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54735dec84
The coding style has for a long time said to avoid using redundant glib
data types such as gint or gchar etc because we feel that they make the
code look unnecessarily foreign to developers coming from outside of the
Gnome developer community.
Note: When we tried to find the historical rationale for the types we
just found that they were apparently only added for consistent syntax
highlighting which didn't seem that compelling.
Up until now we have been continuing to use some of the platform
specific type such as gint{8,16,32,64} and gsize but this patch switches
us over to using the standard c99 equivalents instead so we can further
ensure that our code looks familiar to the widest range of C developers
who might potentially contribute to Cogl.
So instead of using the gint{8,16,32,64} and guint{8,16,32,64} types this
switches all Cogl code to instead use the int{8,16,32,64}_t and
uint{8,16,32,64}_t c99 types instead.
Instead of gsize we now use size_t
For now we are not going to use the c99 _Bool type and instead we have
introduced a new CoglBool type to use instead of gboolean.
Reviewed-by: Neil Roberts <neil@linux.intel.com>
(cherry picked from commit 5967dad2400d32ca6319cef6cb572e81bf2c15f0)
117 lines
4.5 KiB
C
117 lines
4.5 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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#ifndef __COGL_TEXURE_2D_SLICED_H
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#define __COGL_TEXURE_2D_SLICED_H
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#include "cogl-context.h"
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#include "cogl-types.h"
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#include <glib.h>
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/**
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* SECTION:cogl-texture-2d-sliced
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* @short_description: Functions for creating and manipulating 2D meta
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* textures that may internally be comprised of
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* multiple 2D textures with power-of-two sizes.
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*
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* These functions allow high-level meta textures (See the
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* #CoglMetaTexture interface) to be allocated that may internally be
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* comprised of multiple 2D texture "slices" with power-of-two sizes.
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*
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* This API can be useful when working with GPUs that don't have
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* native support for non-power-of-two textures or if you want to load
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* a texture that is larger than the GPUs maximum texture size limits.
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*
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* The algorithm for slicing works by first trying to map a virtual
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* size to the next larger power-of-two size and then seeing how many
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* wasted pixels that would result in. For example if you have a
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* virtual texture that's 259 texels wide, the next pot size = 512 and
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* the amount of waste would be 253 texels. If the amount of waste is
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* above a max-waste threshold then we would next slice that texture
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* into one that's 256 texels and then looking at how many more texels
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* remain unallocated after that we choose the next power-of-two size.
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* For the example of a 259 texel image that would mean having a 256
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* texel wide texture, leaving 3 texels unallocated so we'd then
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* create a 4 texel wide texture - now there is only one texel of
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* waste. The algorithm continues to slice the right most textures
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* until the amount of waste is less than or equal to a specfied
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* max-waste threshold. The same logic for slicing from left to right
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* is also applied from top to bottom.
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*/
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typedef struct _CoglTexture2DSliced CoglTexture2DSliced;
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#define COGL_TEXTURE_2D_SLICED(X) ((CoglTexture2DSliced *)X)
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/**
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* cogl_texture_2d_sliced_new_with_size:
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* @ctx: A #CoglContext
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* @width: The virtual width of your sliced texture.
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* @height: The virtual height of your sliced texture.
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* @max_waste: The threshold of how wide a strip of wasted texels
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* are allowed in the non-power-of-two textures before
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* they must be sliced to reduce the amount of waste.
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* @internal_format: The format of the texture
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* @error: A #GError for exceptions.
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*
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* Creates a #CoglTexture2DSliced that may internally be comprised of
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* 1 or more #CoglTexture2D textures with power-of-two sizes.
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* @max_waste is used as a threshold for recursively slicing the
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* right-most or bottom-most slices into smaller power-of-two sizes
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* until the wasted padding at the bottom and right of the
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* power-of-two textures is less than specified.
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*
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* Returns: A newly allocated #CoglTexture2DSliced or if there was
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* an error allocating any of the internal slices %NULL is
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* returned and @error is updated.
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*
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* Since: 1.10
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* Stability: unstable
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*/
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CoglTexture2DSliced *
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cogl_texture_2d_sliced_new_with_size (CoglContext *ctx,
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unsigned int width,
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unsigned int height,
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int max_waste,
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CoglPixelFormat internal_format,
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GError **error);
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/**
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* cogl_is_texture_2d_sliced:
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* @object: A #CoglObject pointer
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*
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* Gets whether the given object references a #CoglTexture2dSliced.
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*
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* Return value: %TRUE if the object references a #CoglTexture2dSliced
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* and %FALSE otherwise.
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* Since: 1.10
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* Stability: unstable
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*/
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CoglBool
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cogl_is_texture_2d_sliced (void *object);
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#endif /* __COGL_TEXURE_2D_SLICED_H */
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