/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_TEXTURE_H__
#define __COGL_TEXTURE_H__
/* We forward declare the CoglTexture type here to avoid some circular
* dependency issues with the following headers.
*/
#ifdef __COGL_H_INSIDE__
/* For the public C api we typedef interface types as void to avoid needing
* lots of casting in code and instead we will rely on runtime type checking
* for these objects. */
typedef void CoglTexture;
#else
typedef struct _CoglTexture CoglTexture;
#define COGL_TEXTURE(X) ((CoglTexture *)X)
#endif
#include <cogl/cogl-types.h>
#include <cogl/cogl-macros.h>
#include <cogl/cogl-defines.h>
#if defined (COGL_ENABLE_EXPERIMENTAL_API)
#include <cogl/cogl-pixel-buffer.h>
#endif
#include <cogl/cogl-bitmap.h>
COGL_BEGIN_DECLS
/**
* SECTION:cogl-texture
* @short_description: Functions for creating and manipulating textures
*
* Cogl allows creating and manipulating textures using a uniform
* API that tries to hide all the various complexities of creating,
* loading and manipulating textures.
*/
#define COGL_TEXTURE_MAX_WASTE 127
/**
* COGL_TEXTURE_ERROR:
*
* #CoglError domain for texture errors.
*
* Since: 1.8
* Stability: Unstable
*/
#define COGL_TEXTURE_ERROR (cogl_texture_error_quark ())
/**
* CoglTextureError:
* @COGL_TEXTURE_ERROR_SIZE: Unsupported size
* @COGL_TEXTURE_ERROR_FORMAT: Unsupported format
* @COGL_TEXTURE_ERROR_TYPE: A primitive texture type that is
* unsupported by the driver was used
*
* Error codes that can be thrown when allocating textures.
*
* Since: 1.8
* Stability: Unstable
*/
typedef enum {
COGL_TEXTURE_ERROR_SIZE,
COGL_TEXTURE_ERROR_FORMAT,
COGL_TEXTURE_ERROR_BAD_PARAMETER,
COGL_TEXTURE_ERROR_TYPE
} CoglTextureError;
/**
* CoglTextureType:
* @COGL_TEXTURE_TYPE_2D: A #CoglTexture2D
* @COGL_TEXTURE_TYPE_3D: A #CoglTexture3D
* @COGL_TEXTURE_TYPE_RECTANGLE: A #CoglTextureRectangle
*
* Constants representing the underlying hardware texture type of a
* #CoglTexture.
*
* Stability: unstable
* Since: 1.10
*/
typedef enum {
COGL_TEXTURE_TYPE_2D,
COGL_TEXTURE_TYPE_3D,
COGL_TEXTURE_TYPE_RECTANGLE
} CoglTextureType;
uint32_t cogl_texture_error_quark (void);
/**
* cogl_is_texture:
* @object: A #CoglObject pointer
*
* Gets whether the given object references a texture object.
*
* Return value: %TRUE if the @object references a texture, and
* %FALSE otherwise
*/
CoglBool
cogl_is_texture (void *object);
/**
* CoglTextureComponents:
* @COGL_TEXTURE_COMPONENTS_A: Only the alpha component
* @COGL_TEXTURE_COMPONENTS_RG: Red and green components. Note that
* this can only be used if the %COGL_FEATURE_ID_TEXTURE_RG feature
* is advertised.
* @COGL_TEXTURE_COMPONENTS_RGB: Red, green and blue components
* @COGL_TEXTURE_COMPONENTS_RGBA: Red, green, blue and alpha components
* @COGL_TEXTURE_COMPONENTS_DEPTH: Only a depth component
*
* See cogl_texture_set_components().
*
* Since: 1.18
*/
typedef enum _CoglTextureComponents
{
COGL_TEXTURE_COMPONENTS_A = 1,
COGL_TEXTURE_COMPONENTS_RG,
COGL_TEXTURE_COMPONENTS_RGB,
COGL_TEXTURE_COMPONENTS_RGBA,
COGL_TEXTURE_COMPONENTS_DEPTH
} CoglTextureComponents;
/**
* cogl_texture_set_components:
* @texture: a #CoglTexture pointer.
*
* Affects the internal storage format for this texture by specifying
* what components will be required for sampling later.
*
* This api affects how data is uploaded to the GPU since unused
* components can potentially be discarded from source data.
*
* For textures created by the ‘_with_size’ constructors the default
* is %COGL_TEXTURE_COMPONENTS_RGBA. The other constructors which take
* a %CoglBitmap or a data pointer default to the same components as
* the pixel format of the data.
*
* Note that the %COGL_TEXTURE_COMPONENTS_RG format is not available
* on all drivers. The availability can be determined by checking for
* the %COGL_FEATURE_ID_TEXTURE_RG feature. If this format is used on
* a driver where it is not available then %COGL_TEXTURE_ERROR_FORMAT
* will be raised when the texture is allocated. Even if the feature
* is not available then %COGL_PIXEL_FORMAT_RG_88 can still be used as
* an image format as long as %COGL_TEXTURE_COMPONENTS_RG isn't used
* as the texture's components.
*
* Since: 1.18
*/
void
cogl_texture_set_components (CoglTexture *texture,
CoglTextureComponents components);
/**
* cogl_texture_get_components:
* @texture: a #CoglTexture pointer.
*
* Queries what components the given @texture stores internally as set
* via cogl_texture_set_components().
*
* For textures created by the ‘_with_size’ constructors the default
* is %COGL_TEXTURE_COMPONENTS_RGBA. The other constructors which take
* a %CoglBitmap or a data pointer default to the same components as
* the pixel format of the data.
*
* Since: 1.18
*/
CoglTextureComponents
cogl_texture_get_components (CoglTexture *texture);
/**
* cogl_texture_set_premultiplied:
* @texture: a #CoglTexture pointer.
* @premultiplied: Whether any internally stored red, green or blue
* components are pre-multiplied by an alpha
* component.
*
* Affects the internal storage format for this texture by specifying
* whether red, green and blue color components should be stored as
* pre-multiplied alpha values.
*
* This api affects how data is uploaded to the GPU since Cogl will
* convert source data to have premultiplied or unpremultiplied
* components according to this state.
*
* For example if you create a texture via
* cogl_texture_2d_new_with_size() and then upload data via
* cogl_texture_set_data() passing a source format of
* %COGL_PIXEL_FORMAT_RGBA_8888 then Cogl will internally multiply the
* red, green and blue components of the source data by the alpha
* component, for each pixel so that the internally stored data has
* pre-multiplied alpha components. If you instead upload data that
* already has pre-multiplied components by passing
* %COGL_PIXEL_FORMAT_RGBA_8888_PRE as the source format to
* cogl_texture_set_data() then the data can be uploaded without being
* converted.
*
* By default the @premultipled state is @TRUE.
*
* Since: 1.18
*/
void
cogl_texture_set_premultiplied (CoglTexture *texture,
CoglBool premultiplied);
/**
* cogl_texture_get_premultiplied:
* @texture: a #CoglTexture pointer.
*
* Queries the pre-multiplied alpha status for internally stored red,
* green and blue components for the given @texture as set by
* cogl_texture_set_premultiplied().
*
* By default the pre-multipled state is @TRUE.
*
* Return value: %TRUE if red, green and blue components are
* internally stored pre-multiplied by the alpha
* value or %FALSE if not.
* Since: 1.18
*/
CoglBool
cogl_texture_get_premultiplied (CoglTexture *texture);
/**
* cogl_texture_get_width:
* @texture: a #CoglTexture pointer.
*
* Queries the width of a cogl texture.
*
* Return value: the width of the GPU side texture in pixels
*/
unsigned int
cogl_texture_get_width (CoglTexture *texture);
/**
* cogl_texture_get_height:
* @texture: a #CoglTexture pointer.
*
* Queries the height of a cogl texture.
*
* Return value: the height of the GPU side texture in pixels
*/
unsigned int
cogl_texture_get_height (CoglTexture *texture);
/**
* cogl_texture_get_max_waste:
* @texture: a #CoglTexture pointer.
*
* Queries the maximum wasted (unused) pixels in one dimension of a GPU side
* texture.
*
* Return value: the maximum waste
*/
int
cogl_texture_get_max_waste (CoglTexture *texture);
/**
* cogl_texture_is_sliced:
* @texture: a #CoglTexture pointer.
*
* Queries if a texture is sliced (stored as multiple GPU side tecture
* objects).
*
* Return value: %TRUE if the texture is sliced, %FALSE if the texture
* is stored as a single GPU texture
*/
CoglBool
cogl_texture_is_sliced (CoglTexture *texture);
/**
* cogl_texture_get_gl_texture:
* @texture: a #CoglTexture pointer.
* @out_gl_handle: (out) (allow-none): pointer to return location for the
* textures GL handle, or %NULL.
* @out_gl_target: (out) (allow-none): pointer to return location for the
* GL target type, or %NULL.
*
* Queries the GL handles for a GPU side texture through its #CoglTexture.
*
* If the texture is spliced the data for the first sub texture will be
* queried.
*
* Return value: %TRUE if the handle was successfully retrieved, %FALSE
* if the handle was invalid
*/
CoglBool
cogl_texture_get_gl_texture (CoglTexture *texture,
unsigned int *out_gl_handle,
unsigned int *out_gl_target);
/**
* cogl_texture_get_data:
* @texture: a #CoglTexture pointer.
* @format: the #CoglPixelFormat to store the texture as.
* @rowstride: the rowstride of @data in bytes or pass 0 to calculate
* from the bytes-per-pixel of @format multiplied by the
* @texture width.
* @data: memory location to write the @texture's contents, or %NULL
* to only query the data size through the return value.
*
* Copies the pixel data from a cogl texture to system memory.
*
* <note>Don't pass the value of cogl_texture_get_rowstride() as the
* @rowstride argument, the rowstride should be the rowstride you
* want for the destination @data buffer not the rowstride of the
* source texture</note>
*
* Return value: the size of the texture data in bytes
*/
int
cogl_texture_get_data (CoglTexture *texture,
CoglPixelFormat format,
unsigned int rowstride,
uint8_t *data);
/**
* cogl_texture_set_region:
* @texture: a #CoglTexture.
* @src_x: upper left coordinate to use from source data.
* @src_y: upper left coordinate to use from source data.
* @dst_x: upper left destination horizontal coordinate.
* @dst_y: upper left destination vertical coordinate.
* @dst_width: width of destination region to write. (Must be less
* than or equal to @width)
* @dst_height: height of destination region to write. (Must be less
* than or equal to @height)
* @width: width of source data buffer.
* @height: height of source data buffer.
* @format: the #CoglPixelFormat used in the source buffer.
* @rowstride: rowstride of source buffer (computed from width if none
* specified)
* @data: the actual pixel data.
*
* Sets the pixels in a rectangular subregion of @texture from an in-memory
* buffer containing pixel data.
*
* <note>The region set can't be larger than the source @data</note>
*
* Return value: %TRUE if the subregion upload was successful, and
* %FALSE otherwise
*/
CoglBool
cogl_texture_set_region (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const uint8_t *data);
#if defined (COGL_ENABLE_EXPERIMENTAL_API)
/**
* cogl_texture_set_data:
* @texture a #CoglTexture.
* @format: the #CoglPixelFormat used in the source @data buffer.
* @rowstride: rowstride of the source @data buffer (computed from
* the texture width and @format if it equals 0)
* @data: the source data, pointing to the first top-left pixel to set
* @level: The mipmap level to update (Normally 0 for the largest,
* base texture)
* @error: A #CoglError to return exceptional errors
*
* Sets all the pixels for a given mipmap @level by copying the pixel
* data pointed to by the @data argument into the given @texture.
*
* @data should point to the first pixel to copy corresponding
* to the top left of the mipmap @level being set.
*
* If @rowstride equals 0 then it will be automatically calculated
* from the width of the mipmap level and the bytes-per-pixel for the
* given @format.
*
* A mipmap @level of 0 corresponds to the largest, base image of a
* texture and @level 1 is half the width and height of level 0. If
* dividing any dimension of the previous level by two results in a
* fraction then round the number down (floor()), but clamp to 1
* something like this:
*
* |[
* next_width = MAX (1, floor (prev_width));
* ]|
*
* You can determine the number of mipmap levels for a given texture
* like this:
*
* |[
* n_levels = 1 + floor (log2 (max_dimension));
* ]|
*
* Where %max_dimension is the larger of cogl_texture_get_width() and
* cogl_texture_get_height().
*
* It is an error to pass a @level number >= the number of levels that
* @texture can have according to the above calculation.
*
* <note>Since the storage for a #CoglTexture is allocated lazily then
* if the given @texture has not previously been allocated then this
* api can return %FALSE and throw an exceptional @error if there is
* not enough memory to allocate storage for @texture.</note>
*
* Return value: %TRUE if the data upload was successful, and
* %FALSE otherwise
*/
CoglBool
cogl_texture_set_data (CoglTexture *texture,
CoglPixelFormat format,
int rowstride,
const uint8_t *data,
int level,
CoglError **error);
/**
* cogl_texture_set_region_from_bitmap:
* @texture: a #CoglTexture pointer
* @src_x: upper left coordinate to use from the source bitmap.
* @src_y: upper left coordinate to use from the source bitmap
* @dst_x: upper left destination horizontal coordinate.
* @dst_y: upper left destination vertical coordinate.
* @dst_width: width of destination region to write. (Must be less
* than or equal to the bitmap width)
* @dst_height: height of destination region to write. (Must be less
* than or equal to the bitmap height)
* @bitmap: The source bitmap to read from
*
* Copies a specified source region from @bitmap to the position
* (@src_x, @src_y) of the given destination texture @handle.
*
* <note>The region updated can't be larger than the source
* bitmap</note>
*
* Return value: %TRUE if the subregion upload was successful, and
* %FALSE otherwise
*
* Since: 1.8
* Stability: unstable
*/
CoglBool
cogl_texture_set_region_from_bitmap (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bitmap);
#endif
/**
* cogl_texture_allocate:
* @texture: A #CoglTexture
* @error: A #CoglError to return exceptional errors or %NULL
*
* Explicitly allocates the storage for the given @texture which
* allows you to be sure that there is enough memory for the
* texture and if not then the error can be handled gracefully.
*
* <note>Normally applications don't need to use this api directly
* since the texture will be implicitly allocated when data is set on
* the texture, or if the texture is attached to a #CoglOffscreen
* framebuffer and rendered too.</note>
*
* Return value: %TRUE if the texture was successfully allocated,
* otherwise %FALSE and @error will be updated if it
* wasn't %NULL.
*/
CoglBool
cogl_texture_allocate (CoglTexture *texture,
CoglError **error);
COGL_END_DECLS
#endif /* __COGL_TEXTURE_H__ */