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cogl: Add an internal CoglTextureRectangle backend

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This adds an internal rectangle texture backend which is mostly based
on the CoglTexture2D backend. It will throw assert failures if any
operations are attempted that rectangle textures don't support, such
as mipmapping or hardware repeating.
This commit is contained in:
Neil Roberts 2010-06-10 15:33:34 +01:00
parent 82e63a4753
commit 9a1aa08fda
5 changed files with 764 additions and 18 deletions
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2
cogl/Makefile.am
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@ -128,6 +128,8 @@ cogl_sources_c = \
$(srcdir)/cogl-texture.c \
$(srcdir)/cogl-texture-2d.c \
$(srcdir)/cogl-texture-2d-sliced.c \
$(srcdir)/cogl-texture-rectangle-private.h \
$(srcdir)/cogl-texture-rectangle.c \
$(srcdir)/cogl-atlas.h \
$(srcdir)/cogl-atlas.c \
$(srcdir)/cogl-atlas-texture-private.h \

68
cogl/cogl-texture-rectangle-private.h Normal file
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@ -0,0 +1,68 @@
/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 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/>.
*
*
*/
#ifndef __COGL_TEXTURE_RECTANGLE_H
#define __COGL_TEXTURE_RECTANGLE_H
#include "cogl-handle.h"
#include "cogl-material-private.h"
#include "cogl-texture-private.h"
#define COGL_TEXTURE_RECTANGLE(tex) ((CoglTextureRectangle *) tex)
typedef struct _CoglTextureRectangle CoglTextureRectangle;
struct _CoglTextureRectangle
{
CoglTexture _parent;
/* The internal format of the GL texture represented as a
CoglPixelFormat */
CoglPixelFormat format;
/* The internal format of the GL texture represented as a GL enum */
GLenum gl_format;
/* The texture object number */
GLuint gl_texture;
int width;
int height;
GLenum min_filter;
GLenum mag_filter;
GLint wrap_mode_s;
GLint wrap_mode_t;
};
GQuark
_cogl_handle_texture_rectangle_get_type (void);
CoglHandle
_cogl_texture_rectangle_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format);
CoglHandle
_cogl_texture_rectangle_new_from_bitmap (CoglHandle bmp_handle,
CoglTextureFlags flags,
CoglPixelFormat internal_format);
#endif /* __COGL_TEXTURE_RECTANGLE_H */

662
cogl/cogl-texture-rectangle.c Normal file
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@ -0,0 +1,662 @@
/*
* 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.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-texture-private.h"
#include "cogl-texture-rectangle-private.h"
#include "cogl-texture-driver.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-journal-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;
typedef struct _CoglTextureRectangleManualRepeatData
{
CoglTextureRectangle *tex_rect;
CoglTextureSliceCallback callback;
void *user_data;
} CoglTextureRectangleManualRepeatData;
static void
_cogl_texture_rectangle_wrap_coords (float t_1, float t_2,
float *out_t_1, float *out_t_2)
{
float int_part;
/* Wrap t_1 and t_2 to the range [0,1] */
modff (t_1 < t_2 ? t_1 : t_2, &int_part);
t_1 -= int_part;
t_2 -= int_part;
if (cogl_util_float_signbit (int_part))
{
*out_t_1 = 1.0f + t_1;
*out_t_2 = 1.0f + t_2;
}
else
{
*out_t_1 = t_1;
*out_t_2 = t_2;
}
}
static void
_cogl_texture_rectangle_manual_repeat_cb (const float *coords,
void *user_data)
{
CoglTextureRectangleManualRepeatData *data = user_data;
float slice_coords[4];
_cogl_texture_rectangle_wrap_coords (coords[0], coords[2],
slice_coords + 0, slice_coords + 2);
_cogl_texture_rectangle_wrap_coords (coords[1], coords[3],
slice_coords + 1, slice_coords + 3);
slice_coords[0] *= data->tex_rect->width;
slice_coords[1] *= data->tex_rect->height;
slice_coords[2] *= data->tex_rect->width;
slice_coords[3] *= data->tex_rect->height;
data->callback (COGL_TEXTURE (data->tex_rect),
data->tex_rect->gl_texture,
GL_TEXTURE_RECTANGLE_ARB,
slice_coords,
coords,
data->user_data);
}
static void
_cogl_texture_rectangle_foreach_sub_texture_in_region (
CoglTexture *tex,
float virtual_tx_1,
float virtual_ty_1,
float virtual_tx_2,
float virtual_ty_2,
CoglTextureSliceCallback callback,
void *user_data)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
CoglTextureRectangleManualRepeatData data;
data.tex_rect = tex_rect;
data.callback = callback;
data.user_data = user_data;
/* We need to implement manual repeating because if Cogl is calling
this function then it will set the wrap mode to GL_CLAMP_TO_EDGE
and hardware repeating can't be done */
_cogl_texture_iterate_manual_repeats
(_cogl_texture_rectangle_manual_repeat_cb,
virtual_tx_1, virtual_ty_1, virtual_tx_2, virtual_ty_2,
&data);
}
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_r)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
/* 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));
GE( _cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE) );
GE( glTexParameteri (GL_TEXTURE_RECTANGLE_ARB,
GL_TEXTURE_WRAP_S, wrap_mode_s) );
GE( 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)
{
_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)
{
GLenum gl_intformat;
GLenum gl_type;
if (!cogl_features_available (COGL_FEATURE_TEXTURE_RECTANGLE))
return FALSE;
_cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
NULL,
&gl_type);
/* Check that the driver can create a texture with that size */
if (!_cogl_texture_driver_size_supported (GL_TEXTURE_RECTANGLE_ARB,
gl_intformat,
gl_type,
width,
height))
return FALSE;
return TRUE;
}
static CoglTextureRectangle *
_cogl_texture_rectangle_create_base (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTextureRectangle *tex_rect = g_new (CoglTextureRectangle, 1);
CoglTexture *tex = COGL_TEXTURE (tex_rect);
tex->vtable = &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;
}
CoglHandle
_cogl_texture_rectangle_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
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))
return COGL_INVALID_HANDLE;
internal_format = _cogl_pixel_format_to_gl (internal_format,
&gl_intformat,
&gl_format,
&gl_type);
tex_rect = _cogl_texture_rectangle_create_base (width, height, flags,
internal_format);
_cogl_texture_driver_gen (GL_TEXTURE_RECTANGLE_ARB, 1, &tex_rect->gl_texture);
GE( _cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE) );
GE( glTexImage2D (GL_TEXTURE_RECTANGLE_ARB, 0, gl_intformat,
width, height, 0, gl_format, gl_type, NULL) );
return _cogl_texture_rectangle_handle_new (tex_rect);
}
CoglHandle
_cogl_texture_rectangle_new_from_bitmap (CoglHandle bmp_handle,
CoglTextureFlags flags,
CoglPixelFormat internal_format)
{
CoglTextureRectangle *tex_rect;
CoglBitmap *bmp = (CoglBitmap *)bmp_handle;
CoglBitmap dst_bmp;
gboolean dst_bmp_owner;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
g_return_val_if_fail (bmp_handle != COGL_INVALID_HANDLE, COGL_INVALID_HANDLE);
internal_format = _cogl_texture_determine_internal_format (bmp->format,
internal_format);
if (!_cogl_texture_rectangle_can_create (bmp->width, bmp->height,
internal_format))
return COGL_INVALID_HANDLE;
if (!_cogl_texture_prepare_for_upload (bmp,
internal_format,
&internal_format,
&dst_bmp,
&dst_bmp_owner,
&gl_intformat,
&gl_format,
&gl_type))
return COGL_INVALID_HANDLE;
tex_rect = _cogl_texture_rectangle_create_base (bmp->width,
bmp->height,
flags,
internal_format);
_cogl_texture_driver_gen (GL_TEXTURE_RECTANGLE_ARB, 1, &tex_rect->gl_texture);
_cogl_texture_driver_upload_to_gl (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE,
&dst_bmp,
gl_intformat,
gl_format,
gl_type);
tex_rect->gl_format = gl_intformat;
if (dst_bmp_owner)
g_free (dst_bmp.data);
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);
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 */
GE( _cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE) );
GE( glTexParameteri (GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER,
mag_filter) );
GE( 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,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const guint8 *data)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
int bpp;
CoglBitmap source_bmp;
CoglBitmap tmp_bmp;
gboolean tmp_bmp_owner = FALSE;
GLenum closest_gl_format;
GLenum closest_gl_type;
/* Check for valid format */
if (format == COGL_PIXEL_FORMAT_ANY)
return FALSE;
/* Shortcut out early if the image is empty */
if (width == 0 || height == 0)
return TRUE;
/* Init source bitmap */
source_bmp.width = width;
source_bmp.height = height;
source_bmp.format = format;
source_bmp.data = (guint8 *)data;
/* Rowstride from width if none specified */
bpp = _cogl_get_format_bpp (format);
source_bmp.rowstride = (rowstride == 0) ? width * bpp : rowstride;
/* Prepare the bitmap so that it will do the premultiplication
conversion */
_cogl_texture_prepare_for_upload (&source_bmp,
tex_rect->format,
NULL,
&tmp_bmp,
&tmp_bmp_owner,
NULL,
&closest_gl_format,
&closest_gl_type);
/* Send data to GL */
_cogl_texture_driver_upload_subregion_to_gl (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE,
src_x, src_y,
dst_x, dst_y,
dst_width, dst_height,
&tmp_bmp,
closest_gl_format,
closest_gl_type);
/* Free data if owner */
if (tmp_bmp_owner)
g_free (tmp_bmp.data);
return TRUE;
}
static int
_cogl_texture_rectangle_get_data (CoglTexture *tex,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data)
{
CoglTextureRectangle *tex_rect = COGL_TEXTURE_RECTANGLE (tex);
int bpp;
int byte_size;
CoglPixelFormat closest_format;
int closest_bpp;
GLenum closest_gl_format;
GLenum closest_gl_type;
CoglBitmap target_bmp;
CoglBitmap new_bmp;
gboolean success;
guint8 *src;
guint8 *dst;
int y;
/* Default to internal format if none specified */
if (format == COGL_PIXEL_FORMAT_ANY)
format = tex_rect->format;
/* Rowstride from texture width if none specified */
bpp = _cogl_get_format_bpp (format);
if (rowstride == 0)
rowstride = tex_rect->width * bpp;
/* Return byte size if only that requested */
byte_size = tex_rect->height * rowstride;
if (data == NULL)
return byte_size;
closest_format =
_cogl_texture_driver_find_best_gl_get_data_format (format,
&closest_gl_format,
&closest_gl_type);
closest_bpp = _cogl_get_format_bpp (closest_format);
target_bmp.width = tex_rect->width;
target_bmp.height = tex_rect->height;
/* Is the requested format supported? */
if (closest_format == format)
{
/* Target user data directly */
target_bmp.format = format;
target_bmp.rowstride = rowstride;
target_bmp.data = data;
}
else
{
/* Target intermediate buffer */
target_bmp.format = closest_format;
target_bmp.rowstride = target_bmp.width * closest_bpp;
target_bmp.data = g_malloc (target_bmp.height * target_bmp.rowstride);
}
_cogl_texture_driver_prep_gl_for_pixels_download (target_bmp.rowstride,
closest_bpp);
GE( _cogl_bind_gl_texture_transient (GL_TEXTURE_RECTANGLE_ARB,
tex_rect->gl_texture,
FALSE) );
if (!_cogl_texture_driver_gl_get_tex_image (GL_TEXTURE_RECTANGLE_ARB,
closest_gl_format,
closest_gl_type,
target_bmp.data))
{
/* XXX: In some cases _cogl_texture_rectangle_download_from_gl may
* fail to read back the texture data; such as for GLES which doesn't
* support glGetTexImage, so here we fallback to drawing the texture
* and reading the pixels from the framebuffer. */
_cogl_texture_draw_and_read (tex, &target_bmp,
closest_gl_format,
closest_gl_type);
}
/* Was intermediate used? */
if (closest_format != format)
{
/* Convert to requested format */
success = _cogl_bitmap_convert_format_and_premult (&target_bmp,
&new_bmp,
format);
/* Free intermediate data and return if failed */
g_free (target_bmp.data);
if (!success)
return 0;
/* Copy to user buffer */
for (y = 0; y < new_bmp.height; ++y)
{
src = new_bmp.data + y * new_bmp.rowstride;
dst = data + y * rowstride;
memcpy (dst, src, new_bmp.width);
}
/* Free converted data */
g_free (new_bmp.data);
}
return byte_size;
}
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 const CoglTextureVtable
cogl_texture_rectangle_vtable =
{
_cogl_texture_rectangle_set_region,
_cogl_texture_rectangle_get_data,
_cogl_texture_rectangle_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,
NULL /* is_foreign */
};

7
cogl/driver/gl/cogl-feature-functions.h
View file

@ -312,6 +312,13 @@ COGL_FEATURE_FUNCTION (void, glDeleteBuffers,
const GLuint *buffers))
COGL_FEATURE_END ()
COGL_FEATURE_BEGIN (texture_rectangle, 255, 255,
"ARB\0",
"texture_rectangle\0",
COGL_FEATURE_TEXTURE_RECTANGLE,
0)
COGL_FEATURE_END ()
/* Cogl requires OpenGL 1.2 so we assume these functions are always
available and don't bother setting any feature flags. We still have
to fetch the function pointers though because under Windows you can

43
cogl/driver/gl/cogl-texture-driver.c
View file

@ -70,6 +70,11 @@ _cogl_texture_driver_gen (GLenum gl_target,
GE( glTexParameteri (GL_TEXTURE_2D, 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();
}
@ -201,26 +206,28 @@ _cogl_texture_driver_size_supported (GLenum gl_target,
int width,
int height)
{
if (gl_target == GL_TEXTURE_2D)
{
/* Proxy texture allows for a quick check for supported size */
GLenum proxy_target;
GLint new_width = 0;
GLint new_width = 0;
GE( glTexImage2D (GL_PROXY_TEXTURE_2D, 0, GL_RGBA,
width, height, 0 /* border */,
gl_format, gl_type, NULL) );
GE( glGetTexLevelParameteriv (GL_PROXY_TEXTURE_2D, 0,
GL_TEXTURE_WIDTH, &new_width) );
return 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
{
/* not used */
return 0;
}
/* Unknown target, assume it's not supported */
return FALSE;
/* Proxy texture allows for a quick check for supported size */
GE( glTexImage2D (proxy_target, 0, GL_RGBA,
width, height, 0 /* border */,
gl_format, gl_type, NULL) );
GE( glGetTexLevelParameteriv (proxy_target, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
void