3D textures

## 3D textures 3D textures — Functions for creating and manipulating 3D textures |

## Functions

CoglTexture3D * | cogl_texture_3d_new_with_size ()
CoglTexture3D * | cogl_texture_3d_new_from_data ()
CoglBool | cogl_is_texture_3d ()

## Description

These functions allow 3D textures to be used. 3D textures can be thought of as layers of 2D images arranged into a cuboid shape. When choosing a texel from the texture, Cogl will take into account the 'r' texture coordinate to select one of the images.

## Functions

### cogl_texture_3d_new_with_size ()

    CoglTexture3D *
    cogl_texture_3d_new_with_size (CoglContext *context,
                                   int width,
                                   int height,
                                   int depth);

Creates a low-level CoglTexture3D texture with the specified dimensions and pixel format.

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 preferably let Cogl automatically allocate storage lazily when it may know more about how the texture is going to be used and can optimize how it is allocated.

The texture is still configurable until it has been allocated so for example you can influence the internal format of the texture using `cogl_texture_set_components()` and `cogl_texture_set_premultiplied()`.

This texture will fail to allocate later if `COGL_FEATURE_ID_TEXTURE_3D` is not advertised. Allocation can also fail if the requested dimensions are not supported by the GPU.

#### Parameters

context | a CoglContext |
width | width of the texture in pixels. |
height | height of the texture in pixels. |
depth | depth of the texture in pixels. |

#### Returns

A new CoglTexture3D object with no storage yet allocated.

[transfer full]

Since 1.10

Stability Level: Unstable

### cogl_texture_3d_new_from_data ()

    CoglTexture3D *
    cogl_texture_3d_new_from_data (CoglContext *context,
                                   int width,
                                   int height,
                                   int depth,
                                   CoglPixelFormat format,
                                   int rowstride,
                                   int image_stride,
                                   const uint8_t *data,
                                   CoglError **error);

Creates a low-level 3D texture and initializes it with `data` . The data is assumed to be packed array of `depth` images. There can be padding between the images using `image_stride` .

This api will always immediately allocate GPU memory for the texture and upload the given data so that the `data` pointer does not need to remain valid once this function returns. This means it is not possible to configure the texture before it is allocated. If you do need to configure the texture before allocation (to specify constraints on the internal format for example) then you can instead create a CoglBitmap for your data and use `cogl_texture_3d_new_from_bitmap()`.

#### Parameters

context | a CoglContext |
width | width of the texture in pixels. |
height | height of the texture in pixels. |
depth | depth of the texture in pixels. |
format | the CoglPixelFormat the buffer is stored in in RAM |
rowstride | the memory offset in bytes between the starts of scanlines in `data` or 0 to infer it from the width and format |
image_stride | the number of bytes from one image to the next. This can be used to add padding between the images in a similar way that the rowstride can be used to add padding between rows. Alternatively 0 can be passed to infer the `image_stride` from the `height` . |
data | pointer the memory region where the source buffer resides |
error | A CoglError return location. |

#### Returns

the newly created CoglTexture3D or `NULL` if there was an error and an exception will be returned through `error` .

[transfer full]

Since 1.10

Stability Level: Unstable

### cogl_is_texture_3d ()

    CoglBool
    cogl_is_texture_3d (void *object);

Checks whether the given object references a CoglTexture3D

#### Parameters

object | a CoglObject |

#### Returns

`TRUE` if the passed object represents a 3D texture and `FALSE` otherwise

Since 1.4

Stability Level: Unstable

## Types and Values