mutter/cogl/cogl/cogl-atlas-texture.h
Niels De Graef 70bacb9402 cogl: Remove CoglError wrapper
CoglError was added at a certain point to remove the hard dependency on
GLib, but since this can't be avoided inside mutter, let's remove this
whole abstraction.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/631
2019-06-20 18:25:04 +02:00

255 lines
9.1 KiB
C

/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2013 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*
*/
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef _COGL_ATLAS_TEXTURE_H_
#define _COGL_ATLAS_TEXTURE_H_
#include <cogl/cogl-context.h>
#include <glib-object.h>
G_BEGIN_DECLS
/**
* SECTION:cogl-atlas-texture
* @short_description: Functions for managing textures in Cogl's global
* set of texture atlases
*
* A texture atlas is a texture that contains many smaller images that
* an application is interested in. These are packed together as a way
* of optimizing drawing with those images by avoiding the costs of
* repeatedly telling the hardware to change what texture it should
* sample from. This can enable more geometry to be batched together
* into few draw calls.
*
* Each #CoglContext has an shared, pool of texture atlases that are
* are managed by Cogl.
*
* This api lets applications upload texture data into one of Cogl's
* shared texture atlases using a high-level #CoglAtlasTexture which
* represents a sub-region of one of these atlases.
*
* <note>A #CoglAtlasTexture is a high-level meta texture which has
* some limitations to be aware of. Please see the documentation for
* #CoglMetaTexture for more details.</note>
*/
typedef struct _CoglAtlasTexture CoglAtlasTexture;
#define COGL_ATLAS_TEXTURE(tex) ((CoglAtlasTexture *) tex)
/**
* cogl_atlas_texture_get_gtype:
*
* Returns: a #GType that can be used with the GLib type system.
*/
GType cogl_atlas_texture_get_gtype (void);
/**
* cogl_atlas_texture_new_with_size:
* @ctx: A #CoglContext
* @width: The width of your atlased texture.
* @height: The height of your atlased texture.
*
* Creates a #CoglAtlasTexture with a given @width and @height. A
* #CoglAtlasTexture represents a sub-region within one of Cogl's
* shared texture atlases.
*
* 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.
*
* 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().
*
* <note>Allocate call can fail if Cogl considers the internal
* format to be incompatible with the format of its internal
* atlases.</note>
*
* <note>The returned #CoglAtlasTexture is a high-level meta-texture
* with some limitations. See the documentation for #CoglMetaTexture
* for more details.</note>
*
* Returns: (transfer full): A new #CoglAtlasTexture object.
* Since: 1.16
* Stability: unstable
*/
CoglAtlasTexture *
cogl_atlas_texture_new_with_size (CoglContext *ctx,
int width,
int height);
/**
* cogl_atlas_texture_new_from_file:
* @ctx: A #CoglContext
* @filename: the file to load
* @error: A #GError to catch exceptional errors or %NULL
*
* Creates a #CoglAtlasTexture from an image file. A #CoglAtlasTexture
* represents a sub-region within one of Cogl's shared texture
* atlases.
*
* 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.
*
* 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().
*
* <note>Allocate call can fail if Cogl considers the internal
* format to be incompatible with the format of its internal
* atlases.</note>
*
* <note>The returned #CoglAtlasTexture is a high-level meta-texture
* with some limitations. See the documentation for #CoglMetaTexture
* for more details.</note>
*
* Return value: (transfer full): A new #CoglAtlasTexture object or
* %NULL on failure and @error will be updated.
* Since: 1.16
* Stability: unstable
*/
CoglAtlasTexture *
cogl_atlas_texture_new_from_file (CoglContext *ctx,
const char *filename,
GError **error);
/**
* cogl_atlas_texture_new_from_data:
* @ctx: A #CoglContext
* @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 start of each
* row in @data. A value of 0 will make Cogl automatically
* calculate @rowstride from @width and @format.
* @data: pointer to the memory region where the source buffer resides
* @error: A #GError to catch exceptional errors or %NULL
*
* Creates a new #CoglAtlasTexture texture based on data residing in
* memory. A #CoglAtlasTexture represents a sub-region within one of
* Cogl's shared texture atlases.
*
* <note>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_atlas_texture_new_from_bitmap() or use
* cogl_atlas_texture_new_with_size() and then upload data using
* cogl_texture_set_data()</note>
*
* <note>Allocate call can fail if Cogl considers the internal
* format to be incompatible with the format of its internal
* atlases.</note>
*
* <note>The returned #CoglAtlasTexture is a high-level
* meta-texture with some limitations. See the documentation for
* #CoglMetaTexture for more details.</note>
*
* Return value: (transfer full): A new #CoglAtlasTexture object or
* %NULL on failure and @error will be updated.
* Since: 1.16
* Stability: unstable
*/
CoglAtlasTexture *
cogl_atlas_texture_new_from_data (CoglContext *ctx,
int width,
int height,
CoglPixelFormat format,
int rowstride,
const uint8_t *data,
GError **error);
/**
* cogl_atlas_texture_new_from_bitmap:
* @bitmap: A #CoglBitmap
*
* Creates a new #CoglAtlasTexture texture based on data residing in a
* @bitmap. A #CoglAtlasTexture represents a sub-region within one of
* Cogl's shared texture atlases.
*
* 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().
*
* <note>Allocate call can fail if Cogl considers the internal
* format to be incompatible with the format of its internal
* atlases.</note>
*
* <note>The returned #CoglAtlasTexture is a high-level meta-texture
* with some limitations. See the documentation for #CoglMetaTexture
* for more details.</note>
*
* Returns: (transfer full): A new #CoglAtlasTexture object.
* Since: 1.16
* Stability: unstable
*/
CoglAtlasTexture *
cogl_atlas_texture_new_from_bitmap (CoglBitmap *bmp);
/**
* cogl_is_atlas_texture:
* @object: a #CoglObject
*
* Checks whether the given object references a #CoglAtlasTexture
*
* Return value: %TRUE if the passed object represents an atlas
* texture and %FALSE otherwise
*
* Since: 1.16
* Stability: Unstable
*/
gboolean
cogl_is_atlas_texture (void *object);
G_END_DECLS
#endif /* _COGL_ATLAS_TEXTURE_H_ */