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/* cairo - a vector graphics library with display and print output
*
* Copyright © 2010 Linaro Limited
*
* This library is free software; you can redistribute it and/or
* modify it either under the terms of the GNU Lesser General Public
* License version 2.1 as published by the Free Software Foundation
* (the "LGPL") or, at your option, under the terms of the Mozilla
* Public License Version 1.1 (the "MPL"). If you do not alter this
* notice, a recipient may use your version of this file under either
* the MPL or the LGPL.
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING-LGPL-2.1; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
* You should have received a copy of the MPL along with this library
* in the file COPYING-MPL-1.1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.1 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
* OF ANY KIND, either express or implied. See the LGPL or the MPL for
* the specific language governing rights and limitations.
*
* Contributor(s):
* Alexandros Frantzis <alexandros.frantzis@linaro.org>
*/
#include "cairoint.h"
#include "cairo-gl-private.h"
#include "cairo-gl-dispatch-private.h"
#if CAIRO_HAS_DLSYM
#include <dlfcn.h>
#endif
#if CAIRO_HAS_DLSYM
static void *
_cairo_gl_dispatch_open_lib (void)
{
return dlopen (NULL, RTLD_LAZY);
}
static void
_cairo_gl_dispatch_close_lib (void *handle)
{
dlclose (handle);
}
static cairo_gl_generic_func_t
_cairo_gl_dispatch_get_proc_addr (void *handle, const char *name)
{
return (cairo_gl_generic_func_t) dlsym (handle, name);
}
#else
static void *
_cairo_gl_dispatch_open_lib (void)
{
return NULL;
}
static void
_cairo_gl_dispatch_close_lib (void *handle)
{
return;
}
static cairo_gl_generic_func_t
_cairo_gl_dispatch_get_proc_addr (void *handle, const char *name)
{
return NULL;
}
#endif /* CAIRO_HAS_DLSYM */
static void
_cairo_gl_dispatch_init_entries (cairo_gl_dispatch_t *dispatch,
cairo_gl_get_proc_addr_func_t get_proc_addr,
cairo_gl_dispatch_entry_t *entries,
cairo_gl_dispatch_name_t dispatch_name)
{
cairo_gl_dispatch_entry_t *entry = entries;
void *handle = _cairo_gl_dispatch_open_lib ();
while (entry->name[CAIRO_GL_DISPATCH_NAME_CORE] != NULL) {
void *dispatch_ptr = &((char *) dispatch)[entry->offset];
const char *name = entry->name[dispatch_name];
/*
* In strictly conforming EGL implementations, eglGetProcAddress() can
* be used only to get extension functions, but some of the functions
* we want belong to core GL(ES). If the *GetProcAddress function
* provided by the context fails, try to get the address of the wanted
* GL function using standard system facilities (eg dlsym() in *nix
* systems).
*/
cairo_gl_generic_func_t func = get_proc_addr (name);
if (func == NULL)
func = _cairo_gl_dispatch_get_proc_addr (handle, name);
*((cairo_gl_generic_func_t *) dispatch_ptr) = func;
++entry;
}
_cairo_gl_dispatch_close_lib (handle);
}
static cairo_status_t
_cairo_gl_dispatch_init_buffers (cairo_gl_dispatch_t *dispatch,
cairo_gl_get_proc_addr_func_t get_proc_addr,
int gl_version, cairo_gl_flavor_t gl_flavor)
{
cairo_gl_dispatch_name_t dispatch_name;
if (gl_flavor == CAIRO_GL_FLAVOR_DESKTOP)
{
if (gl_version >= CAIRO_GL_VERSION_ENCODE (1, 5))
dispatch_name = CAIRO_GL_DISPATCH_NAME_CORE;
else if (_cairo_gl_has_extension ("GL_ARB_vertex_buffer_object"))
dispatch_name = CAIRO_GL_DISPATCH_NAME_EXT;
else
return CAIRO_STATUS_DEVICE_ERROR;
}
else if (gl_flavor == CAIRO_GL_FLAVOR_ES &&
gl_version >= CAIRO_GL_VERSION_ENCODE (2, 0))
{
dispatch_name = CAIRO_GL_DISPATCH_NAME_ES;
}
else
{
return CAIRO_STATUS_DEVICE_ERROR;
}
_cairo_gl_dispatch_init_entries (dispatch, get_proc_addr,
dispatch_buffers_entries, dispatch_name);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_dispatch_init_shaders (cairo_gl_dispatch_t *dispatch,
cairo_gl_get_proc_addr_func_t get_proc_addr,
int gl_version, cairo_gl_flavor_t gl_flavor)
{
cairo_gl_dispatch_name_t dispatch_name;
if (gl_flavor == CAIRO_GL_FLAVOR_DESKTOP)
{
if (gl_version >= CAIRO_GL_VERSION_ENCODE (2, 0))
dispatch_name = CAIRO_GL_DISPATCH_NAME_CORE;
else if (_cairo_gl_has_extension ("GL_ARB_shader_objects"))
dispatch_name = CAIRO_GL_DISPATCH_NAME_EXT;
else
return CAIRO_STATUS_DEVICE_ERROR;
}
else if (gl_flavor == CAIRO_GL_FLAVOR_ES &&
gl_version >= CAIRO_GL_VERSION_ENCODE (2, 0))
{
dispatch_name = CAIRO_GL_DISPATCH_NAME_ES;
}
else
{
return CAIRO_STATUS_DEVICE_ERROR;
}
_cairo_gl_dispatch_init_entries (dispatch, get_proc_addr,
dispatch_shaders_entries, dispatch_name);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_dispatch_init_fbo (cairo_gl_dispatch_t *dispatch,
cairo_gl_get_proc_addr_func_t get_proc_addr,
int gl_version, cairo_gl_flavor_t gl_flavor)
{
cairo_gl_dispatch_name_t dispatch_name;
if (gl_flavor == CAIRO_GL_FLAVOR_DESKTOP)
{
if (gl_version >= CAIRO_GL_VERSION_ENCODE (3, 0) ||
_cairo_gl_has_extension ("GL_ARB_framebuffer_object"))
dispatch_name = CAIRO_GL_DISPATCH_NAME_CORE;
else if (_cairo_gl_has_extension ("GL_EXT_framebuffer_object"))
dispatch_name = CAIRO_GL_DISPATCH_NAME_EXT;
else
return CAIRO_STATUS_DEVICE_ERROR;
}
else if (gl_flavor == CAIRO_GL_FLAVOR_ES &&
gl_version >= CAIRO_GL_VERSION_ENCODE (2, 0))
{
dispatch_name = CAIRO_GL_DISPATCH_NAME_ES;
}
else
{
return CAIRO_STATUS_DEVICE_ERROR;
}
_cairo_gl_dispatch_init_entries (dispatch, get_proc_addr,
dispatch_fbo_entries, dispatch_name);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_gl_dispatch_init_multisampling (cairo_gl_dispatch_t *dispatch,
cairo_gl_get_proc_addr_func_t get_proc_addr,
int gl_version,
cairo_gl_flavor_t gl_flavor)
{
/* For the multisampling table, there are two GLES versions of the
* extension, so we put one in the EXT slot and one in the real ES slot.*/
cairo_gl_dispatch_name_t dispatch_name = CAIRO_GL_DISPATCH_NAME_CORE;
if (gl_flavor == CAIRO_GL_FLAVOR_ES) {
if (_cairo_gl_has_extension ("GL_EXT_multisampled_render_to_texture"))
dispatch_name = CAIRO_GL_DISPATCH_NAME_EXT;
else if (_cairo_gl_has_extension ("GL_IMG_multisampled_render_to_texture"))
dispatch_name = CAIRO_GL_DISPATCH_NAME_ES;
}
_cairo_gl_dispatch_init_entries (dispatch, get_proc_addr,
dispatch_multisampling_entries,
dispatch_name);
return CAIRO_STATUS_SUCCESS;
}
cairo_status_t
_cairo_gl_dispatch_init (cairo_gl_dispatch_t *dispatch,
cairo_gl_get_proc_addr_func_t get_proc_addr)
{
cairo_status_t status;
int gl_version;
cairo_gl_flavor_t gl_flavor;
gl_version = _cairo_gl_get_version ();
gl_flavor = _cairo_gl_get_flavor ();
status = _cairo_gl_dispatch_init_buffers (dispatch, get_proc_addr,
gl_version, gl_flavor);
if (status != CAIRO_STATUS_SUCCESS)
return status;
status = _cairo_gl_dispatch_init_shaders (dispatch, get_proc_addr,
gl_version, gl_flavor);
if (status != CAIRO_STATUS_SUCCESS)
return status;
status = _cairo_gl_dispatch_init_fbo (dispatch, get_proc_addr,
gl_version, gl_flavor);
if (status != CAIRO_STATUS_SUCCESS)
return status;
status = _cairo_gl_dispatch_init_multisampling (dispatch, get_proc_addr,
gl_version, gl_flavor);
if (status != CAIRO_STATUS_SUCCESS)
return status;
return CAIRO_STATUS_SUCCESS;
}