6197e3abf3
This adds public constructors which take a CoglBitmap to all primitive texture types. This constructor should be considered the canonical constructor for initializing the texture with data because it should be possible to wrap any type of data in a CoglBitmap. Having at least this single constructor avoids the need to have an explosion of constructors such as new_from_data, new_from_pixel_buffer and new_from_file etc. The already available internal bitmap constructor for CoglTexture2D has had its flags parameter removed under the assumption that flags do not make sense for primitive textures. The meta constructor cogl_texture_new_from_bitmap now just explicitly calls set_auto_mipmap after constructing the texture depending on the value of the COGL_TEXTURE_NO_AUTO_MIPMAP flag. Reviewed-by: Robert Bragg <robert@linux.intel.com>
150 lines
5.5 KiB
C
150 lines
5.5 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_RECTANGLE_H
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#define __COGL_TEXURE_RECTANGLE_H
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#include "cogl-context.h"
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-texture-rectangle
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* @short_description: Functions for creating and manipulating rectangle
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* textures for use with non-normalized coordinates.
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*
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* These functions allow low-level "rectangle" textures to be allocated.
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* These textures are never constrained to power-of-two sizes but they
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* also don't support having a mipmap and can only be wrapped with
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* %COGL_PIPELINE_WRAP_MODE_CLAMP_TO_EDGE.
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*
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* The most notable difference between rectangle textures and 2D
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* textures is that rectangle textures are sampled using un-normalized
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* texture coordinates, so instead of using coordinates (0,0) and
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* (1,1) to map to the top-left and bottom right corners of the
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* texture you would instead use (0,0) and (width,height).
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*
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* The use of non-normalized coordinates can be particularly
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* convenient when writing glsl shaders that use a texture as a lookup
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* table since you don't need to upload separate uniforms to map
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* normalized coordinates to texels.
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*
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* If you want to sample from a rectangle texture from GLSL you should
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* use the sampler2DRect sampler type.
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*
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* Applications wanting to use #CoglTextureRectangle should first check
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* for the %COGL_FEATURE_ID_TEXTURE_RECTANGLE feature using
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* cogl_has_feature().
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*/
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typedef struct _CoglTextureRectangle CoglTextureRectangle;
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#define COGL_TEXTURE_RECTANGLE(X) ((CoglTextureRectangle *)X)
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#define cogl_is_texture_rectangle cogl_is_texture_rectangle_EXP
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/**
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* cogl_is_texture_rectangle:
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* @object: A #CoglObject
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*
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* Gets whether the given object references an existing
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* #CoglTextureRectangle object.
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*
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* Return value: %TRUE if the object references a
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* #CoglTextureRectangle, %FALSE otherwise.
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*/
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gboolean
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cogl_is_texture_rectangle (void *object);
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#define cogl_texture_rectangle_new_with_size \
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cogl_texture_rectangle_new_with_size_EXP
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/**
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* cogl_texture_rectangle_new_with_size:
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* @context: A #CoglContext pointer
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* @width: The texture width to allocate
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* @height: The texture height to allocate
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* @internal_format: The desired internal texture format
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* @error: An optional GError pointer for reporting exceptions
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*
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* Allocates a new #CoglTextureRectangle texture with a given @width, @height
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* and @internal_format. This texture is a low-level texture that
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* the GPU can sample from directly unlike high-level textures such
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* as #CoglTexture2DSliced and #CoglAtlasTexture.
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*
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* <note>If you want to sample from a rectangle texture from GLSL you
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* should use the sampler2DRect sampler type.</note>
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*
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* <note>Applications wanting to use #CoglTextureRectangle should
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* first check for the %COGL_FEATURE_ID_TEXTURE_RECTANGLE feature
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* using cogl_has_feature().</note>
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*
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* Returns: A pointer to a newly allocated #CoglRectangle texture
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* or if the size was too large or there wasn't enough memory
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* %NULL is returned and @error set.
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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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CoglTextureRectangle *
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cogl_texture_rectangle_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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GError **error);
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/**
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* cogl_texture_rectangle_new_from_bitmap:
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* @bitmap: A #CoglBitmap
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* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
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* texture
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* @error: A return location for a GError or %NULL
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*
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* Allocates a new #CoglTextureRectangle texture which will be
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* initialized with the pixel data from @bitmap. Internally the data
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* will be stored in the format given by @internal_format. This
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* texture is a low-level texture that the GPU can sample from
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* directly unlike high-level textures such as #CoglTexture2DSliced
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* and #CoglAtlasTexture.
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*
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* <note>If you want to sample from a rectangle texture from GLSL you
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* should use the sampler2DRect sampler type.</note>
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*
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* <note>Applications wanting to use #CoglTextureRectangle should
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* first check for the %COGL_FEATURE_ID_TEXTURE_RECTANGLE feature
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* using cogl_has_feature().</note>
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*
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* Returns: A pointer to a newly allocated #CoglRectangle texture
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* or if the size was too large or there wasn't enough memory
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* %NULL is returned and @error set.
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* Since: 2.0
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* Stability: unstable
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*/
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CoglTextureRectangle *
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cogl_texture_rectangle_new_from_bitmap (CoglBitmap *bitmap,
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CoglPixelFormat internal_format,
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GError **error);
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G_END_DECLS
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#endif /* __COGL_TEXURE_RECTANGLE_H */
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