each vertex.

The constants (component0, component1, component2, constant3) represent a 4 component float vector which should have a corresponding declaration in GLSL code like:

[| attribute vec4 name; |]

unless one of the built in names “cogl_color_in”, “cogl_tex_coord0_in or “cogl_tex_coord1_in” etc is being used where no explicit GLSL declaration need be made.

Parameters

context

Type: CoglContext

A CoglContext.

The data is owned by the caller of the function.
name

Type: const char*

The name of the attribute (used to reference it from GLSL)

The data is owned by the caller of the function.
The value is a NUL terminated UTF-8 string.
component0

Type: float

The first component of a 4 component vector.

component1

Type: float

The second component of a 4 component vector.

component2

Type: float

The third component of a 4 component vector.

component3

Type: float

The fourth component of a 4 component vector.

Return value

Type: CoglAttribute

A newly allocated CoglAttribute representing the given constant vector.

The caller of the function takes ownership of the data, and is responsible for freeing it.