/* * Cogl * * An object oriented GL/GLES Abstraction/Utility Layer * * Copyright (C) 2007,2008,2009 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, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ #if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION) #error "Only can be included directly." #endif #ifndef __COGL_TEXTURE_H__ #define __COGL_TEXTURE_H__ G_BEGIN_DECLS #include /** * 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 the texture fit GPU limitations * @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE * @internal_format: the #CoglPixelFormat to use for the GPU storage of the * texture. * * Creates a new COGL texture with the specified dimensions and pixel format. * * Return value: a #CoglHandle to the newly created texture or * %COGL_INVALID_HANDLE on failure * * Since: 0.8 */ CoglHandle cogl_texture_new_with_size (guint width, guint height, gint max_waste, CoglTextureFlags flags, 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 the texture fit GPU limitations * @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE * @internal_format: the #CoglPixelFormat to use for the GPU storage of the * texture * @error: return location for a #GError or %NULL * * Creates a COGL texture from an image file. * * Return value: a #CoglHandle to the newly created texture or * %COGL_INVALID_HANDLE on failure * * Since: 0.8 */ CoglHandle cogl_texture_new_from_file (const gchar *filename, gint max_waste, CoglTextureFlags flags, 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 the texture fit GPU limitations * @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE * @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 * * Creates a new COGL texture based on data residing in memory. * * Return value: a #CoglHandle to the newly created texture or * %COGL_INVALID_HANDLE on failure * * Since: 0.8 */ CoglHandle cogl_texture_new_from_data (guint width, guint height, gint max_waste, CoglTextureFlags flags, 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. * * Creates 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. * * Return value: a #CoglHandle to the newly created texture or * %COGL_INVALID_HANDLE on failure * * Since: 0.8 */ 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_texture_new_from_bitmap: * @bmp_handle: A CoglBitmap handle * @max_waste: maximum extra horizontal and|or vertical margin pixels * to make the texture fit GPU limitations * @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE * @internal_format: the #CoglPixelFormat to use for the GPU storage of the * texture * * Creates a COGL texture from a CoglBitmap. * * Return value: a #CoglHandle to the newly created texture or * %COGL_INVALID_HANDLE on failure * * Since: 1.0 */ CoglHandle cogl_texture_new_from_bitmap (CoglHandle bmp_handle, gint max_waste, CoglTextureFlags flags, CoglPixelFormat internal_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_rectangle_with_texture_coords: * @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 using the current material and supply texture coordinates * to be used for the first texture layer of the material. To draw the entire * texture pass in @tx1=0.0 @ty1=0.0 @tx2=1.0 @ty2=1.0. * * Since 1.0 */ void cogl_rectangle_with_texture_coords (float x1, float y1, float x2, float y2, float tx1, float ty1, float tx2, float ty2); /** * cogl_rectangle_with_multitexture_coords: * @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. * @tex_coords: An array containing groups of 4 float values: * [tx1, ty1, tx2, ty2] that are interpreted as two texture coordinates; one * for the upper left texel, and one for the lower right texel. Each value * should be between 0.0 and 1.0, where the coordinate (0.0, 0.0) represents * the top left of the texture, and (1.0, 1.0) the bottom right. * @tex_coords_len: The length of the tex_coords array. (e.g. for one layer * and one group of texture coordinates, this would be 4) * * This function draws a rectangle using the current source material to * texture or fill with. As a material may contain multiple texture layers * this interface lets you supply texture coordinates for each layer of the * material. * * The first pair of coordinates are for the first layer (with the smallest * layer index) and if you supply less texture coordinates than there are * layers in the current source material then default texture coordinates * (0.0, 0.0, 1.0, 1.0) are generated. * * Since 1.0 */ void cogl_rectangle_with_multitexture_coords (float x1, float y1, float x2, float y2, const float *tex_coords, gint tex_coords_len); /** * cogl_rectangles_with_texture_coords: * @verts: an array of vertices * @n_rects: number of rectangles to draw * * Draws a series of rectangles in the same way that * cogl_rectangle_with_texture_coords() does. In some situations it can give a * significant performance boost to use this function rather than * calling cogl_rectangle_with_texture_coords() separately for each rectangle. * * @verts should point to an array of #floats with * @n_rects * 8 elements. Each group of 8 values corresponds to the * parameters x1, y1, x2, y2, tx1, ty1, tx2 and ty2 and have the same * meaning as in cogl_rectangle_with_texture_coords(). * * Since: 0.8.6 */ void cogl_rectangles_with_texture_coords (const float *verts, guint n_rects); /** * cogl_rectangles: * @verts: an array of vertices * @n_rects: number of rectangles to draw * * Draws a series of rectangles in the same way that * cogl_rectangle() does. In some situations it can give a * significant performance boost to use this function rather than * calling cogl_rectangle() separately for each rectangle. * * @verts should point to an array of #floats with * @n_rects * 4 elements. Each group of 4 values corresponds to the * parameters x1, y1, x2, and y2, and have the same * meaning as in cogl_rectangle(). * * Since: 1.0 */ void cogl_rectangles (const float *verts, guint n_rects); /** * cogl_polygon: * @vertices: An array of #CoglTextureVertex structs * @n_vertices: The length of the vertices array * @use_color: %TRUE if the color member of #CoglTextureVertex should be used * * Draws a convex polygon using the current source material to fill / texture * with according to the texture coordinates passed. * * If @use_color is %TRUE then the 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. * * Since 1.0 */ void cogl_polygon (CoglTextureVertex *vertices, guint n_vertices, gboolean use_color); G_END_DECLS #endif /* __COGL_TEXTURE_H__ */