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Diffstat (limited to 'src/cairo-gl-dispatch.c')
| -rw-r--r-- | src/cairo-gl-dispatch.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/cairo-gl-dispatch.c b/src/cairo-gl-dispatch.c new file mode 100644 index 0000000..0f64731 --- /dev/null +++ b/src/cairo-gl-dispatch.c @@ -0,0 +1,145 @@ +/* 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" + +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_bool_t use_ext) +{ + cairo_gl_dispatch_entry_t *entry = entries; + + while (entry->name_core != NULL) { + void *dispatch_ptr = &((char *) dispatch)[entry->offset]; + const char *name = use_ext ? entry->name_ext : + entry->name_core; + + cairo_gl_generic_func_t func = get_proc_addr (name); + + *((cairo_gl_generic_func_t *) dispatch_ptr) = func; + + ++entry; + } + +} + +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_bool_t use_ext; + + if (gl_version >= CAIRO_GL_VERSION_ENCODE (1, 5)) + use_ext = 0; + else if (_cairo_gl_has_extension ("GL_ARB_vertex_buffer_object")) + use_ext = 1; + else + return CAIRO_STATUS_DEVICE_ERROR; + + _cairo_gl_dispatch_init_entries (dispatch, get_proc_addr, + dispatch_buffers_entries, use_ext); + + 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_bool_t use_ext; + + /* Note: shader support is not necessary at the moment */ + if (gl_version >= CAIRO_GL_VERSION_ENCODE (2, 0)) + use_ext = 0; + else if (_cairo_gl_has_extension ("GL_ARB_shader_objects")) + use_ext = 1; + else + return CAIRO_STATUS_SUCCESS; + + _cairo_gl_dispatch_init_entries (dispatch, get_proc_addr, + dispatch_shaders_entries, use_ext); + + 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_bool_t use_ext; + + if (gl_version >= CAIRO_GL_VERSION_ENCODE (3, 0) || + _cairo_gl_has_extension ("GL_ARB_framebuffer_object")) + use_ext = 0; + else if (_cairo_gl_has_extension ("GL_EXT_framebuffer_object")) + use_ext = 1; + else + return CAIRO_STATUS_DEVICE_ERROR; + + _cairo_gl_dispatch_init_entries (dispatch, get_proc_addr, + dispatch_fbo_entries, use_ext); + + 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; + + gl_version = _cairo_gl_get_version (); + + status = _cairo_gl_dispatch_init_buffers (dispatch, get_proc_addr, + gl_version); + if (status != CAIRO_STATUS_SUCCESS) + return status; + + status = _cairo_gl_dispatch_init_shaders (dispatch, get_proc_addr, + gl_version); + if (status != CAIRO_STATUS_SUCCESS) + return status; + + status = _cairo_gl_dispatch_init_fbo (dispatch, get_proc_addr, + gl_version); + if (status != CAIRO_STATUS_SUCCESS) + return status; + + return CAIRO_STATUS_SUCCESS; +} |