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. |