414 lines
16 KiB
C
414 lines
16 KiB
C
/* cogl-texture.h: Texture objects
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* This file is part of Clutter
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*
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* Copyright (C) 2008 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 <http://www.gnu.org/licenses/>.
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_TEXTURE_H__
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#define __COGL_TEXTURE_H__
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G_BEGIN_DECLS
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#include <cogl/cogl-types.h>
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/**
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* SECTION:cogl-texture
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* @short_description: Fuctions for creating and manipulating textures
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*
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* COGL allows creating and manipulating GL textures using a uniform
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* API that tries to hide all the various complexities of creating,
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* loading and manipulating textures.
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*/
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/**
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* cogl_texture_new_with_size:
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* @width: width of texture in pixels.
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* @height: height of texture in pixels.
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* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
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* texture fit GPU limitations.
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* @auto_mipmap: enable or disable automatic generation of mipmap pyramid
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* from the base level image whenever it is updated.
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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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*
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* Create a new texture with specified dimensions and pixel format.
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*
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* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
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* if texture creation failed.
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*/
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CoglHandle cogl_texture_new_with_size (guint width,
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guint height,
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gint max_waste,
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gboolean auto_mipmap,
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CoglPixelFormat internal_format);
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/**
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* cogl_texture_new_from_file:
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* @filename: the file to load
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* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
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* texture fit GPU limitations.
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* @auto_mipmap: enable or disable automatic generation of mipmap pyramid
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* from the base level image whenever it is updated.
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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 #GError or NULL.
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*
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* Load an image file from disk.
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*
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* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
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* if creating the texture failed.
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*/
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CoglHandle cogl_texture_new_from_file (const gchar *filename,
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gint max_waste,
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gboolean auto_mipmap,
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CoglPixelFormat internal_format,
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GError **error);
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/**
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* cogl_texture_new_from_data:
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* @width: width of texture in pixels.
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* @height: height of texture in pixels.
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* @max_waste: maximum extra horizontal and|or vertical margin pixels to make
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* @auto_mipmap: enable or disable automatic generation of mipmap pyramid
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* from the base level image whenever it is updated.
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* @format: the #CoglPixelFormat the buffer is stored in in RAM
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* @internal_format: the #CoglPixelFormat that will be used for storing the
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* buffer on the GPU.
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* @rowstride: the memory offset in bytes between the starts of scanlines in
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* @data.
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* @data: pointer the memory region where the source buffer resides.
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*
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* Create a new cogl texture based on data residing in memory.
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*
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* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
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* if creating the texture failed.
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*/
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CoglHandle cogl_texture_new_from_data (guint width,
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guint height,
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gint max_waste,
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gboolean auto_mipmap,
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CoglPixelFormat format,
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CoglPixelFormat internal_format,
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guint rowstride,
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const guchar *data);
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/**
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* cogl_texture_new_from_foreign:
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* @gl_handle: opengl target type of foreign texture
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* @gl_target: opengl handle of foreign texture.
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* @width: width of foreign texture
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* @height: height of foreign texture.
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* @x_pot_waste: maximum horizontal waste.
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* @y_pot_waste: maximum vertical waste.
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* @format: format of the foreign texture.
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*
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* Create a cogl texture based on an existing OpenGL texture, the width, height
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* and format are passed along since it is not possible to query this from a
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* handle with GLES 1.0.
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*
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* Returns: a #CoglHandle to the newly created texture or COGL_INVALID_HANDLE
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* if creating the texture failed.
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*/
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CoglHandle cogl_texture_new_from_foreign (GLuint gl_handle,
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GLenum gl_target,
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GLuint width,
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GLuint height,
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GLuint x_pot_waste,
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GLuint y_pot_waste,
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CoglPixelFormat format);
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/**
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* cogl_is_texture:
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* @handle: A CoglHandle
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*
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* Gets whether the given handle references an existing texture object.
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*
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* Returns: %TRUE if the handle references a texture,
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* %FALSE otherwise
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*/
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gboolean cogl_is_texture (CoglHandle handle);
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/**
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* cogl_texture_get_width:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the width of a cogl texture.
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*
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* Returns: the width of the GPU side texture in pixels:
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*/
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guint cogl_texture_get_width (CoglHandle handle);
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/**
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* cogl_texture_get_height:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the height of a cogl texture.
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*
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* Returns: the height of the GPU side texture in pixels:
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*/
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guint cogl_texture_get_height (CoglHandle handle);
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/**
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* cogl_texture_get_format:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the #CoglPixelFormat of a cogl texture.
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*
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* Returns: the #CoglPixelFormat of the GPU side texture.
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*/
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CoglPixelFormat cogl_texture_get_format (CoglHandle handle);
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/**
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* cogl_texture_get_rowstride:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the rowstride of a cogl texture.
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*
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* Returns: the offset in bytes between each consequetive row of pixels.
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*/
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guint cogl_texture_get_rowstride (CoglHandle handle);
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/**
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* cogl_texture_get_max_waste:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the maximum wasted (unused) pixels in one dimension of a GPU side
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* texture.
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*
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* Returns: the maximum waste.
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*/
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gint cogl_texture_get_max_waste (CoglHandle handle);
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/**
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* cogl_texture_get_min_filter:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the currently set downscaling filter for a cogl texture.
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*
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* Returns: the current downscaling filter for a cogl texture.
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*/
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COGLenum cogl_texture_get_min_filter (CoglHandle handle);
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/**
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* cogl_texture_get_mag_filter:
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* @handle: a #CoglHandle for a texture.
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*
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* Query the currently set downscaling filter for a cogl texture.
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*
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* Returns: the current downscaling filter for a cogl texture.
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*/
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COGLenum cogl_texture_get_mag_filter (CoglHandle handle);
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/**
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* cogl_texture_is_sliced:
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* @handle: a #CoglHandle for a texture.
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*
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* Query if a texture is sliced (stored as multiple GPU side tecture
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* objects).
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*
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* Returns: %TRUE if the texture is sliced, %FALSE if the texture
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* is stored as a single GPU texture.
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*/
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gboolean cogl_texture_is_sliced (CoglHandle handle);
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/**
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* cogl_texture_get_gl_texture:
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* @handle: a #CoglHandle for a texture.
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* @out_gl_handle: pointer to return location for the textures GL handle, or
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* NULL.
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* @out_gl_target: pointer to return location for the GL target type, or NULL.
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*
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* Query the GL handles for a GPU side texture through it's #CoglHandle,
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* if the texture is spliced the data for the first sub texture will be
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* queried.
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*
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* Returns: %TRUE if the handle was successfully retrieved %FALSE
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* if the handle was invalid.
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*/
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gboolean cogl_texture_get_gl_texture (CoglHandle handle,
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GLuint *out_gl_handle,
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GLenum *out_gl_target);
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/**
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* cogl_texture_get_data:
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* @handle: a #CoglHandle for a texture.
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* @format: the #CoglPixelFormat to store the texture as.
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* @rowstride: the rowstride of @data or retrieved from texture if none is
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* specified.
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* @data: memory location to write contents of buffer, or %NULL if we're
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* only querying the data size through the return value.
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*
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* Copy the pixel data from a cogl texture to system memory.
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*
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* Returns: the size of the texture data in bytes (or 0 if the texture
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* is not valid.)
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*/
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gint cogl_texture_get_data (CoglHandle handle,
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CoglPixelFormat format,
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guint rowstride,
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guchar *data);
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/**
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* cogl_texture_set_filters:
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* @handle: a #CoglHandle.
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* @min_filter: the filter used when scaling the texture down.
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* @mag_filter: the filter used when magnifying the texture.
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*
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* Changes the decimation and interpolation filters used when the texture is
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* drawn at other scales than 100%.
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*/
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void cogl_texture_set_filters (CoglHandle handle,
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COGLenum min_filter,
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COGLenum mag_filter);
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/**
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* cogl_texture_set_region:
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* @handle: a #CoglHandle.
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* @src_x: upper left coordinate to use from source data.
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* @src_y: upper left coordinate to use from source data.
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* @dst_x: upper left destination horizontal coordinate.
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* @dst_y: upper left destination vertical coordinate.
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* @dst_width: width of destination region to write.
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* @dst_height: height of destination region to write.
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* @width: width of source data buffer.
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* @height: height of source data buffer.
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* @format: the #CoglPixelFormat used in the source buffer.
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* @rowstride: rowstride of source buffer (computed from width if none
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* specified)
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* @data: the actual pixel data.
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*
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* Sets the pixels in a rectangular subregion of @handle from an in-memory
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* buffer containing pixel data.
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*
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* Returns: %TRUE if the subregion upload was successful, otherwise %FALSE.
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*/
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gboolean cogl_texture_set_region (CoglHandle handle,
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gint src_x,
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gint src_y,
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gint dst_x,
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gint dst_y,
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guint dst_width,
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guint dst_height,
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gint width,
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gint height,
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CoglPixelFormat format,
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guint rowstride,
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const guchar *data);
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/**
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* cogl_texture_ref:
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* @handle: a @CoglHandle.
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*
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* Increment the reference count for a cogl texture.
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*
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* Returns: the @handle.
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*/
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CoglHandle cogl_texture_ref (CoglHandle handle);
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/**
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* cogl_texture_unref:
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* @handle: a @CoglHandle.
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*
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* Deccrement the reference count for a cogl texture.
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*/
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void cogl_texture_unref (CoglHandle handle);
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/**
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* cogl_texture_rectangle:
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* @handle: a @CoglHandle.
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* @x1: x coordinate upper left on screen.
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* @y1: y coordinate upper left on screen.
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* @x2: x coordinate lower right on screen.
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* @y2: y coordinate lower right on screen.
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* @tx1: x part of texture coordinate to use for upper left pixel
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* @ty1: y part of texture coordinate to use for upper left pixel
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* @tx2: x part of texture coordinate to use for lower right pixel
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* @ty2: y part of texture coordinate to use for left pixel
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*
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* Draw a rectangle from a texture to the display, to draw the entire
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* texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0.
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*/
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void cogl_texture_rectangle (CoglHandle handle,
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CoglFixed x1,
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CoglFixed y1,
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CoglFixed x2,
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CoglFixed y2,
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CoglFixed tx1,
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CoglFixed ty1,
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CoglFixed tx2,
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CoglFixed ty2);
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/**
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* cogl_texture_polygon:
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* @handle: A CoglHandle for a texture
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* @n_vertices: The length of the vertices array
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* @vertices: An array of #CoglTextureVertex structs
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* @use_color: %TRUE if the color member of #CoglTextureVertex should be used
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*
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* Draws a polygon from a texture with the given model and texture
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* coordinates. This can be used to draw arbitrary shapes textured
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* with a COGL texture. If @use_color is %TRUE then the current COGL
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* color will be changed for each vertex using the value specified in
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* the color member of #CoglTextureVertex. This can be used for
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* example to make the texture fade out by setting the alpha value of
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* the color.
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*
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* All of the texture coordinates must be in the range [0,1] and
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* repeating the texture is not supported.
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*
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* Because of the way this function is implemented it will currently
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* only work if either the texture is not sliced or the backend is not
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* OpenGL ES and the minifying and magnifying functions are both set
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* to CGL_NEAREST.
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*/
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void cogl_texture_polygon (CoglHandle handle,
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guint n_vertices,
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CoglTextureVertex *vertices,
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gboolean use_color);
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/**
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* cogl_texture_multiple_rectangles:
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* @handle: a @CoglHandle.
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* @verts: an array of vertices
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* @n_rects: number of rectangles to draw
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*
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* Draws a series of rectangles in the same way that
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* cogl_texture_rectangle() does. In some situations it can give a
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* significant performance boost to use this function rather than
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* calling cogl_texture_rectangle() separately for each rectangle.
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*
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* @verts should point to an array of #CoglFixed<!-- -->s with
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* @n_rects * 8 elements. Each group of 8 values corresponds to the
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* parameters x1, y1, x2, y2, tx1, ty1, tx2 and ty2 and have the same
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* meaning as in cogl_texture_rectangle().
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*
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* Since: 1.0
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*/
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void cogl_texture_multiple_rectangles
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(CoglHandle handle,
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const CoglFixed *verts,
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guint n_rects);
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G_END_DECLS
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#endif /* __COGL_TEXTURE_H__ */
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