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mutter/cogl/cogl-texture-3d.c
Neil Roberts ff11a2b207 Use GL_ARB_texture_swizzle to emulate GL_ALPHA textures 
The core profile of GL3 has removed support for component-alpha
textures. Previously the GL3 driver would just ignore this and try to
create them anyway. This would generate a GL error on Mesa.

To fix this the GL texture driver will now create a GL_RED texture
when GL_ALPHA textures are not supported natively. It will then set a
texture swizzle using the GL_ARB_texture_swizzle extension so that the
alpha component will be taken from the red component of the texture.
The swizzle is part of the texture object state so it only needs to be
set once when the texture is created.

The ‘gen’ virtual function of the texture driver has been changed to
also take the internal format as a parameter. The GL driver will now
set the swizzle as appropriate here.

The GL3 driver now reports an error if the texture swizzle extension
is not available because Cogl can't really work properly without out
it. The extension is part of GL 3.3 so it is quite likely that it has
wide support from drivers. Eventually we could get rid of this
requirement if we have our own GLSL front-end and we could generate
the swizzle ourselves.

When uploading or downloading texture data to or from a
component-alpha texture, we can no longer rely on GL to do the
conversion. The swizzle doesn't have any effect on the texture data
functions. In these cases Cogl will now force an intermediate buffer
to be used and it will manually do the conversion as it does for the
GLES drivers.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit 32bacf81ebaa3be21a8f26af07d8f6eed6607652)
2013-01-22 17:48:04 +00:00

643 lines
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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-3d-private.h"
#include "cogl-texture-3d.h"
#include "cogl-texture-driver.h"
#include "cogl-context-private.h"
#include "cogl-object-private.h"
#include "cogl-journal-private.h"
#include "cogl-pipeline-private.h"
#include "cogl-pipeline-opengl-private.h"
#include "cogl-error-private.h"
#include <string.h>
#include <math.h>
/* These might not be defined on GLES */
#ifndef GL_TEXTURE_3D
#define GL_TEXTURE_3D 0x806F
#endif
#ifndef GL_TEXTURE_WRAP_R
#define GL_TEXTURE_WRAP_R 0x8072
#endif
static void _cogl_texture_3d_free (CoglTexture3D *tex_3d);
COGL_TEXTURE_DEFINE (Texture3D, texture_3d);
static const CoglTextureVtable cogl_texture_3d_vtable;
static void
_cogl_texture_3d_gl_flush_legacy_texobj_wrap_modes (CoglTexture *tex,
GLenum wrap_mode_s,
GLenum wrap_mode_t,
GLenum wrap_mode_p)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
CoglContext *ctx = tex->context;
/* Only set the wrap mode if it's different from the current value
to avoid too many GL calls. */
if (tex_3d->gl_legacy_texobj_wrap_mode_s != wrap_mode_s ||
tex_3d->gl_legacy_texobj_wrap_mode_t != wrap_mode_t ||
tex_3d->gl_legacy_texobj_wrap_mode_p != wrap_mode_p)
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( ctx, glTexParameteri (GL_TEXTURE_3D,
GL_TEXTURE_WRAP_S,
wrap_mode_s) );
GE( ctx, glTexParameteri (GL_TEXTURE_3D,
GL_TEXTURE_WRAP_T,
wrap_mode_t) );
GE( ctx, glTexParameteri (GL_TEXTURE_3D,
GL_TEXTURE_WRAP_R,
wrap_mode_p) );
tex_3d->gl_legacy_texobj_wrap_mode_s = wrap_mode_s;
tex_3d->gl_legacy_texobj_wrap_mode_t = wrap_mode_t;
tex_3d->gl_legacy_texobj_wrap_mode_p = wrap_mode_p;
}
}
static void
_cogl_texture_3d_free (CoglTexture3D *tex_3d)
{
_cogl_delete_gl_texture (tex_3d->gl_texture);
/* Chain up */
_cogl_texture_free (COGL_TEXTURE (tex_3d));
}
static void
_cogl_texture_3d_set_auto_mipmap (CoglTexture *tex,
CoglBool value)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
tex_3d->auto_mipmap = value;
}
static CoglTexture3D *
_cogl_texture_3d_create_base (CoglContext *ctx,
int width,
int height,
int depth,
CoglPixelFormat internal_format)
{
CoglTexture3D *tex_3d = g_new (CoglTexture3D, 1);
CoglTexture *tex = COGL_TEXTURE (tex_3d);
_cogl_texture_init (tex, ctx, &cogl_texture_3d_vtable);
tex_3d->width = width;
tex_3d->height = height;
tex_3d->depth = depth;
tex_3d->mipmaps_dirty = TRUE;
tex_3d->auto_mipmap = TRUE;
/* We default to GL_LINEAR for both filters */
tex_3d->gl_legacy_texobj_min_filter = GL_LINEAR;
tex_3d->gl_legacy_texobj_mag_filter = GL_LINEAR;
/* Wrap mode not yet set */
tex_3d->gl_legacy_texobj_wrap_mode_s = GL_FALSE;
tex_3d->gl_legacy_texobj_wrap_mode_t = GL_FALSE;
tex_3d->gl_legacy_texobj_wrap_mode_p = GL_FALSE;
tex_3d->format = internal_format;
return tex_3d;
}
static CoglBool
_cogl_texture_3d_can_create (CoglContext *ctx,
int width,
int height,
int depth,
CoglPixelFormat internal_format,
CoglError **error)
{
GLenum gl_intformat;
GLenum gl_type;
/* This should only happen on GLES */
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_3D))
{
_cogl_set_error (error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_UNSUPPORTED,
"3D textures are not supported by the GPU");
return FALSE;
}
/* If NPOT textures aren't supported then the size must be a power
of two */
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_TEXTURE_NPOT) &&
(!_cogl_util_is_pot (width) ||
!_cogl_util_is_pot (height) ||
!_cogl_util_is_pot (depth)))
{
_cogl_set_error (error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_UNSUPPORTED,
"A non-power-of-two size was requested but this is not "
"supported by the GPU");
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_3d (ctx,
GL_TEXTURE_3D,
gl_intformat,
gl_type,
width,
height,
depth))
{
_cogl_set_error (error,
COGL_SYSTEM_ERROR,
COGL_SYSTEM_ERROR_UNSUPPORTED,
"The requested dimensions are not supported by the GPU");
return FALSE;
}
return TRUE;
}
CoglTexture3D *
cogl_texture_3d_new_with_size (CoglContext *ctx,
int width,
int height,
int depth,
CoglPixelFormat internal_format,
CoglError **error)
{
CoglTexture3D *tex_3d;
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_3d_can_create (ctx,
width, height, depth,
internal_format,
error))
return NULL;
internal_format = ctx->driver_vtable->pixel_format_to_gl (ctx,
internal_format,
&gl_intformat,
&gl_format,
&gl_type);
tex_3d = _cogl_texture_3d_create_base (ctx,
width, height, depth,
internal_format);
tex_3d->gl_texture =
ctx->texture_driver->gen (ctx, GL_TEXTURE_3D, internal_format);
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( ctx, glTexImage3D (GL_TEXTURE_3D, 0, gl_intformat,
width, height, depth, 0, gl_format, gl_type, NULL) );
return _cogl_texture_3d_object_new (tex_3d);
}
CoglTexture3D *
cogl_texture_3d_new_from_bitmap (CoglBitmap *bmp,
unsigned int height,
unsigned int depth,
CoglPixelFormat internal_format,
CoglError **error)
{
CoglTexture3D *tex_3d;
CoglBitmap *dst_bmp;
CoglPixelFormat bmp_format;
unsigned int bmp_width;
GLenum gl_intformat;
GLenum gl_format;
GLenum gl_type;
uint8_t *data;
CoglContext *ctx;
ctx = _cogl_bitmap_get_context (bmp);
bmp_width = cogl_bitmap_get_width (bmp);
bmp_format = cogl_bitmap_get_format (bmp);
internal_format = _cogl_texture_determine_internal_format (bmp_format,
internal_format);
if (!_cogl_texture_3d_can_create (ctx,
bmp_width, height, depth,
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)
{
_cogl_set_error (error, COGL_BITMAP_ERROR, COGL_BITMAP_ERROR_FAILED,
"Bitmap conversion failed");
return NULL;
}
tex_3d = _cogl_texture_3d_create_base (ctx,
bmp_width, height, depth,
internal_format);
/* Keep a copy of the first pixel so that if glGenerateMipmap isn't
supported we can fallback to using GL_GENERATE_MIPMAP */
if (!cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN) &&
(data = _cogl_bitmap_map (dst_bmp,
COGL_BUFFER_ACCESS_READ, 0)))
{
CoglPixelFormat format = cogl_bitmap_get_format (dst_bmp);
tex_3d->first_pixel.gl_format = gl_format;
tex_3d->first_pixel.gl_type = gl_type;
memcpy (tex_3d->first_pixel.data, data,
_cogl_pixel_format_get_bytes_per_pixel (format));
_cogl_bitmap_unmap (dst_bmp);
}
tex_3d->gl_texture =
ctx->texture_driver->gen (ctx, GL_TEXTURE_3D, internal_format);
ctx->texture_driver->upload_to_gl_3d (ctx,
GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE, /* is_foreign */
height,
depth,
dst_bmp,
gl_intformat,
gl_format,
gl_type);
tex_3d->gl_format = gl_intformat;
cogl_object_unref (dst_bmp);
return _cogl_texture_3d_object_new (tex_3d);
}
CoglTexture3D *
cogl_texture_3d_new_from_data (CoglContext *context,
int width,
int height,
int depth,
CoglPixelFormat format,
CoglPixelFormat internal_format,
int rowstride,
int image_stride,
const uint8_t *data,
CoglError **error)
{
CoglBitmap *bitmap;
CoglTexture3D *ret;
/* These are considered a programmer errors so we won't set a
CoglError. It would be nice if this was a _COGL_RETURN_IF_FAIL but the
rest of Cogl isn't using that */
if (format == COGL_PIXEL_FORMAT_ANY)
return NULL;
if (data == NULL)
return NULL;
/* Rowstride from width if not given */
if (rowstride == 0)
rowstride = width * _cogl_pixel_format_get_bytes_per_pixel (format);
/* Image stride from height and rowstride if not given */
if (image_stride == 0)
image_stride = height * rowstride;
if (image_stride < rowstride * height)
return NULL;
/* GL doesn't support uploading when the image_stride isn't a
multiple of the rowstride. If this happens we'll just pack the
image into a new bitmap. The documentation for this function
recommends avoiding this situation. */
if (image_stride % rowstride != 0)
{
uint8_t *bmp_data;
int bmp_rowstride;
int z, y;
bitmap = _cogl_bitmap_new_with_malloc_buffer (context,
width,
depth * height,
format);
bmp_data = _cogl_bitmap_map (bitmap,
COGL_BUFFER_ACCESS_WRITE,
COGL_BUFFER_MAP_HINT_DISCARD);
if (bmp_data == NULL)
{
cogl_object_unref (bitmap);
return NULL;
}
bmp_rowstride = cogl_bitmap_get_rowstride (bitmap);
/* Copy all of the images in */
for (z = 0; z < depth; z++)
for (y = 0; y < height; y++)
memcpy (bmp_data + (z * bmp_rowstride * height +
bmp_rowstride * y),
data + z * image_stride + rowstride * y,
bmp_rowstride);
_cogl_bitmap_unmap (bitmap);
}
else
bitmap = cogl_bitmap_new_for_data (context,
width,
image_stride / rowstride * depth,
format,
rowstride,
(uint8_t *) data);
ret = cogl_texture_3d_new_from_bitmap (bitmap,
height,
depth,
internal_format,
error);
cogl_object_unref (bitmap);
return ret;
}
static int
_cogl_texture_3d_get_max_waste (CoglTexture *tex)
{
return -1;
}
static CoglBool
_cogl_texture_3d_is_sliced (CoglTexture *tex)
{
return FALSE;
}
static CoglBool
_cogl_texture_3d_can_hardware_repeat (CoglTexture *tex)
{
return TRUE;
}
static void
_cogl_texture_3d_transform_coords_to_gl (CoglTexture *tex,
float *s,
float *t)
{
/* The texture coordinates map directly so we don't need to do
anything */
}
static CoglTransformResult
_cogl_texture_3d_transform_quad_coords_to_gl (CoglTexture *tex,
float *coords)
{
/* The texture coordinates map directly so we don't need to do
anything other than check for repeats */
CoglBool need_repeat = FALSE;
int i;
for (i = 0; i < 4; i++)
if (coords[i] < 0.0f || coords[i] > 1.0f)
need_repeat = TRUE;
return (need_repeat ? COGL_TRANSFORM_HARDWARE_REPEAT
: COGL_TRANSFORM_NO_REPEAT);
}
static CoglBool
_cogl_texture_3d_get_gl_texture (CoglTexture *tex,
GLuint *out_gl_handle,
GLenum *out_gl_target)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
if (out_gl_handle)
*out_gl_handle = tex_3d->gl_texture;
if (out_gl_target)
*out_gl_target = GL_TEXTURE_3D;
return TRUE;
}
static void
_cogl_texture_3d_gl_flush_legacy_texobj_filters (CoglTexture *tex,
GLenum min_filter,
GLenum mag_filter)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
CoglContext *ctx = tex->context;
if (min_filter == tex_3d->gl_legacy_texobj_min_filter
&& mag_filter == tex_3d->gl_legacy_texobj_mag_filter)
return;
/* Store new values */
tex_3d->gl_legacy_texobj_min_filter = min_filter;
tex_3d->gl_legacy_texobj_mag_filter = mag_filter;
/* Apply new filters to the texture */
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
GE( ctx, glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, mag_filter) );
GE( ctx, glTexParameteri (GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, min_filter) );
}
static void
_cogl_texture_3d_pre_paint (CoglTexture *tex, CoglTexturePrePaintFlags flags)
{
CoglTexture3D *tex_3d = COGL_TEXTURE_3D (tex);
CoglContext *ctx = tex->context;
/* Only update if the mipmaps are dirty */
if ((flags & COGL_TEXTURE_NEEDS_MIPMAP) &&
tex_3d->auto_mipmap && tex_3d->mipmaps_dirty)
{
_cogl_bind_gl_texture_transient (GL_TEXTURE_3D,
tex_3d->gl_texture,
FALSE);
/* glGenerateMipmap is defined in the FBO extension. If it's not
available we'll fallback to temporarily enabling
GL_GENERATE_MIPMAP and reuploading the first pixel */
if (cogl_has_feature (ctx, COGL_FEATURE_ID_OFFSCREEN))
ctx->texture_driver->gl_generate_mipmaps (ctx, GL_TEXTURE_3D);
#if defined (HAVE_COGL_GL) || defined (HAVE_COGL_GLES)
else if (ctx->driver != COGL_DRIVER_GLES2)
{
GE( ctx, glTexParameteri (GL_TEXTURE_3D,
GL_GENERATE_MIPMAP,
GL_TRUE) );
GE( ctx, glTexSubImage3D (GL_TEXTURE_3D,
0, /* level */
0, /* xoffset */
0, /* yoffset */
0, /* zoffset */
1, /* width */
1, /* height */
1, /* depth */
tex_3d->first_pixel.gl_format,
tex_3d->first_pixel.gl_type,
tex_3d->first_pixel.data) );
GE( ctx, glTexParameteri (GL_TEXTURE_3D,
GL_GENERATE_MIPMAP,
GL_FALSE) );
}
#endif
tex_3d->mipmaps_dirty = FALSE;
}
}
static void
_cogl_texture_3d_ensure_non_quad_rendering (CoglTexture *tex)
{
/* Nothing needs to be done */
}
static CoglBool
_cogl_texture_3d_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)
{
/* This function doesn't really make sense for 3D textures because
it can't specify which image to upload to */
return FALSE;
}
static int
_cogl_texture_3d_get_data (CoglTexture *tex,
CoglPixelFormat format,
int rowstride,
uint8_t *data)
{
/* FIXME: we could probably implement this by assuming the data is
big enough to hold all of the images and that there is no stride
between the images. However it would be better to have an API
that can provide an image stride and this function probably isn't
particularly useful anyway so for now it just reports failure */
return 0;
}
static CoglPixelFormat
_cogl_texture_3d_get_format (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->format;
}
static GLenum
_cogl_texture_3d_get_gl_format (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->gl_format;
}
static int
_cogl_texture_3d_get_width (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->width;
}
static int
_cogl_texture_3d_get_height (CoglTexture *tex)
{
return COGL_TEXTURE_3D (tex)->height;
}
static CoglTextureType
_cogl_texture_3d_get_type (CoglTexture *tex)
{
return COGL_TEXTURE_TYPE_3D;
}
static const CoglTextureVtable
cogl_texture_3d_vtable =
{
TRUE, /* primitive */
_cogl_texture_3d_set_region,
_cogl_texture_3d_get_data,
NULL, /* foreach_sub_texture_in_region */
_cogl_texture_3d_get_max_waste,
_cogl_texture_3d_is_sliced,
_cogl_texture_3d_can_hardware_repeat,
_cogl_texture_3d_transform_coords_to_gl,
_cogl_texture_3d_transform_quad_coords_to_gl,
_cogl_texture_3d_get_gl_texture,
_cogl_texture_3d_gl_flush_legacy_texobj_filters,
_cogl_texture_3d_pre_paint,
_cogl_texture_3d_ensure_non_quad_rendering,
_cogl_texture_3d_gl_flush_legacy_texobj_wrap_modes,
_cogl_texture_3d_get_format,
_cogl_texture_3d_get_gl_format,
_cogl_texture_3d_get_width,
_cogl_texture_3d_get_height,
_cogl_texture_3d_get_type,
NULL, /* is_foreign */
_cogl_texture_3d_set_auto_mipmap
};
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