mutter/cogl/driver/gles/cogl-feature-functions.h
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

112 lines
4.8 KiB
C

/*
* 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/>.
*
*
*/
/* This is included multiple times with different definitions for
these macros */
COGL_FEATURE_BEGIN (offscreen, 255, 255,
"OES\0",
"framebuffer_object\0",
COGL_FEATURE_OFFSCREEN,
0)
COGL_FEATURE_FUNCTION (void, glGenRenderbuffers,
(GLsizei n,
GLuint *renderbuffers))
COGL_FEATURE_FUNCTION (void, glDeleteRenderbuffers,
(GLsizei n,
const GLuint *renderbuffers))
COGL_FEATURE_FUNCTION (void, glBindRenderbuffer,
(GLenum target,
GLuint renderbuffer))
COGL_FEATURE_FUNCTION (void, glRenderbufferStorage,
(GLenum target,
GLenum internalformat,
GLsizei width,
GLsizei height))
COGL_FEATURE_FUNCTION (void, glGenFramebuffers,
(GLsizei n,
GLuint *framebuffers))
COGL_FEATURE_FUNCTION (void, glBindFramebuffer,
(GLenum target,
GLuint framebuffer))
COGL_FEATURE_FUNCTION (void, glFramebufferTexture2D,
(GLenum target,
GLenum attachment,
GLenum textarget,
GLuint texture,
GLint level))
COGL_FEATURE_FUNCTION (void, glFramebufferRenderbuffer,
(GLenum target,
GLenum attachment,
GLenum renderbuffertarget,
GLuint renderbuffer))
COGL_FEATURE_FUNCTION (GLenum, glCheckFramebufferStatus,
(GLenum target))
COGL_FEATURE_FUNCTION (void, glDeleteFramebuffers,
(GLsizei n,
const GLuint *framebuffers))
COGL_FEATURE_FUNCTION (void, glGenerateMipmap,
(GLenum target))
COGL_FEATURE_FUNCTION (void, glGetFramebufferAttachmentParameteriv,
(GLenum target,
GLenum attachment,
GLenum pname,
GLint *params))
COGL_FEATURE_END ()
COGL_FEATURE_BEGIN (element_index_uint, 255, 255,
"OES\0",
"element_index_uint\0",
COGL_FEATURE_UNSIGNED_INT_INDICES,
0)
COGL_FEATURE_END ()
COGL_FEATURE_BEGIN (texture_npot, 255, 255,
"OES\0",
"texture_npot\0",
COGL_FEATURE_TEXTURE_NPOT |
COGL_FEATURE_TEXTURE_NPOT_BASIC |
COGL_FEATURE_TEXTURE_NPOT_MIPMAP |
COGL_FEATURE_TEXTURE_NPOT_REPEAT,
0)
COGL_FEATURE_END ()
COGL_FEATURE_BEGIN (texture_3d, 1, 2,
"OES\0",
"texture_3D\0",
COGL_FEATURE_TEXTURE_3D,
0)
COGL_FEATURE_FUNCTION (void, glTexImage3D,
(GLenum target, GLint level,
GLint internalFormat,
GLsizei width, GLsizei height,
GLsizei depth, GLint border,
GLenum format, GLenum type,
const GLvoid *pixels))
COGL_FEATURE_FUNCTION (void, glTexSubImage3D,
(GLenum target, GLint level,
GLint xoffset, GLint yoffset, GLint zoffset,
GLsizei width, GLsizei height, GLsizei depth,
GLenum format, GLenum type, const GLvoid* pixels))
COGL_FEATURE_END ()