73e8a6d7ce
Consistent with how we lazily allocate framebuffers this patch allows us to instantiate textures but still specify constraints and requirements before allocating storage so that we can be sure to allocate the most appropriate/efficient storage. This adds a cogl_texture_allocate() function that is analogous to cogl_framebuffer_allocate() which can optionally be called to explicitly allocate storage and catch any errors. If this function isn't used explicitly then Cogl will implicitly ensure textures are allocated before the storage is needed. It is generally recommended to rely on lazy storage allocation or at least perform explicit allocation as late as possible so Cogl can be fully informed about the best way to allocate storage. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 1fa7c0f10a8a03043e3c75cb079a49625df098b7) Note: This reverts the cogl_texture_rectangle_new_with_size API change that dropped the CoglError argument and keeps the semantics of allocating the texture immediately. This is because Mutter currently uses this API so we will probably look at updating this later once we have a corresponding Mutter patch prepared. The other API changes were kept since they only affected experimental api.
191 lines
7.3 KiB
C
191 lines
7.3 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) 2011 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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* Authors:
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* Robert Bragg <robert@linux.intel.com>
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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_TEXTURE_2D_H
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#define __COGL_TEXTURE_2D_H
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#include "cogl-context.h"
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#include "cogl-bitmap.h"
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COGL_BEGIN_DECLS
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/**
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* SECTION:cogl-texture-2d
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* @short_description: Functions for creating and manipulating 2D textures
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*
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* These functions allow low-level 2D textures to be allocated. These
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* differ from sliced textures for example which may internally be
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* made up of multiple 2D textures, or atlas textures where Cogl must
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* internally modify user texture coordinates before they can be used
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* by the GPU.
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*
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* You should be aware that many GPUs only support power of two sizes
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* for #CoglTexture2D textures. You can check support for non power of
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* two textures by checking for the %COGL_FEATURE_ID_TEXTURE_NPOT feature
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* via cogl_has_feature().
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*/
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typedef struct _CoglTexture2D CoglTexture2D;
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#define COGL_TEXTURE_2D(X) ((CoglTexture2D *)X)
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/**
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* cogl_is_texture_2d:
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* @object: A #CoglObject
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*
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* Gets whether the given object references an existing #CoglTexture2D
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* object.
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*
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* Return value: %TRUE if the object references a #CoglTexture2D,
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* %FALSE otherwise
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*/
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CoglBool
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cogl_is_texture_2d (void *object);
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/**
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* cogl_texture_2d_new_with_size:
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* @ctx: A #CoglContext
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* @width: Width of the texture to allocate
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* @height: Height of the texture to allocate
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* @internal_format: The format of the texture
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*
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* Allocates a low-level #CoglTexture2D texture that your GPU can
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* texture from directly. This is unlike sliced textures for example
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* which may be comprised of multiple internal textures, or atlas
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* textures where Cogl has to modify texture coordinates before they
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* may be used by the GPU.
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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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* <note>Many GPUs only support power of two sizes for #CoglTexture2D
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* textures. You can check support for non power of two textures by
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* checking for the %COGL_FEATURE_ID_TEXTURE_NPOT feature via
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* cogl_has_feature().</note>
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*
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* Returns: A new #CoglTexture2D object with no storage yet allocated.
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*
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* Since: 2.0
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*/
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CoglTexture2D *
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cogl_texture_2d_new_with_size (CoglContext *ctx,
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int width,
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int height,
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CoglPixelFormat internal_format);
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/**
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* cogl_texture_2d_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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* @internal_format: the #CoglPixelFormat that will be used for storing
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* the buffer on the GPU. If %COGL_PIXEL_FORMAT_ANY is given then a
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* premultiplied format similar to the format of the source data will
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* be used. The default blending equations of Cogl expect premultiplied
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* color data; the main use of passing a non-premultiplied format here
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* is if you have non-premultiplied source data and are going to adjust
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* the blend mode (see cogl_pipeline_set_blend()) or use the data for
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* something other than straight blending.
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* @rowstride: the memory offset in bytes between the starts of
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* scanlines 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 the memory region where the source buffer resides
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* @error: A #CoglError for exceptions
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*
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* Creates a new #CoglTexture2D texture based on data residing in memory.
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* These are unlike sliced textures for example which may be comprised
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* of multiple internal textures, or atlas textures where Cogl has to
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* modify texture coordinates before they may be used by the GPU.
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*
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* <note>Many GPUs only support power of two sizes for #CoglTexture2D
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* textures. You can check support for non power of two textures by
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* checking for the %COGL_FEATURE_ID_TEXTURE_NPOT feature via
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* cogl_has_feature().</note>
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*
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* Returns: A newly allocated #CoglTexture2D, or if the size is not
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* supported (because it is too large or a non-power-of-two
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* size that the hardware doesn't support) it will return
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* %NULL and set @error.
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*
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* Since: 2.0
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*/
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CoglTexture2D *
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cogl_texture_2d_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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CoglPixelFormat internal_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_texture_2d_new_from_bitmap:
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* @bitmap: A #CoglBitmap
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* @internal_format: the #CoglPixelFormat that will be used for storing
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* the buffer on the GPU. If %COGL_PIXEL_FORMAT_ANY is given then a
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* premultiplied format similar to the format of the source data will
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* be used. The default blending equations of Cogl expect premultiplied
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* color data; the main use of passing a non-premultiplied format here
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* is if you have non-premultiplied source data and are going to adjust
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* the blend mode (see cogl_pipeline_set_blend()) or use the data for
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* something other than straight blending.
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* @error: A #CoglError for exceptions
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*
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* Creates a new #CoglTexture2D texture based on data residing in a
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* bitmap. These are unlike sliced textures for example which may be
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* comprised of multiple internal textures, or atlas textures where
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* Cogl has to modify texture coordinates before they may be used by
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* the GPU.
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*
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* <note>Many GPUs only support power of two sizes for #CoglTexture2D
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* textures. You can check support for non power of two textures by
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* checking for the %COGL_FEATURE_ID_TEXTURE_NPOT feature via
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* cogl_has_feature().</note>
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*
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* Returns: A newly allocated #CoglTexture2D, or if the size is not
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* supported (because it is too large or a non-power-of-two
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* size that the hardware doesn't support) it will return
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* %NULL and set @error.
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*
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* Since: 2.0
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* Stability: unstable
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*/
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CoglTexture2D *
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cogl_texture_2d_new_from_bitmap (CoglBitmap *bitmap,
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CoglPixelFormat internal_format,
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CoglError **error);
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COGL_END_DECLS
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#endif /* __COGL_TEXTURE_2D_H */
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