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/*
* texture rectangle
*
* A small utility function to help create a rectangle texture
*
* Authored By Neil Roberts <neil@linux.intel.com>
*
* Copyright (C) 2011 Intel Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <config.h>
#include "meta-texture-rectangle.h"
#ifdef GL_TEXTURE_RECTANGLE_ARB
static void (* pf_glGetIntegerv) (GLenum pname, GLint *params);
static void (* pf_glTexImage2D) (GLenum target, GLint level,
GLint internalFormat,
GLsizei width, GLsizei height,
GLint border, GLenum format, GLenum type,
const GLvoid *pixels);
static void (* pf_glGenTextures) (GLsizei n, GLuint *textures);
static void (* pf_glDeleteTextures) (GLsizei n, const GLuint *texture);
static void (* pf_glBindTexture) (GLenum target, GLuint texture);
static void
rectangle_texture_destroy_cb (void *user_data)
{
GLuint tex = GPOINTER_TO_UINT (user_data);
pf_glDeleteTextures (1, &tex);
}
#endif /* GL_TEXTURE_RECTANGLE_ARB */
CoglHandle
meta_texture_rectangle_new (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format,
GLenum internal_gl_format,
GLenum internal_format,
unsigned int rowstride,
const guint8 *data)
{
CoglHandle cogl_tex = COGL_INVALID_HANDLE;
#ifdef GL_TEXTURE_RECTANGLE_ARB
static CoglUserDataKey user_data_key;
GLint old_binding;
GLuint tex;
if (pf_glGenTextures == NULL)
{
pf_glGetIntegerv = (void *) cogl_get_proc_address ("glGetIntegerv");
pf_glTexImage2D = (void *) cogl_get_proc_address ("glTexImage2D");
pf_glGenTextures = (void *) cogl_get_proc_address ("glGenTextures");
pf_glDeleteTextures = (void *) cogl_get_proc_address ("glDeleteTextures");
pf_glBindTexture = (void *) cogl_get_proc_address ("glBindTexture");
}
pf_glGenTextures (1, &tex);
pf_glGetIntegerv (GL_TEXTURE_BINDING_RECTANGLE_ARB, &old_binding);
pf_glBindTexture (GL_TEXTURE_RECTANGLE_ARB, tex);
pf_glTexImage2D (GL_TEXTURE_RECTANGLE_ARB, 0,
internal_gl_format, width, height,
0, internal_gl_format,
GL_UNSIGNED_BYTE, NULL);
pf_glBindTexture (GL_TEXTURE_RECTANGLE_ARB, old_binding);
cogl_tex = cogl_texture_new_from_foreign (tex,
GL_TEXTURE_RECTANGLE_ARB,
width, height,
0, 0, /* no waste */
internal_format);
/* Cogl won't destroy the GL texture when a foreign texture is used
so we need to destroy it manually. We can set a destroy
notification callback to do this transparently */
cogl_object_set_user_data (cogl_tex,
&user_data_key,
GUINT_TO_POINTER (tex),
rectangle_texture_destroy_cb);
/* Use cogl_texture_set_region instead of uploading the data
directly with GL calls so that we can let Cogl deal with setting
the pixel store parameters and handling format conversion */
if (data)
cogl_texture_set_region (cogl_tex,
0, 0, /* src x/y */
0, 0, /* dst x/y */
width, height, /* dst width/height */
width, height, /* src width/height */
format,
rowstride,
data);
#endif /* GL_TEXTURE_RECTANGLE_ARB */
return cogl_tex;
}