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mutter/cogl/driver/gles/cogl-texture-driver-gles.c
Neil Roberts ec5009fa23 Use GL_PACK_ALIGNMENT of 1 whenever possible 
The Intel driver currently has an optimisation when calling
glReadPixels into a PBO so that it will use a blit instead of the Mesa
fallback path. However this only works if the GL_PACK_ALIGNMENT is
exactly 1, even if this would be equivalent to a higher alignment
value because the bpp*width is already aligned. To make it more likely
to hit this fast path, we now detect this situation and explicitly use
an alignment of 1. To make this work the texture driver needs to be
passed down the bpp*width as well as the rowstride when configuring
the alignment.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2012-04-05 13:51:56 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 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/>.
*
*
*
* Authors:
* Matthew Allum <mallum@openedhand.com>
* Neil Roberts <neil@linux.intel.com>
* Robert Bragg <robert@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-private.h"
#include "cogl-util.h"
#include "cogl-bitmap.h"
#include "cogl-bitmap-private.h"
#include "cogl-texture-private.h"
#include "cogl-pipeline.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-context-private.h"
#include "cogl-handle.h"
#include "cogl-primitives.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
#ifndef GL_TEXTURE_3D
#define GL_TEXTURE_3D 0x806F
#endif
#ifndef GL_MAX_3D_TEXTURE_SIZE_OES
#define GL_MAX_3D_TEXTURE_SIZE_OES 0x8073
#endif
/* This extension isn't available for GLES 1.1 so these won't be
defined */
#ifndef GL_UNPACK_ROW_LENGTH
#define GL_UNPACK_ROW_LENGTH 0x0CF2
#endif
#ifndef GL_UNPACK_SKIP_ROWS
#define GL_UNPACK_SKIP_ROWS 0x0CF3
#endif
#ifndef GL_UNPACK_SKIP_PIXELS
#define GL_UNPACK_SKIP_PIXELS 0x0CF4
#endif
static void
_cogl_texture_driver_gen (CoglContext *ctx,
GLenum gl_target,
GLsizei n,
GLuint *textures)
{
unsigned int i;
GE (ctx, glGenTextures (n, textures));
for (i = 0; i < n; i++)
{
_cogl_bind_gl_texture_transient (gl_target, textures[i], FALSE);
switch (gl_target)
{
case GL_TEXTURE_2D:
case GL_TEXTURE_3D:
/* GL_TEXTURE_MAG_FILTER defaults to GL_LINEAR, no need to set it */
GE( ctx, glTexParameteri (gl_target,
GL_TEXTURE_MIN_FILTER,
GL_LINEAR) );
break;
default:
g_assert_not_reached();
}
}
}
static void
prep_gl_for_pixels_upload_full (CoglContext *ctx,
int pixels_rowstride,
int pixels_src_x,
int pixels_src_y,
int pixels_bpp)
{
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE))
{
GE( ctx, glPixelStorei (GL_UNPACK_ROW_LENGTH,
pixels_rowstride / pixels_bpp) );
GE( ctx, glPixelStorei (GL_UNPACK_SKIP_PIXELS, pixels_src_x) );
GE( ctx, glPixelStorei (GL_UNPACK_SKIP_ROWS, pixels_src_y) );
}
else
{
g_assert (pixels_src_x == 0);
g_assert (pixels_src_y == 0);
}
_cogl_texture_prep_gl_alignment_for_pixels_upload (pixels_rowstride);
}
static void
_cogl_texture_driver_prep_gl_for_pixels_upload (CoglContext *ctx,
int pixels_rowstride,
int pixels_bpp)
{
prep_gl_for_pixels_upload_full (ctx,
pixels_rowstride,
0, 0, /* src_x/y */
pixels_bpp);
}
static void
_cogl_texture_driver_prep_gl_for_pixels_download (CoglContext *ctx,
int pixels_rowstride,
int image_width,
int pixels_bpp)
{
_cogl_texture_prep_gl_alignment_for_pixels_download (pixels_bpp,
image_width,
pixels_rowstride);
}
static CoglBitmap *
prepare_bitmap_alignment_for_upload (CoglContext *ctx,
CoglBitmap *src_bmp)
{
CoglPixelFormat format = cogl_bitmap_get_format (src_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (format);
int src_rowstride = cogl_bitmap_get_rowstride (src_bmp);
int width = cogl_bitmap_get_width (src_bmp);
int alignment = 1;
if ((ctx->private_feature_flags & COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE) ||
src_rowstride == 0)
return cogl_object_ref (src_bmp);
/* Work out the alignment of the source rowstride */
alignment = 1 << (_cogl_util_ffs (src_rowstride) - 1);
alignment = MIN (alignment, 8);
/* If the aligned data equals the rowstride then we can upload from
the bitmap directly using GL_UNPACK_ALIGNMENT */
if (((width * bpp + alignment - 1) & ~(alignment - 1)) == src_rowstride)
return cogl_object_ref (src_bmp);
/* Otherwise we need to copy the bitmap to pack the alignment
because GLES has no GL_ROW_LENGTH */
else
return _cogl_bitmap_copy (src_bmp);
}
static void
_cogl_texture_driver_upload_subregion_to_gl (CoglContext *ctx,
GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
int src_x,
int src_y,
int dst_x,
int dst_y,
int width,
int height,
CoglBitmap *source_bmp,
GLuint source_gl_format,
GLuint source_gl_type)
{
guint8 *data;
CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
CoglBitmap *slice_bmp;
int rowstride;
/* If we have the GL_EXT_unpack_subimage extension then we can
upload from subregions directly. Otherwise we may need to copy
the bitmap */
if (!(ctx->private_feature_flags & COGL_PRIVATE_FEATURE_UNPACK_SUBIMAGE) &&
(src_x != 0 || src_y != 0 ||
width != cogl_bitmap_get_width (source_bmp) ||
height != cogl_bitmap_get_height (source_bmp)))
{
slice_bmp =
_cogl_bitmap_new_with_malloc_buffer (ctx,
width, height,
source_format);
_cogl_bitmap_copy_subregion (source_bmp,
slice_bmp,
src_x, src_y,
0, 0, /* dst_x/y */
width, height);
}
else
slice_bmp = prepare_bitmap_alignment_for_upload (ctx, source_bmp);
rowstride = cogl_bitmap_get_rowstride (slice_bmp);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (ctx, rowstride, src_x, src_y, bpp);
data = _cogl_bitmap_bind (slice_bmp, COGL_BUFFER_ACCESS_READ, 0);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( ctx, glTexSubImage2D (gl_target, 0,
dst_x, dst_y,
width, height,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unbind (slice_bmp);
cogl_object_unref (slice_bmp);
}
static void
_cogl_texture_driver_upload_to_gl (CoglContext *ctx,
GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
CoglBitmap *source_bmp,
GLint internal_gl_format,
GLuint source_gl_format,
GLuint source_gl_type)
{
CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
int rowstride;
int bmp_width = cogl_bitmap_get_width (source_bmp);
int bmp_height = cogl_bitmap_get_height (source_bmp);
CoglBitmap *bmp;
guint8 *data;
bmp = prepare_bitmap_alignment_for_upload (ctx, source_bmp);
rowstride = cogl_bitmap_get_rowstride (bmp);
/* Setup gl alignment to match rowstride and top-left corner */
_cogl_texture_driver_prep_gl_for_pixels_upload (ctx, rowstride, bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
data = _cogl_bitmap_bind (bmp, COGL_BUFFER_ACCESS_READ, 0);
GE( ctx, glTexImage2D (gl_target, 0,
internal_gl_format,
bmp_width, bmp_height,
0,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unbind (bmp);
cogl_object_unref (bmp);
}
static void
_cogl_texture_driver_upload_to_gl_3d (CoglContext *ctx,
GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
GLint height,
GLint depth,
CoglBitmap *source_bmp,
GLint internal_gl_format,
GLuint source_gl_format,
GLuint source_gl_type)
{
CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
int rowstride = cogl_bitmap_get_rowstride (source_bmp);
int bmp_width = cogl_bitmap_get_width (source_bmp);
int bmp_height = cogl_bitmap_get_height (source_bmp);
guint8 *data;
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
/* If the rowstride or image height can't be specified with just
GL_ALIGNMENT alone then we need to copy the bitmap because there
is no GL_ROW_LENGTH */
if (rowstride / bpp != bmp_width ||
height != bmp_height / depth)
{
CoglBitmap *bmp;
int image_height = bmp_height / depth;
CoglPixelFormat source_bmp_format = cogl_bitmap_get_format (source_bmp);
int i;
_cogl_texture_driver_prep_gl_for_pixels_upload (ctx, bmp_width * bpp, bpp);
/* Initialize the texture with empty data and then upload each
image with a sub-region update */
GE( ctx, glTexImage3D (gl_target,
0, /* level */
internal_gl_format,
bmp_width,
height,
depth,
0,
source_gl_format,
source_gl_type,
NULL) );
bmp = _cogl_bitmap_new_with_malloc_buffer (ctx,
bmp_width,
height,
source_bmp_format);
for (i = 0; i < depth; i++)
{
_cogl_bitmap_copy_subregion (source_bmp,
bmp,
0, image_height * i,
0, 0,
bmp_width,
height);
data = _cogl_bitmap_bind (bmp,
COGL_BUFFER_ACCESS_READ, 0);
GE( ctx, glTexSubImage3D (gl_target,
0, /* level */
0, /* xoffset */
0, /* yoffset */
i, /* zoffset */
bmp_width, /* width */
height, /* height */
1, /* depth */
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unbind (bmp);
}
cogl_object_unref (bmp);
}
else
{
data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
_cogl_texture_driver_prep_gl_for_pixels_upload (ctx, rowstride, bpp);
GE( ctx, glTexImage3D (gl_target,
0, /* level */
internal_gl_format,
bmp_width,
height,
depth,
0,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unbind (source_bmp);
}
}
/* NB: GLES doesn't support glGetTexImage2D, so cogl-texture will instead
* fallback to a generic render + readpixels approach to downloading
* texture data. (See _cogl_texture_draw_and_read() ) */
static gboolean
_cogl_texture_driver_gl_get_tex_image (CoglContext *ctx,
GLenum gl_target,
GLenum dest_gl_format,
GLenum dest_gl_type,
guint8 *dest)
{
return FALSE;
}
static gboolean
_cogl_texture_driver_size_supported_3d (CoglContext *ctx,
GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height,
int depth)
{
GLint max_size;
/* GLES doesn't support a proxy texture target so let's at least
check whether the size is greater than
GL_MAX_3D_TEXTURE_SIZE_OES */
GE( ctx, glGetIntegerv (GL_MAX_3D_TEXTURE_SIZE_OES, &max_size) );
return width <= max_size && height <= max_size && depth <= max_size;
}
static gboolean
_cogl_texture_driver_size_supported (CoglContext *ctx,
GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height)
{
GLint max_size;
/* GLES doesn't support a proxy texture target so let's at least
check whether the size is greater than GL_MAX_TEXTURE_SIZE */
GE( ctx, glGetIntegerv (GL_MAX_TEXTURE_SIZE, &max_size) );
return width <= max_size && height <= max_size;
}
static void
_cogl_texture_driver_try_setting_gl_border_color
(CoglContext *ctx,
GLuint gl_target,
const GLfloat *transparent_color)
{
/* FAIL! */
}
static gboolean
_cogl_texture_driver_allows_foreign_gl_target (CoglContext *ctx,
GLenum gl_target)
{
/* Allow 2-dimensional textures only */
if (gl_target != GL_TEXTURE_2D)
return FALSE;
return TRUE;
}
static void
_cogl_texture_driver_gl_generate_mipmaps (CoglContext *ctx,
GLenum gl_target)
{
if (ctx->driver == COGL_DRIVER_GLES2)
GE( ctx, glGenerateMipmap (gl_target) );
}
static CoglPixelFormat
_cogl_texture_driver_find_best_gl_get_data_format
(CoglContext *context,
CoglPixelFormat format,
GLenum *closest_gl_format,
GLenum *closest_gl_type)
{
/* Find closest format that's supported by GL
(Can't use _cogl_pixel_format_to_gl since available formats
when reading pixels on GLES are severely limited) */
*closest_gl_format = GL_RGBA;
*closest_gl_type = GL_UNSIGNED_BYTE;
return COGL_PIXEL_FORMAT_RGBA_8888;
}
const CoglTextureDriver
_cogl_texture_driver_gles =
{
_cogl_texture_driver_gen,
_cogl_texture_driver_prep_gl_for_pixels_upload,
_cogl_texture_driver_upload_subregion_to_gl,
_cogl_texture_driver_upload_to_gl,
_cogl_texture_driver_upload_to_gl_3d,
_cogl_texture_driver_prep_gl_for_pixels_download,
_cogl_texture_driver_gl_get_tex_image,
_cogl_texture_driver_size_supported,
_cogl_texture_driver_size_supported_3d,
_cogl_texture_driver_try_setting_gl_border_color,
_cogl_texture_driver_allows_foreign_gl_target,
_cogl_texture_driver_gl_generate_mipmaps,
_cogl_texture_driver_find_best_gl_get_data_format
};
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