From 530ffd0b7d3c39757b20f00716e486b5caf89aff Mon Sep 17 00:00:00 2001 From: sanine Date: Wed, 12 Oct 2022 12:03:23 -0500 Subject: add cairo --- libs/cairo-1.16.0/src/cairo-gl-info.c | 113 ++++++++++++++++++++++++++++++++++ 1 file changed, 113 insertions(+) create mode 100644 libs/cairo-1.16.0/src/cairo-gl-info.c (limited to 'libs/cairo-1.16.0/src/cairo-gl-info.c') diff --git a/libs/cairo-1.16.0/src/cairo-gl-info.c b/libs/cairo-1.16.0/src/cairo-gl-info.c new file mode 100644 index 0000000..26b7b45 --- /dev/null +++ b/libs/cairo-1.16.0/src/cairo-gl-info.c @@ -0,0 +1,113 @@ +/* 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 + */ + +#include "cairoint.h" +#include "cairo-gl-private.h" + +#include + +int +_cairo_gl_get_version (void) +{ + int major, minor; + const char *version = (const char *) glGetString (GL_VERSION); + const char *dot = version == NULL ? NULL : strchr (version, '.'); + const char *major_start = dot; + + /* Sanity check */ + if (dot == NULL || dot == version || *(dot + 1) == '\0') { + major = 0; + minor = 0; + } else { + /* Find the start of the major version in the string */ + while (major_start > version && *major_start != ' ') + --major_start; + major = strtol (major_start, NULL, 10); + minor = strtol (dot + 1, NULL, 10); + } + + return CAIRO_GL_VERSION_ENCODE (major, minor); +} + +cairo_gl_flavor_t +_cairo_gl_get_flavor (void) +{ + const char *version = (const char *) glGetString (GL_VERSION); + cairo_gl_flavor_t flavor; + + if (version == NULL) + flavor = CAIRO_GL_FLAVOR_NONE; + else if (strstr (version, "OpenGL ES 3") != NULL) + flavor = CAIRO_GL_FLAVOR_ES3; + else if (strstr (version, "OpenGL ES 2") != NULL) + flavor = CAIRO_GL_FLAVOR_ES2; + else + flavor = CAIRO_GL_FLAVOR_DESKTOP; + + return flavor; +} + +unsigned long +_cairo_gl_get_vbo_size (void) +{ + unsigned long vbo_size; + + const char *env = getenv ("CAIRO_GL_VBO_SIZE"); + if (env == NULL) { + vbo_size = CAIRO_GL_VBO_SIZE_DEFAULT; + } else { + errno = 0; + vbo_size = strtol (env, NULL, 10); + assert (errno == 0); + assert (vbo_size > 0); + } + + return vbo_size; +} + +cairo_bool_t +_cairo_gl_has_extension (const char *ext) +{ + const char *extensions = (const char *) glGetString (GL_EXTENSIONS); + size_t len = strlen (ext); + const char *ext_ptr = extensions; + + if (unlikely (ext_ptr == NULL)) + return 0; + + while ((ext_ptr = strstr (ext_ptr, ext)) != NULL) { + if (ext_ptr[len] == ' ' || ext_ptr[len] == '\0') + break; + ext_ptr += len; + } + + return (ext_ptr != NULL); +} -- cgit v1.2.1