/* cogl-texture.h: Texture objects
* This file is part of Clutter
*
* Copyright (C) 2008 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(CLUTTER_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_TEXTURE_H__
#define __COGL_TEXTURE_H__
G_BEGIN_DECLS
#include <cogl/cogl-types.h>
/**
* SECTION:cogl-texture
* @short_description: Fuctions for creating and manipulating textures
*
* COGL allows creating and manipulating GL textures using a uniform
* API that tries to hide all the various complexities of creating,
* loading and manipulating textures.
*/
/**
* cogl_texture_new_with_size:
* @width: width of texture in pixels.
* @height: height of texture in pixels.
* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
* texture fit GPU limitations.
* @auto_mipmap: enable or disable automatic generation of mipmap pyramid
* from the base level image whenever it is updated.
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture.
*
* Create a new texture with specified dimensions and pixel format.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if texture creation failed.
*/
CoglHandle cogl_texture_new_with_size (guint width,
guint height,
gint max_waste,
gboolean auto_mipmap,
CoglPixelFormat internal_format);
/**
* cogl_texture_new_from_file:
* @filename: the file to load
* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
* texture fit GPU limitations.
* @auto_mipmap: enable or disable automatic generation of mipmap pyramid
* from the base level image whenever it is updated.
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture.
* @error: a #GError or NULL.
*
* Load an image file from disk.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if creating the texture failed.
*/
CoglHandle cogl_texture_new_from_file (const gchar *filename,
gint max_waste,
gboolean auto_mipmap,
CoglPixelFormat internal_format,
GError **error);
/**
* cogl_texture_new_from_data:
* @width: width of texture in pixels.
* @height: height of texture in pixels.
* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
* @auto_mipmap: enable or disable automatic generation of mipmap pyramid
* from the base level image whenever it is updated.
* @format: the #CoglPixelFormat the buffer is stored in in RAM
* @internal_format: the #CoglPixelFormat that will be used for storing the
* buffer on the GPU.
* @rowstride: the memory offset in bytes between the starts of scanlines in
* @data.
* @data: pointer the memory region where the source buffer resides.
*
* Create a new cogl texture based on data residing in memory.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if creating the texture failed.
*/
CoglHandle cogl_texture_new_from_data (guint width,
guint height,
gint max_waste,
gboolean auto_mipmap,
CoglPixelFormat format,
CoglPixelFormat internal_format,
guint rowstride,
const guchar *data);
/**
* cogl_texture_new_from_foreign:
* @gl_handle: opengl target type of foreign texture
* @gl_target: opengl handle of foreign texture.
* @width: width of foreign texture
* @height: height of foreign texture.
* @x_pot_waste: maximum horizontal waste.
* @y_pot_waste: maximum vertical waste.
* @format: format of the foreign texture.
*
* Create a cogl texture based on an existing OpenGL texture, the width, height
* and format are passed along since it is not possible to query this from a
* handle with GLES 1.0.
*
* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
* if creating the texture failed.
*/
CoglHandle cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format);
/**
* cogl_is_texture:
* @handle: A CoglHandle
*
* Gets whether the given handle references an existing texture object.
*
* Returns: %TRUE if the handle references a texture,
* %FALSE otherwise
*/
gboolean cogl_is_texture (CoglHandle handle);
/**
* cogl_texture_get_width:
* @handle: a #CoglHandle for a texture.
*
* Query the width of a cogl texture.
*
* Returns: the width of the GPU side texture in pixels:
*/
guint cogl_texture_get_width (CoglHandle handle);
/**
* cogl_texture_get_height:
* @handle: a #CoglHandle for a texture.
*
* Query the height of a cogl texture.
*
* Returns: the height of the GPU side texture in pixels:
*/
guint cogl_texture_get_height (CoglHandle handle);
/**
* cogl_texture_get_format:
* @handle: a #CoglHandle for a texture.
*
* Query the #CoglPixelFormat of a cogl texture.
*
* Returns: the #CoglPixelFormat of the GPU side texture.
*/
CoglPixelFormat cogl_texture_get_format (CoglHandle handle);
/**
* cogl_texture_get_rowstride:
* @handle: a #CoglHandle for a texture.
*
* Query the rowstride of a cogl texture.
*
* Returns: the offset in bytes between each consequetive row of pixels.
*/
guint cogl_texture_get_rowstride (CoglHandle handle);
/**
* cogl_texture_get_max_waste:
* @handle: a #CoglHandle for a texture.
*
* Query the maximum wasted (unused) pixels in one dimension of a GPU side
* texture.
*
* Returns: the maximum waste.
*/
gint cogl_texture_get_max_waste (CoglHandle handle);
/**
* cogl_texture_get_min_filter:
* @handle: a #CoglHandle for a texture.
*
* Query the currently set downscaling filter for a cogl texture.
*
* Returns: the current downscaling filter for a cogl texture.
*/
COGLenum cogl_texture_get_min_filter (CoglHandle handle);
/**
* cogl_texture_get_mag_filter:
* @handle: a #CoglHandle for a texture.
*
* Query the currently set downscaling filter for a cogl texture.
*
* Returns: the current downscaling filter for a cogl texture.
*/
COGLenum cogl_texture_get_mag_filter (CoglHandle handle);
/**
* cogl_texture_is_sliced:
* @handle: a #CoglHandle for a texture.
*
* Query if a texture is sliced (stored as multiple GPU side tecture
* objects).
*
* Returns: %TRUE if the texture is sliced, %FALSE if the texture
* is stored as a single GPU texture.
*/
gboolean cogl_texture_is_sliced (CoglHandle handle);
/**
* cogl_texture_get_gl_texture:
* @handle: a #CoglHandle for a texture.
* @out_gl_handle: pointer to return location for the textures GL handle, or
* NULL.
* @out_gl_target: pointer to return location for the GL target type, or NULL.
*
* Query the GL handles for a GPU side texture through it's #CoglHandle,
* if the texture is spliced the data for the first sub texture will be
* queried.
*
* Returns: %TRUE if the handle was successfully retrieved %FALSE
* if the handle was invalid.
*/
gboolean cogl_texture_get_gl_texture (CoglHandle handle,
GLuint *out_gl_handle,
GLenum *out_gl_target);
/**
* cogl_texture_get_data:
* @handle: a #CoglHandle for a texture.
* @format: the #CoglPixelFormat to store the texture as.
* @rowstride: the rowstride of @data or retrieved from texture if none is
* specified.
* @data: memory location to write contents of buffer, or %NULL if we're
* only querying the data size through the return value.
*
* Copy the pixel data from a cogl texture to system memory.
*
* Returns: the size of the texture data in bytes (or 0 if the texture
* is not valid.)
*/
gint cogl_texture_get_data (CoglHandle handle,
CoglPixelFormat format,
guint rowstride,
guchar *data);
/**
* cogl_texture_set_filters:
* @handle: a #CoglHandle.
* @min_filter: the filter used when scaling the texture down.
* @mag_filter: the filter used when magnifying the texture.
*
* Changes the decimation and interpolation filters used when the texture is
* drawn at other scales than 100%.
*/
void cogl_texture_set_filters (CoglHandle handle,
COGLenum min_filter,
COGLenum mag_filter);
/**
* cogl_texture_set_region:
* @handle: a #CoglHandle.
* @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.
* @dst_height: height of destination region to write.
* @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 @handle from an in-memory
* buffer containing pixel data.
*
* Returns: %TRUE if the subregion upload was successful, otherwise %FALSE.
*/
gboolean cogl_texture_set_region (CoglHandle handle,
gint src_x,
gint src_y,
gint dst_x,
gint dst_y,
guint dst_width,
guint dst_height,
gint width,
gint height,
CoglPixelFormat format,
guint rowstride,
const guchar *data);
/**
* cogl_texture_ref:
* @handle: a @CoglHandle.
*
* Increment the reference count for a cogl texture.
*
* Returns: the @handle.
*/
CoglHandle cogl_texture_ref (CoglHandle handle);
/**
* cogl_texture_unref:
* @handle: a @CoglHandle.
*
* Deccrement the reference count for a cogl texture.
*/
void cogl_texture_unref (CoglHandle handle);
/**
* cogl_texture_rectangle:
* @handle: a @CoglHandle.
* @x1: x coordinate upper left on screen.
* @y1: y coordinate upper left on screen.
* @x2: x coordinate lower right on screen.
* @y2: y coordinate lower right on screen.
* @tx1: x part of texture coordinate to use for upper left pixel
* @ty1: y part of texture coordinate to use for upper left pixel
* @tx2: x part of texture coordinate to use for lower right pixel
* @ty2: y part of texture coordinate to use for left pixel
*
* Draw a rectangle from a texture to the display, to draw the entire
* texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0.
*/
void cogl_texture_rectangle (CoglHandle handle,
CoglFixed x1,
CoglFixed y1,
CoglFixed x2,
CoglFixed y2,
CoglFixed tx1,
CoglFixed ty1,
CoglFixed tx2,
CoglFixed ty2);
/**
* cogl_texture_polygon:
* @handle: A CoglHandle for a texture
* @n_vertices: The length of the vertices array
* @vertices: An array of #CoglTextureVertex structs
* @use_color: %TRUE if the color member of #CoglTextureVertex should be used
*
* Draws a polygon from a texture with the given model and texture
* coordinates. This can be used to draw arbitrary shapes textured
* with a COGL texture. If @use_color is %TRUE then the current COGL
* color will be changed for each vertex using the value specified in
* the color member of #CoglTextureVertex. This can be used for
* example to make the texture fade out by setting the alpha value of
* the color.
*
* All of the texture coordinates must be in the range [0,1] and
* repeating the texture is not supported.
*
* Because of the way this function is implemented it will currently
* only work if either the texture is not sliced or the backend is not
* OpenGL ES and the minifying and magnifying functions are both set
* to CGL_NEAREST.
*/
void cogl_texture_polygon (CoglHandle handle,
guint n_vertices,
CoglTextureVertex *vertices,
gboolean use_color);
G_END_DECLS
#endif /* __COGL_TEXTURE_H__ */