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mutter/clutter/cogl/cogl-texture.h
Robert Bragg d5fc61102f [cogl] Only expose CoglBitmap as a CoglHandle 
It was inconsistent that we exposed the CoglBitmap struct instead of an
opaque CoglHandle.
2009-05-02 04:12:26 +01:00

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/*
* 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 <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 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 #float<!-- -->s 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 #float<!-- -->s 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__ */
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