Constructor

CoglTexture2DSlicednew_from_file

Declaration [src]

CoglTexture2DSliced*
cogl_texture_2d_sliced_new_from_file (
  CoglContext* ctx,
  const char* filename,
  int max_waste,
  GError** error
)

Description [src]

Creates a CoglTexture2DSliced from an image file.

A CoglTexture2DSliced may internally be comprised of 1 or more CoglTexture2D textures depending on GPU limitations. For example if the GPU only supports power-of-two sized textures then a sliced texture will turn a non-power-of-two size into a combination of smaller power-of-two sized textures. If the requested texture size is larger than is supported by the hardware then the texture will be sliced into smaller textures that can be accessed by the hardware.

max_waste is used as a threshold for recursively slicing the right-most or bottom-most slices into smaller sizes until the wasted padding at the bottom and right of the textures is less than specified. A negative max_waste will disable slicing.

The storage for the texture is not allocated before this function returns. You can call cogl_texture_allocate() to explicitly allocate the underlying storage or let Cogl automatically allocate storage lazily.

It’s possible for the allocation of a sliced texture to fail later due to impossible slicing constraints if a negative max_waste value is given. If the given virtual texture size is larger than is supported by the hardware but slicing is disabled the texture size would be too large to handle.

Available since:

1.16

Parameters

`ctx`	`CoglContext`
	A `CoglContext`.
	The data is owned by the caller of the function.
`filename`	`const char*`
	The file to load.
	The data is owned by the caller of the function.
	The string is a NUL terminated UTF-8 string.
`max_waste`	`int`
	The threshold of how wide a strip of wasted texels are allowed along the right and bottom textures before they must be sliced to reduce the amount of waste. A negative can be passed to disable slicing.
`error`	`GError **`
	The return location for a `GError*`, or `NULL`.

Return value

Returns:	`CoglTexture2DSliced`
	A newly created `CoglTexture2DSliced` or `NULL` on failure and `error` will be updated.
	The caller of the function takes ownership of the data, and is responsible for freeing it.