mutter/cogl/driver/gl/cogl-texture-gl.c

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2012 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, see <http://www.gnu.org/licenses/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include "cogl-context-private.h"
#include "cogl-util-gl-private.h"
#include "cogl-texture-gl-private.h"
#include "cogl-texture-3d-private.h"
#include "cogl-util.h"
#include "cogl-pipeline-opengl-private.h"
static inline int
calculate_alignment (int rowstride)
{
int alignment = 1 << (_cogl_util_ffs (rowstride) - 1);
return MIN (alignment, 8);
}
void
_cogl_texture_gl_prep_alignment_for_pixels_upload (CoglContext *ctx,
int pixels_rowstride)
{
GE( ctx, glPixelStorei (GL_UNPACK_ALIGNMENT,
calculate_alignment (pixels_rowstride)) );
}
void
_cogl_texture_gl_prep_alignment_for_pixels_download (CoglContext *ctx,
int bpp,
int width,
int rowstride)
{
int alignment;
/* If no padding is needed then we can always use an alignment of 1.
* We want to do this even though it is equivalent to the alignment
* of the rowstride because the Intel driver in Mesa currently has
* an optimisation when reading data into a PBO that only works if
* the alignment is exactly 1.
*
* https://bugs.freedesktop.org/show_bug.cgi?id=46632
*/
if (rowstride == bpp * width)
alignment = 1;
else
alignment = calculate_alignment (rowstride);
GE( ctx, glPixelStorei (GL_PACK_ALIGNMENT, alignment) );
}
void
_cogl_texture_gl_flush_legacy_texobj_wrap_modes (CoglTexture *texture,
unsigned int wrap_mode_s,
unsigned int wrap_mode_t,
unsigned int wrap_mode_p)
{
texture->vtable->gl_flush_legacy_texobj_wrap_modes (texture,
wrap_mode_s,
wrap_mode_t,
wrap_mode_p);
}
void
_cogl_texture_gl_flush_legacy_texobj_filters (CoglTexture *texture,
unsigned int min_filter,
unsigned int mag_filter)
{
texture->vtable->gl_flush_legacy_texobj_filters (texture,
min_filter, mag_filter);
}
void
_cogl_texture_gl_maybe_update_max_level (CoglTexture *texture,
int max_level)
{
/* This isn't supported on GLES */
#ifdef HAVE_COGL_GL
CoglContext *ctx = texture->context;
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_TEXTURE_MAX_LEVEL) &&
texture->max_level < max_level)
{
CoglContext *ctx = texture->context;
GLuint gl_handle;
GLenum gl_target;
cogl_texture_get_gl_texture (texture, &gl_handle, &gl_target);
texture->max_level = max_level;
_cogl_bind_gl_texture_transient (gl_target,
gl_handle,
_cogl_texture_is_foreign (texture));
GE( ctx, glTexParameteri (gl_target,
GL_TEXTURE_MAX_LEVEL, texture->max_level));
}
#endif /* HAVE_COGL_GL */
}
void
_cogl_texture_gl_generate_mipmaps (CoglTexture *texture)
{
CoglContext *ctx = texture->context;
int n_levels = _cogl_texture_get_n_levels (texture);
GLuint gl_handle;
GLenum gl_target;
_cogl_texture_gl_maybe_update_max_level (texture, n_levels - 1);
cogl_texture_get_gl_texture (texture, &gl_handle, &gl_target);
_cogl_bind_gl_texture_transient (gl_target,
gl_handle,
_cogl_texture_is_foreign (texture));
GE( ctx, glGenerateMipmap (gl_target) );
}
GLenum
_cogl_texture_gl_get_format (CoglTexture *texture)
{
return texture->vtable->get_gl_format (texture);
}