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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2013 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*
*/
#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>
COGL_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_new_with_size:
* @ctx: A #CoglContext
* @width: The width of your atlased texture.
* @height: The height of your atlased texture.
* @internal_format: The format of the 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.
*
* <note>This call can fail if Cogl considers the given
* @internal_format 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 with
* no storage allocated yet or %NULL on failure and @error
* will be updated.
* Since: 1.16
* Stability: unstable
*/
CoglAtlasTexture *
cogl_atlas_texture_new_with_size (CoglContext *ctx,
int width,
int height,
CoglPixelFormat internal_format,
CoglError **error);
/**
* cogl_atlas_texture_new_from_file:
* @ctx: A #CoglContext
* @filename: the file to load
* @internal_format: The format of the texture
*
* Creates a #CoglAtlasTexture from an image file. A #CoglAtlasTexture
* represents a sub-region within one of Cogl's shared texture
* atlases.
*
* <note>This call can fail if Cogl considers the given
* @internal_format 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,
CoglPixelFormat internal_format,
CoglError **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
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
* format similar to the format of the source data will be used. The
* default blending equations of Cogl expect premultiplied color data;
* the main use of passing a non-premultiplied format here is if you
* have non-premultiplied source data and are going to adjust the blend
* mode (see cogl_material_set_blend()) or use the data for something
* other than straight blending.
* @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 #CoglError 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 call can fail if Cogl considers the given
* @internal_format 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,
CoglPixelFormat internal_format,
int rowstride,
const uint8_t *data,
CoglError **error);
/**
* cogl_atlas_texture_new_from_bitmap:
* @bmp: A #CoglBitmap
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
* format similar to the format of the source data will be used. The
* default blending equations of Cogl expect premultiplied color data;
* the main use of passing a non-premultiplied format here is if you
* have non-premultiplied source data and are going to adjust the blend
* mode (see cogl_material_set_blend()) or use the data for something
* other than straight blending.
* @error: A #CoglError to catch exceptional errors or %NULL
*
* 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.
*
* <note>This call can fail if Cogl considers the given
* @internal_format 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_bitmap (CoglBitmap *bmp,
CoglPixelFormat internal_format,
CoglError **error);
/**
* 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
*/
CoglBool
cogl_is_atlas_texture (void *object);
COGL_END_DECLS
#endif /* _COGL_ATLAS_TEXTURE_H_ */
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