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mutter/src/compositor/meta-texture-rectangle.c

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Use a utility function to create GL_ARB_texture_rectangles meta-texture-rectangle and meta-shaped-texture both create textures with GL_TEXTURE_RECTANGLE_ARB as the target using direct GL calls. This patch moves that code into a shared utility function in a separate file instead. The function resolves the required GL symbols dynamically instead of linking to them directly so that if Clutter eventually stops linking to -lGL mutter will continue to build. The function also splits the texture creation into a separate texture creation and data upload stage so that it can use cogl_texture_set_region to upload the data. That way it can avoid clobbering the glPixelStore state and it can let Cogl do any necessary format conversion. The code preserves the old value of the rectangle texture binding instead of clobbering it because Cogl expects to be able to cache this value to avoid redundant glBindTexture calls. Finally, the function uses cogl_object_set_data to automatically destroy the GL texture when the Cogl texture is destroyed. This avoids having to have special code to destroy the cogl texture. https://bugzilla.gnome.org/show_bug.cgi?id=654569
2011-07-13 10:47:10 -04:00
/*
* texture rectangle
*
* A small utility function to help create a rectangle texture
*
* Authored By Neil Roberts <neil@linux.intel.com>
*
meta-texture-rectangle: Use Cogl's API to create a rectangle texture Cogl now has public experimental API to create a rectangle texture which we can use instead of creating a foreign texture with GL. This avoids Mutter depending on Cogl including a GL header from its public headers which it might not do in future. https://bugzilla.gnome.org/show_bug.cgi?id=672711
2012-03-23 14:51:25 -04:00
* Copyright (C) 2011, 2012 Intel Corporation
Use a utility function to create GL_ARB_texture_rectangles meta-texture-rectangle and meta-shaped-texture both create textures with GL_TEXTURE_RECTANGLE_ARB as the target using direct GL calls. This patch moves that code into a shared utility function in a separate file instead. The function resolves the required GL symbols dynamically instead of linking to them directly so that if Clutter eventually stops linking to -lGL mutter will continue to build. The function also splits the texture creation into a separate texture creation and data upload stage so that it can use cogl_texture_set_region to upload the data. That way it can avoid clobbering the glPixelStore state and it can let Cogl do any necessary format conversion. The code preserves the old value of the rectangle texture binding instead of clobbering it because Cogl expects to be able to cache this value to avoid redundant glBindTexture calls. Finally, the function uses cogl_object_set_data to automatically destroy the GL texture when the Cogl texture is destroyed. This avoids having to have special code to destroy the cogl texture. https://bugzilla.gnome.org/show_bug.cgi?id=654569
2011-07-13 10:47:10 -04:00
*
* 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
Changed obsolete FSF postal address into generic URL. Fix https://bugzilla.gnome.org/show_bug.cgi?id=721517 #2
2014-01-11 20:42:06 -05:00
* along with this program; if not, see <http://www.gnu.org/licenses/>.
Use a utility function to create GL_ARB_texture_rectangles meta-texture-rectangle and meta-shaped-texture both create textures with GL_TEXTURE_RECTANGLE_ARB as the target using direct GL calls. This patch moves that code into a shared utility function in a separate file instead. The function resolves the required GL symbols dynamically instead of linking to them directly so that if Clutter eventually stops linking to -lGL mutter will continue to build. The function also splits the texture creation into a separate texture creation and data upload stage so that it can use cogl_texture_set_region to upload the data. That way it can avoid clobbering the glPixelStore state and it can let Cogl do any necessary format conversion. The code preserves the old value of the rectangle texture binding instead of clobbering it because Cogl expects to be able to cache this value to avoid redundant glBindTexture calls. Finally, the function uses cogl_object_set_data to automatically destroy the GL texture when the Cogl texture is destroyed. This avoids having to have special code to destroy the cogl texture. https://bugzilla.gnome.org/show_bug.cgi?id=654569
2011-07-13 10:47:10 -04:00
*/
#include <config.h>
meta-texture-rectangle: Use Cogl's API to create a rectangle texture Cogl now has public experimental API to create a rectangle texture which we can use instead of creating a foreign texture with GL. This avoids Mutter depending on Cogl including a GL header from its public headers which it might not do in future. https://bugzilla.gnome.org/show_bug.cgi?id=672711
2012-03-23 14:51:25 -04:00
#include <clutter/clutter.h>
#include "meta-texture-rectangle.h"
Use a utility function to create GL_ARB_texture_rectangles meta-texture-rectangle and meta-shaped-texture both create textures with GL_TEXTURE_RECTANGLE_ARB as the target using direct GL calls. This patch moves that code into a shared utility function in a separate file instead. The function resolves the required GL symbols dynamically instead of linking to them directly so that if Clutter eventually stops linking to -lGL mutter will continue to build. The function also splits the texture creation into a separate texture creation and data upload stage so that it can use cogl_texture_set_region to upload the data. That way it can avoid clobbering the glPixelStore state and it can let Cogl do any necessary format conversion. The code preserves the old value of the rectangle texture binding instead of clobbering it because Cogl expects to be able to cache this value to avoid redundant glBindTexture calls. Finally, the function uses cogl_object_set_data to automatically destroy the GL texture when the Cogl texture is destroyed. This avoids having to have special code to destroy the cogl texture. https://bugzilla.gnome.org/show_bug.cgi?id=654569
2011-07-13 10:47:10 -04:00
meta-texture-rectangle: Use Cogl's API to create a rectangle texture Cogl now has public experimental API to create a rectangle texture which we can use instead of creating a foreign texture with GL. This avoids Mutter depending on Cogl including a GL header from its public headers which it might not do in future. https://bugzilla.gnome.org/show_bug.cgi?id=672711
2012-03-23 14:51:25 -04:00
static void
texture_rectangle_check_cb (CoglTexture *sub_texture,
const float *sub_texture_coords,
const float *meta_coords,
void *user_data)
{
gboolean *result = user_data;
if (cogl_is_texture_rectangle (sub_texture))
*result = TRUE;
}
/* Determines if the given texture is using a rectangle texture as its
* primitive texture type. Eventually this function could be replaced
* with cogl_texture_get_type if Cogl makes that public.
*
* http://git.gnome.org/browse/cogl/commit/?h=8012eee31
*/
gboolean
meta_texture_rectangle_check (CoglTexture *texture)
{
gboolean result = FALSE;
cogl_meta_texture_foreach_in_region (COGL_META_TEXTURE (texture),
0.0f, 0.0f, /* tx_1 / ty_1 */
1.0f, 1.0f, /* tx_2 / ty_2 */
COGL_PIPELINE_WRAP_MODE_REPEAT,
COGL_PIPELINE_WRAP_MODE_REPEAT,
texture_rectangle_check_cb,
&result);
Use a utility function to create GL_ARB_texture_rectangles meta-texture-rectangle and meta-shaped-texture both create textures with GL_TEXTURE_RECTANGLE_ARB as the target using direct GL calls. This patch moves that code into a shared utility function in a separate file instead. The function resolves the required GL symbols dynamically instead of linking to them directly so that if Clutter eventually stops linking to -lGL mutter will continue to build. The function also splits the texture creation into a separate texture creation and data upload stage so that it can use cogl_texture_set_region to upload the data. That way it can avoid clobbering the glPixelStore state and it can let Cogl do any necessary format conversion. The code preserves the old value of the rectangle texture binding instead of clobbering it because Cogl expects to be able to cache this value to avoid redundant glBindTexture calls. Finally, the function uses cogl_object_set_data to automatically destroy the GL texture when the Cogl texture is destroyed. This avoids having to have special code to destroy the cogl texture. https://bugzilla.gnome.org/show_bug.cgi?id=654569
2011-07-13 10:47:10 -04:00
meta-texture-rectangle: Use Cogl's API to create a rectangle texture Cogl now has public experimental API to create a rectangle texture which we can use instead of creating a foreign texture with GL. This avoids Mutter depending on Cogl including a GL header from its public headers which it might not do in future. https://bugzilla.gnome.org/show_bug.cgi?id=672711
2012-03-23 14:51:25 -04:00
return result;
Use a utility function to create GL_ARB_texture_rectangles meta-texture-rectangle and meta-shaped-texture both create textures with GL_TEXTURE_RECTANGLE_ARB as the target using direct GL calls. This patch moves that code into a shared utility function in a separate file instead. The function resolves the required GL symbols dynamically instead of linking to them directly so that if Clutter eventually stops linking to -lGL mutter will continue to build. The function also splits the texture creation into a separate texture creation and data upload stage so that it can use cogl_texture_set_region to upload the data. That way it can avoid clobbering the glPixelStore state and it can let Cogl do any necessary format conversion. The code preserves the old value of the rectangle texture binding instead of clobbering it because Cogl expects to be able to cache this value to avoid redundant glBindTexture calls. Finally, the function uses cogl_object_set_data to automatically destroy the GL texture when the Cogl texture is destroyed. This avoids having to have special code to destroy the cogl texture. https://bugzilla.gnome.org/show_bug.cgi?id=654569
2011-07-13 10:47:10 -04:00
}
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