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Description
These functions allow low-level 2D textures to be allocated. These differ from sliced textures for example which may internally be made up of multiple 2D textures, or atlas textures where Cogl must internally modify user texture coordinates before they can be used by the GPU.
You should be aware that many GPUs only support power of two sizes
for CoglTexture2D textures. You can check support for non power of
two textures by checking for the COGL_FEATURE_ID_TEXTURE_NPOT feature
via cogl_has_feature().
Functions
cogl_texture_2d_new_with_size ()
CoglTexture2D * cogl_texture_2d_new_with_size (CoglContext *ctx,int width,int height);
Creates a low-level CoglTexture2D texture with a given width
and
height
that your GPU can texture from directly.
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 being 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().
COGL_FEATURE_ID_TEXTURE_NPOT feature via
cogl_has_feature().Since: 2.0
cogl_texture_2d_new_from_file ()
CoglTexture2D * cogl_texture_2d_new_from_file (CoglContext *ctx,const char *filename,CoglError **error);
Creates a low-level CoglTexture2D texture from an image file.
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 being 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().
COGL_FEATURE_ID_TEXTURE_NPOT feature via
cogl_has_feature().Since: 1.16
cogl_texture_2d_new_from_bitmap ()
CoglTexture2D *
cogl_texture_2d_new_from_bitmap (CoglBitmap *bitmap);
Creates a low-level CoglTexture2D texture based on data residing in a CoglBitmap.
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 being 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().
COGL_FEATURE_ID_TEXTURE_NPOT feature via
cogl_has_feature().Since: 2.0
Stability Level: Unstable
cogl_texture_2d_new_from_data ()
CoglTexture2D * cogl_texture_2d_new_from_data (CoglContext *ctx,int width,int height,CoglPixelFormat format,int rowstride,const uint8_t *data,CoglError **error);
Creates a low-level CoglTexture2D texture based on data residing in memory.
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_2d_new_from_bitmap() or use
cogl_texture_2d_new_with_size() and then upload data using
cogl_texture_set_data()
COGL_FEATURE_ID_TEXTURE_NPOT feature via
cogl_has_feature().Parameters
ctx |
||
width |
width of texture in pixels |
|
height |
height of 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 |
pointer the memory region where the source buffer resides |
|
error |
A CoglError for exceptions |
Returns
A newly allocated CoglTexture2D, or if
the size is not supported (because it is too large or a
non-power-of-two size that the hardware doesn't support)
it will return NULL and set error
.
[transfer full]
Since: 2.0
cogl_texture_2d_gl_new_from_foreign ()
CoglTexture2D * cogl_texture_2d_gl_new_from_foreign (CoglContext *ctx,unsigned int gl_handle,int width,int height,CoglPixelFormat format);
Wraps an existing GL_TEXTURE_2D texture object as a CoglTexture2D. This can be used for integrating Cogl with software using OpenGL directly.
The texture is still configurable until it has been allocated so
for example you can declare whether the texture is premultiplied
with cogl_texture_set_premultiplied().
gl_handle
or if width or height don't have the correct texture
geometry.Parameters
ctx |
||
gl_handle |
A GL handle for a GL_TEXTURE_2D texture object |
|
width |
Width of the foreign GL texture |
|
height |
Height of the foreign GL texture |
|
format |
The format of the texture |
Since: 2.0
cogl_is_texture_rectangle ()
CoglBool
cogl_is_texture_rectangle (void *object);
Gets whether the given object references an existing CoglTextureRectangle object.