2503f7b321
This glues CoglMaterial in as the fundamental way that Cogl describes how to fill in geometry. It adds cogl_set_source (), which is used to set the material which will be used by all subsequent drawing functions It adds cogl_set_source_texture as a convenience for setting up a default material with a single texture layer, and cogl_set_source_color is now also a convenience for setting up a material with a solid fill. "drawing functions" include, cogl_rectangle, cogl_texture_rectangle, cogl_texture_multiple_rectangles, cogl_texture_polygon (though the cogl_texture_* funcs have been renamed; see below for details), cogl_path_fill/stroke and cogl_vertex_buffer_draw*. cogl_texture_rectangle, cogl_texture_multiple_rectangles and cogl_texture_polygon no longer take a texture handle; instead the current source material is referenced. The functions have also been renamed to: cogl_rectangle_with_texture_coords, cogl_rectangles_with_texture_coords and cogl_polygon respectivly. Most code that previously did: cogl_texture_rectangle (tex_handle, x, y,...); needs to be changed to now do: cogl_set_source_texture (tex_handle); cogl_rectangle_with_texture_coords (x, y,....); In the less likely case where you were blending your source texture with a color like: cogl_set_source_color4ub (r,g,b,a); /* where r,g,b,a isn't just white */ cogl_texture_rectangle (tex_handle, x, y,...); you will need your own material to do that: mat = cogl_material_new (); cogl_material_set_color4ub (r,g,b,a); cogl_material_set_layer (mat, 0, tex_handle)); cogl_set_source_material (mat); Code that uses the texture coordinates, 0, 0, 1, 1 don't need to use cog_rectangle_with_texure_coords since these are the coordinates that cogl_rectangle will use. For cogl_texture_polygon; as well as dropping the texture handle, the n_vertices and vertices arguments were transposed for consistency. So code previously written as: cogl_texture_polygon (tex_handle, 3, verts, TRUE); need to be written as: cogl_set_source_texture (tex_handle); cogl_polygon (verts, 3, TRUE); All of the unit tests have been updated to now use the material API and test-cogl-material has been renamed to test-cogl-multitexture since any textured quad is now technically a test of CoglMaterial but this test specifically creates a material with multiple texture layers. Note: The GLES backend has not been updated yet; that will be done in a following commit.
510 lines
19 KiB
C
510 lines
19 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
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* to make the texture fit GPU limitations
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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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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* Creates a new COGL texture with the specified dimensions and pixel format.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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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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CoglTextureFlags flags,
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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
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* to make the texture fit GPU limitations
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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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: return location for a #GError or %NULL
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*
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* Creates a COGL texture from an image file.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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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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CoglTextureFlags flags,
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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
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* to make the texture fit GPU limitations
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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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
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* the buffer on the GPU
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* @rowstride: the memory offset in bytes between the starts of
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* scanlines in @data
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* @data: pointer the memory region where the source buffer resides
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*
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* Creates a new COGL texture based on data residing in memory.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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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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CoglTextureFlags flags,
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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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* Creates a COGL texture based on an existing OpenGL texture; the
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* width, height and format are passed along since it is not possible
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* to query this from a handle with GLES 1.0.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 0.8
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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_texture_new_from_bitmap:
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* @bitmap: a #CoglBitmap
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* @max_waste: maximum extra horizontal and|or vertical margin pixels
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* to make the texture fit GPU limitations
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* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
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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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* Creates a COGL texture from a #CoglBitmap.
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*
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* Return value: a #CoglHandle to the newly created texture or
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* %COGL_INVALID_HANDLE on failure
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*
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* Since: 1.0
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*/
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CoglHandle cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
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gint max_waste,
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CoglTextureFlags flags,
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CoglPixelFormat internal_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_bitmap_new_from_file:
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* @filename: the file to load.
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* @error: a #GError or %NULL.
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*
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* Load an image file from disk. This function can be safely called from
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* within a thread.
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*
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* Returns: A #CoglBitmap to the new loaded image data, or %NULL if loading
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* the image failed.
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*
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* Since: 1.0
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*/
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CoglBitmap * cogl_bitmap_new_from_file (const gchar *filename,
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GError **error);
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/**
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* cogl_bitmap_get_size_from_file:
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* @filename: the file to check
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* @width: return location for the bitmap width
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* @height: return location for the bitmap height
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*
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* Parses an image file enough to extract the width and height
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* of the bitmap.
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*
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* Since: 1.0
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*/
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gboolean cogl_bitmap_get_size_from_file (const gchar *filename,
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gint *width,
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gint *height);
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/**
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* cogl_bitmap_free:
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* @bmp: a #CoglBitmap.
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*
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* Frees a #CoglBitmap.
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*/
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void cogl_bitmap_free (CoglBitmap *bmp);
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/**
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* cogl_rectangle_with_texture_coords:
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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 using the current material and supply texture coordinates
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* to be used for the first texture layer of the material. 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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* Since 1.0
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*/
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void cogl_rectangle_with_texture_coords (float x1,
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float y1,
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float x2,
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float y2,
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float tx1,
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float ty1,
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float tx2,
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float ty2);
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/**
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* cogl_rectangle_with_multitexture_coords:
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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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* @tex_coords: An array containing groups of 4 float values:
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* [tx1, ty1, tx2, ty2] that are interpreted as two texture coordinates; one
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* for the upper left texel, and one for the lower right texel. Each value
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* should be between 0.0 and 1.0, where the coordinate (0.0, 0.0) represents
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* the top left of the texture, and (1.0, 1.0) the bottom right.
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* @tex_coords_len: The length of the tex_coords array. (e.g. for one layer
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* and one group of texture coordinates, this would be 4)
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*
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* This function draws a rectangle using the current source material to
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* texture or fill with. As a material may contain multiple texture layers
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* this interface lets you supply texture coordinates for each layer of the
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* material.
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*
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* The first pair of coordinates are for the first layer (with the smallest
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* layer index) and if you supply less texture coordinates than there are
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* layers in the current source material then default texture coordinates
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* (0.0, 0.0, 1.0, 1.0) are generated.
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*
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* Since 1.0
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*/
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void cogl_rectangle_with_multitexture_coords (float x1,
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float y1,
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float x2,
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float y2,
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const float *tex_coords,
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gint tex_coords_len);
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/**
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* cogl_rectangles_with_texture_coords:
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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_rectangle_with_texture_coords() 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_rectangle_with_texture_coords() separately for each rectangle.
|
|
*
|
|
* @verts should point to an array of #float<!-- -->s with
|
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* @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
|
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* meaning as in cogl_rectangle_with_texture_coords().
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|
*
|
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* Since: 0.8.6
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|
*/
|
|
void cogl_rectangles_with_texture_coords (const float *verts,
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|
guint n_rects);
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|
|
|
/**
|
|
* 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__ */
|