Constructor
CoglAttributenew_const_2x2fv
Declaration [src]
CoglAttribute*
cogl_attribute_new_const_2x2fv (
CoglContext* context,
const char* name,
const float* matrix2x2,
gboolean transpose
)
Description [src]
Creates a new matrix attribute whose value remains constant across all the vertices of a primitive without needing to duplicate the value for each vertex.
matrix2x2
represent a square 2 by 2 matrix specified in
column-major order (each pair of consecutive numbers represents a
column) which should have a corresponding declaration in GLSL code like:
[| attribute mat2 name; |]
If transpose
is TRUE
then all matrix components are rotated
around the diagonal of the matrix such that the first column
becomes the first row and the second column becomes the second row.
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. matrix2x2
-
Type:
const float*
A pointer to a 2 by 2 matrix.
The data is owned by the caller of the function. transpose
-
Type:
gboolean
Whether the matrix should be transposed on upload or not.
Return value
Type: CoglAttribute
A newly allocated CoglAttribute
representing the given constant matrix.
The caller of the function takes ownership of the data, and is responsible for freeing it. |