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mutter/cogl/cogl-texture-rectangle.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) 2010 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:
* Neil Roberts <neil@linux.intel.com>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "cogl-private.h"
#include "cogl-util.h"
#include "cogl-texture-private.h"
#include "cogl-texture-rectangle-private.h"
#include "cogl-texture-driver.h"
#include "cogl-context-private.h"
#include "cogl-handle.h"
#include "cogl-journal-private.h"
#include "cogl-pipeline-opengl-private.h"
#include <string.h>
#include <math.h>
/* These aren't defined under GLES */
#ifndef GL_TEXTURE_RECTANGLE_ARB
#define GL_TEXTURE_RECTANGLE_ARB 0x84F5
#endif
#ifndef GL_CLAMP
#define GL_CLAMP 0x2900
#endif
#ifndef GL_CLAMP_TO_BORDER
#define GL_CLAMP_TO_BORDER 0x812D
#endif
static void _cogl_texture_rectangle_free (CoglTextureRectangle *tex_rect);
COGL_TEXTURE_DEFINE (TextureRectangle, texture_rectangle);
static const CoglTextureVtable cogl_texture_rectangle_vtable;
static gboolean
can_use_wrap_mode (GLenum wrap_mode)
{
return (wrap_mode == GL_CLAMP ||
wrap_mode == GL_CLAMP_TO_EDGE ||
wrap_mode == GL_CLAMP_TO_BORDER);
}
static void
_cogl_texture_rectangle_set_wrap_mode_parameters (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Only set the wrap mode if it's different from the current value
to avoid too many GL calls. Texture rectangle doesn't make use of
the r coordinate so we can ignore its wrap mode */
if (tex_rect->wrap_mode_s != wrap_mode_s ||
tex_rect->wrap_mode_t != wrap_mode_t)
{
g_assert (can_use_wrap_mode (wrap_mode_s));
g_assert (can_use_wrap_mode (wrap_mode_t));
_cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
tex_rect->is_foreign);
GE( ctx, glTexParameteri (GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_WRAP_S, wrap_mode_s) );
GE( ctx, glTexParameteri (GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_WRAP_T, wrap_mode_t) );
tex_rect->wrap_mode_s = wrap_mode_s;
tex_rect->wrap_mode_t = wrap_mode_t;
}
}
static void
_cogl_texture_rectangle_free (CoglTextureRectangle *tex_rect)
{
if (!tex_rect->is_foreign)
_cogl_delete_gl_texture (tex_rect->gl_texture);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (tex_rect));
}
static gboolean
_cogl_texture_rectangle_can_create (unsigned int width,
unsigned int height,
CoglPixelFormat internal_format,
GError **error)
{
GLenum gl_intformat;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, FALSE);
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_RECTANGLE))
{
g_set_error (error,
COGL_TEXTURE_ERROR,
COGL_TEXTURE_ERROR_TYPE,
"The CoglTextureRectangle feature isn't available");
return FALSE;
}
ctx->driver_vtable->pixel_format_to_gl (ctx,
internal_format,
&gl_intformat,
NULL,
&gl_type);
/* Check that the driver can create a texture with that size */
if (!ctx->texture_driver->size_supported (ctx,
GL_TEXTURE_RECTANGLE_ARB,
gl_intformat,
gl_type,
width,
height))
{
g_set_error (error,
COGL_TEXTURE_ERROR,
COGL_TEXTURE_ERROR_SIZE,
"The requested texture size + format is unsupported");
return FALSE;
}
return TRUE;
}
static void
_cogl_texture_rectangle_set_auto_mipmap (CoglTexture *tex,
gboolean value)
{
/* Rectangle textures currently never support mipmapping so there's
no point in doing anything here */
}
static CoglTextureRectangle *
_cogl_texture_rectangle_create_base (unsigned int width,
unsigned int height,
CoglPixelFormat internal_format)
{
CoglTextureRectangle *tex_rect = g_new (CoglTextureRectangle, 1);
CoglTexture *tex = COGL_TEXTURE (tex_rect);
_cogl_texture_init (tex, &cogl_texture_rectangle_vtable);
tex_rect->width = width;
tex_rect->height = height;
/* We default to GL_LINEAR for both filters */
tex_rect->min_filter = GL_LINEAR;
tex_rect->mag_filter = GL_LINEAR;
/* Wrap mode not yet set */
tex_rect->wrap_mode_s = GL_FALSE;
tex_rect->wrap_mode_t = GL_FALSE;
tex_rect->format = internal_format;
return tex_rect;
}
CoglTextureRectangle *
cogl_texture_rectangle_new_with_size (CoglContext *ctx,
int width,
int height,
CoglPixelFormat internal_format,
GError **error)
{
CoglTextureRectangle *tex_rect;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
/* Since no data, we need some internal format */
if (internal_format == COGL_PIXEL_FORMAT_ANY)
internal_format = COGL_PIXEL_FORMAT_RGBA_8888_PRE;
if (!_cogl_texture_rectangle_can_create (width, height,
internal_format, error))
return NULL;
internal_format = ctx->driver_vtable->pixel_format_to_gl (ctx,
internal_format,
&gl_intformat,
&gl_format,
&gl_type);
tex_rect = _cogl_texture_rectangle_create_base (width, height,
internal_format);
ctx->texture_driver->gen (ctx,
GL_TEXTURE_RECTANGLE_ARB,
1, /* num textures */
&tex_rect->gl_texture);
_cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
tex_rect->is_foreign);
GE( ctx, glTexImage2D (GL_TEXTURE_RECTANGLE_ARB, 0, gl_intformat,
width, height, 0, gl_format, gl_type, NULL) );
return _cogl_texture_rectangle_object_new (tex_rect);
}
CoglTextureRectangle *
cogl_texture_rectangle_new_from_bitmap (CoglBitmap *bmp,
CoglPixelFormat internal_format,
GError **error)
{
CoglTextureRectangle *tex_rect;
CoglBitmap *dst_bmp;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
CoglContext *ctx;
_COGL_RETURN_VAL_IF_FAIL (cogl_is_bitmap (bmp), NULL);
ctx = _cogl_bitmap_get_context (bmp);
internal_format =
_cogl_texture_determine_internal_format (cogl_bitmap_get_format (bmp),
internal_format);
if (!_cogl_texture_rectangle_can_create (cogl_bitmap_get_width (bmp),
cogl_bitmap_get_height (bmp),
internal_format,
error))
return NULL;
dst_bmp = _cogl_texture_prepare_for_upload (bmp,
internal_format,
&internal_format,
&gl_intformat,
&gl_format,
&gl_type);
if (dst_bmp == NULL)
return NULL;
tex_rect = _cogl_texture_rectangle_create_base (cogl_bitmap_get_width (bmp),
cogl_bitmap_get_height (bmp),
internal_format);
ctx->texture_driver->gen (ctx,
GL_TEXTURE_RECTANGLE_ARB,
1, /* num textures */
&tex_rect->gl_texture);
ctx->texture_driver->upload_to_gl (ctx,
GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE,
dst_bmp,
gl_intformat,
gl_format,
gl_type);
tex_rect->gl_format = gl_intformat;
cogl_object_unref (dst_bmp);
return _cogl_texture_rectangle_object_new (tex_rect);
}
CoglTextureRectangle *
_cogl_texture_rectangle_new_from_foreign (GLuint gl_handle,
GLuint width,
GLuint height,
CoglPixelFormat format)
{
/* NOTE: width, height and internal format are not queriable
* in GLES, hence such a function prototype.
*/
GLenum gl_error = 0;
GLint gl_compressed = GL_FALSE;
GLenum gl_int_format = 0;
CoglTextureRectangle *tex_rect;
_COGL_GET_CONTEXT (ctx, NULL);
if (!ctx->texture_driver->allows_foreign_gl_target (ctx,
GL_TEXTURE_RECTANGLE_ARB))
return NULL;
/* Make sure it is a valid GL texture object */
if (!ctx->glIsTexture (gl_handle))
return NULL;
/* Make sure binding succeeds */
while ((gl_error = ctx->glGetError ()) != GL_NO_ERROR)
;
_cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB, gl_handle, TRUE);
if (ctx->glGetError () != GL_NO_ERROR)
return NULL;
/* Obtain texture parameters */
#if HAVE_COGL_GL
if (ctx->driver == COGL_DRIVER_GL)
{
GLint val;
GE( ctx, glGetTexLevelParameteriv (GL_TEXTURE_RECTANGLE_ARB, 0,
GL_TEXTURE_COMPRESSED,
&gl_compressed) );
GE( ctx, glGetTexLevelParameteriv (GL_TEXTURE_RECTANGLE_ARB, 0,
GL_TEXTURE_INTERNAL_FORMAT,
&val) );
gl_int_format = val;
/* If we can query GL for the actual pixel format then we'll ignore
the passed in format and use that. */
if (!ctx->driver_vtable->pixel_format_from_gl_internal (ctx,
gl_int_format,
&format))
return NULL;
}
else
#endif
{
/* Otherwise we'll assume we can derive the GL format from the
passed in format */
ctx->driver_vtable->pixel_format_to_gl (ctx,
format,
&gl_int_format,
NULL,
NULL);
}
/* Note: We always trust the given width and height without querying
* the texture object because the user may be creating a Cogl
* texture for a texture_from_pixmap object where glTexImage2D may
* not have been called and the texture_from_pixmap spec doesn't
* clarify that it is reliable to query back the size from OpenGL.
*/
/* Validate width and height */
if (width <= 0 || height <= 0)
return NULL;
/* Compressed texture images not supported */
if (gl_compressed == GL_TRUE)
return NULL;
/* Create new texture */
tex_rect = _cogl_texture_rectangle_create_base (width, height, format);
/* Setup bitmap info */
tex_rect->is_foreign = TRUE;
tex_rect->format = format;
tex_rect->gl_texture = gl_handle;
tex_rect->gl_format = gl_int_format;
/* Unknown filter */
tex_rect->min_filter = GL_FALSE;
tex_rect->mag_filter = GL_FALSE;
return _cogl_texture_rectangle_handle_new (tex_rect);
}
static int
_cogl_texture_rectangle_get_max_waste (CoglTexture *tex)
{
return -1;
}
static gboolean
_cogl_texture_rectangle_is_sliced (CoglTexture *tex)
{
return FALSE;
}
static gboolean
_cogl_texture_rectangle_can_hardware_repeat (CoglTexture *tex)
{
return FALSE;
}
static void
_cogl_texture_rectangle_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
*s *= tex_rect->width;
*t *= tex_rect->height;
}
static CoglTransformResult
_cogl_texture_rectangle_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
gboolean need_repeat = FALSE;
int i;
for (i = 0; i < 4; i++)
{
if (coords[i] < 0.0f || coords[i] > 1.0f)
need_repeat = TRUE;
coords[i] *= (i & 1) ? tex_rect->height : tex_rect->width;
}
return (need_repeat ? COGL_TRANSFORM_SOFTWARE_REPEAT
: COGL_TRANSFORM_NO_REPEAT);
}
static gboolean
_cogl_texture_rectangle_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
if (out_gl_handle)
*out_gl_handle = tex_rect->gl_texture;
if (out_gl_target)
*out_gl_target = GL_TEXTURE_RECTANGLE_ARB;
return TRUE;
}
static void
_cogl_texture_rectangle_set_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
if (min_filter == tex_rect->min_filter
&& mag_filter == tex_rect->mag_filter)
return;
/* Rectangle textures don't support mipmapping */
g_assert (min_filter == GL_LINEAR || min_filter == GL_NEAREST);
/* Store new values */
tex_rect->min_filter = min_filter;
tex_rect->mag_filter = mag_filter;
/* Apply new filters to the texture */
_cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
tex_rect->is_foreign);
GE( ctx, glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER,
mag_filter) );
GE( ctx, glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER,
min_filter) );
}
static void
_cogl_texture_rectangle_pre_paint (CoglTexture *tex,
CoglTexturePrePaintFlags flags)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Rectangle textures don't support mipmaps */
g_assert ((flags & COGL_TEXTURE_NEEDS_MIPMAP) == 0);
}
static void
_cogl_texture_rectangle_ensure_non_quad_rendering (CoglTexture *tex)
{
/* Nothing needs to be done */
}
static gboolean
_cogl_texture_rectangle_set_region (CoglTexture *tex,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bmp)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
GLenum gl_format;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, FALSE);
bmp = _cogl_texture_prepare_for_upload (bmp,
cogl_texture_get_format (tex),
NULL,
NULL,
&gl_format,
&gl_type);
/* Send data to GL */
ctx->texture_driver->upload_subregion_to_gl (ctx,
GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
bmp,
gl_format,
gl_type);
cogl_object_unref (bmp);
return TRUE;
}
static gboolean
_cogl_texture_rectangle_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
int bpp;
GLenum gl_format;
GLenum gl_type;
_COGL_GET_CONTEXT (ctx, FALSE);
bpp = _cogl_pixel_format_get_bytes_per_pixel (format);
ctx->driver_vtable->pixel_format_to_gl (ctx,
format,
NULL, /* internal format */
&gl_format,
&gl_type);
ctx->texture_driver->prep_gl_for_pixels_download (ctx,
rowstride,
tex_rect->width,
bpp);
_cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
tex_rect->is_foreign);
return ctx->texture_driver->gl_get_tex_image (ctx,
GL_TEXTURE_RECTANGLE_ARB,
gl_format,
gl_type,
data);
}
static CoglPixelFormat
_cogl_texture_rectangle_get_format (CoglTexture *tex)
{
return COGL_TEXTURE_RECTANGLE (tex)->format;
}
static GLenum
_cogl_texture_rectangle_get_gl_format (CoglTexture *tex)
{
return COGL_TEXTURE_RECTANGLE (tex)->gl_format;
}
static int
_cogl_texture_rectangle_get_width (CoglTexture *tex)
{
return COGL_TEXTURE_RECTANGLE (tex)->width;
}
static int
_cogl_texture_rectangle_get_height (CoglTexture *tex)
{
return COGL_TEXTURE_RECTANGLE (tex)->height;
}
static gboolean
_cogl_texture_rectangle_is_foreign (CoglTexture *tex)
{
return COGL_TEXTURE_RECTANGLE (tex)->is_foreign;
}
static CoglTextureType
_cogl_texture_rectangle_get_type (CoglTexture *tex)
{
return COGL_TEXTURE_TYPE_RECTANGLE;
}
static const CoglTextureVtable
cogl_texture_rectangle_vtable =
{
TRUE, /* primitive */
_cogl_texture_rectangle_set_region,
_cogl_texture_rectangle_get_data,
NULL, /* foreach_sub_texture_in_region */
_cogl_texture_rectangle_get_max_waste,
_cogl_texture_rectangle_is_sliced,
_cogl_texture_rectangle_can_hardware_repeat,
_cogl_texture_rectangle_transform_coords_to_gl,
_cogl_texture_rectangle_transform_quad_coords_to_gl,
_cogl_texture_rectangle_get_gl_texture,
_cogl_texture_rectangle_set_filters,
_cogl_texture_rectangle_pre_paint,
_cogl_texture_rectangle_ensure_non_quad_rendering,
_cogl_texture_rectangle_set_wrap_mode_parameters,
_cogl_texture_rectangle_get_format,
_cogl_texture_rectangle_get_gl_format,
_cogl_texture_rectangle_get_width,
_cogl_texture_rectangle_get_height,
_cogl_texture_rectangle_get_type,
_cogl_texture_rectangle_is_foreign,
_cogl_texture_rectangle_set_auto_mipmap
};
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