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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 Markus Dahms <mad@automagically.de>
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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __G3D_TEXTURE_H__
#define __G3D_TEXTURE_H__
#include <g3d/types.h>
#ifdef __cplusplus
extern "C" {
#endif /* ifdef __cplusplus */
/**
* SECTION:texture
* @short_description: Texture loading and manipulation
* @include: g3d/texture.h
*
* A texture is an image used in materials. Here are some helper functions,
* mostly for cached loading of a #G3DImage.
*/
/**
* g3d_texture_load_from_stream:
* @context: a valid context
* @model: a valid model or NULL
* @stream: an open stream
*
* Load a texture image from a stream. The file type is determined by the
* extension of the stream URI, so it should be valid. If @model is not NULL
* the texture image is cached (or retrieved from cache if available).
*
* Returns: the texture image or NULL in case of an error.
*/
EAPI
G3DImage *g3d_texture_load_from_stream(G3DContext *context, G3DModel *model,
G3DStream *stream);
/**
* g3d_texture_load_cached:
* @context: a valid context
* @model: a valid model
* @filename: the file name of the texture to load
*
* Loads a texture image from file and attaches it to a hash table in the
* model. On a second try to load this texture it is returned from cache.
*
* Returns: the texture image
*/
EAPI
G3DImage *g3d_texture_load_cached(G3DContext *context, G3DModel *model,
const gchar *filename);
/**
* g3d_texture_free:
* @texture: a texture image
*
* Frees all memory used by this texture image.
*/
EAPI
void g3d_texture_free(G3DImage *texture);
/**
* g3d_texture_prepare:
* @texture: a texture image
*
* Resizes the image to dimensions which are a power of 2 to be
* usable as an OpenGL texture.
* (FIXME: unimplemented)
*
* Returns: TRUE on success, FALSE else
*/
EAPI
gboolean g3d_texture_prepare(G3DImage *texture);
/**
* g3d_texture_flip_y:
* @texture: a texture image
*
* Mirror the image along the x axis - all y coordinates are inverted.
*
* Returns: TRUE on success, FALSE on error.
*/
EAPI
gboolean g3d_texture_flip_y(G3DImage *texture);
/**
* g3d_texture_merge_alpha:
* @image: a texture image or NULL
* @aimage: an image with alpha information
*
* Merges alpha information from @aimage into output image. If @image is NULL a
* new image is created, else @image is returned with alpha from @aimage.
*
* Returns: a texture image or NULL in case of an error.
*/
EAPI
G3DImage *g3d_texture_merge_alpha(G3DImage *image, G3DImage *aimage);
#ifdef __cplusplus
}
#endif /* ifdef __cplusplus */
#endif /* __G3D_TEXTURE_H__ */
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