summaryrefslogtreecommitdiff
path: root/src/cairo-gl-info.c
blob: 53ba3d20b66d6c4993e4556070764fb37b85925a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/* 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 <errno.h>
int _cairo_glsl_get_version (cairo_gl_dispatch_t *dispatch)
{
    int major, minor;
    const char *version = (const char *) dispatch->GetString (GL_SHADING_LANGUAGE_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);
}

int _cairo_gl_get_version (cairo_gl_dispatch_t *dispatch)
{
    int major, minor;
    const char *version = (const char *) dispatch->GetString (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 (cairo_gl_dispatch_t *dispatch)
{
    const char *version = (const char *) dispatch->GetString (GL_VERSION);
    cairo_gl_flavor_t flavor;

    if (version == NULL)
	flavor = CAIRO_GL_FLAVOR_NONE;
    else if (strstr (version, "OpenGL ES 2") != NULL)
	flavor = CAIRO_GL_FLAVOR_ES2;
    else if (strstr (version, "OpenGL ES 3") != NULL)
#if CAIRO_HAS_GLESV2_SURFACE
	flavor = CAIRO_GL_FLAVOR_ES2;
#elif CAIRO_HAS_GLESV3_SURFACE || CAIRO_HAS_EVASGL_SURFACE
	flavor = CAIRO_GL_FLAVOR_ES3;
#else
	flavor = CAIRO_GL_FLAVOR_NONE;
#endif
    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 (cairo_gl_dispatch_t *dispatch, const char *ext)
{
    int version = _cairo_gl_get_version (dispatch);
    if (version >= CAIRO_GL_VERSION_ENCODE (3, 0)) {
	GLint max_num_extensions;
	int i;
	dispatch->GetIntegerv (GL_NUM_EXTENSIONS, &max_num_extensions);

	for (i = 0; i < (int)max_num_extensions; i++) {
	    const char *extension = (const char *) dispatch->GetStringi (GL_EXTENSIONS, i);
	    if (strstr (extension, ext) != NULL)
		return TRUE;
	}
	return FALSE;
    } else {
	const char *extensions = (const char *) dispatch->GetString (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);
    }
}