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mutter/cogl/driver/gl/cogl-texture-driver.c
Neil Roberts 5288f6d88d Add a Cogl texture 3D backend 
This adds a publicly exposed experimental API for a 3D texture
backend. There is a feature flag which can be checked for whether 3D
textures are supported. Although we require OpenGL 1.2 which has 3D
textures in core, GLES only provides them through an extension so the
feature can be used to detect that.

The textures can be created with one of two new API functions :-

cogl_texture_3d_new_with_size

 and

cogl_texture_3d_new_from_data

There is also internally a new_from_bitmap function. new_from_data is
implemented in terms of this function.

The two constructors are effectively the only way to upload data to a
3D texture. It does not work to call glTexImage2D with the
GL_TEXTURE_3D target so the virtual for cogl_texture_set_region does
nothing. It would be possible to make cogl_texture_get_data do
something sensible like returning all of the images as a single long
image but this is not currently implemented and instead the virtual
just always fails. We may want to add API specific to the 3D texture
backend to get and set a sub region of the texture.

All of those three functions can throw a GError. This will happen if
the GPU does not support 3D textures or it does not support NPOTs and
an NPOT size is requested. It will also fail if the FBO extension is
not supported and the COGL_TEXTURE_NO_AUTO_MIPMAP flag is not
given. This could be avoided by copying the code for the
GL_GENERATE_MIPMAP TexParameter fallback, but in the interests of
keeping the code simple this is not yet done.

This adds a couple of functions to cogl-texture-driver for uploading
3D data and querying the 3D proxy
texture. prep_gl_for_pixels_upload_full now also takes sets the
GL_UNPACK_IMAGE_HEIGHT parameter so that 3D textures can have padding
between the images. Whenever 3D texture is uploading, both the height
of the images and the height of all of the data is specified (either
explicitly or implicilty from the CoglBitmap) so that the image height
can be deduced by dividing by the depth.
2010-07-13 14:28:52 +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.h"
#include "cogl-internal.h"
#include "cogl-util.h"
#include "cogl-bitmap.h"
#include "cogl-bitmap-private.h"
#include "cogl-texture-private.h"
#include "cogl-material.h"
#include "cogl-context.h"
#include "cogl-handle.h"
#include "cogl-primitives.h"
#include "cogl-material-private.h"
#include <string.h>
#include <stdlib.h>
#include <math.h>
#define glGenerateMipmap ctx->drv.pf_glGenerateMipmap
#define glTexImage3D ctx->drv.pf_glTexImage3D
void
_cogl_texture_driver_gen (GLenum gl_target,
GLsizei n,
GLuint *textures)
{
unsigned int i;
GE (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( 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 (int pixels_rowstride,
int image_height,
int pixels_src_x,
int pixels_src_y,
int pixels_bpp)
{
GE( glPixelStorei (GL_UNPACK_ROW_LENGTH, pixels_rowstride / pixels_bpp) );
GE( glPixelStorei (GL_UNPACK_SKIP_PIXELS, pixels_src_x) );
GE( glPixelStorei (GL_UNPACK_SKIP_ROWS, pixels_src_y) );
if (cogl_features_available (COGL_FEATURE_TEXTURE_3D))
GE( glPixelStorei (GL_UNPACK_IMAGE_HEIGHT, image_height) );
_cogl_texture_prep_gl_alignment_for_pixels_upload (pixels_rowstride);
}
void
_cogl_texture_driver_prep_gl_for_pixels_upload (int pixels_rowstride,
int pixels_bpp)
{
prep_gl_for_pixels_upload_full (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 (int pixels_rowstride,
int image_height,
int pixels_src_x,
int pixels_src_y,
int pixels_bpp)
{
GE( glPixelStorei (GL_PACK_ROW_LENGTH, pixels_rowstride / pixels_bpp) );
GE( glPixelStorei (GL_PACK_SKIP_PIXELS, pixels_src_x) );
GE( glPixelStorei (GL_PACK_SKIP_ROWS, pixels_src_y) );
if (cogl_features_available (COGL_FEATURE_TEXTURE_3D))
GE( glPixelStorei (GL_PACK_IMAGE_HEIGHT, image_height) );
_cogl_texture_prep_gl_alignment_for_pixels_download (pixels_rowstride);
}
void
_cogl_texture_driver_prep_gl_for_pixels_download (int pixels_rowstride,
int pixels_bpp)
{
prep_gl_for_pixels_download_full (pixels_rowstride, 0, 0, 0, pixels_bpp);
}
void
_cogl_texture_driver_upload_subregion_to_gl (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)
{
int bpp = _cogl_get_format_bpp (source_bmp->format);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (source_bmp->rowstride,
0,
src_x,
src_y,
bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( glTexSubImage2D (gl_target, 0,
dst_x, dst_y,
width, height,
source_gl_format,
source_gl_type,
source_bmp->data) );
}
void
_cogl_texture_driver_upload_to_gl (GLenum gl_target,
GLuint gl_handle,
gboolean is_foreign,
CoglBitmap *source_bmp,
GLint internal_gl_format,
GLuint source_gl_format,
GLuint source_gl_type)
{
int bpp = _cogl_get_format_bpp (source_bmp->format);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (source_bmp->rowstride, 0, 0, 0, bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( glTexImage2D (gl_target, 0,
internal_gl_format,
source_bmp->width, source_bmp->height,
0,
source_gl_format,
source_gl_type,
source_bmp->data) );
}
void
_cogl_texture_driver_upload_to_gl_3d (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)
{
int bpp = _cogl_get_format_bpp (source_bmp->format);
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
/* Setup gl alignment to match rowstride and top-left corner */
prep_gl_for_pixels_upload_full (source_bmp->rowstride,
source_bmp->height / depth,
0, 0, bpp);
_cogl_bind_gl_texture_transient (gl_target, gl_handle, is_foreign);
GE( glTexImage3D (gl_target,
0, /* level */
internal_gl_format,
source_bmp->width,
height,
depth,
0,
source_gl_format,
source_gl_type,
source_bmp->data) );
}
gboolean
_cogl_texture_driver_gl_get_tex_image (GLenum gl_target,
GLenum dest_gl_format,
GLenum dest_gl_type,
guint8 *dest)
{
GE (glGetTexImage (gl_target,
0, /* level */
dest_gl_format,
dest_gl_type,
(GLvoid *)dest));
return TRUE;
}
gboolean
_cogl_texture_driver_size_supported_3d (GLenum gl_target,
GLenum gl_format,
GLenum gl_type,
int width,
int height,
int depth)
{
GLenum proxy_target;
GLint new_width = 0;
_COGL_GET_CONTEXT (ctx, FALSE);
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( glTexImage3D (proxy_target, 0, GL_RGBA,
width, height, depth, 0 /* border */,
gl_format, gl_type, NULL) );
GE( glGetTexLevelParameteriv (proxy_target, 0,
GL_TEXTURE_WIDTH, &new_width) );
return new_width != 0;
}
gboolean
_cogl_texture_driver_size_supported (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( 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
_cogl_texture_driver_try_setting_gl_border_color (
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( glTexParameterfv (gl_target, GL_TEXTURE_BORDER_COLOR,
transparent_color) );
}
gboolean
_cogl_pixel_format_from_gl_internal (GLenum gl_int_format,
CoglPixelFormat *out_format)
{
/* It doesn't really matter we convert to exact same
format (some have no cogl match anyway) since format
is re-matched against cogl when getting or setting
texture image data.
*/
switch (gl_int_format)
{
case GL_ALPHA: case GL_ALPHA4: case GL_ALPHA8:
case GL_ALPHA12: case GL_ALPHA16:
*out_format = COGL_PIXEL_FORMAT_A_8;
return TRUE;
case GL_LUMINANCE: case GL_LUMINANCE4: case GL_LUMINANCE8:
case GL_LUMINANCE12: case GL_LUMINANCE16:
*out_format = COGL_PIXEL_FORMAT_G_8;
return TRUE;
case GL_RGB: case GL_RGB4: case GL_RGB5: case GL_RGB8:
case GL_RGB10: case GL_RGB12: case GL_RGB16: case GL_R3_G3_B2:
*out_format = COGL_PIXEL_FORMAT_RGB_888;
return TRUE;
case GL_RGBA: case GL_RGBA2: case GL_RGBA4: case GL_RGB5_A1:
case GL_RGBA8: case GL_RGB10_A2: case GL_RGBA12: case GL_RGBA16:
*out_format = COGL_PIXEL_FORMAT_RGBA_8888;
return TRUE;
}
return FALSE;
}
CoglPixelFormat
_cogl_pixel_format_to_gl (CoglPixelFormat format,
GLenum *out_glintformat,
GLenum *out_glformat,
GLenum *out_gltype)
{
CoglPixelFormat required_format;
GLenum glintformat = 0;
GLenum glformat = 0;
GLenum gltype = 0;
/* FIXME: check YUV support */
required_format = format;
/* Find GL equivalents */
switch (format & COGL_UNPREMULT_MASK)
{
case COGL_PIXEL_FORMAT_A_8:
glintformat = GL_ALPHA;
glformat = GL_ALPHA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_G_8:
glintformat = GL_LUMINANCE;
glformat = GL_LUMINANCE;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGB_888:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGR_888:
glintformat = GL_RGB;
glformat = GL_BGR;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_RGBA_8888:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_BYTE;
break;
case COGL_PIXEL_FORMAT_BGRA_8888:
glintformat = GL_RGBA;
glformat = GL_BGRA;
gltype = GL_UNSIGNED_BYTE;
break;
/* The following two types of channel ordering
* have no GL equivalent unless defined using
* system word byte ordering */
case COGL_PIXEL_FORMAT_ARGB_8888:
glintformat = GL_RGBA;
glformat = GL_BGRA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
#else
gltype = GL_UNSIGNED_INT_8_8_8_8_REV;
#endif
break;
case COGL_PIXEL_FORMAT_ABGR_8888:
glintformat = GL_RGBA;
glformat = GL_RGBA;
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
gltype = GL_UNSIGNED_INT_8_8_8_8;
#else
gltype = GL_UNSIGNED_INT_8_8_8_8_REV;
#endif
break;
/* The following three types of channel ordering
* are always defined using system word byte
* ordering (even according to GLES spec) */
case COGL_PIXEL_FORMAT_RGB_565:
glintformat = GL_RGB;
glformat = GL_RGB;
gltype = GL_UNSIGNED_SHORT_5_6_5;
break;
case COGL_PIXEL_FORMAT_RGBA_4444:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_4_4_4_4;
break;
case COGL_PIXEL_FORMAT_RGBA_5551:
glintformat = GL_RGBA;
glformat = GL_RGBA;
gltype = GL_UNSIGNED_SHORT_5_5_5_1;
break;
/* FIXME: check extensions for YUV support */
default:
break;
}
if (out_glintformat != NULL)
*out_glintformat = glintformat;
if (out_glformat != NULL)
*out_glformat = glformat;
if (out_gltype != NULL)
*out_gltype = gltype;
return required_format;
}
gboolean
_cogl_texture_driver_allows_foreign_gl_target (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;
}
void
_cogl_texture_driver_gl_generate_mipmaps (GLenum gl_target)
{
_COGL_GET_CONTEXT (ctx, NO_RETVAL);
GE( glGenerateMipmap (gl_target) );
}
CoglPixelFormat
_cogl_texture_driver_find_best_gl_get_data_format (
CoglPixelFormat format,
GLenum *closest_gl_format,
GLenum *closest_gl_type)
{
/* Find closest format that's supported by GL */
return _cogl_pixel_format_to_gl (format,
NULL, /* don't need */
closest_gl_format,
closest_gl_type);
}
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