296 lines
13 KiB
C
296 lines
13 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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/**
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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 along the right and bottom textures before
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* they must be sliced to reduce the amount of waste. A
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* negative can be passed to disable slicing.
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* @internal_format: The format of the texture
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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 depending on GPU limitations.
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* For example if the GPU only supports power-of-two sized textures
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* then a sliced texture will turn a non-power-of-two size into a
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* combination of smaller power-of-two sized textures. If the
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* requested texture size is larger than is supported by the hardware
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* then the texture will be sliced into smaller textures that can be
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* accessed by the hardware.
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*
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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 sizes until the
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* wasted padding at the bottom and right of the textures is less than
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* specified. A negative @max_waste will disable slicing.
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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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* <note>It's possible for the allocation of a sliced texture to fail
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* later due to impossible slicing constraints if a negative
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* @max_waste value is given. If the given virtual texture size size
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* is larger than is supported by the hardware but slicing is disabled
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* the texture size would be too large to handle.</note>
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*
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* Returns: (transfer full): A new #CoglTexture2DSliced object with no storage
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* allocated yet.
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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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int width,
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int height,
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int max_waste,
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CoglPixelFormat internal_format);
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/**
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* cogl_texture_2d_sliced_new_from_file:
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* @ctx: A #CoglContext
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* @filename: the file to load
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* @max_waste: The threshold of how wide a strip of wasted texels
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* are allowed along the right and bottom textures before
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* they must be sliced to reduce the amount of waste. A
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* negative can be passed to disable slicing.
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
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* format similar to the format of the source data will be used. The
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* default blending equations of Cogl expect premultiplied color data;
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* the main use of passing a non-premultiplied format here is if you
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* have non-premultiplied source data and are going to adjust the blend
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* mode (see cogl_material_set_blend()) or use the data for something
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* other than straight blending.
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* @error: A #CoglError to catch exceptional errors or %NULL
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*
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* Creates a #CoglTexture2DSliced from an image file.
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*
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* A #CoglTexture2DSliced may internally be comprised of 1 or more
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* #CoglTexture2D textures depending on GPU limitations. For example
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* if the GPU only supports power-of-two sized textures then a sliced
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* texture will turn a non-power-of-two size into a combination of
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* smaller power-of-two sized textures. If the requested texture size
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* is larger than is supported by the hardware then the texture will
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* be sliced into smaller textures that can be accessed by the
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* hardware.
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*
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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 sizes until the
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* wasted padding at the bottom and right of the textures is less than
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* specified. A negative @max_waste will disable slicing.
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*
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* <note>It's possible for the allocation of a sliced texture to fail
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* later due to impossible slicing constraints if a negative
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* @max_waste value is given. If the given virtual texture size is
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* larger than is supported by the hardware but slicing is disabled
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* the texture size would be too large to handle.</note>
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*
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* Return value: (transfer full): A newly created #CoglTexture2DSliced
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* or %NULL on failure and @error will be updated.
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*
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* Since: 1.16
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*/
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CoglTexture2DSliced *
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cogl_texture_2d_sliced_new_from_file (CoglContext *ctx,
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const char *filename,
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int max_waste,
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CoglPixelFormat internal_format,
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CoglError **error);
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/**
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* cogl_texture_2d_sliced_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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* @max_waste: The threshold of how wide a strip of wasted texels
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* are allowed along the right and bottom textures before
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* they must be sliced to reduce the amount of waste. A
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* negative can be passed to disable slicing.
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
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* format similar to the format of the source data will be used. The
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* default blending equations of Cogl expect premultiplied color data;
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* the main use of passing a non-premultiplied format here is if you
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* have non-premultiplied source data and are going to adjust the blend
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* mode (see cogl_material_set_blend()) or use the data for something
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* other than straight blending.
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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 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 #CoglTexture2DSliced texture based on data residing
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* in memory.
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*
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* A #CoglTexture2DSliced may internally be comprised of 1 or more
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* #CoglTexture2D textures depending on GPU limitations. For example
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* if the GPU only supports power-of-two sized textures then a sliced
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* texture will turn a non-power-of-two size into a combination of
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* smaller power-of-two sized textures. If the requested texture size
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* is larger than is supported by the hardware then the texture will
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* be sliced into smaller textures that can be accessed by the
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* hardware.
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*
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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 sizes until the
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* wasted padding at the bottom and right of the textures is less than
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* specified. A negative @max_waste will disable slicing.
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*
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* <note>It's possible for the allocation of a sliced texture to fail
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* later due to impossible slicing constraints if a negative
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* @max_waste value is given. If the given virtual texture size is
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* larger than is supported by the hardware but slicing is disabled
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* the texture size would be too large to handle.</note>
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*
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* Return value: (transfer full): A newly created #CoglTexture2DSliced
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* or %NULL on failure and @error will be updated.
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*
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* Since: 1.16
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*/
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CoglTexture2DSliced *
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cogl_texture_2d_sliced_new_from_data (CoglContext *ctx,
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int width,
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int height,
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int max_waste,
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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_sliced_new_from_bitmap:
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* @bmp: A #CoglBitmap
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* @max_waste: The threshold of how wide a strip of wasted texels
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* are allowed along the right and bottom textures before
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* they must be sliced to reduce the amount of waste. A
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* negative can be passed to disable slicing.
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
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* format similar to the format of the source data will be used. The
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* default blending equations of Cogl expect premultiplied color data;
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* the main use of passing a non-premultiplied format here is if you
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* have non-premultiplied source data and are going to adjust the blend
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* mode (see cogl_material_set_blend()) or use the data for something
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* other than straight blending.
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* @error: A #CoglError to catch exceptional errors or %NULL
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*
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* Creates a new #CoglTexture2DSliced texture based on data residing
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* in a bitmap.
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*
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* A #CoglTexture2DSliced may internally be comprised of 1 or more
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* #CoglTexture2D textures depending on GPU limitations. For example
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* if the GPU only supports power-of-two sized textures then a sliced
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* texture will turn a non-power-of-two size into a combination of
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* smaller power-of-two sized textures. If the requested texture size
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* is larger than is supported by the hardware then the texture will
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* be sliced into smaller textures that can be accessed by the
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* hardware.
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*
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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 sizes until the
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* wasted padding at the bottom and right of the textures is less than
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* specified. A negative @max_waste will disable slicing.
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*
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* <note>It's possible for the allocation of a sliced texture to fail
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* later due to impossible slicing constraints if a negative
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* @max_waste value is given. If the given virtual texture size is
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* larger than is supported by the hardware but slicing is disabled
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* the texture size would be too large to handle.</note>
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*
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* Return value: (transfer full): A newly created #CoglTexture2DSliced
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* or %NULL on failure and @error will be updated.
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*
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* Since: 1.16
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*/
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CoglTexture2DSliced *
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cogl_texture_2d_sliced_new_from_bitmap (CoglBitmap *bmp,
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int max_waste,
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CoglPixelFormat internal_format,
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CoglError **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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