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af7398788a
Texture allocation is now consistently handled lazily such that the internal format can now be controlled using cogl_texture_set_components() and cogl_texture_set_premultiplied() before allocating the texture with cogl_texture_allocate(). This means that the internal_format arguments to texture constructors are now redundant and since most of the texture constructors now can't ever fail the error arguments are also redundant. This now means we no longer use CoglPixelFormat in the public api for describing the internal format of textures which had been bad solution originally due to how specific CoglPixelFormat is which is missleading when we don't support such explicit control over the internal format. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 99a53c82e9ab0a1e5ee35941bf83dc334b1fbe87) Note: there are numerous API changes for functions currently marked as 'unstable' which we don't think are in use by anyone depending on a stable 1.x api. Compared to the original patch though this avoids changing the cogl_texture_rectangle_new_with_size() api which we know is used by Mutter.
241 lines
8.6 KiB
C
241 lines
8.6 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2013 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef _COGL_ATLAS_TEXTURE_H_
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#define _COGL_ATLAS_TEXTURE_H_
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#include <cogl/cogl-context.h>
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COGL_BEGIN_DECLS
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/**
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* SECTION:cogl-atlas-texture
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* @short_description: Functions for managing textures in Cogl's global
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* set of texture atlases
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*
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* A texture atlas is a texture that contains many smaller images that
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* an application is interested in. These are packed together as a way
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* of optimizing drawing with those images by avoiding the costs of
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* repeatedly telling the hardware to change what texture it should
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* sample from. This can enable more geometry to be batched together
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* into few draw calls.
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*
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* Each #CoglContext has an shared, pool of texture atlases that are
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* are managed by Cogl.
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*
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* This api lets applications upload texture data into one of Cogl's
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* shared texture atlases using a high-level #CoglAtlasTexture which
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* represents a sub-region of one of these atlases.
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*
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* <note>A #CoglAtlasTexture is a high-level meta texture which has
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* some limitations to be aware of. Please see the documentation for
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* #CoglMetaTexture for more details.</note>
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*/
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typedef struct _CoglAtlasTexture CoglAtlasTexture;
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#define COGL_ATLAS_TEXTURE(tex) ((CoglAtlasTexture *) tex)
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/**
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* cogl_atlas_texture_new_with_size:
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* @ctx: A #CoglContext
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* @width: The width of your atlased texture.
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* @height: The height of your atlased texture.
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*
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* Creates a #CoglAtlasTexture with a given @width and @height. A
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* #CoglAtlasTexture represents a sub-region within one of Cogl's
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* shared texture atlases.
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*
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* The storage for the texture is not allocated before this function
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* returns. You can call cogl_texture_allocate() to explicitly
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* allocate the underlying storage or let Cogl automatically allocate
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* storage lazily.
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*
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* The texture is still configurable until it has been allocated so
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* for example you can influence the internal format of the texture
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* using cogl_texture_set_components() and
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* cogl_texture_set_premultiplied().
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*
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* <note>Allocate call can fail if Cogl considers the internal
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* format to be incompatible with the format of its internal
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* atlases.</note>
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*
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* <note>The returned #CoglAtlasTexture is a high-level meta-texture
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* with some limitations. See the documentation for #CoglMetaTexture
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* for more details.</note>
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*
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* Returns: (transfer full): A new #CoglAtlasTexture object.
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* Since: 1.16
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* Stability: unstable
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*/
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CoglAtlasTexture *
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cogl_atlas_texture_new_with_size (CoglContext *ctx,
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int width,
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int height);
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/**
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* cogl_atlas_texture_new_from_file:
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* @ctx: A #CoglContext
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* @filename: the file to load
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* @error: A #CoglError to catch exceptional errors or %NULL
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*
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* Creates a #CoglAtlasTexture from an image file. A #CoglAtlasTexture
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* represents a sub-region within one of Cogl's shared texture
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* atlases.
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*
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* The storage for the texture is not allocated before this function
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* returns. You can call cogl_texture_allocate() to explicitly
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* allocate the underlying storage or let Cogl automatically allocate
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* storage lazily.
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*
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* The texture is still configurable until it has been allocated so
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* for example you can influence the internal format of the texture
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* using cogl_texture_set_components() and
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* cogl_texture_set_premultiplied().
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*
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* <note>Allocate call can fail if Cogl considers the internal
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* format to be incompatible with the format of its internal
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* atlases.</note>
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*
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* <note>The returned #CoglAtlasTexture is a high-level meta-texture
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* with some limitations. See the documentation for #CoglMetaTexture
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* for more details.</note>
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*
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* Return value: (transfer full): A new #CoglAtlasTexture object or
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* %NULL on failure and @error will be updated.
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* Since: 1.16
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* Stability: unstable
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*/
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CoglAtlasTexture *
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cogl_atlas_texture_new_from_file (CoglContext *ctx,
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const char *filename,
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CoglError **error);
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/**
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* cogl_atlas_texture_new_from_data:
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* @ctx: A #CoglContext
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* @width: width of texture in pixels
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* @height: height of texture in pixels
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* @format: the #CoglPixelFormat the buffer is stored in in RAM
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* @rowstride: the memory offset in bytes between the start of each
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* row in @data. A value of 0 will make Cogl automatically
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* calculate @rowstride from @width and @format.
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* @data: pointer to the memory region where the source buffer resides
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* @error: A #CoglError to catch exceptional errors or %NULL
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*
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* Creates a new #CoglAtlasTexture texture based on data residing in
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* memory. A #CoglAtlasTexture represents a sub-region within one of
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* Cogl's shared texture atlases.
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*
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* <note>This api will always immediately allocate GPU memory for the
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* texture and upload the given data so that the @data pointer does
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* not need to remain valid once this function returns. This means it
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* is not possible to configure the texture before it is allocated. If
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* you do need to configure the texture before allocation (to specify
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* constraints on the internal format for example) then you can
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* instead create a #CoglBitmap for your data and use
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* cogl_atlas_texture_new_from_bitmap() or use
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* cogl_atlas_texture_new_with_size() and then upload data using
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* cogl_texture_set_data()</note>
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*
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* <note>Allocate call can fail if Cogl considers the internal
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* format to be incompatible with the format of its internal
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* atlases.</note>
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*
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* <note>The returned #CoglAtlasTexture is a high-level
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* meta-texture with some limitations. See the documentation for
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* #CoglMetaTexture for more details.</note>
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*
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* Return value: (transfer full): A new #CoglAtlasTexture object or
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* %NULL on failure and @error will be updated.
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* Since: 1.16
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* Stability: unstable
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*/
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CoglAtlasTexture *
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cogl_atlas_texture_new_from_data (CoglContext *ctx,
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int width,
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int height,
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CoglPixelFormat format,
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int rowstride,
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const uint8_t *data,
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CoglError **error);
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/**
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* cogl_atlas_texture_new_from_bitmap:
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* @bitmap: A #CoglBitmap
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*
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* Creates a new #CoglAtlasTexture texture based on data residing in a
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* @bitmap. A #CoglAtlasTexture represents a sub-region within one of
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* Cogl's shared texture atlases.
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*
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* The storage for the texture is not allocated before this function
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* returns. You can call cogl_texture_allocate() to explicitly
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* allocate the underlying storage or preferably let Cogl
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* automatically allocate storage lazily when it may know more about
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* how the texture is being used and can optimize how it is allocated.
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*
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* The texture is still configurable until it has been allocated so
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* for example you can influence the internal format of the texture
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* using cogl_texture_set_components() and
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* cogl_texture_set_premultiplied().
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*
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* <note>Allocate call can fail if Cogl considers the internal
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* format to be incompatible with the format of its internal
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* atlases.</note>
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*
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* <note>The returned #CoglAtlasTexture is a high-level meta-texture
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* with some limitations. See the documentation for #CoglMetaTexture
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* for more details.</note>
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*
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* Returns: (transfer full): A new #CoglAtlasTexture object.
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* Since: 1.16
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* Stability: unstable
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*/
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CoglAtlasTexture *
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cogl_atlas_texture_new_from_bitmap (CoglBitmap *bmp);
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/**
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* cogl_is_atlas_texture:
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* @object: a #CoglObject
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*
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* Checks whether the given object references a #CoglAtlasTexture
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*
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* Return value: %TRUE if the passed object represents an atlas
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* texture and %FALSE otherwise
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*
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* Since: 1.16
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* Stability: Unstable
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*/
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CoglBool
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cogl_is_atlas_texture (void *object);
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COGL_END_DECLS
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#endif /* _COGL_ATLAS_TEXTURE_H_ */
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