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

414 lines
15 KiB
C

/*
* 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-context-private.h"
#include "cogl-handle.h"
#include "cogl-primitives.h"
#include "cogl-pipeline-opengl-private.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
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;
case GL_TEXTURE_RECTANGLE_ARB:
/* Texture rectangles already default to GL_LINEAR so nothing
needs to be done */
break;
default:
g_assert_not_reached();
}
}
}
/* OpenGL - unlike GLES - can upload a sub region of pixel data from a larger
* source buffer */
static void
prep_gl_for_pixels_upload_full (CoglContext *ctx,
int pixels_rowstride,
int image_height,
int pixels_src_x,
int pixels_src_y,
int pixels_bpp)
{
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) );
if (cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_3D))
GE( ctx, glPixelStorei (GL_UNPACK_IMAGE_HEIGHT, image_height) );
_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, 0, pixels_bpp);
}
/* OpenGL - unlike GLES - can download pixel data into a sub region of
* a larger destination buffer */
static void
prep_gl_for_pixels_download_full (CoglContext *ctx,
int image_width,
int pixels_rowstride,
int image_height,
int pixels_src_x,
int pixels_src_y,
int pixels_bpp)
{
GE( ctx, glPixelStorei (GL_PACK_ROW_LENGTH, pixels_rowstride / pixels_bpp) );
GE( ctx, glPixelStorei (GL_PACK_SKIP_PIXELS, pixels_src_x) );
GE( ctx, glPixelStorei (GL_PACK_SKIP_ROWS, pixels_src_y) );
if (cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_3D))
GE( ctx, glPixelStorei (GL_PACK_IMAGE_HEIGHT, image_height) );
_cogl_texture_prep_gl_alignment_for_pixels_download (pixels_bpp,
image_width,
pixels_rowstride);
}
static void
_cogl_texture_driver_prep_gl_for_pixels_download (CoglContext *ctx,
int image_width,
int pixels_rowstride,
int pixels_bpp)
{
prep_gl_for_pixels_download_full (ctx,
pixels_rowstride,
image_width,
0 /* image height */,
0, 0, /* pixels_src_x/y */
pixels_bpp);
}
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);
data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (ctx,
cogl_bitmap_get_rowstride (source_bmp),
0,
src_x,
src_y,
bpp);
_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 (source_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)
{
guint8 *data;
CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (ctx,
cogl_bitmap_get_rowstride (source_bmp),
0, 0, 0, bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( ctx, glTexImage2D (gl_target, 0,
internal_gl_format,
cogl_bitmap_get_width (source_bmp),
cogl_bitmap_get_height (source_bmp),
0,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unbind (source_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)
{
guint8 *data;
CoglPixelFormat source_format = cogl_bitmap_get_format (source_bmp);
int bpp = _cogl_pixel_format_get_bytes_per_pixel (source_format);
data = _cogl_bitmap_bind (source_bmp, COGL_BUFFER_ACCESS_READ, 0);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (ctx,
cogl_bitmap_get_rowstride (source_bmp),
(cogl_bitmap_get_height (source_bmp) /
depth),
0, 0, bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( ctx, glTexImage3D (gl_target,
0, /* level */
internal_gl_format,
cogl_bitmap_get_width (source_bmp),
height,
depth,
0,
source_gl_format,
source_gl_type,
data) );
_cogl_bitmap_unbind (source_bmp);
}
static gboolean
_cogl_texture_driver_gl_get_tex_image (CoglContext *ctx,
GLenum gl_target,
GLenum dest_gl_format,
GLenum dest_gl_type,
guint8 *dest)
{
GE (ctx, glGetTexImage (gl_target,
0, /* level */
dest_gl_format,
dest_gl_type,
(GLvoid *)dest));
return TRUE;
}
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)
{
GLenum proxy_target;
GLint new_width = 0;
if (gl_target == GL_TEXTURE_3D)
proxy_target = GL_PROXY_TEXTURE_3D;
else
/* Unknown target, assume it's not supported */
return FALSE;
/* Proxy texture allows for a quick check for supported size */
GE( ctx, glTexImage3D (proxy_target, 0, GL_RGBA,
width, height, depth, 0 /* border */,
gl_format, gl_type, NULL) );
GE( ctx, glGetTexLevelParameteriv (proxy_target, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
static gboolean
_cogl_texture_driver_size_supported (CoglContext *ctx,
GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height)
{
GLenum proxy_target;
GLint new_width = 0;
if (gl_target == GL_TEXTURE_2D)
proxy_target = GL_PROXY_TEXTURE_2D;
#if HAVE_COGL_GL
else if (gl_target == GL_TEXTURE_RECTANGLE_ARB)
proxy_target = GL_PROXY_TEXTURE_RECTANGLE_ARB;
#endif
else
/* Unknown target, assume it's not supported */
return FALSE;
/* Proxy texture allows for a quick check for supported size */
GE( ctx, glTexImage2D (proxy_target, 0, GL_RGBA,
width, height, 0 /* border */,
gl_format, gl_type, NULL) );
GE( ctx, glGetTexLevelParameteriv (proxy_target, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
static void
_cogl_texture_driver_try_setting_gl_border_color
(CoglContext *ctx,
GLuint gl_target,
const GLfloat *transparent_color)
{
/* Use a transparent border color so that we can leave the
color buffer alone when using texture co-ordinates
outside of the texture */
GE( ctx, glTexParameterfv (gl_target, GL_TEXTURE_BORDER_COLOR,
transparent_color) );
}
static gboolean
_cogl_texture_driver_allows_foreign_gl_target (CoglContext *ctx,
GLenum gl_target)
{
/* GL_ARB_texture_rectangle textures are supported if they are
created from foreign because some chipsets have trouble with
GL_ARB_texture_non_power_of_two. There is no Cogl call to create
them directly to emphasize the fact that they don't work fully
(for example, no mipmapping and complicated shader support) */
/* Allow 2-dimensional or rectangle textures only */
if (gl_target != GL_TEXTURE_2D && gl_target != GL_TEXTURE_RECTANGLE_ARB)
return FALSE;
return TRUE;
}
static void
_cogl_texture_driver_gl_generate_mipmaps (CoglContext *ctx,
GLenum gl_target)
{
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)
{
return context->driver_vtable->pixel_format_to_gl (context,
format,
NULL, /* don't need */
closest_gl_format,
closest_gl_type);
}
const CoglTextureDriver
_cogl_texture_driver_gl =
{
_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
};